关于STM32L052采样AD双通道切换问题

只看该作者 · 2016-1-26 16:36

用STM32L052采样AD，两个通道，双通道切换在AD中断中完成,要怎么设置，试了1天，都无法解决！！！

只看该作者 · 2016-1-26 20:29

是要同时用两个通道还是在中断中两个通道互相切换？

只看该作者 · 2016-1-27 08:22

ccw1986 发表于 2016-1-26 20:29
是要同时用两个通道还是在中断中两个通道互相切换？

中断中两个通道互相切换

我还怀疑是设置问题

HAL_ADC_Init(&hadc);
/**Configure for the selected ADC regular channel to be converted.
*/
  sConfig.Channel = ADC_CHANNEL_2;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);

只看该作者 · 2016-1-27 08:23

用到通道2 通道7
中断中两个通道互相切换

HAL_ADC_Init(&hadc);
/**Configure for the selected ADC regular channel to be converted.
*/
  sConfig.Channel = ADC_CHANNEL_7;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);

只看该作者 · 2016-1-27 11:19

现在是是什么问题，是就不能切换还是只切了一次

只看该作者 · 2016-1-27 14:39

全部使用DMA，转换完成自动存储到指定位置。

只看该作者 · 2016-1-27 14:53

豆腐块发表于 2016-1-27 11:19
现在是是什么问题，是就不能切换还是只切了一次

设置的时候必须关掉中断
设置完成才开启中断。
运行ad转换
现在是通道7，可以切到通道2
但通道2，切不到通道7

只看该作者 · 2016-1-27 17:10

这个切换需不需要时间延迟

只看该作者 · 2016-1-28 09:10

uint8_t  CH_dp=0;
/* ADC init function */
void MX_ADC_Init(void)
{
  ADC_ChannelConfTypeDef sConfig;

  hadc.Instance = ADC1;

  hadc.Init.OversamplingMode = ENABLE;
  hadc.Init.Oversample.Ratio = ADC_OVERSAMPLING_RATIO_128;
  hadc.Init.Oversample.RightBitShift = ADC_RIGHTBITSHIFT_3;
  hadc.Init.Oversample.TriggeredMode = ADC_TRIGGEREDMODE_SINGLE_TRIGGER;

  hadc.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION12b;
  hadc.Init.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ContinuousConvMode = ENABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.EOCSelection = EOC_SINGLE_CONV;
  hadc.Init.Overrun = OVR_DATA_PRESERVED;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerFrequencyMode = ENABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  HAL_ADC_Init(&hadc);

/* USER CODE BEGIN 7 */
  if (HAL_ADCEx_Calibration_Start(&hadc, ADC_SINGLE_ENDED) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE END 7 */
/**Configure for the selected ADC regular channel to be converted.
*/
  sConfig.Channel = ADC_CHANNEL_7;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);
}

/* ADC2 init function */
void MX_ADC2_Init(void)
{
  ADC_ChannelConfTypeDef sConfig;

  hadc.Instance = ADC1;

  hadc.Init.OversamplingMode = ENABLE;
  hadc.Init.Oversample.Ratio = ADC_OVERSAMPLING_RATIO_128;
  hadc.Init.Oversample.RightBitShift = ADC_RIGHTBITSHIFT_3;
  hadc.Init.Oversample.TriggeredMode = ADC_TRIGGEREDMODE_SINGLE_TRIGGER;

  hadc.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION12b;
  hadc.Init.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;//轮流对各个通道进行采集
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;//数据对齐方式
  hadc.Init.ContinuousConvMode = ENABLE;//连续转换模式
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;//控制触发模式
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.EOCSelection = EOC_SINGLE_CONV;
  hadc.Init.Overrun = OVR_DATA_PRESERVED;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerFrequencyMode = ENABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  HAL_ADC_Init(&hadc);

/**Configure for the selected ADC regular channel to be converted.
*/
  sConfig.Channel = ADC_CHANNEL_2;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);
}
/* ADC7 init function */
void MX_ADC7_Init(void)
{
  ADC_ChannelConfTypeDef sConfig;

  hadc.Instance = ADC1;

  hadc.Init.OversamplingMode = ENABLE;
  hadc.Init.Oversample.Ratio = ADC_OVERSAMPLING_RATIO_128;
  hadc.Init.Oversample.RightBitShift = ADC_RIGHTBITSHIFT_3;
  hadc.Init.Oversample.TriggeredMode = ADC_TRIGGEREDMODE_SINGLE_TRIGGER;

  hadc.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION12b;
  hadc.Init.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ContinuousConvMode = ENABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.EOCSelection = EOC_SINGLE_CONV;
  hadc.Init.Overrun = OVR_DATA_PRESERVED;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerFrequencyMode = ENABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  HAL_ADC_Init(&hadc);

/**Configure for the selected ADC regular channel to be converted.
*/
  sConfig.Channel = ADC_CHANNEL_7;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* AdcHandle)
{
  /* Get the converted value of regular channel */

  uwADCxConvertedValue = HAL_ADC_GetValue(AdcHandle);

  HAL_ADC_Stop_IT(&hadc);
if(CH_dp==0)
{
CH_dp=1;
MX_ADC2_Init();
}
else
{
CH_dp=0;
MX_ADC7_Init();
}

HAL_ADC_Start_IT(&hadc);

  HAL_UART_Transmit_IT(&huart1, (uint8_t*)uwADCxConvertedValue, 4);
}
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *UartHandle)
{
}

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ADC_Init();
  MX_COMP1_Init();
  MX_TIM21_Init();
  MX_USART1_UART_Init();

  /* USER CODE BEGIN 2 */
  HAL_COMP_Start(&hcomp1);
  HAL_ADC_Start_IT(&hadc);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
  }

  /* USER CODE END 3 */
}

只看该作者 · 2016-1-28 12:35

感谢，安大师的例程。。
可以了
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* AdcHandle)
{
  /* Get the converted value of regular channel */

  uwADCxConvertedValue = HAL_ADC_GetValue(AdcHandle);

  HAL_ADC_Stop_IT(&hadc);
      if(CH_dp==0)
      {
            CH_dp=1;
            ADC1->CHSELR = ADC_CHANNEL_2;
      }
      else
      {
            CH_dp=0;
            ADC1->CHSELR = ADC_CHANNEL_7;
      }

      HAL_ADC_Start_IT(&hadc);

  HAL_UART_Transmit_IT(&huart1, (uint8_t*)uwADCxConvertedValue, 4);
}

只看该作者 · 2016-1-29 10:26

在中断中先把数据读出来，再重新初始化adc

只看该作者 · 2016-1-31 11:27

楼主你最好先把你的程序贴出来看看
应该是在中断中再初始化一下

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