I mounted the Adafruit DS3231 RTC module on a breadboard and using the Adafruit instructions got it to work. It works fine but it takes one minute after booting the BBB before it reads the clock date and time and updates to Debian. I would like it to update right away when the BBB boots up. I suspect that the BBB is trying to get the date and time thru the Ethernet connection but don’t know. Any help please?
Thanks, John
Here’s the Adafruit DS3231 info:
https://learn.adafruit.com/adafruit-ds3231-precision-rtc-breakout/downloads
and here’s the instructions:
https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/set-rtc-time
My systemd code is:
[Unit]
Description=DS3231 RTC Service
[Service]
Type=simple
WorkingDirectory=/usr/share/rtc_ds3231
ExecStart=/bin/bash clock_init.sh
SyslogIdentifier=rtc_ds3231
[Install]
WantedBy=multi-user.target
and my clock_init.sh code is:
#!bin/bash
sleep 15
echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock -s -f /dev/rtc1
hwclock -w