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https://github.com/dresden-elektronik/raspbee2-rtc

RTC kernel module builder for RaspBee II
https://github.com/dresden-elektronik/raspbee2-rtc

Last synced: 4 days ago
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RTC kernel module builder for RaspBee II

Host: GitHub
URL: https://github.com/dresden-elektronik/raspbee2-rtc
Owner: dresden-elektronik
License: bsd-3-clause
Created: 2019-09-24T10:02:56.000Z (over 5 years ago)
Default Branch: master
Last Pushed: 2024-10-07T06:19:45.000Z (3 months ago)
Last Synced: 2024-12-20T12:52:34.665Z (9 days ago)
Language: Makefile
Size: 35.2 KB
Stars: 20
Watchers: 8
Forks: 2
Open Issues: 3
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

# 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
* Raspberry Pi 1, 2B, 3B, 3B+ or 4B, 5
* [RaspBee II](https://phoscon.de/raspbee2) Zigbee shield
* FW version 26610700 or higher (http://deconz.dresden-elektronik.de/deconz-firmware/deCONZ_RaspBeeII_0x26610700.bin.GCF)

### 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

0. Update Raspberry Pi and Reboot

sudo apt update
sudo apt upgrade
reboot

1. Install dependencies

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

2. Download installation archive

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

3. Change into extracted directory

cd raspbee2-rtc-master

4. Compile RTC kernel module

make

5. Install RTC kernel module

sudo make install

6. Reboot Raspberry Pi

sudo reboot

7. Configure system time to RTC module

sudo hwclock --systohc

8. 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