void EXTI_ClearITPendingBit(uint32_t EXTI_Line)void EXTI_ClearFlag(uint32_t EXTI_Line)

这两个函数是用于清除外部中断标志位的函数。

`EXTI_ClearITPendingBit`函数用于清除指定的外部中断线的中断挂起位，参数`EXTI_Line`表示需要清除的外部中断线。该函数将会清除指定外部中断线上的中断挂起位，以便下一次触发中断时能够正确地检测到中断事件。

`EXTI_ClearFlag`函数用于清除指定的外部中断线的中断标志位，参数`EXTI_Line`表示需要清除的外部中断线。该函数将会清除指定外部中断线上的中断标志位，以便下一次触发中断时能够正确地检测到中断事件。

这两个函数通常在外部中断的中断处理函数中使用，用于在处理完中断后清除相应的标志位，以确保下一次触发中断时能够正常工作。

相关问题

声音识别代码stm32

以下是一个基于STM32的语音识别代码示例：

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

#define SAMPLE_RATE 16000
#define BUFFER_SIZE 1600
#define THRESHOLD 500

uint16_t buffer[BUFFER_SIZE];
volatile uint16_t buffer_index = 0;

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

    EXTI_InitTypeDef EXTI_InitStructure;
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

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

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

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

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

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET) {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        buffer[buffer_index++] = ADC_GetConversionValue(ADC1);
        if (buffer_index >= BUFFER_SIZE) {
            TIM_Cmd(TIM2, DISABLE);
        }
    }
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line0) == SET) {
        EXTI_ClearITPendingBit(EXTI_Line0);
        if (TIM_GetCounter(TIM2) < THRESHOLD) {
            buffer_index = 0;
            TIM_Cmd(TIM2, ENABLE);
        }
    }
}

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_1Cycles5);

    ADC_Cmd(ADC1, ENABLE);

    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1));

    ADC_StartCalibration(ADC1);
    while (ADC_GetCalibrationStatus(ADC1));
}

void RCC_Configuration(void)
{
    RCC_ADCCLKConfig(RCC_PCLK2_Div6);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}

int main(void)
{
    RCC_Configuration();
    GPIO_Configuration();
    ADC_Configuration();
    NVIC_Configuration();
    TIM_Configuration();

    while (1) {
        // do something
    }
}

这个代码通过ADC采样声音数据，然后将数据存储到数组中。当声音达到一定阈值时，会触发外部中断，开始采样声音数据。可以根据需要修改阈值和采样率等参数。

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。