M5Stack/examples/Advanced/MultSerial/MultSerial.ino

/*
*******************************************************************************
* Copyright (c) 2023 by M5Stack
*                  Equipped with M5Core sample source code
*                          配套  M5Core 示例源代码
* Visit for more information: https://docs.m5stack.com/en/core/gray
* 获取更多资料请访问: https://docs.m5stack.com/zh_CN/core/gray
*
* Describe: MultSerial.  多串口
* Date: 2021/8/5
******************************************************************************
*/
#include <M5Stack.h>

void setup() {
    M5.begin();  // Init M5Core.  初始化 M5Core
    // Serial2.begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t
    // txPin, bool invert)
    Serial2.begin(115200, SERIAL_8N1, 16,
                  17);  // Init serial port 2.  初始化串口2
}

void loop() {
    if (Serial
            .available()) {  // If the serial port reads data.  如果串口读到数据
        int ch = Serial.read();  // Copy the data read from the serial port to
                                 // the CH.  把串口读取到的数据复制给ch
        Serial2.write(
            ch);  // Serial port 2 Outputs the CH content.  串口2输出ch的内容
        M5.Lcd.printf("Serial:%d\n",
                      ch);  // The screen prints the data received by serial
                            // port 2.  屏幕打印串口2收到的数据
    }

    if (Serial2.available()) {
        int ch = Serial2.read();
        Serial.write(ch);
        M5.Lcd.printf("Serial2:%d\n", ch);
    }
}