stm32 ADC2中断采样

以下是基于STM32F4系列的ADC2中断采样的示例代码：

#include "stm32f4xx.h"

#define ADC2_DR_ADDRESS     ((uint32_t)0x4001214C)

__IO uint16_t ADC2ConvertedValue = 0;

void ADC2_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  ADC_InitTypeDef ADC_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable ADC2 and GPIOC clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

  /* Configure ADC2 Channel 11 pin as analog input */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* ADC2 Configuration */
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADC2, &ADC_InitStructure);

  /* ADC2 Regular Channel 11 Configuration */
  ADC_RegularChannelConfig(ADC2, ADC_Channel_11, 1, ADC_SampleTime_15Cycles);

  /* Enable ADC2 DMA request */
  ADC_DMARequestAfterLastTransferCmd(ADC2, ENABLE);

  /* Enable ADC2 interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable ADC2 */
  ADC_Cmd(ADC2, ENABLE);
}

void ADC_IRQHandler(void)
{
  if(ADC_GetITStatus(ADC2, ADC_IT_EOC) != RESET)
  {
    ADC_ClearITPendingBit(ADC2, ADC_IT_EOC);
    /* Get ADC2 converted value */
    ADC2ConvertedValue = ADC_GetConversionValue(ADC2);
  }
}

int main(void)
{
  ADC2_Init();

  while (1)
  {
    /* Start ADC2 conversion */
    ADC_SoftwareStartConv(ADC2);

    /* Wait until ADC2 conversion is complete */
    while(ADC_GetFlagStatus(ADC2, ADC_FLAG_EOC) == RESET);

    /* Do something with ADC2 converted value */
    // ...
  }
}

在该代码中，通过调用`ADC2_Init()`函数初始化ADC2。其中，ADC2的输入通道被配置为PC1，采样时间为15个时钟周期。ADC2采用中断模式，当转换完成时会触发中断。在中断处理程序中，通过调用`ADC_GetConversionValue()`函数获取ADC2转换后的值，并存储到全局变量`ADC2ConvertedValue`中。在主函数中，通过调用`ADC_SoftwareStartConv()`函数启动ADC2转换，并在转换完成后通过`ADC_GetFlagStatus()`函数等待转换完成。转换完成后，可以在主函数中对转换后的值进行处理。