Make sure the following two lines are added to /boot/config.txt:
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dtparam=i2c_arm=on dtoverlay=i2c–rtc,pcf85063a,i2c_csi_dsi |
Reboot the board. The RTC should show up in the kernel log:
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pi@raspberrypi:~ $ dmesg | grep pcf [ 7.155444] rtc–pcf85063 10–0051: registered as rtc0 [ 7.160928] rtc–pcf85063 10–0051: hctosys: unable to read the hardware clock |
and you can use various hwclock commands.
Synchronize system clock to hardware clock:
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sudo hwclock –w |
Synchronize hardware clock to system clock:
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sudo hwclock –s |
Read the hardware clock:
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sudo hwclock –r |
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