#include "bluepill.h" #define LED_PIN 13 // void __attribute__ ((weak, naked)) reset_handler(void) { int main() { GPIO_C->enable_clock(); GPIO_C->pin_mode(LED_PIN, true, OUTPUT_GPP, OUTPUT_MAX_2MHZ); while(1) { GPIO_C->pin_clear(LED_PIN); delay(1000000); GPIO_C->pin_set(LED_PIN); delay(100000); GPIO_C->pin_clear(LED_PIN); delay(100000); GPIO_C->pin_set(LED_PIN); delay(100000); } }