STM32单片机入门学习（五）-按钮控制LED

按钮和LED接线

LED负极接B12,正极接VCC

按钮一端接B13,一端接GND，按下为低电平，松开为高电平

如图：

主程序代码：main.c

#include "stm32f10x.h"
#include "Delay.h"     //delay函数所在头文件
#include "LED.h"
#include "KEY.h"int main(void)
{int isdown;LED_Init();   //初始化LEDLED_OFF();		//默认LED灭KEY_Init(); 	//初始化KEYwhile(1){isdown  = Key_IsDown();	//循环判断按钮是否被按下if(isdown == 1){LED_ON();}else{LED_OFF();}}
}

LED.h和LED.c

LED.h

#ifndef __LED_H
#define __LED_Hvoid LED_Init(void);
void LED_ON(void);
void LED_OFF(void);#endif

LED.c

#include "stm32f10x.h"void LED_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //设置时钟GPIO_InitTypeDef GPIOInitStruct;GPIOInitStruct.GPIO_Mode = GPIO_Mode_Out_PP;    //推挽模式GPIOInitStruct.GPIO_Pin = GPIO_Pin_12;     //B12GPIOInitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIOInitStruct);GPIO_SetBits(GPIOB, GPIO_Pin_12); // 不亮}void LED_ON(void)
{GPIO_ResetBits(GPIOB, GPIO_Pin_12); // 亮
}void LED_OFF(void)
{GPIO_SetBits(GPIOB, GPIO_Pin_12); // 不亮
}

KEY.h和KEY.c

KEY.h

#ifndef __KEY_H
#define __KEY_Hvoid KEY_Init(void);
unsigned char Key_IsDown(void);#endif

KEY.c

#include "stm32f10x.h"
#include "Delay.h" //初始化KEY
void KEY_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //设置时钟GPIO_InitTypeDef GPIOInitStruct;GPIOInitStruct.GPIO_Mode = GPIO_Mode_IPU;    //上拉模式GPIOInitStruct.GPIO_Pin = GPIO_Pin_13;     //B13GPIOInitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIOInitStruct);
}//判断key是否被按下
uint8_t Key_IsDown(void)
{uint8_t isdown = 0;if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_13) == 0)   //判断是否按下{Delay_ms(20);    //消抖if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_13) == 0)    //判断是否确实被按钮{isdown = 1;}else{isdown = 0;}}else{isdown = 0;}return isdown;
;
}