stm32按键中断控制led灯代码

下面是一个简单的示例代码，用于在STM32上使用按键中断控制LED灯：

#include "stm32f10x.h"

void Delay(__IO uint32_t nCount);

int main(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  uint32_t ButtonPressed = 0x00;

  /* Enable the GPIO_LED Clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

  /* Configure the GPIO_LED pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* Enable the GPIO_BUTTON Clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  /* Configure the GPIO_BUTTON pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Enable AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  /* Connect EXTI Line0 to PA0 pin */
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

  /* Configure EXTI Line0 */
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  /* Enable and set EXTI Line0 Interrupt to the lowest priority */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  while (1)
  {
    if (ButtonPressed == 0x01)
    {
      /* Turn on LED */
      GPIO_SetBits(GPIOC, GPIO_Pin_13);

      /* Delay */
      Delay(0xFFFFF);

      /* Turn off LED */
      GPIO_ResetBits(GPIOC, GPIO_Pin_13);

      /* Reset ButtonPressed flag */
      ButtonPressed = 0x00;
    }
  }
}

void EXTI0_IRQHandler(void)
{
  /* Make sure that interrupt flag is set for EXTI Line0 */
  if (EXTI_GetITStatus(EXTI_Line0) != RESET)
  {
    /* Set ButtonPressed flag */
    ButtonPressed = 0x01;

    /* Clear interrupt flag */
    EXTI_ClearITPendingBit(EXTI_Line0);
  }
}

void Delay(__IO uint32_t nCount)
{
  for (; nCount != 0; nCount--);
}

在此示例中，我们使用PA0上的按键来控制PC13上的LED灯。当按下按钮时，会触发EXTI0_IRQHandler中断处理程序，在其中设置ButtonPressed标志，表示需要切换LED灯的状态。在主循环中，我们检查ButtonPressed标志，并相应地切换LED灯的状态。