Arduino for STM32

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//On-board LED pin number
#ifndef LED_BUILTIN
  #define LED_BUILTIN           PC9
#endif

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//On-board LED pin number
#ifndef LED_BUILTIN
  #define LED_BUILTIN PA5
#endif

// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a 1000 millisecond
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a 1000 millisecond
}

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digitalWrite(PAXX, ! digitalRead(PAXX));