（1）非中断按键点灯 ，弹起阻塞（天空星的用户按键为PA0，按下高电平，不按下低电平，含有硬件消抖）
/*
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* 开发板官网：www.lckfb.com
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* 不靠卖板赚钱，以培养中国工程师为己任
*/
#include "board.h"
#include "bsp_uart.h"
#include "stdio.h"
#include "sys.h"
#define key PAin(0)
#define led PBout(2)
int main(void)
{
board_init();
uart1_init(115200);
//1.初始化LED
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//2.初始化按键
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
while(1)
{
//3.检测到按键按下
if(key==1)
{
//4.按键延时消抖
delay_ms(20);
if(key==1)
led=!led;
//5.等待按键弹起
while(key==1);
}
}
}（2）按键中断点灯
/*
* 立创开发板软硬件资料与相关扩展板软硬件资料官网全部开源
* 开发板官网：www.lckfb.com
* 技术支持常驻论坛，任何技术问题欢迎随时交流学习
* 立创论坛：club.szlcsc.com
* 关注bilibili账号：【立创开发板】，掌握我们的最新动态！
* 不靠卖板赚钱，以培养中国工程师为己任
*/
#include "board.h"
#include "bsp_uart.h"
#include "stdio.h"
#include "sys.h"
#define key PAin(0)
#define led PBout(2)
int main(void)
{
board_init();
uart1_init(115200);
/*
//1.初始化LED
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//2.初始化按键
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
while(1)
{
//3.检测到按键按下
if(key==1)
{
//4.按键延时消抖
delay_ms(20);
if(key==1)
led=!led;
//5.等待按键弹起
while(key==1);
}
}
*/
//1.初始化LED
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//2.初始化按键
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//3.配置按键中断
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02; //串口从优先级0x01，这个配可以稍低
NVIC_Init(&NVIC_InitStructure);
//4.配置外部中断
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line=EXTI_Line0; //PA0所以选择EXTI_Line0
EXTI_InitStructure.EXTI_LineCmd=ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);
while(1)
{}
}
//5.中断处理函数
void EXTI0_IRQHandler(void)
{
//6.判断EXTI_Line0是否中断
if(EXTI_GetITStatus(EXTI_Line0)==SET)
{
//7.清除中断标志位
EXTI_ClearITPendingBit(EXTI_Line0);
//8.电平翻转
led=!led;
}
}
