ESP32 Forum

Good afternoon, I need to program an ESP32S3 with the Arduino environment but I want to program it from the USB pins because I need the UART ports available, and I also need the USB port to receive and send data with the 3 UART ports. thank you so much. I attach a code that I already have but it does not work correctly

#include <Arduino.h>

void setup() {
// Initialize USB communication (Serial)
Serial.begin(115200); // USB port at 115200 bps

// Initialize UART0, UART1, and UART2
Serial1.begin(9600, SERIAL_8N1, 16, 17); // UART0 on pins 16 (RX) and 17 (TX)
Serial2.begin(9600, SERIAL_8N1, 18, 19); // UART1 on pins 18 (RX) and 19 (TX)
Serial3.begin(9600, SERIAL_8N1, 22, 23); // UART2 on pins 22 (RX) and 23 (TX)
}

void loop() {
// Read data from the USB port and send it to UART0
if (Serial.available()) {
char incomingByte = Serial.read();
Serial1.write(incomingByte);
}

// Read data from UART0 and send it to the USB port
if (Serial1.available()) {
char incomingByte = Serial1.read();
Serial.write(incomingByte);
}

// Similar for UART1 and UART2
if (Serial2.available()) {
char incomingByte = Serial2.read();
Serial.write(incomingByte);
}

if (Serial3.available()) {
char incomingByte = Serial3.read();
Serial.write(incomingByte);
}
}

You can edit your code like this: The while (!USBSerial) line ensures that the code waits for the USB connection to be established before moving forward. You have to enable USB CDC on boot and select the correct board settings for ESP32-S3.
You will program the ESP32-S3 via its native USB port (D+ and D-), and the UARTs will work independently for your other communication needs.

Note that using a while !USBSerial loop like that means that it WILL wait for the USB to establish. If there is no host there, the device will appear hung.