main.c_ver2

#include <stm32f10x.h>
#include <stm32f10x_rcc.h>
#include <stm32f10x_gpio.h>
void delay(volatile uint32_t nCount) {
    for (; nCount != 0; nCount--);
}
int i;
void main(void)
{
  RCC->APB2ENR|=RCC_APB2ENR_IOPCEN;
  GPIOC->CRH=0x80200000;
   for(i=1;i!=0;i++){
  if(GPIOC->IDR&GPIO_IDR_IDR15)GPIOC->BRR|=GPIO_BSRR_BR13;
  else
    GPIOC->BSRR=GPIO_BSRR_BS13;
  }
}