stm32按键的检测(EXTI和Polling两种方式)

好像很简单的，但...

EXTI Mode时，只要别漏下面这两行基本是没问题了.

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);    /* 复用时钟使能 */

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1); /* 选择GPIO管脚用作外部中断线路 */

#include <stm32f10x.h>

#include <rtthread.h>

#define EXTI_Trigger_Mode

#define KEY_RCC RCC_APB2Periph_GPIOB

#define KEY_GPIO GPIOB

#define KEY_PIN (GPIO_Pin_1)

#define KEY_LINE (EXTI_Line1)

#ifdef EXTI_Trigger_Mode

void rt_hw_key_gpio_init(void);

void rt_hw_key_exti_init(void);

void rt_hw_key_navi_init(void);

#else

void rt_key_polling_judge(void);

#endif

以上是.h文件内容

#include "key.h"

void rt_hw_key_gpio_init(void)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(KEY_RCC, ENABLE); 

    GPIO_InitStructure.GPIO_Pin = KEY_PIN;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

    GPIO_Init(KEY_GPIO,&GPIO_InitStructure);

}

#ifdef EXTI_Trigger_Mode

void rt_hw_key_exti_init(void)

{

    EXTI_InitTypeDef EXTI_InitStructure; 

    EXTI_InitStructure.EXTI_Line = KEY_LINE; 

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; 

    EXTI_InitStructure.EXTI_LineCmd = ENABLE; 

    EXTI_Init(&EXTI_InitStructure); 

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); 

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);

}

void rt_hw_key_navi_init(void)

{

    NVIC_InitTypeDef NVIC_InitStructure; 

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);  

    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; 

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; 

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; 

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 

    NVIC_Init(&NVIC_InitStructure);

}

void EXTI1_IRQHandler(void)

{

    if(EXTI_GetITStatus(KEY_LINE) == SET)

    {

        rt_kprintf("~~~~~~~~~~~~~~~~~~~~~~~~~~111~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n");

        EXTI_ClearFlag(KEY_LINE); 

    }

}

#else

void rt_key_polling_judge(void)

{

    while(1)

    {

        if(GPIO_ReadInputDataBit(KEY_GPIO,KEY_PIN) == 0)

        {

            rt_thread_delay(100);

            if(GPIO_ReadInputDataBit(KEY_GPIO,KEY_PIN) == 0)

            {

                rt_kprintf("~~~~~~~~~~~~~~~~~~~~~~~~~~222~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n");

            }

        }

    }

}

#endif

以上是.c的内容.