Custom ESP32-S3-WROOM-1 Board UART/Serial Issue

[gavinbrown]

Hi all,

I'm porting my successful custom Teensy 3.2 board across to an ESP32-S3-WROOM-1 processor. I have attached an L80 GPS TX to the ESP32S3 pin 11 (RX) and L80 GPS RX to the ESP32S3 pin 10 (TX).

I am using the following very simple code to test the output of the L80 GPS:

#include <HardwareSerial.h>

HardwareSerial MySerial(2);  // Using UART 2 with custom pins 
const int MySerialRX = 11;
const int MySerialTX = 10;
#define BAUD 9600

void setup() 
{
    Serial.begin(115200);
    MySerial.begin(BAUD, SERIAL_8N1, MySerialRX, MySerialTX);
    Serial.println("Setup Finished");
}


void loop() 
{
    while (MySerial.available() > 0) {
        char byteFromSerial = MySerial.read();
        Serial.write(byteFromSerial);
    }
}

Unfortunately I am only receiving the inverted ? symbol � as characters. I have tried all baud rates and have even changed gps modules with the same effect.

Am I doing something wrong in setting up the serial port?

Any help is greatly appreciated.

[Railroader]

Did You connect their GNDs too?
Schematics might be interesting.
Several GPS devices tell 4800 in the documentation but the circuits use 9600...

[jim-p]

Rather than doing a Serial.write do a Serial.println

[gavinbrown]

Hi all, thanks for your replies... ESP32S3 newbie issue... The pins on the chip do not reflect the pin numbers/GPOI's in Arduino. Now I have that sorted I have solved all of my issues...

Thanks again for your help.