STM32 Nucelo L432KC to GPS Output Not Displaying Data

[maxgerhardt]

@aguerrero1777

#define ss Serial2  // Use hardware Serial2 (PA10 RX, PA9 TX)

void setup() {
    Serial.begin(115200);  

No. That’s the same serial object. You’re making the same mistake as in

Arduino core for STM32 inconsistent serial port behaviour

I have a simple test project that interfaces with an UART device through the hardware serial port 2 of my STM32 Nucleo32 development kit (STM32L432). Here is my platformio.ini: [env:nucleo_l432kc] platform = ststm32 board = nucleo_l432kc framework = arduino build_flags = -D SERIAL_UART_INSTANCE=2 And here is my code: void setup() { pinMode(PA3, INPUT_PULLUP); Serial2.begin(9600); } void loop() { Serial2.print("AT\r"); delay(500); while (Serial2.available()) { ch…

You can see that you cannot independently use Serial and Serial2 becauase Serial is a macro for exactly Serial2. Just hover your mouse over the code.