How to use Serial2

[nopnop2002]

I found this section on your boards.txt.

# NUCLEO_F103RB board
# Support: Serial1 (USART1 on PA10, PA9) and Serial2 (USART3 on PC11, PC10)

I tried Serial2.
But Serial2.println() output to Arduino-IDE Monitor.
I want to output like this.
To Arduino-IDE using Serial.
To PC10 using Serial2.

Code:

void setup() {

  Serial.begin(115200);
  Serial2.begin(115200);
  Serial.println("setup() start");
  Serial2.println("Serial2 setup() start");

  while (1) {
    Serial.println("setup alive...");
    Serial2.println("Serial2 setup alive...");
    delay(1000);
  }
}

void loop() {
  // Not used.
}

My setting:

Result:

[fpistm]

Hum in fact, this is not right, copy/paste mistake.
By default Serial is mapped to Serial2 on PA3/PA2.

Arduino_Core_STM32/variants/NUCLEO_F103RB/variant.h

Lines 114 to 119 in c153f5f

	// UART Definitions
	#define SERIAL_UART_INSTANCE 2 //Connected to ST-Link
	// Default pin used for 'Serial' instance (ex: ST-Link)
	// Mandatory for Firmata
	#define PIN_SERIAL_RX 0
	#define PIN_SERIAL_TX 1

Other U(S)ART possibility are here:

Arduino_Core_STM32/variants/NUCLEO_F103RB/PeripheralPins.c

Lines 158 to 178 in c153f5f

	#ifdef HAL_UART_MODULE_ENABLED
	const PinMap PinMap_UART_TX[] = {
	{PA_2, USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, AFIO_NONE)},
	{PA_9, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, AFIO_NONE)},
	{PB_6, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, AFIO_USART1_ENABLE)},
	{PB_10, USART3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, AFIO_NONE)},
	{PC_10, USART3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, AFIO_USART3_PARTIAL)},
	{NC, NP, 0}
	};
	#endif
	#ifdef HAL_UART_MODULE_ENABLED
	const PinMap PinMap_UART_RX[] = {
	{PA_3, USART2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_PULLUP, AFIO_NONE)},
	{PA_10, USART1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_PULLUP, AFIO_NONE)},
	{PB_7, USART1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_PULLUP, AFIO_USART1_ENABLE)},
	{PB_11, USART3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_PULLUP, AFIO_NONE)},
	{PC_11, USART3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_PULLUP, AFIO_USART3_PARTIAL)},
	{NC, NP, 0}
	};
	#endif

Some info:
https://github.com/stm32duino/wiki/wiki/API#hardwareserial

[nopnop2002]

Serial1 seems to work right.
I confirm that Serial1.println() output to PA9.

My code:

HardwareSerial Serial1(PA10, PA9);

void setup() {

  Serial.begin(115200);
  Serial1.begin(115200);
  Serial.println("setup() start");
  Serial1.println("Serial1 setup() start");

  while (1) {
    Serial.println("setup alive...");
    Serial1.println("Serial1 setup alive...");
    delay(1000);
  }
}

void loop() {
  // Not used.
}

Thank you.