main.c

00001 
00002 #include <stm32f3_discovery.h>
00003 
00004 volatile  unsigned  sysTiming;
00005 volatile  unsigned  sysTicks = 0;
00006 
00007 void SysTick_Handler(void) {
00008         sysTicks++;
00009         if (sysTiming > 0) --sysTiming; 
00010 }
00011 
00012 void sysDelayMs(unsigned dly) {
00013     sysTiming = dly;
00014     while (sysTiming > 0) __wfi();
00015 
00016 }
00017 
00018 int main(void) {
00019     
00020     SysTick_Config((SystemCoreClock / 1000));
00021     RCC->AHBENR |= RCC_AHBPeriph_GPIOE | RCC_AHBPeriph_GPIOA;    
00022     GPIOE->MODER = (GPIOE->MODER&0xffff) | 0x55550000; // output mode for PE8-15
00023     GPIOA->MODER = (GPIOA->MODER&0xfffffffc)  ; // input mode for PA0
00024 
00025     GPIOE->BSRR=0xff00;
00026     sysDelayMs(500);
00027     int b=0;
00028     while(1) {
00029         GPIOE->BSRR=1<<(b+8);
00030         while(GPIOA->IDR&1);
00031         sysDelayMs(100);
00032         GPIOE->BSRR=1<<(b+8+16);
00033         b=(b+1)%8;
00034     }
00035 }
00036 
00037