from:"Pablo Rodriguez"

Re: [beagleboard] PocketBeagle Power Problems

2020-05-19 Thread Pablo Rodriguez

Vin on same pocket Beagle is bugged, havent seen any official statement but
all My pb( like 6) have the same random reset when powered by Vin. Not when
powered from vusb with the same power supply.
Good luck

El mar., 19 de may. de 2020 7:02 PM, Paul Beam 
escribió:

> I have been trying to work through some PocketBeagle power weirdness.  I
> have an external battery backed supply which outputs 5V.  If I route power
> into Vin (P1.1) I run into problems with glitches from my power supply when
> I plug or unplug a USB charger.  The worst problem seems to be that VBAT
> gets a charge on it so that PocketBeagble won't start until I temporarily
> short VBAT to ground.  The other problem I get is sometimes the
> PocketBeagle will reboot.  My PS may not be perfect, but I have not been
> able to find on the scope anything that explains this.
>
> So, I moved my power input over to VBAT.  I no longer have rebooting
> issues nor any problems unplugging or plugging the charger.  But, all the
> 3.3V and Vout pins are still powered when the PocketBeagle is "Off."
> VIN-USB (P1.7) seems to turn on and off with the PB power LED.  Vout
> (P1.14) stays at 5V regardless of whether the PB is on or off, which means
> my connected circuitry stays on and drains power when things should be off.
>
> From what I can tell, VIN seems to have a different brownout threshold
> than VBAT, but I have no explanation for VOUT being on continuously when
> VBAT is applied.
>
> Thoughts?
>
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Re: [beagleboard] Pocket Beagle power question

2019-08-12 Thread Pablo Rodriguez

Hi,
The past year i have to power 3 pocketbeagle from Vusb because of the
random reset when connecting to Vin. This was the only thing that worked
for me. Did a lot of testing adding capacitance and non work.



El lun., 12 ago. 2019 a las 10:52, Jason Kridner ()
escribió:

> On Sat, Aug 10, 2019 at 9:50 PM Graham Haddock 
> wrote:
>
>> What I would do is some minor surgery on the PocketBeagle, disconnecting
>> the +5V lead coming in the microUSB connector.
>> The easiest way to do this would be to remove FB1 (ferrite bead in series
>> with USB +5).
>> Easy with "hot tweezers", or a pair of small soldering irons.
>> To restore the Pocketbeagle to factory configuration, solder FB1 back in.
>>
>>
> Whatever instability problems you are seeing, I don't see this addressing
> it. The PMIC is designed to dynamically switch between the P1.1 ("AC power"
> in PMIC terms, which always bothers me because it is never AC, but instead
> DC assumed to come from an AC-powered wall-supply). If somehow there's not
> enough capacitance to make the switch cleanly, I'd suspect you are doing
> something rather odd with the *load* you are putting on it. What else do
> you have connected?
>
> Anyway, I put both "AC" (P1.1) and "USB" (P1.7) on the headers on purpose
> and the full expectation is that if you are putting a power supply in (and
> it isn't a battery), you'll use P1.1. If it is battery, I also give you
> that option at P2.14 (BAT).
>
>
>> Short P1-Pin-1 and P1-Pin-7 together, and power the Beagle from whatever
>> you are going to power it with at +5V.
>> No issues with instability.
>>
>
> OK, now you are just asking for trouble. There's no justification for
> doing that.
>
> If the design isn't working as intended, then, let's talk about that and
> details, such as what you are seeing on a scope and P2.13 (VOUT), which is
> the output of the power mux on the PMIC, also referred to as SYS_5V on
> BeagleBones. Ultimately, this is used to provide the power to the
> regulators for the other subsystems. Perhaps your problem is drawing too
> much current from it?
>
> It can be argued I put too many power options on the header, but I tried
> to keep it flexible for people embedding it onto something. You have a lot
> of flexibility and I don't see any need to encourage people to alter the
> board.
>
> --
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> hardware computing
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Re: [beagleboard] Mounting Octavo SiP on Homemade Pocket Beagle

2019-01-31 Thread Pablo Rodriguez

i had success with a cheap stencil from oshstencil, solder paste and a
reflow oven, but first i tryed without solder paste and screw a pair of IC

El jue., 31 ene. 2019 a las 14:44, evilwulfie ()
escribió:

>
> https://www.ebay.com/itm/OK-Industries-SMT-8500-SMT-Manual-Placement-Machine/123087954705?hash=item1ca89d2311:g:q4oAAOSwl4Va2L3P:rk:9:pf:0
>
> yes more expensive than 500 bux, but to place that you would have a tough
> time
> doing it by hand unless your rock solid and no shaking.
>
>
>
> On 1/31/2019 10:34 AM, Jacek Radzikowski wrote:
>
> You can also ask at local laptop or phone repair shops. If they do more
> than just replacing broken screens, they should have tools and expertise to
> mount a BGA chip, and probably will do it much cheaper than $500.
>
> Jacek.
>
>
> On Thu, Jan 31, 2019 at 12:04 PM Mark A. Yoder 
> wrote:
>
>> I have a student who needs a very compact Linux system for his project.
>> He's selected a Pocket Beagle and has modified the Pocket Beagle PCB to
>> have a couple of additional components.  The next step is to have the board
>> made and mount the Octavo chip on the board.  His gotten a quote of some
>> $500 just to mount the chip.
>>
>> Ouch!
>>
>> So we've decided to mount the chip ourselves.  We have a reflow oven and
>> an x-ray machine.
>>
>> What suggestions do you all have that will improve the odds in getting it
>> mounted the first time?
>>
>> Thanks...
>>
>> --Mark
>>
>>
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>
>
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Re: [beagleboard] Re: PocketBeagles are Unstable

2018-12-11 Thread Pablo Rodriguez

Hi,

**If not, have you found the P1.1<=>P1.7 to be stable?

It has worked for me. No more random reboot after this.

I'm working in a clone board using the same IC as the PB, when they arrive
i will test stability powering from VIN and VUSB.

I have than this test on the BBBW and not detect any issue, although the
ICs are not the exactly same ( OSD335x vs OSD335x-SM).
Has anybody powering the OSD335x-SM from VIN with no stability problems?

Thanks,
Pablo

Pablo

El mar., 11 dic. 2018 a las 9:44,  escribió:

> We are seeing something similar on a board we designed using USB1 host. We
> have PB powered through VIN, with P1.7 floating and are seeing spurious
> reboots a few times per day. We are running on latest 9.5 image.
>
> Our initial thought was that it was related to our 5V supply on Vin, and
> were going to start adding capacitance, and doing some testing based on
> this line of thought, but it seems you've already been down this road and
> it did not have an impact. Have there been any new findings since July? If
> not, have you found the P1.1<=>P1.7 to be stable? In our case this would be
> fine since we remove the uUSB connector anyway.
>
> Thanks
>
> -- Brian
>
> On Monday, July 30, 2018 at 10:53:35 AM UTC-4, Graham wrote:
>>
>> Yes it is a real world scenario.
>>
>> I don't recommend you do it unless you are really knowledgeable in the
>> way that USB power works, and are willing to accept the consequences if you
>> do it wrong.
>> A 100 Ohm resistor is way too high to power a PocketBeagle through.
>> If you make it low enough to cross-feed power between the pins, then it
>> is too low to prevent problems.
>>
>> Rather than design a circuit that will allow it to work safely under all
>> circumstances, I suggest the PMIC and control software in the PocketBeagle
>> get fixed, so it works as well as, and just like a BBB.  It is supposed to
>> be the same base parts.
>>
>> In the meantime, I suggest that shorting Pin 1 and Pin 7 be restricted to
>> use as a workaround, in the event you need to power a PocketBeagle from 5
>> Volts only, and not plug in a USB source of power at the same time, or
>> defeat the USB power lead if you do need to plug in USB for
>> control/communications.
>>
>> --- Graham
>>
>> ==
>>
>> On Sunday, July 29, 2018 at 10:17:11 PM UTC-5, acheesehead wrote:
>>>
>>> Here's an example. PB is powered by external 5V through Vin. Then, user
>>> hooks up a powered USB hub to Vusb interface to hook up peripherals through
>>> the USB hub. Not an unreasonable scenario.
>>>
>>> Nothing that I would do of course!
>>>
>>>
>>> On Sunday, July 29, 2018 at 9:01:52 PM UTC-6, acheesehead wrote:

 I am just worried about somebody powering from Vin and Vusb
 simultaneously.

 I have seen crazier things happen. Seems like a safety net. ID10T thing.


>>
>>
>>> On Sunday, July 29, 2018 at 3:26:01 PM UTC-6, Graham wrote:
>
>
> It depends what you are trying to do and what you are worried about.
>
> I would not recommend trying to power it from both USB and External 5V
> with Pin 1 and Pin 7 shorted.  That is just a work-around to keep it
> running when powered from external +5 V.
>
> --- Graham
>
> ==
>
> On Sunday, July 29, 2018 at 1:35:15 PM UTC-5, acheesehead wrote:
>>
>> Should there be a low Ohm resistor between P1 and P7? Maybe 100 Ohm?
>> Just in case an external USB 5V has a difference between the P1 VIN.
>>
>>
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Re: [beagleboard] Re: BeagleBone Black won't boot after wiring up LED strip w MOSFETs and separate 12V power supply

2018-09-13 Thread Pablo Rodriguez

Is anything coming out from the uart console?


El jue., 13 sept. 2018 a las 10:59, witop01 via BeagleBoard (<
beagleboard@googlegroups.com>) escribió:

>
>
> 在 2015年3月6日星期五 UTC+8下午2:41:17，gr...@sensa.io写道：
>>
>> I wired up a circuit with an LED strip, 3 N-channel MOSFETs, and a
>> separate 12V power supply, with the gate pins on the MOSFETS connected to
>> I/O pins on the Beaglebone.
>>
>> When I didn't connect the circuit to the Bone ground, I apparently fried
>> 2 boards. Neither will boot up. One gives a flicker on the power light and
>> then goes off, and on the other the power light turns on, but the other
>> LEDs don't flash and I can't get into either board.
>>
>> Here is the thread on the Adafruit forum with a photo of the circuit:
>> http://forums.adafruit.com/viewtopic.php?f=8=69691=353330=eff0f5bd69bba9338e6f0ec2d7fa70c4#p353330
>> *The Adafruit support said that setup should not have hurt the board. *
>>
>> I checked the voltage on the gate pin on each MOSFET that was connected
>> to the Bone and it was nominal (~200mA).
>>
>> Does anyone have any ideas on this? How could this have fried 2 boards?
>>
>> Thanks for any help.
>>
>> And PS I posted this earlier today but didn't see it show up in the
>> forum. Sorry if it needed to be approved and you are getting a duplicate.
>>
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Re: [beagleboard] Custom board boots up, UART works, USB doesn't

2018-09-08 Thread Pablo Rodriguez

Hi. The schematic of the USB0 is the same as they pocket?

El sáb., 8 de sep. de 2018 2:15 PM, An Ra  escribió:

>
> Hi all,
>
> I have a custom board (based on PocketBeagle design). I was able to flash
> the EEPROM and it boots up normally and I have access to the Linux command
> Line through UART0 interface. However, the board doesn't show up as a USB
> device as the PocketBeagle does.
>
> Any ideas how to solve this issue?
>
> Regards,
>
> --
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Re: [beagleboard] BeagleBone Black GPS PPS and Chrony for time sync

2018-08-29 Thread Pablo Rodriguez

Hi.
 Is posible to boot from an microsd and modify the uEnv  file on the emmc
after mounting it?
Sorry if i misunderstood the problem

Pablo

El mié., 29 de ago. de 2018 5:49 PM, Robert Nelson 
escribió:

> On Wed, Aug 29, 2018 at 3:05 PM Thomas 
> wrote:
> >
> > Robert,
> > Your help is much appreciated!  Making progress I think...  Well, kind
> of...
> >
> > So I attempted to replace target = <>; with target = "/"  (when it
> should have been target-path)
> >
> > I didnt notice the typo and applied the overlay in uEnv.txt and
> rebooted.  Now, I can not connect to the device.  When I hit the reset
> button, the networking stack is brought up, so I can ping the device, but
> that is it.  No SSH.  So I connected a USB cable, and it appears that I am
> having issues with it also...  The PC is not creating the ethernet adapter
> when the cable is connected.
> >
> > Any thoughts as to how to recover from this state besides trying to
> re-flash the device?
>
> If you were using the microSD, i'd say to just fix it.. But with the
> eMMC, you'll pretty much need a reflash.  U-Boot currently doesn't
> have any error detection when applying overlays.. Everything just
> breaks in bootup..
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
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[beagleboard] Re: omap serial driver rs485 loopback

2018-08-27 Thread Pablo Rodriguez

Adding rs485-rx-during-tx to the .dts do the trick.


 fragment@2 {
target = <>;
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <_uart2_rs485_pins>;
rs485-rts-delay = <0 0>;

rts-gpio = < 25 1>; /*  GPIO_ACTIVE_HIGH>; */
rs485-rts-active-high;
   * rs485-rx-during-tx;  *  
linux,rs485-enabled-at-boot-time;
};
};

Thanks

El lunes, 27 de agosto de 2018, 12:53:06 (UTC-3), Pablo Rodriguez escribió:
>
>
> Hi,
> I'm using omap serial driver to do some rs485 writing and reading. The rts 
> gpio is toggling correctly and the RE pin is grounded, so rx is always 
> enabled.
> Have done test with other rs485 board and it can write and read.
>
> The issue is that the uart is not receiving what it has wrote, so can't 
> check if a bus collision occurs when writing.
>  I have been using the same setup with the 8250 serial driver but with 
> manual rts toogling and the loopback was ok.
>
> Is this the expected behavior of the omap serial driver?
> Is possible to configure to enable loopback?
>
> using kernel
> 4.14.63-bone16
>
> Thanks,
> Pablo
>

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Re: [beagleboard] omap serial driver rs485 loopback

2018-08-27 Thread Pablo Rodriguez

looking in the source of the driver found this.

if ((up->rs485.flags & SER_RS485_ENABLED) &&
!(up->rs485.flags & SER_RS485_RX_DURING_TX))
serial_omap_stop_rx(port);

suppose that i need to set this flag.
SER_RS485_RX_DURING_TX

This is done in the .dts file or in runtime?

Thanks,
Pablo



El lun., 27 ago. 2018 a las 12:53, Pablo Rodriguez ()
escribió:

>
> Hi,
> I'm using omap serial driver to do some rs485 writing and reading. The rts
> gpio is toggling correctly and the RE pin is grounded, so rx is always
> enabled.
> Have done test with other rs485 board and it can write and read.
>
> The issue is that the uart is not receiving what it has wrote, so can't
> check if a bus collision occurs when writing.
>  I have been using the same setup with the 8250 serial driver but with
> manual rts toogling and the loopback was ok.
>
> Is this the expected behavior of the omap serial driver?
> Is possible to configure to enable loopback?
>
> using kernel
> 4.14.63-bone16
>
> Thanks,
> Pablo
>
> --
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[beagleboard] omap serial driver rs485 loopback

2018-08-27 Thread Pablo Rodriguez


Hi,
I'm using omap serial driver to do some rs485 writing and reading. The rts 
gpio is toggling correctly and the RE pin is grounded, so rx is always 
enabled.
Have done test with other rs485 board and it can write and read.

The issue is that the uart is not receiving what it has wrote, so can't 
check if a bus collision occurs when writing.
 I have been using the same setup with the 8250 serial driver but with 
manual rts toogling and the loopback was ok.

Is this the expected behavior of the omap serial driver?
Is possible to configure to enable loopback?

using kernel
4.14.63-bone16

Thanks,
Pablo

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Re: [beagleboard] Starting up PocketBeagle without USB

2018-08-16 Thread Pablo Rodriguez

Hi,
PocketBeagle doesn´t wifi, at least the ones i have.
The usb cable is the way to connect and power the pocketbeagle at the same
time.
If you want to power it from 5V Vin you could use a ftdi cable at the
console uart 0 to login.

Pablo

2018-08-16 14:28 GMT-03:00 :

> Hey all,
>
> Im having an issue connecting to my PocketBeagle without it being
> connected via USB. I set up the wifi and set a static IP Address while the
> beagle was connected to my computer. Then disconnected the USB from my
> computer and connected a 5V power supply to VIN on the beagle. However, now
> I am not seeing the beagle in my attached networks after waiting for a few
> minutes.
>
> Next I tried connecting the beagle to my computer, attaching 5V power
> supply to VIN while it was still plugged in, then disconnect the USB and
> the connection disappears.
>
> Is there something extra I must do so that the PocketBeagle operates
> normally while its plugged in to USB and while its only plugged into a
> power supply?
>
> Thanks!
>
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[beagleboard] Re: omap serial driver rs485 loopback

Re: [beagleboard] omap serial driver rs485 loopback

[beagleboard] omap serial driver rs485 loopback

Re: [beagleboard] Starting up PocketBeagle without USB

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