STM32 外部中断的使用

作者：tkzsld（sky)
实验硬件：火牛开发板
硬件连接：指示灯连接PD9
按钮连接PA8
功能描述：本例程实现外部中断的输入试验，
按键次数 1：PD8 PD9ON2：PD8 PD9OFF
3：PD10 PD11ON4：PD10 PD11OFF
5：PD8-11ON6：PD8-11OFF
7: PB5 BEEP ON8 :BEEPOFF

********************************************************************/

#include <stm32f10x_lib.h>//STM32F10x Library Definitions
#include "STM32_Init.h"// STM32 Initialization
u8 flag=0;
void beep(void);
voidledblink(void);
void Delay(vu16 cnt) {
uint16 i,j;
for (i=0;i { for (j=0;j<1000;j++)
{ }
}
}

void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;

//使能外部晶振
RCC_HSEConfig(RCC_HSE_ON);
//等待外部晶振稳定
HSEStartUpStatus = RCC_WaitForHSEStartUp();
//如果外部晶振启动成功，则进行下一步操作
if(HSEStartUpStatus==SUCCESS)
{
//设置HCLK（AHB时钟）=SYSCLK
RCC_HCLKConfig(RCC_SYSCLK_Div1);

//PCLK1(APB1) = HCLK/2
RCC_PCLK1Config(RCC_HCLK_Div2);

//PCLK2(APB2) = HCLK
RCC_PCLK2Config(RCC_HCLK_Div1);


RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_4);
//启动PLL
RCC_PLLCmd(ENABLE);
//等待PLL稳定
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
//系统时钟SYSCLK来自PLL输出
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//切换时钟后等待系统时钟稳定
while(RCC_GetSYSCLKSource()!=0x08);
}

//给GPIOA和重映射提供时钟，注意：一定要设置RCC_APB2Periph_AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO , ENABLE);

}

void GPIO_Configuration(void)
{

GPIO_InitTypeDefGPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin= GPIO_Pin_9|GPIO_Pin_8|GPIO_Pin_10|GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode= GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin= GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode= GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

}

void EXTI_Configuration(void)
{
EXTI_InitTypeDefEXTI_InitStructure;

GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource8);
EXTI_ClearITPendingBit(EXTI_Line8);

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_Line =EXTI_Line8;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#ifdefVECT_TAB_RAM

NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else

NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//抢占式优先级别设置为无抢占优先级

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;//指定中断源
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//指定响应优先级别1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道8
NVIC_Init(&NVIC_InitStructure);
// EXTI_GenerateSWInterrupt(EXTI_Line8);
}

int main (void)
{

RCC_Configuration();//配置时钟
GPIO_Configuration(); //配置IO口
NVIC_Configuration(); //中断配置
EXTI_Configuration(); //外部中断配置
while(1)
{
switch(flag)
{
case 0: GPIO_WriteBit(GPIOD, GPIO_Pin_8|GPIO_Pin_9,(BitAction)1);break;
//Delay(1000);
case 1: GPIO_WriteBit(GPIOD, GPIO_Pin_9|GPIO_Pin_8,(BitAction)0);break;
//Delay(1000);
case 2: GPIO_WriteBit(GPIOD, GPIO_Pin_10|GPIO_Pin_11,(BitAction)1); break;
case 3: GPIO_WriteBit(GPIOD, GPIO_Pin_10|GPIO_Pin_11,(BitAction)0);break;

case 4: GPIO_WriteBit(GPIOD, GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11,(BitAction)1);break;
case 5: GPIO_WriteBit(GPIOD, GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11,(BitAction)0);break;

case 6: beep();break;
case 7: ledblink();break;
case 8: GPIO_WriteBit(GPIOB, GPIO_Pin_5,(BitAction)0);break;
default: flag=0;break;
}
}
}

void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line8) != RESET)
{
Delay(100);
if(EXTI_GetITStatus(EXTI_Line8) != RESET)
{
//添加中断处理程序
flag++;
EXTI_ClearFlag(EXTI_Line8);//清除中断标志（必须）
//EXTI_ClearITPendingBit(EXTI_Line8);
}
}
}

void ledblink()
{
u16 k;
for(k=0;k<100;k=k+5)
{
GPIO_WriteBit(GPIOD, GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11,(BitAction)1);
Delay(1000);
GPIO_WriteBit(GPIOD, GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11,(BitAction)0);
Delay(1000);
}
}

void beep(void)
{

GPIO_WriteBit(GPIOB, GPIO_Pin_5,(BitAction)1);
Delay(1000);
GPIO_WriteBit(GPIOB, GPIO_Pin_5,(BitAction)0);

}