NUCLEO上手之——EXTI：M3和M0的EXTI配置差别

woshilee 提问时间：2014-12-10 11:30 /

#include "stm32f0xx.h"
unsigned char flag=0;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Delay
  * @param  None
  * @retval None
  */
void Delay(unsigned int ncount)
{
  while(ncount--);
}
/**
  * @brief  GPIO Initial
  * @param  None
  * @retval None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef       GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/**
  * @brief  EXTI Initial
  * @param  None
  * @retval None
  */
void EXTI_Configuration(void)
{
EXTI_InitTypeDef       EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line=EXTI_Line13;
EXTI_InitStructure.EXTI_LineCmd=ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
      EXTI_Init(&EXTI_InitStructure);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource13);
}

/**
  * @brief  GPIO Initial
  * @param  None
  * @retval None
  */
void RCC_Configuration(void)
{
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
}
/**
  * @brief  NVIC Initial
  * @param  None
  * @retval None
  */
void NVIC_Configuration(void)
{
NVIC_InitTypeDef       NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel=EXTI4_15_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPriority=1;
NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
EXTI_Configuration();
            while (1);
}
/**
  * @brief  IRQ
  * @param  None
  * @retval None
  */
void EXTI4_15_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line13)==1)
{
Delay(0xff);
if(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_13)==0)
while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_13)==0);
GPIOA->ODR ^= GPIO_Pin_5;
  EXTI_ClearFlag(EXTI_Line13);
}
}
红色部分是M0和M3不同的部分：
M3中这样配置：GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0|GPIO_PinSource1);
M0用到l了SYSCFG，就要开启它的时钟