用stm32写一段检测正弦波频率的代码

好的，以下是一段使用STM32检测正弦波频率的代码，供参考：

#include "stm32f10x.h"

#define SAMPLE_SIZE 512 // 采样点数
#define SAMPLE_FREQ 10000 // 采样频率

uint16_t ADC_ConvertedValue[SAMPLE_SIZE]; // ADC采样结果

float max_value = 0; // 最大值
float min_value = 4096; // 最小值
int max_index = 0; // 最大值索引
int min_index = 0; // 最小值索引
float freq = 0; // 正弦波频率

void Delay(__IO uint32_t nCount) {
  while(nCount--) {
  }
}

void ADC1_Configuration(void) {
  GPIO_InitTypeDef GPIO_InitStructure;
  ADC_InitTypeDef ADC_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

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

  ADC_DeInit(ADC1);
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  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_Cmd(ADC1, ENABLE);
  ADC_ResetCalibration(ADC1);
  while(ADC_GetResetCalibrationStatus(ADC1));

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

void TIM2_Configuration(void) {
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  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);

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

  TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

  TIM_Cmd(TIM2, ENABLE);
}

void TIM2_IRQHandler(void) {
  static int i = 0;
  static float sum = 0;

  TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

  if (i == SAMPLE_SIZE) {
    freq = (float)SAMPLE_FREQ / (max_index - min_index);
    i = 0;
    sum = 0;
    max_value = 0;
    min_value = 4096;
  }

  sum += ADC_ConvertedValue[i];
  if (ADC_ConvertedValue[i] > max_value) {
    max_value = ADC_ConvertedValue[i];
    max_index = i;
  }
  if (ADC_ConvertedValue[i] < min_value) {
    min_value = ADC_ConvertedValue[i];
    min_index = i;
  }

  i++;
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

int main(void) {
  ADC1_Configuration();
  TIM2_Configuration();

  while(1) {
    Delay(1000);
  }
}

这段代码使用了单片机的ADC模块来采样正弦波信号，并通过定时器中断来处理采样的数据。具体流程如下：

1. 定义采样点数和采样频率；
2. 定义ADC采样结果数组和相关变量；
3. 配置ADC模块，并启动ADC转换；
4. 配置定时器TIM2，开启定时器中断；
5. 在中断服务函数中，处理ADC采样结果，并计算正弦波频率。

需要注意的是，此代码仅供参考，具体实现方式可能需要根据实际情况进行调整。