The state of the rtc/fram battery can be found in the linux file "/proc/driver/rtc" on the device.
The following linux command, shows the battery state:
Bash
cat /proc/driver/rtc | grep batt_status
batt_status : okay
If the battery has a malfunction or is low, the output looks like this.
Bash
cat /proc/driver/rtc | grep batt_status
batt_status : dead
Remarks:
-
Only while booting the system the state of the battery will be read and saved in the batt_status information of "/proc/driver/rtc".
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During the operation of the device, the value of "batt_status" remains the same.During the operation of the device, is the battery power consumption insignificant.