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by dfries
Mon Jun 03, 2019 12:30 pm
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

TerryMulhern wrote:
Mon Jun 03, 2019 6:08 am
Thank you for the setup and the source. Have you tried to run NTPD in this environment? Or perhaps anyone here who successfully managed that?
I have ntpd running on all my RPI systems, with or without a hardware RTC.
by dfries
Sun May 26, 2019 10:37 pm
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

`journalctl -b` also starts out with Nov 3, for me. Unfortunately the way things are setup right now, the module and the hardware real time clock isn't available early enough in boot to load the current time, that might require a kernel with the rtc module and device tree entries built in. As I had ...
by dfries
Tue Mar 19, 2019 12:17 am
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

https://learn.pimoroni.com/tutorial/san ... perpixel-4

If that's what you are talking about, it says i2c is broken out on the back of the display that you could connect the RTC, no need to try to disconnect it.
by dfries
Wed Mar 13, 2019 12:49 pm
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

If there were multiple real time clocks specifying --rtc makes sure the one detected is the one read. It is a good idea to specify it. udev defines $root/$name Replace the line with the following gives "root /dev name rtc0" or /dev/rtc0 once they are put together. KERNEL=="rtc0", RUN+="/bin/bash -c ...
by dfries
Thu Jun 07, 2018 3:44 pm
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

@WGB Here's a link I found, just curious why would you want to disable keeping the RTC in sync except on a clean shutdown?
https://unix.stackexchange.com/question ... ernel-mode
by dfries
Sat May 26, 2018 12:19 am
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

Thanks for that, i2cdetect. I have UU instead of 68 for i2cdetect. UU means a driver has claimed that address, check /boot/config.txt, which also requires a reboot.
by dfries
Sun Apr 01, 2018 4:15 pm
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

Re: RTC DS3231 setup on stretch

i folloed the instructions but its disabled my pitop speaker, im running latest stretch raspbian. I don't have a pi-top speaker to test with, I read that it does use I2C, which is how the DS32131 is also connected. I2C uses addresses, as long as they have different address all devices should be sti...
by dfries
Sat Mar 31, 2018 7:29 pm
Forum: General discussion
Topic: RTC DS3231 setup on stretch
Replies: 18
Views: 10692

RTC DS3231 setup on stretch

Raspberry Pi Real Time Clock setup instructions for Raspbian Stretch. This version adds a new udev rule instead of editing /lib/udev/hwclock-set that is replaced on system upgrade. Hardware: Connect GND, 3.3V VCC, SDA, SCL from the RTC to corresonding RPI pin header. RPI configuration: Add configura...
by dfries
Mon Mar 27, 2017 2:00 am
Forum: General discussion
Topic: disk activity led blinks once a second
Replies: 18
Views: 4641

Re: disk activity led blinks once a second

the kernel sends a "Send Status" command to the SD card But, the standard setup has the root filesystem on that SD card, yank it, and it is time to reset even if you put it right back in. So for the standard setup might as well just disable the polling because if you pull the SD card it is game ove...

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