[beagleboard] Re: BBB USB0 change from client to host
Hi Vince
Thanks for the suggestion. Issue was solved long ago but I didn't update the
post. But you are right with the use of inductors and you also need to change
the mode selection to out the port into host mode.
Kind Regards
Marc
Sent from my iPhone
On 9 Sep 2014, at 14:09, vincent.grenne...@gmail.com wrote:
Thanks Marc, these few lines are very useful since I need 2 USB hosts and
don't want to add a USB hub. About the supply, maybe adding inductor filters
like on USB1 schematic would be better.
Vince.
Le jeudi 17 avril 2014 12:01:27 UTC+2, marc...@gmail.com a écrit :
Hello
I have finally managed to get my hands on an BBB and started to try and get
my system up and running the way I need by building a kernel (3.14.1).
I am attempting to use the USB client port (USB0) in host mode and think I
have done all the things necessary to get this working:
Kernel config has EHCI enabled and set to host only
Hardware mod on the board to short pins 45 of micro socket to force USB-ID
low to indicate host mode.
Changed the arch/arm/boot/dts/am335x-bone-common.dtsi file to put it into
host mode
u...@47401000 {
status = okay;
dr_mode = host;
};
u...@47401800 {
status = okay;
dr_mode = host;
};
No matter what I plug in nothing gets identified ???
Plugging into the USB1 host port is fine so the kernel is configured
correctly.
Boot log shows ports being identified:
[2.057294] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
[2.063996] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned
bus number 1
[2.072673] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[2.079868] usb usb1: New USB device strings: Mfr=3, Product=2,
SerialNumber=1
[2.087467] usb usb1: Product: MUSB HDRC host driver
[2.092722] usb usb1: Manufacturer: Linux 3.14.1 musb-hcd
[2.098402] usb usb1: SerialNumber: musb-hdrc.0.auto
[2.104856] hub 1-0:1.0: USB hub found
[2.108880] hub 1-0:1.0: 1 port detected
[2.117574] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[2.124275] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned
bus number 2
[2.133045] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[2.140253] usb usb2: New USB device strings: Mfr=3, Product=2,
SerialNumber=1
[2.147851] usb usb2: Product: MUSB HDRC host driver
[2.153105] usb usb2: Manufacturer: Linux 3.14.1 musb-hcd
[2.158786] usb usb2: SerialNumber: musb-hdrc.1.auto
[2.165268] hub 2-0:1.0: USB hub found
[2.169312] hub 2-0:1.0: 1 port detected
Any ideas ???
Thanks
marc
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Re: [beagleboard] Re: registering asynchronous events on kernel thread in user space
Hi Brandon Thanks for the reply. I will summarize here what i found about controlling a GPIO and about using interrupts. 1. Using sysfs one can easily control the gpio and using threading can re-create pseudo-interrupt from user space. Found a useful project called libsoc https://github.com/jackmitch/libsoc. They use threading along with polling using poll(2) 2. Using mmap() one can import the memory space of the GPIO peripheral and with a combination of threads can re-create pseudo-interrupt from user space. Found useful project called BBBIOlib https://github.com/VegetableAvenger/BBBIOlib. 3. Using /dev/input/event for controlling GPIO from user space. 4. Using an LKM from kernel space where one can use request_irq() or request_threaded_irq() and using some kind of buffering to transfer the data to userspace. Here one will be writing actual interrupts. Some bits can be found here http://processors.wiki.ti.com/index.php/GPIO_Driver_Guide#Sysfs_entries_configuration I have very good idea about 1 and 2. I am still working on 3- /dev/input and also on 4- about writing a real ISR. Although the above methods enable GPIO control I am not sure which will give me the highest performance. I read that using mmap() method gives faster switching on forums and the using sysfs gives the slowest switching rate. I am not sure about /dev/input method. The LKM method gives faster ISR and i am guessing that LKM in combination with mmap() will give faster response timings. Any thoughts on the above... On Wednesday, September 10, 2014 8:20:18 AM UTC+5:30, Brandon I wrote: Before you jump into the kernel hole, is there a reason that you're not using the existing sysfs gpio interface ( https://www.kernel.org/doc/Documentation/gpio/sysfs.txt) for the interrupts? Using this, if you set the gpio up as an interrupt with the sysfs interface, you poll() the value file and it will block until there's an interrupt. When it unblocks, you can read the current value. Or, you can make the gpio look like an event/button: http://bec-systems.com/site/281/how-to-implement-an-interrupt-driven-gpio-input-in-linux Any sane way you do it will be the same at the low level. You'll have a read or ioctl function on the kernel device file that blocks in the kernel using a completion/semaphore, putting your process/thread to sleep. When the interrupt fires, the interrupt handler function is called to release the completion/semaphore, unblocking your process/thread and allowing it to continue executing. This unblocking is how the userspace program is signaled. So, if you *want* to reinvent the wheel, for understanding, then that's fine. But, there's an existing interface that exists, only a few lines of code away. --Brandon On Tue, Sep 9, 2014 at 7:10 PM, neo star prag@gmail.com javascript: wrote: Hi Brandon I read through the link, very informative thanks.I can create a thread to do the polling and signal me when its ready. But how to really write an ISR in arm. I see a lot of guides but they say that it will work in Intel processors but they are not sure about ARM. For sure from my readings i see that i need a kernel object to handle an ISR, But how to really do that. One example about how to handle interrupts is in http://stackoverflow.com/questions/15245626/simple-interrupt-handler-request-irq-returns-error-code-22 The other one is request_threaded_irq() as mentioned by Kavita in the above post. Is there any How to and guide to writing one. Any links. Thanks. On Wednesday, September 10, 2014 12:59:08 AM UTC+5:30, Brandon I wrote: See UIO: https://www.kernel.org/doc/htmldocs/uio-howto/ The uio_pruss.c driver that comes with the pru package is a good example. I have written a kernel module that registers interrupts on the rising edge on a GPIO pin and want to relay this message to user space. The sysfs gpio interface already does this. Check out the code. On Thursday, August 28, 2014 2:44:12 AM UTC-7, sid...@gmail.com wrote: I have read online that we can't handle interrupts from user space. Instead - 1) We can write a kernel thread and have that thread wait on an event. 2) Once the interrupt occurs, send one asynchronous event from the kernel module/driver to user space where we will have one signal handler with FASYNC to tackle this I have written a kernel module that registers interrupts on the rising edge on a GPIO pin and want to relay this message to user space. How do I go about implementing the above? Thanks! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to a topic in the Google Groups BeagleBoard group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/beagleboard/eNX0CU7-noE/unsubscribe. To unsubscribe from this group and all its topics, send an email to
[beagleboard] Re: Purchase original Beaglebone (white)
Just to not open a new post. Is the Beaglebone White discontinued? It is really hard to find any unit in stock. Thanks! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Purchase original Beaglebone (white)
Why you want one!? Black is a much better deal. I'll tell you what, buy me 2 Blacks and I'll give you a white ;) On Wed, Sep 10, 2014 at 5:27 AM, Edu Galvez edugalvez.eir...@gmail.com wrote: Just to not open a new post. Is the Beaglebone White discontinued? It is really hard to find any unit in stock. Thanks! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Beaglebone Black rev B - Embedded QT and X Sever - Deployment OS Ubuntu
I'm trying to get a good development system up and running for Beaglebone Black and Ubuntu. The goal is to launch an embedded GUI application on a LCD cape on boot. The application will control a hardware project and that is all it does. So it will be a special purpose device, not a general server. The hardware leverages the Linux OS for WiFi, Sound, Graphics. I'm open to using several development environments, QT, Mono, Java Swing... I am on a Beaglebone Black rev B, so I'm limited to 2gb storage. I'll need to have room for the application, so minimal size on the OS is needed. I tried to get a minimal system working with Ubuntu Trusty (14.04) following the instructions to get the custom kernel running and SGX drivers. I could get the SGX demos to work (evil morphing skull works great) but could not get the X server to work. The desktop would load, and show the login screen. Keyboard works, so I can log in. However, if I move the mouse, the system would freeze up solid. Reboot is the only option. I used a cross compiler machine to build QT applications. Console apps worked great. GUI failed. I could get the pre-compiled examples to work with LinuxFB (Fingerpaint) but my custom compiled GUI would not work. I dropped back to precise (12.04) and QT 4.8 X server works well for that version, but it is a bit slow. Loading the entire desktop allows me to run QT GUI programs. Now I'm trying to get a minimal X server QT build working. I don't need the desktop, just enough of X server to run QT applications. Has anyone been able to get a good minimal embedded QT environment to work? If so, did you do it using linux packages or compiling and installing source code? Did you end up installing the entire desktop or is there a minimum X server install that will run QT applications? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Linaro compiler tools for Angstrom
I need to rebuild my compiler tools for a set of BBB running a year old version of Angstrom. I have installed the latest version of the tools and discovered that there a number of changes that make it impossible to compile applications to run on the older Angstrom distribution including switching to hard floats and included libraries etc. I have tried using git to clone the source from the correct time period but can not get it to build correctly. Is there any way to download a distribution from the July 2013 time period that includes the correct setup tools. The Beaglebones are running: Linux version 3.8.13 (koen@rrMBP) (gcc version 4.7.3 2030205 (prerelease) Linaro GCC 4.7.2013.02-01 ) The functioning compiler tools are gcc version 4.7.3 20130105 (prerelease) ( Linaro GCC 4-7-4013.02-01) The non-functioning compiler tools are gcc version 4.8.3 20131202 (prerelease) (Linaro GCC 4.8-2013.12) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Purchase original Beaglebone (white)
Special Computing still stocks BBW https://specialcomp.com/Beagleboard/bone.htm On Sep 10, 2014 5:27 AM, Edu Galvez edugalvez.eir...@gmail.com wrote: Just to not open a new post. Is the Beaglebone White discontinued? It is really hard to find any unit in stock. Thanks! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] running Windows.Forms application on Mono runtime with Ubuntu OS
The problem is the mono runtime. It is not supported in Ubuntu 14.04. You might try Arch Arm Linux, it supports the mono runtime. I couldn't get the desktop to work on my beaglebone black rev b. I tried to get Debian Jessie to work. It supports the mono runtime. However, I couldn't get the desktop to work. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] QTE Creator and BBB
I had success getting QT creator to work using older versions. Ubuntu 12.04 (precise) works. You can load the console version, load the desktop (sudo apt-get install ubuntu-desktop). Use the software center to install QT Creator. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Accessing BeagleBoard features through Mono runtime on Ubuntu for C# development
What version of Ubuntu are you running? I believe 14.04 doesn't support mono. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Build a QT/11 application for beagleboard black by cross compiling from ubuntu
Hi Mirko, How did you get rid of the X server dependencies? I'm using QT Creator. Building a new QT application seems to require X server. On a headless version of Ubuntu 14.04 I can get the pre-compiled demos to work using -platform linuxfb However, my custom compiled code bombs out trying to start X server. Is there a special way to build the project to target linuxfb? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] u boot serial issue
Dear Robert, Is it possible to update eMMC in the same way as we do it for Nand. Like : read the MLO in ram address 0x8200 then from RAM we can write into eMMC. Please suggest interface used to do this. Putting into SD card partition and then flashing auto mode. Please suggest if I can use mmc erase blk count mmc write addr #blk count. Thanks Niraj On Sun, Aug 24, 2014 at 11:55 PM, Robert Nelson robertcnel...@gmail.com wrote: On Sun, Aug 24, 2014 at 9:02 AM, Niraj Kumar jhanira...@googlemail.com wrote: Hi, I am able to boot uboot. I can see uboot report No NAND device but suppose to be 2GB NAND device the Rev B boards? NAND =/= eMMC.. The RevB boards are shipped with 2GB of eMMC.. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to a topic in the Google Groups BeagleBoard group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/beagleboard/QAzmdicMeo0/unsubscribe. To unsubscribe from this group and all its topics, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] u boot serial issue
On Wed, Sep 10, 2014 at 9:33 AM, Niraj Kumar jhanira...@googlemail.com wrote: Dear Robert, Is it possible to update eMMC in the same way as we do it for Nand. Like : read the MLO in ram address 0x8200 then from RAM we can write into eMMC. Please suggest interface used to do this. Putting into SD card partition and then flashing auto mode. Please suggest if I can use mmc erase blk count mmc write addr #blk count. Maybe... Give it a shot and let us know. I only use rsync as i know it works and it's fast.. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Java on BBB
Hi Conrad, Did you get Java working on BBB? I have a BBB rev B. How big is your deployment image? Will it fit in the 2gb space? I'm curious if I develop an swing java application in Windows using IntelliJ if it will run on the BBB. Do you have to develop you applications on the BBB for it to work? Does it require X Server or are there embedded options for GUI applications? Just a few simple questions. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Build a QT/11 application for beagleboard black by cross compiling from ubuntu
That could be very cool if you could create a qt toolchain for debian ;) Micka, On Thu, Feb 6, 2014 at 9:16 PM, Louis McCarthy compeo...@gmail.com wrote: Not to plug my own site, but I give very detailed instructions on my blog post, which should guide you through what to download and what files to put where. http://armsdr.blogspot.com/2014/01/bare-metal-qt-52-on-beaglebone-black_10.html The Angstrom toolkit already included qmake, but because we need hf, you have to build qmake with a cross-compiler (I recommend Linaro). That is why you need to install the qt-everywhere source. I am exploring the creation of a toolchain, for Debian, much like Angstrom had.just too many other fires right now On Thu, Feb 6, 2014 at 1:34 PM, Micka mickamus...@gmail.com wrote: Thx, But are you working with the image from Robert nelson ( ubuntu ) . And what do you want me to do with the qt-everywhere opensource src folder ? micka, On Thu, Feb 6, 2014 at 7:53 PM, Tux Leonard tuxl...@gmail.com wrote: Hi Micka, I shared the toolchain I use and qt sources with you. This combination works on my BBB. Roy 2014-02-06 Micka mickamus...@gmail.com: Thx I didn't see that But It means also that I can't use the toolchains qt from angstrom because it's compiled withOUT the hf . does someone know how to cross compile qt ? I don't need a full explanation just a little explanation . Any idea ? On Thu, Feb 6, 2014 at 5:49 PM, Micka mickamus...@gmail.com wrote: Thx I didn't see that But It means also that I can't use the toolchains qt from angstrom because it's compiled with the hf . does someone know how to cross compile qt ? I don't need a full explanation just a little explanation . Any idea ? On Thu, Feb 6, 2014 at 3:20 PM, Robert Nelson robertcnel...@gmail.com wrote: ubuntu@arm:~$ qmake -version QMake version 2.01a Using Qt version 4.8.4 in /usr/lib/arm-linux-gnueabihf the gcc that i'm using is here : /usr/bin/arm-linux-gnueabi-g++ Your using ubuntu armhf yet building the appplication with a gnueabi based compiler.. armhf uses this linker: /lib/ld-linux-armhf.so.3 armel/gnueabi uses this linker: /lib/ld-linux.so.3 Use the correct gnueabi*hf* toolchain.. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to a topic in the Google Groups BeagleBoard group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/beagleboard/mb1R6NF5RH4/unsubscribe. To unsubscribe from this group and all its topics, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- “If we can prevent the government from wasting the labors of the people, under the pretense of taking care of them, they must become happy. - Thomas Jefferson -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] CAN bus recovery
I have noticed that if I short CAN_H and CAN_L together, or if there is noise on the bus, the BeagleBone will stop sending and receiving CAN messages. When this happens, if I execute ifconfig can0 down and ifconfig can0 up, things start working again. Is there a way to detect this automatically and recover? I'm using SocketCAN, but haven't found anything that would tell me when I get a bus off or bus heavy. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Purchase original Beaglebone (white)
If a distributor places and order we will ship them boards. We will not make these boards and ship them without an order. As you can see, Special Computing placed and order, we made them, and then we shipped them. Gerald On Wed, Sep 10, 2014 at 8:29 AM, Special Computing specialc...@gmail.com wrote: Special Computing still stocks BBW https://specialcomp.com/Beagleboard/bone.htm On Sep 10, 2014 5:27 AM, Edu Galvez edugalvez.eir...@gmail.com wrote: Just to not open a new post. Is the Beaglebone White discontinued? It is really hard to find any unit in stock. Thanks! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] how read I2C
thanks for reply
I try this
*root@beaglebone:~# i2cset -y 1 0x49 0x01 0x60root@beaglebone:~# i2cget -y
1 0x49 0x00 0xb016*
i thinks is correctly,
now i would like in node js
I try this
*var b=require('bonescript');var
port='/dev/i2c-1';b.i2cOpen(port,0x49,{});b.i2cWriteBytes(port,0x01,0x60);r
=b.i2cReadBytes(port,0x00,2);console.log(r);*
in the console show this result
Buffer 38 70
But now is not the same
*0xb016*How i can do ?
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[beagleboard] how convert command I2Cset and I2Cget to bonescript
Hi all, I read data I2C with this commande *root@beaglebone:~# i2cset -y 1 0x49 0x01 0x60* *root@beaglebone:~# i2cget -y 1 0x49 0x00 w * *0x2017* How i can do for translate to bonescript ? thank's for a lot for reply and help. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Cape battery charging
Thanks Gerald. I have found a couple of good tutorials also about compatible battery types. Sam. On Wednesday, 10 September 2014 05:39:57 UTC+10, Gerald wrote: I suggest that you read the data sheet for the TPS65217 device before you connect a battery to it. It is designed to charge certain types of batteries, but you need to understand the limitations and requirements of doing so before you do so. A peak at the schematic would also be advisable as well as reading the System Reference Manual. http://www.elinux.org/Beagleboard:BeagleBoneBlack Gerald On Tue, Sep 9, 2014 at 2:07 PM, samthoma...@gmail.com javascript: wrote: Hey Guys, I want to make up my own cape. I just need to know if I power the Bbb through Vdd_5v if it will charge a lipo attached to the battery header on the board. Cheers. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Boards abilities
As I look at the Beaglebone, Raspberry Pi, etc, I see the possibility of using this small platform to carry curricula. Would like input on the Beagleboard Black and the Beagleboard. I have been developing Special Education curricula over the past decade, and have the idea of placing everything I've developed onto a board for a student to use independently. My thought was to have a Linux operating system preloaded with all the curricula, PDFs, html, videos, etc. The student would simply have a plug and play access to all the resources on the board. I would like some feedback from users if the platforms could support this idea. I have the very little knowledge in this area and looking to learn. Any input on function, Pros and Cons of each board If this is feasible I would prototype for beta within 1 month and demo in October. Thanks, Ken -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] how read I2C
thans's i try this root@beaglebone:~# i2cset -y 1 0x49 0x01 0x60 root@beaglebone:~# i2cget -y 1 0x49 0x00 w 0x3016 root@beaglebone:~# how use this the commande console same with bonescript ? Le lundi 8 septembre 2014 19:28:59 UTC+2, sbodd05 a écrit : The above command scans the i2c-1 bus and reports the device address attached to it. In this case 0x54, 0x55, 0x56 and 0x57 are the device addresses, which are EEPROMs. The UU indicates, the address is already occupied by some driver. You can check the p9_20 (I2C2_SDA) for sent data and ack replied back by devices in a oscilloscope, and p9_19 (I2C2_SCL) for i2c clock source. For better understanding regarding the i2c-tools follow the below mentioned link - http://www.lm-sensors.org/wiki/i2cToolsDocumentation Thanks, S.B. On Sun, Sep 7, 2014 at 1:39 PM, keo@gmail.com javascript: wrote: Hi all, I would like use I2C, but l'm newbie i throw this i2cdetect -y -r 1 this is response 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- How read this response ? What we need for read the componement if I mesure P9_19 and P9_20 i have a signal when i throw commande thianks for help :) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Boards abilities
There are more than a few comparison articles online. Some I've bookmarked in my journey are: http://makezine.com/magazine/how-to-choose-the-right-platform-raspberry-pi-or-beaglebone-black/ http://www.doctormonk.com/2013/07/raspberry-pi-vs-beaglebone-black.html http://lifehacker.com/how-to-pick-the-right-electronics-board-for-your-diy-pr-742869540 Based on your criteria, either board will work fine. Note that BBB is truly plug-and-play while the Raspberry Pi requires some (minimal) setup preparation. On Wednesday, September 10, 2014 9:17:14 AM UTC-7, kev...@havenschools.com wrote: As I look at the Beaglebone, Raspberry Pi, etc, I see the possibility of using this small platform to carry curricula. Would like input on the Beagleboard Black and the Beagleboard. I have been developing Special Education curricula over the past decade, and have the idea of placing everything I've developed onto a board for a student to use independently. My thought was to have a Linux operating system preloaded with all the curricula, PDFs, html, videos, etc. The student would simply have a plug and play access to all the resources on the board. I would like some feedback from users if the platforms could support this idea. I have the very little knowledge in this area and looking to learn. Any input on function, Pros and Cons of each board If this is feasible I would prototype for beta within 1 month and demo in October. Thanks, Ken -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Needed BEAGLEBONE WL1835MOD W/ CHIP ANTENNA
We have been looking for the BEAGLEBONE WL1835MOD W/ CHIP ANTENNA for sometime now without results. Does anyone have a few extra they would be willing to sell and ship to us? Thanks Coy -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Needed BEAGLEBONE WL1835MOD W/ CHIP ANTENNA
On Wed, Sep 10, 2014 at 2:01 PM, Waxengecko coychrist...@gmail.com wrote: WL1835MOD W/ CHIP ANTEN Is building some yourself out of the question? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Beaglebone Blacks that suddenly die.
I have four Beaglebone Blacks that have died. They all exhibit the same behavior. When the power is applied the Power LED flashes on then off. Each time power is applied this short sequence repeats. My first guess is that the power conditioning circuit is failing to produce/receive a power good signal. My question is: Have others experience the same issue? Is there a path to resurrect these four boards? Thanks. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: kernel source for bbb-exp-c
Can i build Yocto with this kernel? Thanks Wesu Am Sonntag, 31. August 2014 16:56:29 UTC+2 schrieb Bradley Matusiak: i ordered the BBB-EXP-C and it came with the DVD of software.. i pulled out the kernel and posted on github for a reference https://github.com/bmatusiak/bbb-exp-lcd7 -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Blacks that suddenly die.
http://www.elinux.org/Beagleboard:BeagleBoneBlack#Improper_Power_DownAll_Revisions Gerald On Wed, Sep 10, 2014 at 1:35 PM, ursus.mars...@gmail.com wrote: I have four Beaglebone Blacks that have died. They all exhibit the same behavior. When the power is applied the Power LED flashes on then off. Each time power is applied this short sequence repeats. My first guess is that the power conditioning circuit is failing to produce/receive a power good signal. My question is: Have others experience the same issue? Is there a path to resurrect these four boards? Thanks. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: registering asynchronous events on kernel thread in user space
From: neo prag.in...@gmail.com Reply-To: beagleboard@googlegroups.com beagleboard@googlegroups.com Date: Wednesday, September 10, 2014 at 5:13 AM To: beagleboard@googlegroups.com beagleboard@googlegroups.com Subject: Re: [beagleboard] Re: registering asynchronous events on kernel thread in user space Hi Brandon Thanks for the reply. I will summarize here what i found about controlling a GPIO and about using interrupts. 1. Using sysfs one can easily control the gpio and using threading can re-create pseudo-interrupt from user space. Found a useful project called libsoc https://github.com/jackmitch/libsoc. They use threading along with polling using poll(2) 2. Using mmap() one can import the memory space of the GPIO peripheral and with a combination of threads can re-create pseudo-interrupt from user space. Found useful project called BBBIOlib https://github.com/VegetableAvenger/BBBIOlib. 3. Using /dev/input/event for controlling GPIO from user space. 4. Using an LKM from kernel space where one can use request_irq() or request_threaded_irq() and using some kind of buffering to transfer the data to userspace. Here one will be writing actual interrupts. Some bits can be found here http://processors.wiki.ti.com/index.php/GPIO_Driver_Guide#Sysfs_entries_config uration I have very good idea about 1 and 2. I am still working on 3- /dev/input and also on 4- about writing a real ISR. Although the above methods enable GPIO control I am not sure which will give me the highest performance. I read that using mmap() method gives faster switching on forums and the using sysfs gives the slowest switching rate. I am not sure about /dev/input method. The LKM method gives faster ISR and i am guessing that LKM in combination with mmap() will give faster response timings. Any thoughts on the above... You are on the right path. One thing to remember, whenever you are doing any I/O from user space, you are dealing with context switching and thread scheduling, which means that your application won¹t respond to a GPIO event for anywhere from a few ms to 100mS. This is true because of both the interrupt latency in Linux and thread scheduler. In most cases, this is fine, because the user doesn¹t know the difference. However, if you are attempting to do some sort of control, then you may want to consider the PRU. The PRU can still send events to your user space app. Another solution might be Xenomai which reduces to interrupt latency to about 50uS on the BBB, but you still have the context switch delay. Regards, John On Wednesday, September 10, 2014 8:20:18 AM UTC+5:30, Brandon I wrote: Before you jump into the kernel hole, is there a reason that you're not using the existing sysfs gpio interface (https://www.kernel.org/doc/Documentation/gpio/sysfs.txt) for the interrupts? Using this, if you set the gpio up as an interrupt with the sysfs interface, you poll() the value file and it will block until there's an interrupt. When it unblocks, you can read the current value. Or, you can make the gpio look like an event/button: http://bec-systems.com/site/281/how-to-implement-an-interrupt-driven-gpio-inp ut-in-linux Any sane way you do it will be the same at the low level. You'll have a read or ioctl function on the kernel device file that blocks in the kernel using a completion/semaphore, putting your process/thread to sleep. When the interrupt fires, the interrupt handler function is called to release the completion/semaphore, unblocking your process/thread and allowing it to continue executing. This unblocking is how the userspace program is signaled. So, if you *want* to reinvent the wheel, for understanding, then that's fine. But, there's an existing interface that exists, only a few lines of code away. --Brandon On Tue, Sep 9, 2014 at 7:10 PM, neo star prag@gmail.com javascript: wrote: Hi Brandon I read through the link, very informative thanks.I can create a thread to do the polling and signal me when its ready. But how to really write an ISR in arm. I see a lot of guides but they say that it will work in Intel processors but they are not sure about ARM. For sure from my readings i see that i need a kernel object to handle an ISR, But how to really do that. One example about how to handle interrupts is in http://stackoverflow.com/questions/15245626/simple-interrupt-handler-request -irq-returns-error-code-22 The other one is request_threaded_irq() as mentioned by Kavita in the above post. Is there any How to and guide to writing one. Any links. Thanks. On Wednesday, September 10, 2014 12:59:08 AM UTC+5:30, Brandon I wrote: See UIO: https://www.kernel.org/doc/htmldocs/uio-howto/ https://www.kernel.org/doc/htmldocs/uio-howto/ The uio_pruss.c driver that comes with the pru package is a good example. I have written a kernel module that registers interrupts on the rising edge on a GPIO pin and want to relay this message
Re: [beagleboard] Beaglebone Black rev B - Embedded QT and X Sever - Deployment OS Ubuntu
On 9/10/14, 6:15 AM, Peter Gregory talkto...@gmail.com wrote: I'm trying to get a good development system up and running for Beaglebone Black and Ubuntu. The goal is to launch an embedded GUI application on a LCD cape on boot. The application will control a hardware project and that is all it does. So it will be a special purpose device, not a general server. The hardware leverages the Linux OS for WiFi, Sound, Graphics. I'm open to using several development environments, QT, Mono, Java Swing... I am on a Beaglebone Black rev B, so I'm limited to 2gb storage. I'll need to have room for the application, so minimal size on the OS is needed. I tried to get a minimal system working with Ubuntu Trusty (14.04) following the instructions to get the custom kernel running and SGX drivers. I could get the SGX demos to work (evil morphing skull works great) but could not get the X server to work. If you read the SGX release notes, Xorg is not supported. http://processors.wiki.ti.com/index.php/RN_5_01_01_01#What_is_not_supported TI are going to support wayland instead. Regards, John The desktop would load, and show the login screen. Keyboard works, so I can log in. However, if I move the mouse, the system would freeze up solid. Reboot is the only option. I used a cross compiler machine to build QT applications. Console apps worked great. GUI failed. I could get the pre-compiled examples to work with LinuxFB (Fingerpaint) but my custom compiled GUI would not work. I dropped back to precise (12.04) and QT 4.8 X server works well for that version, but it is a bit slow. Loading the entire desktop allows me to run QT GUI programs. Now I'm trying to get a minimal X server QT build working. I don't need the desktop, just enough of X server to run QT applications. Has anyone been able to get a good minimal embedded QT environment to work? If so, did you do it using linux packages or compiling and installing source code? Did you end up installing the entire desktop or is there a minimum X server install that will run QT applications? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Blacks that suddenly die.
I would be interested in the outcome of this investigation. We are using the bbb in a commercial setting, through CircuitCo, and I'm not sure what the power down ramp will look like. It is possible (and likely) that the voltage falloff will be slow compared to a quick unplug, but our devices power up and down relatively frequently. Any guidance on this would be appreciated. Chris On Wed, Sep 10, 2014 at 3:17 PM, Gerald Coley ger...@beagleboard.org wrote: http://www.elinux.org/Beagleboard:BeagleBoneBlack#Improper_Power_DownAll_Revisions Gerald On Wed, Sep 10, 2014 at 1:35 PM, ursus.mars...@gmail.com wrote: I have four Beaglebone Blacks that have died. They all exhibit the same behavior. When the power is applied the Power LED flashes on then off. Each time power is applied this short sequence repeats. My first guess is that the power conditioning circuit is failing to produce/receive a power good signal. My question is: Have others experience the same issue? Is there a path to resurrect these four boards? Thanks. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Blacks that suddenly die.
I am working on this in my spare time. Basic concept is that you need enough power after you pull power to give the PMIC time to ramp the voltage rails down in order so as not to violate the specification of the processor.. Best idea so far is a super cap on the battery connections. That would require SW to start the shutdown process once power was detected as being removed. I am trying to find a way to do this that won't add too much cost and that does not rely on the SW to start the shutdown process.. Gerald On Wed, Sep 10, 2014 at 2:34 PM, Chris Morgan chmor...@gmail.com wrote: I would be interested in the outcome of this investigation. We are using the bbb in a commercial setting, through CircuitCo, and I'm not sure what the power down ramp will look like. It is possible (and likely) that the voltage falloff will be slow compared to a quick unplug, but our devices power up and down relatively frequently. Any guidance on this would be appreciated. Chris On Wed, Sep 10, 2014 at 3:17 PM, Gerald Coley ger...@beagleboard.org wrote: http://www.elinux.org/Beagleboard:BeagleBoneBlack#Improper_Power_DownAll_Revisions Gerald On Wed, Sep 10, 2014 at 1:35 PM, ursus.mars...@gmail.com wrote: I have four Beaglebone Blacks that have died. They all exhibit the same behavior. When the power is applied the Power LED flashes on then off. Each time power is applied this short sequence repeats. My first guess is that the power conditioning circuit is failing to produce/receive a power good signal. My question is: Have others experience the same issue? Is there a path to resurrect these four boards? Thanks. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Blacks that suddenly die.
Gerald, hey question: This design you're working on will not stand in the way of us users doing our own thing. Will it ? I'm assuming you'd be implementing this into the next revision, or even board, but . . . Yeah assumptions . . . On Wed, Sep 10, 2014 at 12:45 PM, Gerald Coley ger...@beagleboard.org wrote: I am working on this in my spare time. Basic concept is that you need enough power after you pull power to give the PMIC time to ramp the voltage rails down in order so as not to violate the specification of the processor.. Best idea so far is a super cap on the battery connections. That would require SW to start the shutdown process once power was detected as being removed. I am trying to find a way to do this that won't add too much cost and that does not rely on the SW to start the shutdown process.. Gerald On Wed, Sep 10, 2014 at 2:34 PM, Chris Morgan chmor...@gmail.com wrote: I would be interested in the outcome of this investigation. We are using the bbb in a commercial setting, through CircuitCo, and I'm not sure what the power down ramp will look like. It is possible (and likely) that the voltage falloff will be slow compared to a quick unplug, but our devices power up and down relatively frequently. Any guidance on this would be appreciated. Chris On Wed, Sep 10, 2014 at 3:17 PM, Gerald Coley ger...@beagleboard.org wrote: http://www.elinux.org/Beagleboard:BeagleBoneBlack#Improper_Power_DownAll_Revisions Gerald On Wed, Sep 10, 2014 at 1:35 PM, ursus.mars...@gmail.com wrote: I have four Beaglebone Blacks that have died. They all exhibit the same behavior. When the power is applied the Power LED flashes on then off. Each time power is applied this short sequence repeats. My first guess is that the power conditioning circuit is failing to produce/receive a power good signal. My question is: Have others experience the same issue? Is there a path to resurrect these four boards? Thanks. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Black rev B - Embedded QT and X Sever - Deployment OS Ubuntu
Wayland! That's what I was missing. I was installing ubuntu-desktop. Looks like I'll be flashing a new image tonight and giving it a try. Thanks! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Boards abilities
Raspberry PI Pro's Graphics. Beagelbone Black Pro's Everything else. Technically, as what is in the reference material, the rPI is supposed to use less power too. However, according to the documents I've read, this does not include the power used by the graphics. Which can be quite substantial. About the graphics, it is very good on paper, and in real world usage. So if you intend to use video, graphics, maybe even play games ( does not sound like it ), the rPI is the way to go. I've also read that the rPI is supposed to have a faster sd card implementation, but I can not confirm that personally. I'd say the major pro's for the Beaglebone Black would have to be processor speed, and availability( at a reasonable cost ). That is for your use case. Also, setup time is nearly non existent when compared to the rPI. Since the OS comes pre-installed. I've read that you *can* buy pre-installed whatever sd cards for the PI, but that's an added cost. On Wed, Sep 10, 2014 at 11:25 AM, Michael M mmcdani...@gmail.com wrote: There are more than a few comparison articles online. Some I've bookmarked in my journey are: http://makezine.com/magazine/how-to-choose-the-right-platform-raspberry-pi-or-beaglebone-black/ http://www.doctormonk.com/2013/07/raspberry-pi-vs-beaglebone-black.html http://lifehacker.com/how-to-pick-the-right-electronics-board-for-your-diy-pr-742869540 Based on your criteria, either board will work fine. Note that BBB is truly plug-and-play while the Raspberry Pi requires some (minimal) setup preparation. On Wednesday, September 10, 2014 9:17:14 AM UTC-7, kev...@havenschools.com wrote: As I look at the Beaglebone, Raspberry Pi, etc, I see the possibility of using this small platform to carry curricula. Would like input on the Beagleboard Black and the Beagleboard. I have been developing Special Education curricula over the past decade, and have the idea of placing everything I've developed onto a board for a student to use independently. My thought was to have a Linux operating system preloaded with all the curricula, PDFs, html, videos, etc. The student would simply have a plug and play access to all the resources on the board. I would like some feedback from users if the platforms could support this idea. I have the very little knowledge in this area and looking to learn. Any input on function, Pros and Cons of each board If this is feasible I would prototype for beta within 1 month and demo in October. Thanks, Ken -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Boards abilities
I should mention that the rPI's graphics are nearly or exactly impossible to disable the graphics chip. SO that additional power that is not counted in the power usage benchmarks will always be used. On Wed, Sep 10, 2014 at 1:30 PM, William Hermans yyrk...@gmail.com wrote: Raspberry PI Pro's Graphics. Beagelbone Black Pro's Everything else. Technically, as what is in the reference material, the rPI is supposed to use less power too. However, according to the documents I've read, this does not include the power used by the graphics. Which can be quite substantial. About the graphics, it is very good on paper, and in real world usage. So if you intend to use video, graphics, maybe even play games ( does not sound like it ), the rPI is the way to go. I've also read that the rPI is supposed to have a faster sd card implementation, but I can not confirm that personally. I'd say the major pro's for the Beaglebone Black would have to be processor speed, and availability( at a reasonable cost ). That is for your use case. Also, setup time is nearly non existent when compared to the rPI. Since the OS comes pre-installed. I've read that you *can* buy pre-installed whatever sd cards for the PI, but that's an added cost. On Wed, Sep 10, 2014 at 11:25 AM, Michael M mmcdani...@gmail.com wrote: There are more than a few comparison articles online. Some I've bookmarked in my journey are: http://makezine.com/magazine/how-to-choose-the-right-platform-raspberry-pi-or-beaglebone-black/ http://www.doctormonk.com/2013/07/raspberry-pi-vs-beaglebone-black.html http://lifehacker.com/how-to-pick-the-right-electronics-board-for-your-diy-pr-742869540 Based on your criteria, either board will work fine. Note that BBB is truly plug-and-play while the Raspberry Pi requires some (minimal) setup preparation. On Wednesday, September 10, 2014 9:17:14 AM UTC-7, kev...@havenschools.com wrote: As I look at the Beaglebone, Raspberry Pi, etc, I see the possibility of using this small platform to carry curricula. Would like input on the Beagleboard Black and the Beagleboard. I have been developing Special Education curricula over the past decade, and have the idea of placing everything I've developed onto a board for a student to use independently. My thought was to have a Linux operating system preloaded with all the curricula, PDFs, html, videos, etc. The student would simply have a plug and play access to all the resources on the board. I would like some feedback from users if the platforms could support this idea. I have the very little knowledge in this area and looking to learn. Any input on function, Pros and Cons of each board If this is feasible I would prototype for beta within 1 month and demo in October. Thanks, Ken -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Black rev B - Embedded QT and X Sever - Deployment OS Ubuntu
On 9/10/14, 1:10 PM, Peter Gregory talkto...@gmail.com wrote: Wayland! That's what I was missing. I was installing ubuntu-desktop. Looks like I'll be flashing a new image tonight and giving it a try. Thanks! From QT, you need qtwayland. Regards, John -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Fail over to USB power when disconnecting AC power supply
When disconnecting the AC power supply while also connected via USB the BBB is doing a soft shutdown. I used acpid_listen with acpid.service stopped to see the event it's generating and it is registering it as button/power PBTN 0080 which is the same event as the power button press. How can I make it register a different event so that I can fail over to USB or battery? I am getting the values correctly from the TPS65217C to detect AC or USB power so detection is not the issue. Using: acpid-2.0.23 RCN's Debian Jessie-bone64 -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: registering asynchronous events on kernel thread in user space
pseudo-interrupt from user space There's nothing pseudo about it. Again, any usual way to have a userspace application respond to an interrupt will be the exact same. The kernel will block the userspace process until the interrupt is seen. The only real alternative is burning up the cpu with memory polling, which appears to be what the BBIOlib method uses. So, your latency is limited to your poll speed (which can be faster than interrupts). But, if you have a constant poll for minimum latency, lets hope you're not trying to do something important elsewhere since your cpu usage will be at 100%, and you'll be maximizing process to process context switching! For 4, The only difference between a userspace and kernel space interrupt handler is where the code is that responds to the interrupt. You will only benefit from writing your own interrupt handler if you put all of your code that does something with that interrupt in the kernel. Otherwise, you're back to process blocked by kernel, interrupt occurs, kernel unblocks process, process does something after seeing the interruptback to the sysfs/UIO method. I would try some benchmarks. See if the regular UIO/sysfs interrupt method gives you sufficient performance. And definitely keep in mind John's statement. You're going to see a massive amount of jitter for anything in userspace or kernel space (better jitter since you can disable interrupts and whatnot, but if you don't finish quickly in kernel space, you'll crash the kernel). If something like a precise timestamp is needed for an async event, then there are other ways to approach this. If you're looking for fixed low latency, you're doomed. On Wed, Sep 10, 2014 at 5:13 AM, neo prag.in...@gmail.com wrote: pseudo-interrupt from user space -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: registering asynchronous events on kernel thread in user space
From: Brandon I brandon.ir...@gmail.com Reply-To: beagleboard@googlegroups.com beagleboard@googlegroups.com Date: Wednesday, September 10, 2014 at 1:55 PM To: beagleboard@googlegroups.com beagleboard@googlegroups.com Subject: Re: [beagleboard] Re: registering asynchronous events on kernel thread in user space pseudo-interrupt from user space There's nothing pseudo about it. Again, any usual way to have a userspace application respond to an interrupt will be the exact same. The kernel will block the userspace process until the interrupt is seen. The only real alternative is burning up the cpu with memory polling, which appears to be what the BBIOlib method uses. So, your latency is limited to your poll speed (which can be faster than interrupts). But, if you have a constant poll for minimum latency, lets hope you're not trying to do something important elsewhere since your cpu usage will be at 100%, and you'll be maximizing process to process context switching! For 4, The only difference between a userspace and kernel space interrupt handler is where the code is that responds to the interrupt. You will only benefit from writing your own interrupt handler if you put all of your code that does something with that interrupt in the kernel. Otherwise, you're back to process blocked by kernel, interrupt occurs, kernel unblocks process, process does something after seeing the interruptback to the sysfs/UIO method. I would try some benchmarks. See if the regular UIO/sysfs interrupt method gives you sufficient performance. And definitely keep in mind John's statement. You're going to see a massive amount of jitter for anything in userspace or kernel space (better jitter since you can disable interrupts and whatnot, but if you don't finish quickly in kernel space, you'll crash the kernel). If something like a precise timestamp is needed for an async event, then there are other ways to approach this. If you're looking for fixed low latency, you're doomed. I agree with everything Brandon just articulated. Regards, John On Wed, Sep 10, 2014 at 5:13 AM, neo prag.in...@gmail.com wrote: pseudo-interrupt from user space -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Needed BEAGLEBONE WL1835MOD W/ CHIP ANTENNA
We can but we are on a pretty tight line. On Wednesday, September 10, 2014 2:14:21 PM UTC-5, Bill Traynor wrote: On Wed, Sep 10, 2014 at 2:01 PM, Waxengecko coychr...@gmail.com javascript: wrote: WL1835MOD W/ CHIP ANTEN Is building some yourself out of the question? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Kernel 3.15.10 bone 8 + 4D LCD7 cape failed on BBB
Hi all, First thanks to Robert and other contributors for having put dts files for the capes in the kernel tree. I've been away from BBB those last weeks because of work, and back on it after having played a bit with Qt5, opengl, pruss and ldc4 cape... I found out my fingers are way too big for the 4.3 screen, in fact I have too many buttons and text for my application. So I bought a 4D LCD7 cape, pulled the new kernel 3.15 and built it. I disabled HDMI, added the include for the cape, tried to boot and nothing on screen. Backlight is on, screen initialize but on the console I have: tilcdc 4830e000.fb: timeout waiting for framedone. LCD4 from circuitco is fine with kernel built the same way, and LCD7 is working fine under 3.8.13 base image on emmc. I did not had time to investigate any further because it was almost time to get the kids at school, but I'll check more in depth tomorrow. But if anyone went across this kind of trouble and fixed it, would be glad to hear what has been done. Regards, Cedric -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] BeagleBone Black switching to 3.14 kernel
Thanks for posting, I'll try that ;) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Having trouble calibrating LCD7 with no XDM
Ok, topic is a few weks old but if you're still stuck on this... You should read this : http://embedded.von-kannen.net/2014/05/21/qt-4-8-6-on-beaglebone-black/ I use tslib for touchscreen under Qt4, and you can calibrate the screen with ts_calibrate and then use the touchscreen for qt apps. I came across another problem, being the pressure needed on the screen, but that's something todo on my list. Under qt5 there's evdevtouchscreen wich is also working. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Start QT Application on bootup on Beaglebone Black
You've accomplished more than I've managed to do. Could you suggest some references I could check so I can figure out what silly mistakes I'm making? Cheers, Tim On Tuesday, September 9, 2014 3:57:58 AM UTC-4, Mickae1 wrote: you should switch to debian, you will have more help from the Debian community . I've a BBB under debian which start QT at bootup ! Micka, Le dimanche 7 septembre 2014 14:03:35 UTC+2, Mahendra Gunawardena a écrit : Below is picture of the display on bootup. Expected display output is overwritten by Angstrom screen https://lh6.googleusercontent.com/-0ZA2QPRpNi8/VAxGxNd11yI/ABs/lvJbktseYgY/s1600/IMG_3852.JPG Expected Display output https://lh4.googleusercontent.com/-6jEzdpYTOQ0/VAxG86ZQFzI/AB0/LcFlyIPkwfE/s1600/IMG_3853.JPG The expected display output briefly appears but is overwritten by the Angstrom text based image. But occasionally the expected display appears. Then the dynamic widgets update the screen but the static information is not visible. The issues appears to be timing, and if the BBB can be forced to start the QT application after complete bootup of BBB that would suffices the current needs. Application is been started as a service. Below is the content of the service file [Unit] Description=QTAccelerometer GUI After=systemd-user-sessions.service [Service] WorkingDirectory=/home/root/projects/qt-projects ExecStart=/home/root/projects/qt-projects/QTAccelerometer -qws SyslogIdentifier=QTAccelerometer Restart=on-failure RestartSec=5 [Install] Alias=display-manager.service Below are the other options tried without success [Install] WantedBy=multi-user.target WantedBy=graphical.target *References* - Creating Ångström System Services on BeagleBone Black http://mattrichardson.com/BeagleBone-System-Services/ I have also posted this question on Stackoverflow http://stackoverflow.com/questions/25701662/start-qt-application-on-bootup-on-an-embedded-linux-device-beaglebone-black . Thank you in advance Mahen -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBone Black switching to 3.14 kernel
So, at this point in time. What can we expect that is better with 3.14 versus 3.8 ? I do not personally have a problem using #include for various capes if need be, but I am wondering if USB hotplug, and / or if USB support is better. As was with 3.15. On Wed, Sep 10, 2014 at 5:42 PM, Cedric Malitte cedric.mali...@gmail.com wrote: Thanks for posting, I'll try that ;) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Kernel 3.15.10 bone 8 + 4D LCD7 cape failed on BBB
On Wed, Sep 10, 2014 at 7:36 PM, Cedric Malitte cedric.mali...@gmail.com wrote: Hi all, First thanks to Robert and other contributors for having put dts files for the capes in the kernel tree. I've been away from BBB those last weeks because of work, and back on it after having played a bit with Qt5, opengl, pruss and ldc4 cape... I found out my fingers are way too big for the 4.3 screen, in fact I have too many buttons and text for my application. So I bought a 4D LCD7 cape, pulled the new kernel 3.15 and built it. I disabled HDMI, added the include for the cape, tried to boot and nothing on screen. Backlight is on, screen initialize but on the console I have: tilcdc 4830e000.fb: timeout waiting for framedone. LCD4 from circuitco is fine with kernel built the same way, and LCD7 is working fine under 3.8.13 base image on emmc. I did not had time to investigate any further because it was almost time to get the kids at school, but I'll check more in depth tomorrow. But if anyone went across this kind of trouble and fixed it, would be glad to hear what has been done. Which version of the lcd7 is it? on v3.8.x dmesg | grep cape will tell us everything. (revision etc..) Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBone Black switching to 3.14 kernel
On Wed, Sep 10, 2014 at 8:02 PM, William Hermans yyrk...@gmail.com wrote: So, at this point in time. What can we expect that is better with 3.14 versus 3.8 ? I do not personally have a problem using #include for various capes if need be, but I am wondering if USB hotplug, and / or if USB support is better. As was with 3.15. usb/ethernet/pm is better. Right now we are integrating Charles's universal pinmux, which will allow you to 'mux' enabled peripherals on the fly. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBone Black switching to 3.14 kernel
Thanks Robert. pm == power management ? If so how is it better ? On Wed, Sep 10, 2014 at 6:31 PM, Robert Nelson robertcnel...@gmail.com wrote: On Wed, Sep 10, 2014 at 8:02 PM, William Hermans yyrk...@gmail.com wrote: So, at this point in time. What can we expect that is better with 3.14 versus 3.8 ? I do not personally have a problem using #include for various capes if need be, but I am wondering if USB hotplug, and / or if USB support is better. As was with 3.15. usb/ethernet/pm is better. Right now we are integrating Charles's universal pinmux, which will allow you to 'mux' enabled peripherals on the fly. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBone Black switching to 3.14 kernel
On Wed, Sep 10, 2014 at 8:41 PM, William Hermans yyrk...@gmail.com wrote: Thanks Robert. pm == power management ? If so how is it better ? echo mem /sys/power/state actually works.. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBone Black switching to 3.14 kernel
Very nice. thanks Robert. On Wed, Sep 10, 2014 at 6:46 PM, Robert Nelson robertcnel...@gmail.com wrote: On Wed, Sep 10, 2014 at 8:41 PM, William Hermans yyrk...@gmail.com wrote: Thanks Robert. pm == power management ? If so how is it better ? echo mem /sys/power/state actually works.. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Bad data returned on UART2
I am running the latest official bbb Debian from an sd card. I have a cape that accepts a string and returns a string. The problem is the returned string is correct accept that random characters are missing. For example if the expected return is this is a test it returns thsa tst. I am using minicom to test. All the configs are correct so it has to be something in the Debian setup. Anybody have any idea what this could be? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Beaglebone Black rev B - Embedded QT and X Sever - Deployment OS Ubuntu
于 2014-9-10 21:15, Peter Gregory 写道: trying to get a minimal X server QT build working. I am doing the same thing at TI 8148。 I had make a ubuntu 12.04 with x,jwm,and QT 4.8 for x11. It take less than 500mb. A ubuntu without X is about 300mb in my experience. Adding a standalone QT , it take about 400mb. So I decided to use the ubuntu with X and a small WM at last. -- Vinge -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
