Serial USARTs On STM32 Blue Pill With Arduino Code in PlatformIO

Here’s the “Hello World” edition of getting access to USART2 and USART3 on an STM32 Blue Pill in PlatformIO using the Arduino framework.

/* lib_deps = NONE
  # Using a library name

-------- Platform.ini Settings----------
[env:bluepill_f103c8]
platform = ststm32
board = bluepill_f103c8
#board = bluepill_f103c8
framework = arduino
upload_protocol = stlink
lib_compat_mode = soft

*/

#include "Arduino.h"
HardwareSerial Serial2(USART2);   // PA3  (RX)  PA2  (TX)
HardwareSerial Serial3(USART3); // PB11 (RX)  PB10   (TX)

void setup() {
Serial.begin(19200);   // PA10  (RX) PA9 (TX) 
Serial2.begin(19200);  // PA3  (RX)  PA2  (TX)
Serial3.begin(19200);  // PB11 (RX)  PB10   (TX)

Serial.println("Serial: 1");
Serial2.println("Serial2: 2");
Serial3.println("Serial3: 3");
}

void loop() {
Serial.println("Serial: 1");
Serial2.println("Serial2: 2");
Serial3.println("Serial3: 3");
delay(1000);
}