11. UART¶

11.1. Hardware interface¶

Core-3588SG The following figure shows the serial port of the hardware version：

_images/usage_uart_interface.png

11.2. DTS config¶

File path kernel-5.10/arch/arm64/boot/dts/rockchip/rk3588-firefly-port.dtsi

&uart0 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart0m2_xfer>;
};

&uart3 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart3m2_xfer>;
};

&uart4 {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&uart4m0_xfer>;
};

&uart5 {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&uart5m1_xfer>;
};

After the serial port is configured, the node corresponding to the hardware interface

UART0:   /dev/ttyS0
UART3:   /dev/ttyS3
UART4:   /dev/ttyS4
UART5:   /dev/ttyS5

11.3. UART send and receive¶

The easiest way to do this is to stub the UART0 TX RX pin and then use the command to execute the command in the debug serial port or ADB

busybox  stty -echo -F /dev/ttyS0          # Close the echo
cat /dev/ttyS0 &                           # Get /dev/ttyS0 
echo "firefly uart test..." > /dev/ttyS0   # Input string

The final debugging serial port terminal can receive the string “firefly uart test…”