#include <stm32f10x.h>

#define LLG (1 << 0)
#define LG (1 << 1)
#define RG (1 << 2)
#define RRG (1 << 3)
#define LY (1 << 4)
#define RY (1 << 5)
#define LR (1 << 6)
#define RR (1 << 7)
#define OFF 8


void Delay(u32 uiTDel)
  {
    while (uiTDel--) {}
  }

    // ===== Function main() =================================================
int main(void)
{  	//  ?????????? ???????????? ????? ? ? ????? ?
    // (? (??????)??????? ???? ?????? ?? ?????? ?????????? ?????? User ? ???????)
  RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPCEN;

    //  ????????? ?????? "?????" ??? ??????????
  GPIOA->CRL = 0x33333333;  //  ????? PC8 - ??? ?????????? USER ?? Discovery
	char arr =
	{
	(LG|RR),
	(LY|RY),
	(LR|RG),
	(LY|RY),
	};

	char pos = 0;
	char prev = 0;
  while(1)
  {
		GPIOA->BSRR ^= arr[prev] << OFF;
		GPIOA->BSRR ^= arr[pos];
		Delay(1000000);
		prev = pos;
		pos = (++pos) % arr.size();
	}
//	return 0;
}