Posted on July 21, 2015 at 14:44Hello all,
I am writing an application on a STM32F4 which reads from two sensors. I do it with two ADC3 channels with DMA. I use HAL_DRIVERS
I write on a buffer several readings from three sensors by calling:
HAL_ADC_Start(&hadc3);
HAL_ADC_Start_DMA(&hadc3, (uint32_t*)ADC1ConvertedValues, 18);
In ''void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)''
I call: HAL_ADC_Stop_DMA(&hadc3);
and then HAL_ADC_Start_DMA(&hadc3, (uint32_t*)ADC1ConvertedValues, 18);
when I need another sensor reading.
The problem is that ADC1ConvertedValues[] has always the same information (only the first readings are ok). The others make no effect in ADC1ConvertedValues[].
Any idea why?
Many thanks in advance.
Some code of important functions:
void MX_ADC3_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc3.Instance = ADC3;
hadc3.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
hadc3.Init.Resolution = ADC_RESOLUTION12b;
hadc3.Init.ScanConvMode = ENABLE;
hadc3.Init.ContinuousConvMode = ENABLE;
hadc3.Init.DiscontinuousConvMode = DISABLE;
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc3.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc3.Init.NbrOfConversion = 3;
hadc3.Init.DMAContinuousRequests = DISABLE;
hadc3.Init.EOCSelection = EOC_SINGLE_CONV;
HAL_ADC_Init(&hadc3);
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_9;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
HAL_ADC_ConfigChannel(&hadc3, &sConfig);
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_14;
sConfig.Rank = 2;
HAL_ADC_ConfigChannel(&hadc3, &sConfig);
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_15;
sConfig.Rank = 3;
HAL_ADC_ConfigChannel(&hadc3, &sConfig);
}
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(hadc->Instance==ADC3)
{
/* USER CODE BEGIN ADC3_MspInit 0 */
/* USER CODE END ADC3_MspInit 0 */
/* Peripheral clock enable */
__ADC3_CLK_ENABLE();
/**ADC3 GPIO Configuration
PF3 ------> ADC3_IN9
PF4 ------> ADC3_IN14
PF5 ------> ADC3_IN15
*/
GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
/* Peripheral DMA init*/
hdma_adc3.Instance = DMA2_Stream0;
hdma_adc3.Init.Channel = DMA_CHANNEL_2;
hdma_adc3.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc3.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc3.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_adc3.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc3.Init.Mode = DMA_CIRCULAR;
hdma_adc3.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_adc3.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_adc3);
__HAL_LINKDMA(hadc,DMA_Handle,hdma_adc3);
/* USER CODE BEGIN ADC3_MspInit 1 */
/* USER CODE END ADC3_MspInit 1 */
}
}
#stm32f4 #adc #dma
