I'm trying to use the hat pins at the top of the board, and from what I've read the ESP32 has the ability to assign almost any function to a particular pin. In my case I wanted to use pins 26 and 36 for TX and RX.

I've tried a few different things including:

• Using pins 36, 26 in setup
• Using pins 5 and 15 in setup (based on this diagram I thought the pins might have been wrong)
• Switched to just trying digitalWrite on the pins and looking for a result.

My setup is:

• M5StickC connected via USB to laptop - COM6
• USB to serial device (jumper set to 3.3v) - COM7

#include <M5StickC.h>


void setup() {
  // Setup the TFT display
  M5.begin();
  
  // Setup the serial port for debugging
  Serial.begin(115200);
  Serial.println();
  Serial.println("Ready.");

  //Serial2.begin(115200, SERIAL_8N1, 26, 36);
  //Serial2.println("Testing Serial2");
  pinMode(5, OUTPUT);
  pinMode(15, OUTPUT);
}

void loop() {
  //Serial2.print("Testing Serial2: ");
  //Serial2.println(millis());

  digitalWrite(5, HIGH);
  digitalWrite(15, HIGH);
  delay(10);
  digitalWrite(5, LOW);
  digitalWrite(15, LOW);
   
}

Any thoughts?