STM32F103C8T6单片机NEC红外信号解码程序

好的，这个问题我可以帮你回答。下面是一个简单的STM32F103C8T6单片机NEC红外信号解码程序的示例代码：

#include "stm32f10x.h"

#define IR_PORT GPIOA
#define IR_PIN GPIO_Pin_0

volatile uint16_t ir_code = 0;
volatile uint8_t ir_state = 0;

void EXTI0_IRQHandler(void) {
    if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
        EXTI_ClearITPendingBit(EXTI_Line0);
        if (ir_state == 0) {
            TIM2->CNT = 0;
            TIM_Cmd(TIM2, ENABLE);
            ir_state = 1;
        } else if (ir_state == 1) {
            ir_code = TIM2->CNT;
            TIM_Cmd(TIM2, DISABLE);
            ir_state = 2;
        }
    }
}

void TIM2_IRQHandler(void) {
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        ir_state = 0;
    }
}

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

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

    GPIO_InitStructure.GPIO_Pin = IR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(IR_PORT, &GPIO_InitStructure);

    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 = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ClearFlag(TIM2, TIM_FLAG_Update);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    while (1) {
        if (ir_code != 0) {
            // decode NEC infrared signal
            // ...
            ir_code = 0;
        }
    }
}

这个示例程序使用了外部中断和定时器来解码NEC红外信号。当红外接收器接收到一个NEC红外信号的起始脉冲时，会触发外部中断。在中断处理函数中，根据当前状态分别启动和停止定时器，以计算红外信号的脉宽。当定时器溢出时，会触发另一个中断处理函数，重置状态。在主循环中，如果检测到一个完整的红外信号，则进行解码处理。