11. UART

11.1. Introduction

The serial port interface diagram is as follows.

11.2. DTS configuration

File path kernel-5.10/arch/arm64/boot/dts/rockchip/roc-rk3588-pc.dtsi

/* uart7 */
&uart7 {
	status = "okay";
	pinctrl-0 = <&uart7m0_xfer>;
};

After configuring the serial port, the hardware interface corresponds to the node on the software as

UART7: /dev/ttyS7

11.3. Send and receive verification

The easiest way is to short the UART7 TX RX pins, then use the command to execute the command on the debug serial port or ADB

busybox stty -echo -F /dev/ttyS7 # Turn off display back
cat /dev/ttyS7 & # get /dev/ttyS7 input string in the background
echo "firefly uart test..." > /dev/ttyS7 # Input string

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