STM32F103C8T6单片机红外信号解码程序

好的，以下是一个基于STM32F103C8T6单片机的红外信号解码程序的代码：

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_tim.h"

#define IR_PIN GPIO_Pin_0
#define IR_GPIO GPIOA

__IO uint16_t Time_1us = 0;
__IO uint8_t Bit_Count = 0;
__IO uint32_t Data = 0;
__IO uint8_t IR_Received = 0;

void Delay_us(__IO uint16_t us)
{
    Time_1us = us;
    while(Time_1us);
}

void TIM2_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        Time_1us--;
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    }
}

void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        if(Bit_Count == 0)
        {
            TIM_Cmd(TIM2, ENABLE);
        }
        else
        {
            Data <<= 1;
            if(Time_1us < 40)
            {
                Data |= 0;
            }
            else
            {
                Data |= 1;
            }
        }
        Bit_Count++;
        if(Bit_Count == 32)
        {
            IR_Received = 1;
        }
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = IR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(IR_GPIO, &GPIO_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);

    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);

    TIM_TimeBaseStructure.TIM_Period = 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    while(1)
    {
        if(IR_Received)
        {
            IR_Received = 0;
            if(Data == 0x00FF30CF)
            {
                //TODO: 对于接收到的指定红外信号进行相应操作
            }
            Bit_Count = 0;
            Data = 0;
            TIM_Cmd(TIM2, DISABLE);
        }
    }
}

这段代码使用了STM32的定时器和外部中断功能来实现红外信号解码，具体流程如下：

1. 配置红外接收器的GPIO为输入上拉模式。
2. 通过外部中断来捕获红外信号的下降沿，启动定时器开始计时。
3. 在定时器中断中，每隔1us减少计时器的值，当计时器值为0时，定时器停止计时。
4. 根据定时器停止计时的时间来判断接收到的是0还是1，将接收到的数据存储到Data变量中。
5. 当接收到的数据达到32位时，IR_Received变量置为1。
6. 在主函数中，不断检查IR_Received变量是否为1，如果为1，则说明接收到了红外信号，根据接收到的数据进行相应的操作。

需要注意的是，这段代码中只针对接收到某个特定的红外信号进行了处理，如果需要接收其他红外信号，需要根据具体情况修改代码。