Posted on April 27, 2015 at 18:57Hello,
I'm working on multi channel ADC reading with DMA. But I'm not clear how coverted ADC data of each channel transfer to the assigned memory location.
I used STcubeMX to set two input channels of ADC1 with DMA request.
However, my setting read only one channel.
I attaced my code below. Please take a look and help me if anyone knows what is the problem.
Thank you in advance.
/* I used these three HAL_API func. in main func. to initialize and start adc with DMA */
HAL_ADC_MspInit(&hadc1);
HAL_ADC_Init(&hadc1);
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&adc1Buf[0],2);
/* ADC1 init function: I enabled scan mode, continuouse mode and DMA request.
Also, I configured each channel's rank and sample time*/
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_CLOCKPRESCALER_PCLK_DIV6;
hadc1.Init.Resolution = ADC_RESOLUTION12b;
hadc1.Init.ScanConvMode = ENABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 2;
hadc1.Init.DMAContinuousRequests = ENABLE;
hadc1.Init.EOCSelection = EOC_SINGLE_CONV;
HAL_ADC_Init(&hadc1);
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_5;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_13;
sConfig.Rank = 2;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}
/*Below code is setting GPIO and DMA */
/* Peripheral clock enable */
HAL_ADC_MspInit()
{
__ADC1_CLK_ENABLE();
/**ADC1 GPIO Configuration
PC3 ------> ADC1_IN13
PA5 ------> ADC1_IN5
*/
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* 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_HALFWORD;
hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_adc1.Init.Mode = DMA_CIRCULAR; //DMA_NORMAL;
hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;
hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_adc1);
__HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);
}
#adc #stm32f4
