电赛菜鸟营培训（二）——STM32F103CB之中断控制

一、中断的概念

中断可以理解为一个有激励给它就会立马给你响应的一个东东。就是说在你执行main函数的内容时，当有这个触发时便会跳转到这个中断内存，执行这段代码。

Attention:

1、中断的用法，可以使用中断作为第二main函数，但是前提是必须中断代码的时间复杂度要远远低于main，才可以这样做。

2、中断也分优先级，也有中断的嵌套，这个需要根据相关的芯片去查对应的数据手册即可。

二、按键中断

1、使用按键控制LED灯的亮灭

#include "stm32f10x.h"

unsigned char i=0;

int main()
{
    GPIO_InitTypeDef GPIO_InitStructure;    //配置IO口结构体
    NVIC_InitTypeDef NVIC_InitStructure;          

    EXTI_InitTypeDef EXTI_InitStructure;     

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_15;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
  NVIC_InitStructure.NVIC_IRQChannel=EXTI15_10_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;             

  NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource15);
  EXTI_InitStructure.EXTI_Line=EXTI_Line15;                  

  EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd=ENABLE;
  EXTI_Init(&EXTI_InitStructure);                                               

    GPIO_SetBits(GPIOA, GPIO_Pin_0);

  while(1)
  {
  }
}

void EXTI15_10_IRQHandler()
{
  if(EXTI_GetITStatus(EXTI_Line15)!=RESET)
  {
    GPIO_ResetBits(GPIOA, GPIO_Pin_0);
    EXTI_ClearITPendingBit(EXTI_Line15);
  }
}

由于备注，我实在是受不了乱码问题，所以直接附图。

三、定时器中断

#include "stm32f10x.h"

unsigned char i=0;

int main()
{
    GPIO_InitTypeDef GPIO_InitStructure;
                NVIC_InitTypeDef NVIC_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

                RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;         //ÕâÒ»ÐÐÖеÄËٶȻù±¾ÎÞÓ°Ïì
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_15;
                GPIO_Init(GPIOA, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
  NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
  NVIC_Init(&NVIC_InitStructure);

 TIM_TimeBaseStructure.TIM_Period=10000;
  TIM_TimeBaseStructure.TIM_Prescaler=7199;
  TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  TIM_ITConfig(TIM3,TIM_IT_Update|TIM_IT_Trigger,ENABLE);
  TIM_Cmd(TIM3, ENABLE);
  GPIO_SetBits(GPIOA, GPIO_Pin_0);

  while(1)
  {
  }
}

void TIM3_IRQHandler()
{
  if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET)
  {
    TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    {
      i=1;
      GPIO_SetBits(GPIOA,GPIO_Pin_0);
    }
    else if(i==1)
    {
      i=0;
      GPIO_ResetBits(GPIOA,GPIO_Pin_0);
    }
  }
}