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DMA with ADC trouble

Question asked by Raider E on Dec 21, 2016
Latest reply on Dec 21, 2016 by Oliver Beirne

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_IN0
PA1 ------> 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_IN0
PA1 ------> 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 */

}

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