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RTC

Introduction​

A real-time clock (RTC) is an electronic device (most commonly in the form of an integrated circuit) that measures the passage of time.

Interface Test Method​

  • Install the RTC battery in the RTC interface as shown here
rock 5 itx rtc
  • Check if the rtc device is successfully registered
[ 5.438578] rtc-hym8563 6-0051: registered as rtc0

As shown above, the rtc device is rtc0

  • Checking the rtc time
hwclock -r -f /dev/rtc0

  • Check if the current time is accurate, if not, please synchronise the current time.

  • Write time to rtc

hwclock -w -f /dev/rtc0
  • Check the rtc time again to make sure it's the same as the current time.
hwclock -r -f /dev/rtc0
  • Disconnect the network and power off for 10 minutes, then power on after 10 minutes to see if the rtc time is the same as the current one.