F407 芯片 DMA 获取 ADC数据异常

friendzj

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)

  {

//    F6 ------>ADC3_IN4   IR1

//    F7 ------>ADC3_IN5      IR2

//    F8 ------>ADC3_IN6   IR3

//    F9 ------>ADC3_IN7   IR4

//    F10------>ADC3_IN8   IR5

//    F3 ------>ADC3_IN9   IR6

//    F4 ------>ADC3_IN14   IR7

//    F5 ------>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);

    

    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

正点原子

帮顶....

xuande

1、质疑这么做的意义。
DMA的优势，是速度快，软件需求量少。
但LZ这需求，必须频繁更换ADC的输入切换开关，这必须用软件实现。这样，DMA的意义就打了折扣。
与其DMA，不如软件直接实现。

2、如果一定要这么做，给些建议:

这种把几个动作连贯起来的事，还是有点难度的。
一定要明确物理过程：希望实现什么过程？要分解成几个动作？每个动作如何实现？

friendzj

回复【3楼】xuande:
---------------------------------
1、原因，主要是为了保证逻辑处理的连贯性，因为我要测试的对象逻辑都一样，全部用dma处理以后，可以保证逻辑的单一性，当然么，复杂性转移到驱动层了。

2、我希望的目标不停的、或者说尽量快的同时测量21个对象，输出到一个内存块中。后续有算法单独处理这些数据。