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1. Purpose[edit source]
This article describes how to use RTC. The RTC overview is described in RTC overview article.
2. How to set a hardware clock thanks to hwclock tool[edit source]
3. How to set an alarm[edit source]
# disable the alarm #
echo 0 > /sys/class/rtc/rtc0/wakealarm
# calculate alarm with 1 minute later #
wakeuptime=`date -d "1 minute" +%s`
# set the alarm #
echo $wakeuptime > /sys/class/rtc/rtc0/wakealarm
4. How to set an alarm and go into a system sleep state with rtcwake tool[edit source]
5. References[edit source]