STM32F4点亮LED操作代码(寄存器版)

#include"stdint.h"

#include"stm32f4xx.h"

int main(void){

int32_t  i ;

/* Setup the microcontroller system. Initialize the Embedded Flash Interface,

     initialize the PLL and update the SystemFrequency variable. */

 SystemInit();//IN FILE system_stm32f10x.c,FOR clock setup etc

 

 RCC->AHB1ENR=0x00701019; //初始化使能时钟

 

 GPIOA->MODER  = 0x6aa99559;  //对A组IO口进行模式选择，输出模式，参考MODER寄存器

 GPIOA->OTYPER = 0x00000000;  //对A组IO口进行类型选择，推完输出，参考OTYPER寄存器

 GPIOA->OSPEEDR = 0x15444000; //对A组IO口进行速度选择，参考OSPEEDR寄存器

 GPIOA->PUPDR = 0x25500000;   //对A组IO口进行上拉、下拉选择，参考PUPDR寄存器

 GPIOA->AFR[0] = 0xb00000b0;  //对A组IO口进行模式选择

 GPIOA->AFR[1] = 0x00099770 ; //对A组IO口进行模式选择

//对E组IO口进行初始化，同A

 GPIOE->MODER=0x00001554;

 GPIOE->OTYPER=0x00000000;

 GPIOE->OSPEEDR=0x00002AA8;

 GPIOE->PUPDR=0x00002AA8;

//对D组IO口进行初始化，同A

 GPIOD->MODER=0X00400000;

 GPIOD->OTYPER=0x00000000;

 GPIOD->OSPEEDR=0x00800000;

 GPIOD->PUPDR=0x00800000;

 

//设置程序死循环

 for(;;)

 {

   //点亮相应LED

   for(i =0;i<5000;i++)

   {

     GPIOE->BSRR=0x0000007E;

     GPIOD->BSRR=0x00000800;

     GPIOA->BSRR=0x0000000C;

    }

   

//熄灭相应LED

   for(i =0;i<5000;i++)

   {

    GPIOE->BSRR=0x007E0000;

    GPIOD->BSRR=0x08000000;

    GPIOA->BSRR=0x000C0000;

    }

  }

}