1、原理

电路图中相同网络标号表示它们是连接在一起，STM32F103ZET6的PC0-PC7 管脚连接D1-D8发光二极管阴极，如要使 D1 指示灯亮，只需控制 PC0 管脚输出低电平。

2、工程文件

Keil工程包含main.c、stm32f10x.h、startup_stm32f10x_hd.s三个文件

在这里插入图片描述

3、代码

[stm32f10x.h]

#define PERIPH_BASE        ((unsigned int)0x40000000)
#define APB2PERIPH_BASE    (PERIPH_BASE + 0x00010000)
#define GPIOC_BASE         (APB2PERIPH_BASE + 0x1000)
#define GPIOC_CRL 	 	   *(unsigned int*)(GPIOC_BASE+0x00)
#define GPIOC_CRH 	 	   *(unsigned int*)(GPIOC_BASE+0x04)
#define GPIOC_IDR 	 	   *(unsigned int*)(GPIOC_BASE+0x08)
#define GPIOC_ODR 	       *(unsigned int*)(GPIOC_BASE+0x0C)
#define GPIOC_BSRR 	       *(unsigned int*)(GPIOC_BASE+0x10)
#define GPIOC_BRR 	 	   *(unsigned int*)(GPIOC_BASE+0x14)
#define GPIOC_LCKR 	 	   *(unsigned int*)(GPIOC_BASE+0x18)
#define AHBPERIPH_BASE     (PERIPH_BASE + 0x20000)
#define RCC_BASE 		   (AHBPERIPH_BASE + 0x1000)
#define RCC_APB2ENR 	   *(unsigned int*)(RCC_BASE+0x18)

[main.c]

#include "stm32f10x.h"

typedef unsigned int u32;

void SystemInit()
{

}

void delay(u32 i)
{
  while(i--);
}

int main()
{
  int i,j,k;//此处应用整型变量，否则循环判断出错
  //1.开启GPIOC外设时钟  PC在第4位
  RCC_APB2ENR |=1<<4;
  while(1)
  {
    for(i=0; i<8; i++)
    {
      GPIOC_CRL &=~((0x0f)<<(4*i));//2.设置端口模式 低四位清零 0x0f =0000 1111
      GPIOC_CRL |=3<<(4*i);//0011 推挽输出，50M
      //3.设置BSRR以达到控制数据位，点亮LED
      GPIOC_BSRR=1<<(16+i);//点亮LED
      delay(0xfffff); //最大8个f
      GPIOC_BSRR=1<<(0+i);//熄灭LED
      delay(0xfffff);
    }
    for(j=7; j>=0; j--)
    {
      GPIOC_CRL &=~((0x0f)<<(4*j));
      GPIOC_CRL |=3<<(4*j);
      GPIOC_BSRR=1<<(16+j);
      delay(0xfffff);
      GPIOC_BSRR=1<<(0+j);
      delay(0xfffff);
    }
    for(k=0; k<8; k++)
    {
      GPIOC_CRL &=~((0x0f)<<(4*k));
      GPIOC_CRL |=3<<(4*k);
      GPIOC_BSRR=1<<(16+k);
      delay(0xfffff);
      GPIOC_BSRR=1<<(0+k);
      delay(0xfffff);
    }
  }
}