install & setup of an I2C RTC on RaspberryPi (both Arch Linux ARM and Raspbian)

55_rpi_realtimeclock.cate

#!/bin/bash
#-----------------------------------------------------------
# Copyright (C) 2014-2016 GRUBERND http://grubernd.at
# released under a FreeBSD License
#-----------------------------------------------------------
# CATE installer module :: device RealTimeClock RPi
#
#       !!  needs to be run as root / sudo  !!
#
# works both for DS1307 and DS3231 chips.
# this script is also designed to run standalone for
# both Arch Linux ARM and Raspbian installs.
#-----------------------------------------------------------
#_CATECONF__    # RTC service requires no configuration

if [[ "$(which pacman)" != "" ]]; then
    echo -e ""
    echo -e ".. installing I2C RTC for Arch Linux ARM"
    echo -e ""
    modules_file="/etc/modules-load.d/raspberrypi.conf"
    pacman -S --needed --noconfirm i2c-tools
fi

if [[ "$(which apt-get)" != "" ]]; then
    echo -e ""
    echo -e ".. installing I2C RTC for Raspbian"
    echo -e ""
    modules_file="/etc/modules"
    apt-get install --yes i2c-tools
fi

echo -e ""
echo -e ".. activating I2C devicetree in /boot/config.txt"

sed --in-place 's/^#device_tree_param=i2c_arm=on/device_tree_param=i2c_arm=on/' "/boot/config.txt"

#-----------------------------------------------------------
echo -e ""
echo -e ".. adding i2c and rtc modules to the conf"

cp "$modules_file" /tmp/rtc.tmp
echo rtc-ds1307 >> /tmp/rtc.tmp
echo i2c-dev    >> /tmp/rtc.tmp
sort /tmp/rtc.tmp | uniq > "$modules_file"

#-----------------------------------------------------------
echo -e ""
echo -e ".. creating init script for the RTC"

mkdir -p /usr/lib/systemd/scripts/
cat > /usr/lib/systemd/scripts/rtc << ENDRTCSCRIPT
#!/bin/bash
# create an i2c device DS1307 (works also for DS3231)
# set systemclock from external i2c-rtc

echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock -s
ENDRTCSCRIPT

chmod 755 /usr/lib/systemd/scripts/rtc

echo -e ""
echo -e ".. creating service for the RTC"

cat > /etc/systemd/system/rtc.service << ENDRTCSERVICE
[Unit]
Description=RTClock
Before=network.target
 
[Service]
ExecStart=/usr/lib/systemd/scripts/rtc
Type=oneshot

[Install]
WantedBy=multi-user.target
ENDRTCSERVICE

#-----------------------------------------------------------
echo -e ""
echo -e ".. enabling and starting RTC service"

systemctl enable rtc
systemctl start rtc

#-----------------------------------------------------------
#_CATETEST__    echo -e ""
#_CATETEST__    echo -e ".. systemctl status rtc"
#_CATETEST__    systemctl status rtc
#_CATETEST__    echo -e ""
#_CATETEST__    echo -e ".. testing i2c activation in /boot/config.txt"
#_CATETEST__    grep "^device_tree_param=i2c_arm=on" /boot/config.txt
#_CATETEST__    echo -e ""
#_CATETEST__    echo -e ".. testing connection of i2c devices"
#_CATETEST__    i2cdetect -y 1
#_CATETEST__    echo -e ""
#_CATETEST__    echo -e ".. testing rtc hwclock"
#_CATETEST__    hwclock

I know this is simple. How do I execute this script on my rpi 4.? What is the cammand to do that? Can i retrieve the github script with 1 command and run it?

Thank you

Dave

“I’m sorry, Dave. I’m afraid I can’t do that.”

Besides, this script has neither been tested nor updated since 2016.
I have no idea if it still works. I have not used it for at least five years.

Ok Thank you for responding. I very much appreciate it. Thanks Dave

…

On Wed, Jun 14, 2023 at 4:04 PM grubernd ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ “I’m sorry, Dave. I’m afraid I can’t do that.” Besides, this script has neither been tested nor updated since 2016. I have no idea if it still works. I have not used it for at least five years. — Reply to this email directly, view it on GitHub <https://gist.github.com/grubernd/aed721614b36aaa31fd97ef5ab1ec6be#gistcomment-4599734> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIEP3SLTCN6CPP2MB7JOHS3XLIKLNBFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFQKSXMYLMOVS2I5DSOVS2I3TBNVS3W5DIOJSWCZC7OBQXE5DJMNUXAYLOORPWCY3UNF3GS5DZVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVAZTMNRVGY4DCNNHORZGSZ3HMVZKMY3SMVQXIZI> . You are receiving this email because you commented on the thread. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .