The LuckFox Pico has three serial ports: UART2, UART3, and UART4. Among them, UART2 is the debug port.

The LuckFox Pico Plus has four serial ports: UART2, UART3, UART4, and UART5. Among them, UART2 is the debug port.

】Performing serial port testing using the GPIO sysfs interface：

(The following operations need to be performed in the terminal of the Pico development board.)

1] View serial port：

root@linaro-alip:/home/linaro# ls /dev/ttyS*

/dev/ttyS3 /dev/ttyS4

##The serial port devices here are UART3 and UART4

2] Use the “stty” tool to query the serial port communication parameters：

linaro@linaro-alip:~$ stty -F /dev/ttyS3

speed 9600 baud; line = 0;

-brkint -imaxbel

##The default baud rate is 9600

3] Modify the baud rate, where ispeed is the input rate and ospeed is the output rate：

stty -F /dev/ttyS3 ispeed 115200 ospeed 115200

4] Disable echo：

stty -F /dev/ttyS3 -echo

## Disabling echo refers to the situation where the characters entered in the terminal or serial communication are no longer displayed on the terminal.

5] Operation process screenshot:

】Communicating with a Windows host：

Connect one end of the serial port module to the computer, and the other end to the physical pins 18 (GND), 19 (UART7_TX), and 20 (UART7_RX) of the LuckFox Pico.

Download and open PuTTY (or any other serial port software), select the serial port, and set the baud rate (default is 9600, please adjust it according to your actual modified value).

Execute the following command on the terminal of the development board to write the strings “Hello” and “world!” to the terminal device file using the echo command:

echo Hello > /dev/ttyS3

echo "world !" > /dev/ttyS3

The serial port debugging assistant on Windows will receive the content:

】Test the built-in sample program of the official SDK：

1] Download SDK&Compiling test example code or download Compiled example code.:

SDK GitHub Download

2] Transfer the test example code file to the development board.

(The following operations need to be performed in the terminal of the Pico development board)

3] Run the test sample program:

chmod 777 ./luckfox_uart_test

## Grant executable permissions to the file

./luckfox_uart_test 3

##The parameter 3 in the example represents UART3.

4] Open the serial communication device to receive data:

TAG： Raspberry Pi 5 Official Original AI Kit Hailo8l 13Tops/26Tops PCIe M.2 HAT+ Board For Pi5 Servo PWM motor WP5320 WP5335 35/20KG.CM 180° PWM digital servo double ball bearings Milk-V Duo Tutorial ESP32 S3 Development Board 2.8 inch B LCD 2.8inch Display 480x640 TouchScreen QMI8658 Sensor / Battery Port LVGL/HMI For Arduino Raspberry-Pi-Game-1.54inch-LCD-touchscreen-display-ST7789 Arduino IR Thermal Imaging Camera 4inch Round LCD HDMI Capacitive Touchscreen Display 720x720 For Raspberry Pi/Jetson Nano/mini PC Raspberry Pi 5 DSI User Guide Raspberry Pi 5 AI kit Hailo8 26Tops PCIe to M.2 NVMe HAT Plus For Pi5 Jetson Nano Case Raspberry Pi 5 PCIe to SSD Serial UART Bus Servo ST3025 TTL 40KG.CM Magnetic Encoder 360° High Precision And Large Torque ESP32-C6 1.54 inch Passive NFC e-Paper BW Display E-ink Screen No Need Battery Wireless Powered & Data Transfer Raspberry Pi 5 POE PCIe To M.2 E KEY NGFF WIFI7 WIFI6 For BE200/AX210/AX200/RTL8822CE ESP32-S3 Nano ESP32-S3R8 development board compatible with Arduino Nano ESP32 Raspberry Pi 1.3inch LCD STM32 1.54inch OLED ESP32 Thermal imaging camera UGV Beast PT AI 4G 5G OpenCV Robot Car MediaPipe For Raspberry Pi4B/5

Luckfox Pico RV1103【Tutorial on how to use UART】

【First-level Agency】LuckFox Pico Linux RV1103 Rockchip AI Board ARM better than Raspberry Pi Pico

Luckfox Pico RV1103【Tutorial on how to use UART﻿】

【First-level Agency】LuckFox Pico Linux RV1103 Rockchip AI Board ARM better than Raspberry Pi Pico

Luckfox Pico RV1103【Tutorial on how to use UART】