Receiving no data from serial connectionc

Projects Programming
1

Board: ESP32-EVB

I am trying to read data from a Radar's RS232 Interface through the UEXT connector on the ESP.

As per the schematics, I am using GPIO 36 as the rxPin and GPIO 4 as the txPin.

HardwareSerial USE_SERIAL1(1);

#define RX1 36
#define TX1 4

void setup() {
  delay(100);
  Serial.begin(115200);
  delay(1000);
  USE_SERIAL1.begin(9600, SERIAL_8N1, RX1, TX1);
}

void loop() {
  // Check if we are receiving data
  if(USE_SERIAL1.available() >0) {
    Serial.println("USE_SERIAL1 is available.");
    while (USE_SERIAL1.available()) {
      char c = char(USE_SERIAL1.read());
      Radar_String += c;
      Serial.print(char(USE_SERIAL1.read()));
    }
    Serial.println("Radar_String = " + Radar_String);
}

The radar is set up to send data on 9600.

I'm receiving no data. Not even Serial.println("Serial2 is available.");.

Any thoughts ?

2

Hi there.

That behavior is obvious because you have set your radar to buad rate of '9600'.

But in code you have mentioned

Serial.begin(115200);

rather the correct one should be

Serial.begin(9600);

The baud rate should match in order to do serial communication.