Posted on January 26, 2016 at 20:03 Hello. I try to make a simple non-continuous ADC-DMA transaction of 10 measurements. I get only one sample in my array. I don't use interrupts, just wait for DMA completion. Could you tell, what I am doing wrong?
Here are my functions (I am sorry if there exist some codebox tag and I did not notice it):
UINT16 Adc1ShortReadBuf[10];
void Get10Samples(void)
{
DMA_HandleTypeDef DmaHandle1;
DmaHandle1.Init.Channel = DMA_CHANNEL_0;
DmaHandle1.Instance = DMA2_Stream4;
HAL_DMA_DeInit(&DmaHandle1);
DmaHandle1.Init.Direction = DMA_PERIPH_TO_MEMORY;
DmaHandle1.Init.PeriphInc = DMA_PINC_DISABLE;
DmaHandle1.Init.MemInc = DMA_MINC_ENABLE;
DmaHandle1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
DmaHandle1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
DmaHandle1.Init.Mode = DMA_NORMAL;
DmaHandle1.Init.Priority = DMA_PRIORITY_HIGH;
DmaHandle1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
DmaHandle1.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL;
DmaHandle1.Init.MemBurst = DMA_MBURST_SINGLE;
DmaHandle1.Init.PeriphBurst = DMA_PBURST_SINGLE;
HAL_DMA_Init(&DmaHandle1);
ADC_ChannelConfTypeDef sConfig;
sConfig.SamplingTime = ADC_SAMPLETIME_112CYCLES;
sConfig.Rank = 1;
sConfig.Offset = 0;
ADC_HandleTypeDef AdcHandle1;
ADC_MultiModeTypeDef multimode;
AdcHandle1.Instance = ADC1;
HAL_ADC_DeInit(&AdcHandle1);
AdcHandle1.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV8 ;
AdcHandle1.Init.Resolution = ADC_RESOLUTION12b;
AdcHandle1.Init.ScanConvMode = DISABLE;
AdcHandle1.Init.ContinuousConvMode = DISABLE;
AdcHandle1.Init.DiscontinuousConvMode = DISABLE;
AdcHandle1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AdcHandle1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
AdcHandle1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AdcHandle2.Init.NbrOfDiscConversion = 0;
AdcHandle1.Init.NbrOfConversion = 1;
AdcHandle1.Init.DMAContinuousRequests = DISABLE;
AdcHandle1.Init.EOCSelection = DISABLE;
HAL_ADC_Init(&AdcHandle1);
multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_5CYCLES;
multimode.Mode = ADC_MODE_INDEPENDENT;
multimode.DMAAccessMode = ADC_DMAACCESSMODE_DISABLED;
HAL_ADCEx_MultiModeConfigChannel(&AdcHandle1, &multimode);
DMA_ClearTCFlag(&DmaHandle1);
sConfig.Channel = ADC_CHANNEL_0;
HAL_ADC_ConfigChannel(&AdcHandle1, &sConfig);
__HAL_LINKDMA(&AdcHandle1, DMA_Handle, DmaHandle1);
ADC_DMA_start(&AdcHandle1, (uint32_t*)Adc1ShortReadBuf, 10);
}
HAL_StatusTypeDef ADC_DMA_start(ADC_HandleTypeDef* hadc, uint32_t* pData, uint32_t Length)
{
__IO uint32_t counter = 0;
/* Enable ADC DMA mode */
hadc->Instance->CR2 |= ADC_CR2_DMA;
/* Set src and dst addresses and length*/
HAL_DMA_Start(hadc->DMA_Handle, (uint32_t)&hadc->Instance->DR, (uint32_t)pData, Length);
/* Check if ADC peripheral is disabled in order to enable it and wait during
Tstab time the ADC's stabilization */
if((hadc->Instance->CR2 & ADC_CR2_ADON) != ADC_CR2_ADON)
{
/* Enable the Peripheral */
__HAL_ADC_ENABLE(hadc);
/* Delay for ADC stabilization time */
/* Compute number of CPU cycles to wait for */
counter = (ADC_STAB_DELAY_US * (SystemCoreClock / 1000000));
while(counter != 0)
{
counter--;
}
}
hadc->Instance->CR2 |= ADC_CR2_SWSTART;
/* Return function status */
return HAL_OK;
}
Solved it. Conversion has to be continuous. Actually, the post can be deleted.
AB
