ESP32-S3 Can't get second UART to work - Help !

[okeefe]

I have an ESP32-S3 board and I can not get a second serial UART to work. The main UART0 on USB is fine but when I define a second serial UART and specify the GPIO pins, it does not work.
The test code looks like this...

  #include "Arduino.h"
//---[ VARIABLE DEFINITIONS ]----------------------------
  int   x = 0;
  int   y = 0;
  int   i = 0;
  int loopcount = 0;
//---[ SETUP ]-------------------------------------------
void setup() {
    Serial.begin(115200);
    Serial1.begin(9600, SERIAL_8N1, 18, 17);  // Speed, Mode, Rx pin, Tx pin
    Serial2.begin(9600, SERIAL_8N1, 10, 11);  // Speed, Mode, Rx pin, Tx pin
    //Serial1.begin(9600,SERIAL_8N1,dcn_in_pin,dcn_out_pin);
    pinMode(17,OUTPUT);
    pinMode(18,INPUT);
    pinMode(11,OUTPUT);
    pinMode(10,INPUT);
    
    pinMode(7,OUTPUT);
}

//---[ MAIN PROGRAM LOOP ]--------------------------------
void loop() {
  loopcount++;
//----------------------------------
  Serial.println("--------------------------------------");
  Serial.println("Hello SERIAL from ESP32-S3  Pass " + String(loopcount));
  Serial1.println("Hello SERIAL1 from ESP32-S3  Pass " + String(loopcount)); 
  Serial2.println("Hello SERIAL2 from ESP32-S3  Pass " + String(loopcount)); 
  digitalWrite(7,HIGH);
  delay(1000);
//----------------------------------
  digitalWrite(7,LOW);
  delay(1000);
}

Has anyone gotten a second UART to work on the ESP32-S3?
Thanks
George

[sonofcy]

Check the migration document, I see it mentions UART. OR just roll back your ESP32 board file to 2.0.17.

[okeefe]

Thanks for the suggestion. I don't know how to do the rollback. Do you mean use Arduino IDE rev 2.0.17 ?

[sonofcy]

NO the boards entry for esp32 by Espressif, see pic

[okeefe]

Thanks ! I will give that a try.

[okeefe]

Sadly, no joy. Thanks for the suggestion. I have to think someone out there has tried to use a second serial port on an ESP32-S3 with the Arduino IDE.
All suggestions are welcome.

[jremington]

Try this. Note that UART default pins may be used for other purposes.

There is some confusion on that web page about the number of UARTs in the S3.

[okeefe]

Thanks. I read through that before I posted my problem.
I just finally figured it out. Actually a friend did. He said to try commenting out the pin direction definitions. That worked.
I am pretty sure I defined the UART input or output direction on other projects but in this case, eliminating the pinMode commands on the UART pins made it work.
Go figure !

[gfvalvo]

@okeefe

    pinMode(17,OUTPUT);
    pinMode(18,INPUT);
    pinMode(11,OUTPUT);
    pinMode(10,INPUT);

@okeefe

I am pretty sure I defined the UART input or output direction on other projects but in this case, eliminating the pinMode commands on the UART pins made it work.

Nope, I doubt redefining the pin functions after calling Serialx.begin() ever worked.

It will reconfigure the internal Pin muxes and disconnect the UART.