M5StackBasic Serial1 GPIO Test RX2 TX5

M5Stack-ESP32_Serial1_2RX_5TX_Jikken1.ino

 //HardwareSerial Serial2(2);//これは不要でいれるとエラーになる
#include <M5Stack.h>

void setup() {
  // initialize both serial ports:
  //Serial.begin(115200);
  M5.begin();//この中でSerial(USB Serial)の115200宣言含む
  //Serial2.begin(115200);
   Serial1.begin(115200, SERIAL_8N1,2, 5);//GPIO2:RX ,GPIO5:TX 
}

void loop() {
  // read from port 1, send to port 0:
  if (Serial1.available()) {
    int inByte = Serial1.read();
    Serial.print("Recieved=");
    Serial.println(inByte);
  }

  // read from port 0, send to port 1:
  if (Serial.available()) {
    int inByte = Serial.read();
    Serial.print("KeyIn=");
    Serial.println(inByte);
    Serial1.write(inByte);
  }
}