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11. RTC (Real Time Clock)
11.1 Block Diagram
The chip of RTC is PCF8563 from microchip. It is mounted on the system I2C bus.
The OS itself has the driver inside, only need are some configurations.
11.2 Configuration
Adding the dtoverlay parameter to the /boot/config.txt file.
Note：
1. Make sure the i2c-1 driver point is open, and the point is closed default.
2. The estimated backup time of the RTC is 15 days.
12. Bluetooth
Below example describe the process of setting up a Bluetooth connectivity.
1. Execute bluetoothctl command to operate Bluetooth feature.
$ sudo bluetoothctl
2. Enable the agent on to scan and discovery other Bluetooth devices.
[bluetooth]# agent on
[bluetooth]# scan on
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