基于stm32f103的SR505的示例代码

以下是基于STM32F103的SR505示例代码：

#include "stm32f10x.h"

#define SENSOR_PIN GPIO_Pin_0
#define SENSOR_PORT GPIOA
#define LED_PIN GPIO_Pin_1
#define LED_PORT GPIOA

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

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

  while (1) {
    // 等待中断触发
  }
}

void GPIO_Configuration(void) {
  GPIO_InitTypeDef GPIO_InitStructure;

  // 使能GPIOA时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  // 配置SENSOR_PIN为输入模式
  GPIO_InitStructure.GPIO_Pin = SENSOR_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(SENSOR_PORT, &GPIO_InitStructure);

  // 配置LED_PIN为输出模式
  GPIO_InitStructure.GPIO_Pin = LED_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void EXTI_Configuration(void) {
  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  // 使能AFIO时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  // 配置SENSOR_PIN为中断输入模式
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

  // 配置EXTI线路
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  // 配置中断优先级
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void EXTI0_IRQHandler(void) {
  if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
    // SR505检测到有人体靠近
    GPIO_WriteBit(LED_PORT, LED_PIN, Bit_SET);
    EXTI_ClearITPendingBit(EXTI_Line0);
  }
}

请注意，这只是一个基本的示例代码，您可以根据自己的需求进行修改和优化。另外，需要注意的是，SR505的输出信号需要通过外部中断来触发，所以需要配置相应的中断线路。