STM32F103C8T6按键控制LED灯代码

以下是一个简单的按键控制LED灯的示例代码，使用STM32F103C8T6的GPIO和中断功能：

#include "stm32f10x.h"

#define LED_PIN GPIO_Pin_13
#define LED_GPIO_PORT GPIOC

#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_GPIO_PORT GPIOA

void GPIO_Configuration(void);
void NVIC_Configuration(void);
void EXTI_Configuration(void);

int main(void) {
  GPIO_Configuration();
  NVIC_Configuration();
  EXTI_Configuration();

  while (1) {
    // 循环等待中断事件
  }
}

void GPIO_Configuration(void) {
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin = LED_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(LED_GPIO_PORT, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(BUTTON_GPIO_PORT, &GPIO_InitStructure);
}

void NVIC_Configuration(void) {
  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void EXTI_Configuration(void) {
  EXTI_InitTypeDef EXTI_InitStructure;

  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

  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);
}

void EXTI0_IRQHandler(void) {
  if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
    // 检测到按键事件
    if (GPIO_ReadInputDataBit(BUTTON_GPIO_PORT, BUTTON_PIN) == RESET) {
      // 按键被按下
      GPIO_WriteBit(LED_GPIO_PORT, LED_PIN, Bit_SET);
    } else {
      // 按键被释放
      GPIO_WriteBit(LED_GPIO_PORT, LED_PIN, Bit_RESET);
    }

    EXTI_ClearITPendingBit(EXTI_Line0);
  }
}

该代码将PA0引脚配置为输入模式，使用内部上拉电阻，控制一个外部按键。同时，PC13引脚被配置为输出模式，控制一个LED灯。当按键被按下时，LED灯会亮起；当按键被释放时，LED灯会熄灭。中断功能允许程序在按键事件发生时立即响应，而不需要不断地轮询输入引脚状态。