STM32外部中断的小问题

只看该作者 · 2011-4-10 20:09

初次使用中断我本想设置两个按键。但是同样的中断函数，在PB4口可以，PB3口就不能使用。
程序如下：
#include "stm32f10x.h"

void RCC_Config(void);
  //时钟配置函数
void GPIO_Config(void);
  //I/O口配置函数
void EXIT_Config(void);
  //中断选择配置
void NVIC_Config(void);
  //中断优先级选择

void  Delay (u32 nCount)
{
  for(; nCount != 0; nCount--);
}

int main(void)
{

RCC_Config();

GPIO_Config();

EXIT_Config();

NVIC_Config();
while (1){

/*====LED1-ON=======*/

GPIO_SetBits(GPIOB , GPIO_Pin_6);

GPIO_ResetBits(GPIOB , GPIO_Pin_7);

GPIO_ResetBits(GPIOB , GPIO_Pin_8);

GPIO_ResetBits(GPIOB , GPIO_Pin_9);

Delay(0xfffff);

Delay(0xfffff);

Delay(0x5ffff);

/*====LED2-ON=======*/

GPIO_ResetBits(GPIOB , GPIO_Pin_6);

GPIO_SetBits(GPIOB , GPIO_Pin_7);

GPIO_ResetBits(GPIOE , GPIO_Pin_8);

GPIO_ResetBits(GPIOE , GPIO_Pin_9);

Delay(0xfffff);

Delay(0xfffff);

Delay(0x5ffff);

/*====LED3-ON=======*/

GPIO_ResetBits(GPIOB , GPIO_Pin_6);

GPIO_ResetBits(GPIOB , GPIO_Pin_7);

GPIO_SetBits(GPIOB , GPIO_Pin_8);

GPIO_ResetBits(GPIOB , GPIO_Pin_9);

Delay(0xfffff);

Delay(0xfffff);

Delay(0x5ffff);

/*====LED4-ON=======*/

GPIO_ResetBits(GPIOB , GPIO_Pin_6);

GPIO_ResetBits(GPIOB , GPIO_Pin_7);

GPIO_ResetBits(GPIOB , GPIO_Pin_8);

GPIO_SetBits(GPIOB , GPIO_Pin_9);

Delay(0xfffff);

Delay(0xfffff);

Delay(0x5ffff);

}
}

  /*设置I/O口使能时钟，配置I/O模式*/
void GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  /*使能AFIO复用I/O口的时钟*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE);

/**
*
LED1 -> PB6
,
LED2 -> PB7 , LED3 -> PB8 , LED4 -> PB9
KEY1  ->PB1
KEY2  ->PB2
*/

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 |GPIO_Pin_7 |GPIO_Pin_8 |GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);


  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void RCC_Config(void)
{

/*定义错误变量HSEStartUpStatus*/
ErrorStatus HSEStartUpStatus;

/* 这里是重置了RCC的设置，类似寄存器复位 */

RCC_DeInit();

/* 使能外部高速晶振 */
RCC_HSEConfig(RCC_HSE_ON);

/* 等待高速晶振稳定 */
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if (HSEStartUpStatus == SUCCESS)
{
   /* HCLK = SYSCLK 设置高速总线时钟=系统时钟*/

  RCC_HCLKConfig(RCC_SYSCLK_Div1);

   /* PCLK2 = HCLK 设置低速总线2时钟=高速总线时钟*/
   RCC_PCLK2Config(RCC_HCLK_Div1);

   /* PCLK1 = HCLK/2 设置低速总线1的时钟=高速时钟的二分频*/
   RCC_PCLK1Config(RCC_HCLK_Div2);

   /* ADCCLK = PCLK2/6 设置ADC外设时钟=低速总线2时钟的六分频*/
   RCC_ADCCLKConfig(RCC_PCLK2_Div6);

   /* 利用锁相环讲外部8Mhz晶振9倍频到72Mhz */
   RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

   /* Enable PLL 使能锁相环*/
   RCC_PLLCmd(ENABLE);

  /* Wait till PLL is ready 等待锁相环输出稳定*/
   while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
   {}

   /* Select PLL as system clock source 将锁相环输出设置为系统时钟 */
   RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

   /* Wait till PLL is used as system clock source 等待校验成功*/
   while (RCC_GetSYSCLKSource() != 0x08)
   {}
}
}

void EXIT_Config(void)
{
EXTI_InitTypeDef EXTI_InitStructure; //定义结构

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource4);

EXTI_ClearITPendingBit(EXTI_Line4);
EXTI_InitStructure.EXTI_Line = EXTI_Line4;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}

void NVIC_Config(void)
{

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //占先优先级、副优先级的资源分配

NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

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

#ifdef  USE_FULL_ASSERT

void assert_failed(uint8_t* file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
   ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

void EXTI4_IRQHandler(void)
{
if ( EXTI_GetITStatus(EXTI_Line4) != RESET ) {
   EXTI_ClearITPendingBit(EXTI_Line4);

   GPIO_ResetBits(GPIOB , GPIO_Pin_6);
   GPIO_ResetBits(GPIOB , GPIO_Pin_7);
   GPIO_ResetBits(GPIOB , GPIO_Pin_8);
   GPIO_ResetBits(GPIOB , GPIO_Pin_9);


Delay(0xfffff);

Delay(0xfffff);

Delay(0xfffff);

Delay(0xfffff);

Delay(0xfffff);

Delay(0xfffff);

}
}

这个是可行的  但是所有的4改为3就不可以用了。求问这是个什么问题？