[beagleboard] Re: RTC's SDA and SCL Resistors

Look at the link in /dev/rtc: ls -al | grep rtc If you got it to point at /dev/rtc1, I would very much like to know how you accomplished that! On Friday, July 28, 2017 at 10:09:19 AM UTC-4, William B wrote: > > Greg, it's okay. I was able to make the RTC be recognized as rtc1 in the > system.

[beagleboard] Re: RTC's SDA and SCL Resistors

Only /dev/rtc0 is going to be updated automatically. /dev/rtc1 is not going to be updated automatically, as far as I can determine, with the Debian distributions as published. You would have to use the config tools to switch from rtc0 to rtc1 and compile a new kernel. So the common scheme you

[beagleboard] Re: RTC's SDA and SCL Resistors

Greg, it's okay. I was able to make the RTC be recognized as rtc1 in the system. Just turned off the BBB, disconnected everything that was connected to the hardware and starts again. I'm sure the RTC module was properly connected to the BBB, so I believe that there could only be some

[beagleboard] Re: RTC's SDA and SCL Resistors

Greg, I'd just like to prevent the RTC from being updated with the system date and time so that I can even use a script to do this task when I need to. How do I prevent the RTC from being updated automatically? Command response "timedatectl" root@beaglebone:~# timedatectl Local time: Fri

[beagleboard] Re: RTC's SDA and SCL Resistors

There is lots of stuff going on, and it is messy. Check out this link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785445 I tried the configuration via udev, but as reported in the above link, it doesn't work. Apparently the only way to get the /dev/rtc link to point to rtc1 instead of

[beagleboard] Re: RTC's SDA and SCL Resistors

Actually what is happening is this: when I remove the power from the BBB, the date and time return to the default setting. Because the RTC is automatically associated with system time auto-tuning, then its time is also being changed incorrectly (I had not noticed this in reboot because it is

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

Well, rtc0 is most likely the on AM335x on die real time clock, which will not persist time across reboots. On Thu, Jul 27, 2017 at 7:54 PM, William B wrote: > Finally I got ... the last hint from William Hermans indicated me > something about the device name, which could

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

William, Also to save you from future grief. Make sure you load the proper drivers for your hardware,then if you're going to write your own software to read from the RTC. Use /dev/rtcx( probably /dev/rtc1 ), and do not try to read directly from the RTC over I2C. Trust me . . . On Thu, Jul 27,

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

On Thu, Jul 27, 2017 at 4:24 PM, William B wrote: > Is there any other difference in this latest version of Debian? I'm > following a tutorial below, but the command "hwclock -r -f /dev/rtc1" is > indicating failure to communicate with the new device: > > *TUTORIAL*: >

[beagleboard] Re: RTC's SDA and SCL Resistors

Is there any other difference in this latest version of Debian? I'm following a tutorial below, but the command "hwclock -r -f /dev/rtc1" is indicating failure to communicate with the new device: *TUTORIAL*: https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/set-rtc-time

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

On Thu, Jul 27, 2017 at 3:02 PM, William B wrote: > *Grahan:* > You're 100% correct. Running "i2cdetect -y -r 2" instead of "1" at the > end, it detected the RTC at address 0x68, as we can see in the available > tutorials. > Answering your question, I'm using the latest

[beagleboard] Re: RTC's SDA and SCL Resistors

*Grahan:* You're 100% correct. Running "i2cdetect -y -r 2" instead of "1" at the end, it detected the RTC at address 0x68, as we can see in the available tutorials. Answering your question, I'm using the latest available Debian release (bone-debian-8.8-iot-armhf-2017-07-01-4gb.img) available

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

It's not so much the debian version, as it is the kernel. kernel 3.8.x is different from kernel 4.x. The easiest way to see what is attached it this: root@wgd:~# i2cdetect -l i2c-0 i2c OMAP I2C adapterI2C adapter i2c-1 i2c OMAP I2C adapter

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

What version of Debian are you running. On Debian 8, what was in the docs as I2C-1 is now I2C-2. Hook your translator to pins P9-19 and P9-20 and run "i2cdetect -y -r 2" I2C-2 is enabled in the device tree by default. --- Graham == -- For more options, visit http://beagleboard.org/discuss

Re: [beagleboard] Re: RTC's SDA and SCL Resistors

On Thu, Jul 27, 2017 at 1:24 PM, William B wrote: > Hi! > I bought the I2C logic converter 3.3V => 5v and I've connected the RTC to > the BBB, but running "i2cdetect -y -r 1" doesn't find the RTC device. I've > checked the wiring of the connections and I repeated the process

[beagleboard] Re: RTC's SDA and SCL Resistors

Hi! I bought the I2C logic converter 3.3V => 5v and I've connected the RTC to the BBB, but running "i2cdetect -y -r 1" doesn't find the RTC device. I've checked the wiring of the connections and I repeated the process a few times, but it doesn't detect the RTC. Any suggestion? -- For

[beagleboard] Re: RTC's SDA and SCL Resistors

Here is what I used: https://www.seeedstudio.com/Grove-High-Precision-RTC-p-2741.html I'm using the Greens so it conveniently plugs in to the Grove connector. The lithium coin cell was not available at the local stores and I had to order via Amazon. This device uses 3.3V battery and it is

[beagleboard] Re: RTC's SDA and SCL Resistors

John, I get it. But I do not know how it would be possible to do this in my DS1307 module which is of this type: http://www.ebay.com/itm/5-PCS-I2C-RTC-DS1307-AT24C32-Real-Time-Clock-Module-For-AVR-ARM-PIC-/172308340060?epid=846722400=item281e609d5c:g:VxcAAOSwawpXsn0J How would It connect to