赏析之 M3按键中断控制LED显示 (11)

程序描述：
         外部按键 KEY1 KEY2 控制 LED 显示
整个工程代码： 4_key_irq_led.rar  

/*
*    Author :        yuweixian
*    Date:          2011.6.21
*
*   Description:
*          开发板上： PA15  - KEY1
*                     PA13  - KEY2
*          key.h 包含了  按键输入初始化
                         stm32 内核NVIC 配置中断线
                         stm32 中断使能 EXTI
*/

#ifndef __KEY_H
#define __KEY_H

#include "stm32f10x_gpio.h"
#include "stm32f10x_type.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_nvic.h"
#include "stm32f10x_flash.h"
#include "stm32f10x_map.h"

void key_init(void);    //按键初始化
void Key_EXTI_Configuration(void);    // 中断使能
void Key_NVIC_Configuration(void);// 内核选择 中断线

#endif

#include "key.h"

void key_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    //初始化 KEY2 PA13
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //KEY2
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;    //上拉
    GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化 设置PA13

    //初始化 KEY1 PA15
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;    //上拉
    GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化 设置PA15
}

void Key_EXTI_Configuration(void)
{
    EXTI_InitTypeDef  EXTI_InitStructure; //EXTI初始化结构体定义

    EXTI_ClearITPendingBit(EXTI_Line13); //清除中断13标志
    EXTI_ClearITPendingBit(EXTI_Line15); //清除中断15标志

    //初始化 PA13
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource13);//选择中断管脚PA13 KEY2

    EXTI_InitStructure.EXTI_Line = EXTI_Line13; //线路选择 中断通道13
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//设置为中断请求，非事件选择
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿触发
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;//中断线使能
    EXTI_Init(&EXTI_InitStructure); //初始化中断

    //初始化 PA15
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource15);//选择中断管脚PA15 KEY1

    EXTI_InitStructure.EXTI_Line = EXTI_Line15; //线路选择 中断通道13
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//设置为中断请求，非事件选择
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿触发
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;//中断线使能
    EXTI_Init(&EXTI_InitStructure); //初始化中断
}


void Key_NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM
  /* Set the Vector Table base location at 0x20000000 */
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);

#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

#endif

    //选择中断分组2
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    //允许 EXTI15_10中断
    NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQChannel;//选择10-15中断通道
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //抢占式中断优先级设置为 1
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//响应式中断优先级设置为 0
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    //使能中断
    NVIC_Init(&NVIC_InitStructure);      //使能中断
}