基于STM32实现流水灯【Proteus仿真】

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通过配置寄存器初始化LED：

代码：

//LED IO初始化void LED_Init(void){  RCC->APB2ENR|=1<<4;    //使能PORTC时钟  GPIOC->CRL&=0X00000000;//清零  GPIOC->CRL|=0X33333333;//推挽50MHz输出  GPIOC->ODR=0X00FF;      //输出高}

①CRL寄存器(端口配置低寄存器)：

②APB2外设时钟使能寄存器：

③ODR端口输出数据寄存器：

总结：

STM32每个IO端口都有7个寄存器控制：

1.两个32位端口配置寄存器-- CRL和CRH
2.两个32位数据寄存器-- IDR和ODR
3.一个32位置位/复位寄存器-- BSRR
4.一个16位复位寄存器-- BRR
5.一个32位锁存寄存器-- LCKR
主程序（main.c）:

#include "main.h"void KEY_IO_Init(void);//按键初始化
void EXTIx_Init(void);//外部中断
void EXTI0_IRQHandler(void);
void EXTI1_IRQHandler(void);
//LED IO初始化
void LED_Init(void)
{RCC->APB2ENR|=1<<4;    //使能PORTC时钟GPIOC->CRL&=0X00000000;//清零GPIOC->CRL|=0X33333333;//推挽50MHz输出GPIOC->ODR=0X00FF;      //输出高
}int main(void){uint8_t count_i;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//中断向量分组 2KEY_IO_Init();EXTIx_Init();//外部中断初始化while(1){  LED_Init();//初始化与LED连接IO口while(1){  }}return 0;
}void KEY_IO_Init(void)//按键初始化
{GPIO_InitTypeDef  GPIO_InitStructure;   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);   //使能PB端口时钟GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;         //按键输入端口配置GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;     GPIO_Init(GPIOB, &GPIO_InitStructure);  
}  
void EXTIx_Init(void)//外部中断
{NVIC_InitTypeDef NVIC_InitStructure;  //NVIC寄存器结构体变量EXTI_InitTypeDef EXTI_InitStructure;  //外部中断相关寄存器结构体变量RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能IO复用功能时钟GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0); //GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1); //GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource2); ////配置外部中断4相关寄存器EXTI_InitStructure.EXTI_Line = EXTI_Line0|EXTI_Line1|EXTI_Line2;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_Init(&EXTI_InitStructure);//中断通道使能NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//使能外部中断通道0NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //设置抢占优先级2NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;//设置响应优先级2NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);//中断通道使能NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;//使能外部中断通道1NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //设置抢占优先级2NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;//设置响应优先级2NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);//中断通道使能NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;//使能外部中断通道2NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //设置抢占优先级2NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;//设置响应优先级2NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);}void EXTI0_IRQHandler(void)
{int i;for(i=0;i<8;i++){GPIOC->ODR=~(1<<i);//输出低delay_ms(500);}GPIOC->ODR=0xff;EXTI_ClearITPendingBit(EXTI_Line4);//清除中断挂起标志位
}
void EXTI1_IRQHandler(void)
{int i;for(i=8;i>=0;i--){GPIOC->ODR=~(1<<i);//输出低delay_ms(500);}GPIOC->ODR=0xff;EXTI_ClearITPendingBit(EXTI_Line4);//清除中断挂起标志位
}