DMA with ADC trouble

[Raider E]

Posted on December 21, 2016 at 02:12

Hi again,

I am trying to use DMA now as its more straightforward but still not working for me. Ain[0] below is only reading some weird voltage 0-0.17V instead of 1.3V and Ain[1] reads nothing stays 0.  can you please have a look and let me know what might have gone wrong:

#include 'stm32f7xx_hal.h'#include 'global.h'#define NO_OF_CHANNELS 2#define NO_OF_ADCs 1

//Note that Interrupts for all peripherals are located in the xxx_msp file and xxx_it

void MX_ADC1_Init(void);void MX_DMA_Init(void);void readAins(void);

void MX_DMA_Init(void)

{/* DMA controller clock enable */__HAL_RCC_DMA2_CLK_ENABLE();

/* DMA interrupt init */

/* DMA2_Stream0_IRQn interrupt configuration */HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);

}

void MX_ADC1_Init(void)

{

ADC_ChannelConfTypeDef sConfig;

/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)

*/hadc1.Instance = ADC1;hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;hadc1.Init.Resolution = ADC_RESOLUTION_12B;hadc1.Init.ScanConvMode = ENABLE;hadc1.Init.ContinuousConvMode = DISABLE;hadc1.Init.DiscontinuousConvMode = DISABLE;hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;hadc1.Init.NbrOfConversion = 2;hadc1.Init.DMAContinuousRequests = ENABLE;hadc1.Init.EOCSelection = DISABLE;HAL_ADC_Init(&hadc1);// if (HAL_ADC_Init(&hadc1) != HAL_OK)// {// Error_Handler();// }

/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.

*/sConfig.Channel = ADC_CHANNEL_2;sConfig.Rank = 2;sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;HAL_ADC_ConfigChannel(&hadc1, &sConfig);

if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)

{Error_Handler();}

sConfig.Channel = ADC_CHANNEL_0;

sConfig.Rank = 1;HAL_ADC_ConfigChannel(&hadc1, &sConfig);if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK){Error_Handler();}// All Channels has to be preconfgured here as above}

void readAins(void){

HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&value2, 2);Ain[0]=value2[0];Ain[1]=value2[1];}

msp file:

void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)

{

GPIO_InitTypeDef GPIO_InitStruct;

if(hadc->Instance==ADC1){/* USER CODE BEGIN ADC1_MspInit 0 */

/* USER CODE END ADC1_MspInit 0 */

/* Peripheral clock enable */__HAL_RCC_ADC1_CLK_ENABLE();

/**ADC1 GPIO Configuration

PA0/WKUP ------> ADC1_IN0PA1 ------> ADC1_IN1 */GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2;GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = GPIO_NOPULL;HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USER CODE BEGIN ADC1_MspInit 1 */

/* USER CODE END ADC1_MspInit 1 */

/* Peripheral DMA init*/

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_PDATAALIGN_WORD;hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;hdma_adc1.Init.Mode = DMA_CIRCULAR;hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;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);// if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)// {// Error_Handler();// }__HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);

}

}

void HAL_ADC_MspDeInit(ADC_HandleTypeDef* hadc)

{

if(hadc->Instance==ADC1)

{/* USER CODE BEGIN ADC1_MspDeInit 0 */

/* USER CODE END ADC1_MspDeInit 0 */

/* Peripheral clock disable */__HAL_RCC_ADC1_CLK_DISABLE();

/**ADC1 GPIO Configuration

PA0/WKUP ------> ADC1_IN0PA1 ------> ADC1_IN1 */HAL_GPIO_DeInit(GPIOA, GPIO_PIN_0|GPIO_PIN_1);

/* Peripheral DMA DeInit*/

HAL_DMA_DeInit(hadc->DMA_Handle);// __HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);}/* USER CODE BEGIN ADC1_MspDeInit 1 */

/* USER CODE END ADC1_MspDeInit 1 */

}

[Oliver Beirne]

Posted on December 21, 2016 at 20:02

Hi

Alzqhoul.Esam

I have moved your post to

https://community.st.com/community/stm32-community/stm32-forum/activity

where product-related questions are asked. If you have any further questions post them here.

Thanks

Oli