STM32 hello world

gistfile1.c

#include "stm32f10x.h"                                                         
                                                                                
int main(void) {                                                                
  int delay;                                                                    
                                                                                
  // Enable the clock for port C gpio                                           
  RCC->APB2ENR |= RCC_APB2ENR_IOPCEN;                                           
  // Configure port C, pin 8 as a push pull output                              
  GPIOC->CRH = (GPIOC->CRH & 0xFFFFFFF0) | 0x00000002;
  
  for(;;){                                                                      
    // Set the LED as on for 500k cycles                                        
    for(delay = 0; delay < 500000; delay++) {                                   
      GPIOC->BSRR = (1 << 8);                                                   
    }                                                                           
    // Set the LED as off for 500k cycles                                       
    for(delay = 0; delay < 500000; delay++) {                                   
      GPIOC->BRR = (1 << 8);                                                    
    }                                                                           
  }                                                                             
}