Stm32按键和输出差不多

PA1为LED供给正电，PB5放置按键，按键一端接PB5,另一端接负极

void Key_Init(void){
	   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //APB2总线连接着GPIOB
	   GPIO_InitStructur.GPIO_Mode = GPIO_Mode_IPU;
	   GPIO_InitStructur.GPIO_Pin = GPIO_Pin_5;
	   GPIO_InitStructur.GPIO_Speed = GPIO_Speed_50MHz;
	   GPIO_Init(GPIOB, &GPIO_InitStructur);//写入
}

初始化为上拉输入输入HZ不用管，GPIOA和GPIOB都连接在APB2总线上，开启对应时钟才能进一步使用

这里初始化PB5为输入，PB3不知道啥原因不能作为输入端口

读输入值

GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_5)

这个函数返回的是一个uint8_t范围为[0 ~ 255),一般用它装小范围的int类型数据

按键扫描代码

uint8_t check(void){
	  uint8_t keynum = 0;//初始化0
	  if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_5) == 0){
			 Delay_ms(10);//消抖
			 while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_5) == 0);//等待松按键
			 keynum = 1;
		}
		return keynum;//记得返回值
}

完整代码

#include "stm32f10x.h"    // Device header
#include "Delay.h"

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructuer;//结构体
GPIO_InitTypeDef GPIO_InitStructur;//定义变量结构体



void GPIOA_Init(void){
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	GPIO_InitStructur.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructur.GPIO_Pin = GPIO_Pin_0;		//GPIO_Pin_15;
	GPIO_InitStructur.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructur);
}



void PWM_Init(void){ //pwm波形配置
	   TIM_OCStructInit(&TIM_OCInitStructuer);//给不需要配置的结构体成员赋予初始值
	   TIM_OCInitStructuer.TIM_OCMode = TIM_OCMode_PWM1; //输出比较模式
	   TIM_OCInitStructuer.TIM_OCPolarity = TIM_OCPolarity_High; //极性
	   TIM_OCInitStructuer.TIM_OutputState = TIM_OutputState_Enable; //输出使能
	   TIM_OCInitStructuer.TIM_Pulse = 0; //CCR,频率1kHZ,占空比50%的PWM波形
	   TIM_OC1Init(TIM2, &TIM_OCInitStructuer);//配置GPIOA端口通道
}

/*定时器定时中断代码*/

void Timer_Init(void)//使用TM2定时器
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	GPIOA_Init();
	
	TIM_InternalClockConfig(TIM2);
	
	 
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 100 - 1; //ARR
	TIM_TimeBaseInitStructure.TIM_Prescaler = 720 - 1; //PSC
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	
	
	PWM_Init();
	 
	
	TIM_Cmd(TIM2, ENABLE);//启动定时器
}

/*CCR控制灯的亮度在运行过程中不断更改CCR的值来达到呼吸效果*/ //CCR[0~100]值越大灯越亮



void PWM_setcompare1(uint16_t compare){
	   TIM_SetCompare1(TIM2, compare);
}

uint8_t i;
uint8_t j;

void Led_light(void){
	  
   for(j = 0; j < 3; j ++){     	
	   for(i = 0; i <= 100; i ++){
			   PWM_setcompare1(i);
			   Delay_ms(8);
		 }
		 for(i = 0; i <= 100; i ++){
			   PWM_setcompare1(100 - i);
			   Delay_ms(8);
		 }
	}
		 
}

void Key_Init(void){
	   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //APB2总线连接着GPIOB
	   GPIO_InitStructur.GPIO_Mode = GPIO_Mode_IPU;
	   GPIO_InitStructur.GPIO_Pin = GPIO_Pin_5;
	   GPIO_InitStructur.GPIO_Speed = GPIO_Speed_50MHz;
	   GPIO_Init(GPIOB, &GPIO_InitStructur);//写入
}

uint8_t check(void){
	  uint8_t keynum = 0;//初始化0
	  if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_5) == 0){
			 Delay_ms(10);//消抖
			 while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_5) == 0);//等待松按键
			 keynum = 1;
		}
		return keynum;//记得返回值
}
 
	
int main(void){
	Timer_Init();
  Key_Init();
	while(1){
       if(check() == 1){
			    Led_light();
			 }
	}
}

效果：按一下按键松开，Led呼吸三次