stm32f4的红外遥控hx1838程序

以下是基于STM32F4的HX1838红外遥控程序示例：

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "misc.h"

#define IR_PIN GPIO_Pin_0
#define IR_GPIO GPIOA
#define IR_RCC RCC_AHB1Periph_GPIOA

volatile uint32_t tick_count = 0;
volatile uint32_t last_edge_time = 0;
volatile uint32_t ir_code = 0;

void SysTick_Handler(void)
{
  tick_count++;
}

void EXTI0_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line0) != RESET)
  {
    uint32_t current = tick_count;
    uint32_t elapsed = current - last_edge_time;
    last_edge_time = current;
    if(elapsed > 7000) // Start bit
    {
      ir_code = 0;
    }
    else if(elapsed > 3500) // End bit
    {
      // Process received IR code here
    }
    else // Data bit
    {
      ir_code <<= 1;
      if(elapsed > 1000) // Logic 1
      {
        ir_code |= 1;
      }
    }
    EXTI_ClearITPendingBit(EXTI_Line0);
  }
}

void init_systick(void)
{
  SysTick_Config(SystemCoreClock / 1000);
}

void init_ir_receiver(void)
{
  GPIO_InitTypeDef gpio_init;
  EXTI_InitTypeDef exti_init;
  NVIC_InitTypeDef nvic_init;

  RCC_AHB1PeriphClockCmd(IR_RCC, ENABLE);

  gpio_init.GPIO_Pin = IR_PIN;
  gpio_init.GPIO_Mode = GPIO_Mode_IN;
  gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
  gpio_init.GPIO_OType = GPIO_OType_PP;
  gpio_init.GPIO_PuPd = GPIO_PuPd_UP;

  GPIO_Init(IR_GPIO, &gpio_init);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

  exti_init.EXTI_Line = EXTI_Line0;
  exti_init.EXTI_Mode = EXTI_Mode_Interrupt;
  exti_init.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
  exti_init.EXTI_LineCmd = ENABLE;

  EXTI_Init(&exti_init);

  nvic_init.NVIC_IRQChannel = EXTI0_IRQn;
  nvic_init.NVIC_IRQChannelPreemptionPriority = 0x00;
  nvic_init.NVIC_IRQChannelSubPriority = 0x00;
  nvic_init.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&nvic_init);
}

int main(void)
{
  init_systick();
  init_ir_receiver();

  while(1)
  {
    // Your code here
  }
}

这个程序使用了STM32F4的SysTick定时器来计算时间，并使用了外部中断EXTI0来接收HX1838红外解码器的信号。当接收到红外信号时，程序将计算时间间隔并解码数据。你可以在"Process received IR code here"注释下面的代码中添加你自己的逻辑来处理解码后的数据。