菜鸟跪求大神帮忙，跑马灯程序下载到板子里，板子的灯不亮板子是stm32f407vet

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大碴子味|

楼主 | 2018-7-31 13:44 | 只看该作者回帖奖励

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stm32f407, 跑马灯程序, IO, pi, GPIO

#include <stm32f4xx.h>
uint32_t Gb_TimingDelay=100;
void  Delay(uint32_t nTime);
int  main ()
{
SysTick_Config(SystemCoreClock/1000);  // 设置 systemtick 一毫秒中断

RCC->AHB1ENR|=  0x00000008; // 使能GPIOD 时钟
RCC->APB2ENR|=  (1<<14);  // 使能syscfg 时钟

GPIOD->MODER&=0x00FFFFFF; // 设置 PD12,13,14,15 输出
GPIOD->MODER|=0x55000000;

GPIOD->OTYPER&=0xFFFF0FFF; // 设置PD12,13,14,15 推挽输
GPIOD->OSPEEDR&=0x00FFFFFF;  //PD12,13,14,15  速度100m
GPIOD->OSPEEDR|=0xff000000;

SYSCFG->CMPCR=0x00000001; // 使用IO 补偿单元，
// 当GPIO速度超过 50M 的时候要考虑使用此设置

GPIOD-&gtUPDR&=0x00FFFFFF; //PD12,13,14,15 无上拉无下拉

GPIOD->BSRRH=0xf000;//reset  register GPIOx_BSRRH,  write only
//set register GPIOx_BSRRL,  write only
while(1)
{
  GPIOD->BSRRH=0xf000;
  GPIOD->BSRRL=0x1000;
  Delay(500);

  GPIOD->BSRRH=0xf000;
  GPIOD->BSRRL=0x1000<<1;
  Delay(500);

  GPIOD->BSRRH=0xf000;
  GPIOD->BSRRL=0x1000<<2;
  Delay(500);

  GPIOD->BSRRH=0xf000;
  GPIOD->BSRRL=0x1000<<3;
  Delay(500);
}
}
void Delay(uint32_t nTime)
{
Gb_TimingDelay=nTime;

while(Gb_TimingDelay!=0);
}

void SysTick_Handler(void)
{
if(Gb_TimingDelay!=0x00)
{
  Gb_TimingDelay -- ;
}
}

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