DMA 获取 ADC数据异常

乡下老农提问时间：2015-3-4 22:42 /

本帖最后由乡下老农于 2015-3-4 23:51 编辑

我现在使用stm32f4上一个dma ,同时获取 adc1 上12个通道的数据,adc2 上一个通道的数据和 adc3 上8个通道的数据，但是现在获取的数据都是0xFF,代码如下
首先配置ADC 1，2，3

void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig_ADC1;
  __ADC1_CLK_ENABLE();

  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV8;
  hadc1.Init.Resolution = ADC_RESOLUTION8b;
  hadc1.Init.ScanConvMode = ENABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion = 0;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 12;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.EOCSelection = DISABLE;
  HAL_ADC_Init(&hadc1);

  sConfig_ADC1.Channel = ADC_CHANNEL_0;
  sConfig_ADC1.Rank = 1;
  sConfig_ADC1.SamplingTime = ADC_SAMPLETIME_480CYCLES;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_1;
  sConfig_ADC1.Rank = 2;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_2;
  sConfig_ADC1.Rank = 3;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_3;
  sConfig_ADC1.Rank = 4;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_4;
  sConfig_ADC1.Rank = 5;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_5;
  sConfig_ADC1.Rank = 6;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_6;
  sConfig_ADC1.Rank = 7;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_7;
  sConfig_ADC1.Rank = 8;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_8;
  sConfig_ADC1.Rank = 9;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_9;
  sConfig_ADC1.Rank = 10;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_10;
  sConfig_ADC1.Rank = 11;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);

  sConfig_ADC1.Channel = ADC_CHANNEL_11;
  sConfig_ADC1.Rank = 12;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig_ADC1);
}

void MX_ADC2_Init(void)
{
  ADC_ChannelConfTypeDef sConfig_ADC2;
  __ADC2_CLK_ENABLE();

  hadc2.Instance = ADC2;
  hadc2.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV8;
  hadc2.Init.Resolution = ADC_RESOLUTION8b;
  hadc2.Init.ScanConvMode = ENABLE;
  hadc2.Init.ContinuousConvMode = ENABLE;
  hadc2.Init.DiscontinuousConvMode = DISABLE;
  hadc2.Init.NbrOfDiscConversion = 0;
  hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc2.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
  hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc2.Init.NbrOfConversion = 1;
  hadc2.Init.DMAContinuousRequests = ENABLE;
  hadc2.Init.EOCSelection = EOC_SEQ_CONV;
  HAL_ADC_Init(&hadc2);

  sConfig_ADC2.Channel = ADC_CHANNEL_12;
  sConfig_ADC2.Rank = 1;
  HAL_ADC_ConfigChannel(&hadc2, &sConfig_ADC2);
}

/* ADC init function */
void MX_ADC3_Init(void)
{

  ADC_ChannelConfTypeDef sConfig_ADC3;
  __ADC3_CLK_ENABLE();

  hadc3.Instance = ADC3;
  hadc3.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV8;
  hadc3.Init.Resolution = ADC_RESOLUTION8b;
  hadc3.Init.ScanConvMode = ENABLE;
  hadc3.Init.ContinuousConvMode = ENABLE;
  hadc3.Init.DiscontinuousConvMode = DISABLE;
  hadc3.Init.NbrOfDiscConversion = 0;
  hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc3.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
  hadc3.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc3.Init.NbrOfConversion = 8;
  hadc3.Init.DMAContinuousRequests = ENABLE;
  hadc3.Init.EOCSelection = DISABLE;
  HAL_ADC_Init(&hadc3);

  sConfig_ADC3.Channel = ADC_CHANNEL_0;
  sConfig_ADC3.Rank = 1;
  sConfig_ADC3.SamplingTime = ADC_SAMPLETIME_480CYCLES;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_1;
  sConfig_ADC3.Rank = 2;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_2;
  sConfig_ADC3.Rank = 3;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_3;
  sConfig_ADC3.Rank = 4;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_4;
  sConfig_ADC3.Rank = 5;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_5;
  sConfig_ADC3.Rank = 6;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_6;
  sConfig_ADC3.Rank = 7;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

  sConfig_ADC3.Channel = ADC_CHANNEL_7;
  sConfig_ADC3.Rank = 8;
  HAL_ADC_ConfigChannel(&hadc3, &sConfig_ADC3);

}

再处理gpio
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{

  GPIO_InitTypeDef GPIO_InitStruct;
  if (hadc == &hadc3)
  {
// PF6 ------>ADC3_IN4 IR1
// PF7 ------>ADC3_IN5    IR2
// PF8 ------>ADC3_IN6 IR3
// PF9 ------>ADC3_IN7 IR4
// PF10------>ADC3_IN8 IR5
// PF3 ------>ADC3_IN9 IR6
// PF4 ------>ADC3_IN14 IR7
// PF5 ------>ADC3_IN15 IR8
GPIO_InitStruct.Pin = IR_DAT_PIN0|IR_DAT_PIN1|IR_DAT_PIN2|IR_DAT_PIN3
                        |IR_DAT_PIN4|IR_DAT_PIN5|IR_DAT_PIN6|IR_DAT_PIN7;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(IR_DAT_PORT, &GPIO_InitStruct);

  }

  if (hadc == &hadc2)
  {
GPIO_InitStruct.Pin = GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  }
  if (hadc == &hadc1)
  {
/**ADC1 GPIO Configuration
PA0-WKUP    ------> ADC1_IN0
PA1    ------> ADC1_IN1
PA2    ------> ADC1_IN2
PA3    ------> ADC1_IN3
PA4    ------> ADC1_IN4
PA5    ------> ADC1_IN5
PA6    ------> ADC1_IN6
PA7    ------> ADC1_IN7
PB0    ------> ADC1_IN8
PB1    ------> ADC1_IN9
PC0    ------> ADC1_IN10
PC1    ------> ADC1_IN11
*/
GPIO_InitStruct.Pin = M_DAT_PIN0|M_DAT_PIN1|M_DAT_PIN2|M_DAT_PIN3|M_DAT_PIN4|
M_DAT_PIN5|M_DAT_PIN6|M_DAT_PIN7;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = M_DAT_PIN8|M_DAT_PIN9;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_InitStruct.Pin = M_DAT_PIN10|M_DAT_PIN11;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

//ADC1 IO CONFIG FINISH

GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
__DMA2_CLK_ENABLE();
hdma_adc1.Instance = DMA2_Stream0;
hdma_adc1.Init.Channel = DMA_CHANNEL_0;
hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc1.Init.PeriphDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc1.Init.Mode = DMA_CIRCULAR;
hdma_adc1.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
hdma_adc1.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL;
hdma_adc1.Init.MemBurst = DMA_MBURST_SINGLE;
hdma_adc1.Init.PeriphBurst = DMA_PBURST_SINGLE;
HAL_DMA_Init(&hdma_adc1);
__HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);
  }

}

然后启动

if(HAL_ADC_Start(&hadc1) != HAL_OK)
  {

Error_Handler();
  }
   if(HAL_ADC_Start(&hadc2) != HAL_OK)
  {
/* Start Error */ Error_Handler();
  }

if(HAL_ADC_Start(&hadc3) != HAL_OK)
  {

Error_Handler();
  }

  ADC_MultiModeTypeDef mode;
  mode.Mode = ADC_TRIPLEMODE_INTERL;
  mode.DMAAccessMode = ADC_DMAACCESSMODE_1;
  mode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_20CYCLES;

  if(HAL_ADCEx_MultiModeConfigChannel(&hadc1, &mode) != HAL_OK)
  {
/* Channel Configuration Error */
Error_Handler();
  }

if(HAL_ADCEx_MultiModeStart_DMA(&hadc1, (uint32_t*)&uhADCxConvertedValue, 40) != HAL_OK)
  {
/* Start Error */
Error_Handler();
  }

最终在这里获取上数据
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* AdcHandle)
{
这里直接断点看结果

00000000 00000000 00000000 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff 00000000 00000000 00000000
}

为啥会这样？？？
我的ref脚 3.3v已经ok ,其他脚上的电压应该是七零八落不会全是ff这么整齐呀
而且运行过程中修改adc的时钟，得到的值会不同，而且adc1,adc2长期溢出