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RaspBee II RTC

RTC kernel module builder for RaspBee II

This repository provides a Makefile which downloads, builds and installs the RTC kernel module for the RaspBee II Zigbee shield for Raspberry Pi.

The RTC is not mandatory for the use of the RaspBee II as a ZigBee coordinator.

When the linux kernel gets updated it can happen that the RTC module build fails because it takes some time until the raspberry pi kernel headers package is updated with the new version. In this case you can repeat the build in a few days. Or get your kernel version from somewhere else (rpi-source) or try use a workaround described below.

Dependencies

Hardware

Additional Notes for Raspberry Pi 5 and Home Assistant

Raspberry Pi 5

add following to your config.txt

  • enable_uart=1
  • dtparam=uart0_console
  • dtoverlay=uart0

Home Assistant

  • use the Port ttyAMA0 even if it says ttyAMA10

Supported platforms

Raspbian Stretch, Buster, Bullseye and expectedly later versions

Install

  1. Update Raspberry Pi and Reboot

     sudo apt update
 sudo apt upgrade
 reboot

  2. Install dependencies

     sudo apt install i2c-tools build-essential raspberrypi-kernel-headers

  3. Download installation archive

     curl -O -L https://github.com/dresden-elektronik/raspbee2-rtc/archive/master.zip
 unzip master.zip

  4. Change into extracted directory

     cd raspbee2-rtc-master

  5. Compile RTC kernel module

     make

  6. Install RTC kernel module

     sudo make install

  7. Reboot Raspberry Pi

     sudo reboot

  8. Configure system time to RTC module

     sudo hwclock --systohc

  9. Test that RTC is working

     sudo hwclock --verbose

    Waiting in loop for time from /dev/rtc0 to change
 ...got clock tick
 Time read from Hardware Clock: 2020/03/06 13:55:21
 Hw clock time : 2020/03/06 13:55:21 = 1583502921 seconds since 1969
 Time since last adjustment is 1583502921 seconds
 Calculated Hardware Clock drift is 0.000000 seconds
 2020-03-06 14:55:20.017097+01:00
    timedatectl

    Local time: Fri 2020-04-03 12:42:20 CEST
        Universal time: Fri 2020-04-03 10:42:20 UTC
              RTC time: Fri 2020-04-03 10:41:56
             Time zone: Europe/Berlin (CEST, +0200)
        System clock synchronized: no
           NTP service: inactive
       RTC in local TZ: no

Troubleshooting

If something went wrong during install please consider the following error sources:

  • Install dependencies
  • Execute make without sudo
  • Execute make install with sudo
  • If behind a proxy make sure it is correctly configured

If you get Error Message like

make -C /lib/modules/6.1.21-v8+/build M=/home/openhabian/raspbee2-rtc-master modules
        make[1]: *** /lib/modules/6.1.21-v8+/build: File or directory not found.  Exit.
        make: *** [Makefile:17: build] Error 2
  • try adding "arm_64bit=0" to config.txt, (disables 64bit) reboot and try again
  • or link your kernel version lib/modules directory to existing kernel header directory in /usr/src
ls -l /usr/src
sudo ln -s /usr/src/linux-headers-6.6.20+rpt-rpi-v7l /lib/modules/$(uname -r)/build

Use the RTC

Set RTC time to system time:
sudo hwclock --systohc

Read the RTC time:
sudo hwclock -r

For more information see: https://linux.die.net/man/8/hwclock