99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
#include "Key.h"
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#include "Delay.h"
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#include "bsp_usart.h"
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u8 flag = 0;
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/**-------------------------------------------------------
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* @函数名 KEY_INIT
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* @功能 按键初始化
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* @返回值 无
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***------------------------------------------------------*/
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void KEY_INIT()
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{
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KEY_GPIO_INIT();
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KEY_NVIC_INIT();
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}
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/**-------------------------------------------------------
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* @函数名 KEY_GPIO_INIT
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* @功能 按键GPIO初始化
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* @返回值 无
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***------------------------------------------------------*/
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void KEY_GPIO_INIT(){
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(KEY_CLOCK, ENABLE); //使能对应端口时钟
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GPIO_InitStructure.GPIO_Pin = KEY_Pin;//KEY_Pin
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //设置成上拉输入
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GPIO_Init(KEY_PORT, &GPIO_InitStructure);//初始化key_GPIO
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}
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/**-------------------------------------------------------
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* @函数名 KEY_NVIC_INIT
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* @功能 按键按下时为低电平0
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* @返回值 无
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***------------------------------------------------------*/
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void KEY_NVIC_INIT()
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{
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EXTI_InitTypeDef EXTI_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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/* 初始化KEY按键为中断模式 */
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/* Connect Button EXTI Line to Button GPIO Pin */
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/* 将KEY按键对应的管脚连接到内部中断线 */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能复用功能时钟
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//GPIOE.2 中断线以及中断初始化配置 下降沿触发
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GPIO_EXTILineConfig(KEY_PORT_SOURCE,KEY_PIN_SOURCE);
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EXTI_InitStructure.EXTI_Line=KEY_EXIT_LINE; //KEY2
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
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/* Enable and set Button EXTI Interrupt to the lowest priority */
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NVIC_InitStructure.NVIC_IRQChannel = KEY_NVIC_IRQChannel; //使能按键WK_UP所在的外部中断通道
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02; //抢占优先级2，
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00; //子优先级0
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
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NVIC_Init(&NVIC_InitStructure);
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}
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/**-------------------------------------------------------
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* @函数名 EXTI3_IRQHandler
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* @功能 处理外部中断线3的中断，按键1中断处理函数
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* @参数 无
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* @返回值 无
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***------------------------------------------------------*/
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void KEY_NVIC_Handler(void) /* Key 1 */
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{
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if(EXTI_GetITStatus(KEY_EXIT_LINE) != RESET)
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{
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/* 延迟去抖 */
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delay(150);
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if(KEY == 0)
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{
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/* 改变指示灯状态 */
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flag = !flag;
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printf("\r\n开关状态改变为：%d\r\n",!flag);
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}
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/* 等待按键释放 */
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while(KEY == 0);
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/* 延迟去抖 */
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delay(150);
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/* Clear the EXTI Line 4 */
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/* 清除中断挂起标志位，否则会被认为中断没有被处理而循环再次进入中断 */
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EXTI_ClearITPendingBit(KEY_EXIT_LINE);
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}
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}
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