请教：AD采集的点个数不对

不吃鱼的猫大人 · 发表于 2024-8-6 19:50:38

请教大家一个问题：就是我程序设定外部触发中断，然后进行AD采集，一次只采集1024个点，ADC的时钟我设置的最大是50MHZ，但是实际采集出来一组的点远远超过1024是为什么呢？

下面是我关于ADC的一些配置：

#define ADC_DATA_LENGTH 1024 //定义采集数据长度为1024
uint8_t g_adc3_dma_data1[ADC_DATA_LENGTH];//定义adc3采集数据存放数组
uint8_t g_adc3_dma_complete_flag = 0; //adc3数据dma采集完成标志，在dma采集完成回调函数设置

ADC_HandleTypeDef hadc3;
DMA_HandleTypeDef hdma_adc3;

void MX_ADC3_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};
  hadc3.Instance = ADC3;
  hadc3.Init.Resolution = ADC_RESOLUTION_8B;
  hadc3.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc3.Init.EOCSelection = ADC_EOC_SEQ_CONV;//一组结束后给标志
  hadc3.Init.LowPowerAutoWait = DISABLE;
  hadc3.Init.ContinuousConvMode = ENABLE;//开启连续转换
  hadc3.Init.NbrOfConversion = 1;
  hadc3.Init.DiscontinuousConvMode = DISABLE;
  hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;//软件触发
  hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  //一旦 ADC 转换完成，通过 DMA 将数据传输到内存中
  hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;
//  最新采集的数据不会覆盖旧数据
  hadc3.Init.Overrun = OVR_DATA_PRESERVED;
  hadc3.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;
  hadc3.Init.OversamplingMode = DISABLE;
  if (HAL_ADC_Init(&hadc3) != HAL_OK)
  {
Error_Handler();
  }

  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  sConfig.OffsetSignedSaturation = DISABLE;
  if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
  {
Error_Handler();
  }
}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{

  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
  if(adcHandle->Instance==ADC3)
  {
GPIO_InitTypeDef GPIO_InitStruct = {0};
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
PeriphClkInitStruct.PLL3.PLL3M = 25;
PeriphClkInitStruct.PLL3.PLL3N = 200;
PeriphClkInitStruct.PLL3.PLL3P = 4;
PeriphClkInitStruct.PLL3.PLL3Q = 4;
PeriphClkInitStruct.PLL3.PLL3R = 2;
PeriphClkInitStruct.PLL3.PLL3RGE = RCC_PLL3VCIRANGE_0;
PeriphClkInitStruct.PLL3.PLL3VCOSEL = RCC_PLL3VCOWIDE;
PeriphClkInitStruct.PLL3.PLL3FRACN = 0;
PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL3;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
   Error_Handler();
}
/* ADC3 clock enable */
__HAL_RCC_ADC3_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
/**ADC3 GPIO Configuration
PC3_C    ------> ADC3_INP1
*/
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG ;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PC3, SYSCFG_SWITCH_PC3_OPEN);
/* ADC3 DMA Init */
/* ADC3 Init */
hdma_adc3.Instance = DMA1_Stream2;
hdma_adc3.Init.Request = DMA_REQUEST_ADC3;
hdma_adc3.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc3.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc3.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_adc3.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_adc3.Init.Mode = DMA_CIRCULAR;//DMA循环模式
hdma_adc3.Init.Priority = DMA_PRIORITY_HIGH;
hdma_adc3.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_adc3) != HAL_OK)
{
   Error_Handler();
}
__HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc3);
  }
}
void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)
{
  if(adcHandle->Instance==ADC3)
  {
__HAL_RCC_ADC3_CLK_DISABLE();
/* ADC3 DMA DeInit */
HAL_DMA_DeInit(adcHandle->DMA_Handle);
  }
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) // 处理GPIO_PIN_1的中断事件
{
if (GPIO_Pin == GPIO_PIN_1)
{
g_adc3_dma_complete_flag = 1;
}
}

//ADC回调函数，ADC采集完成后进入回调函数
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
if(hadc->Instance==ADC3)
{
g_adc3_dma_complete_flag = 2;//采集完成标志
HAL_ADC_Stop_DMA(&hadc3);
}
}
void ADC_Caiji(void)
{
if(g_adc3_dma_complete_flag == 1)//检测到上升沿开始启动ADC_DMA
{
// HAL_Delay(1);
HAL_ADC_Start_DMA(&hadc3,(uint32_t *)g_adc3_dma_data1,ADC_DATA_LENGTH);//ADC的dma开始采集
if(g_adc3_dma_complete_flag == 2)
{
for(int j=0;j<ADC_DATA_LENGTH;j++)
{
//采集到的值传到上位机串口，注意用仿真器的串口容易死机。
printf("%d\r\n",g_adc3_dma_data1[j]);
}
memset(g_adc3_dma_data1,0,ADC_DATA_LENGTH);//清除数据
g_adc3_dma_complete_flag = 0;
}
}
}

将近2000个点.png