June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Timed wakeups from the real-time clock
Most systems have an RTC that can generate alarm interruptions up to 24 hours in the future. If so, the directory /sys/class/rtc/rtc0 will exist. It should contain the wakealarm file. Writing a number to wakealarm will cause it to generate an alarm that number of seconds later. If you also enable wake up events from rtc, it will resume a suspended device. For example, this would wake the system up in 30 seconds:
# cd /sys/devices/platform/pmic_rtc.1/rtc/rtc0# echo “+30” > wakealarm# echo “enabled” > power/wakeup
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