Question
How to read 3 channel ADC with DMA
Posted on January 13, 2016 at 16:16
Hi
I'm using STM32f7 Discovery board.I want to read 3 channel adc with DMA.I currently run a single channel.But I could not run three channels. I want to use ADC3 Channel 6, Channel 7 and Channel 8 This is ADC config code/**
* @brief ADC configuration
* @param htim : ADC handle
* @retval None
*/
static void ADC_Config(void)
{
ADC_ChannelConfTypeDef sConfig;
/*##-1- Configure the ADC peripheral #######################################*/
AdcHandle.Instance = ADC3;
AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV4;
AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AdcHandle.Init.NbrOfConversion = 3;
AdcHandle.Init.ScanConvMode = ENABLE; /* Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1) */
AdcHandle.Init.ContinuousConvMode = DISABLE; /* Continuous mode disabled to have only 1 conversion at each conversion trig */
AdcHandle.Init.DiscontinuousConvMode = DISABLE; /* Parameter discarded because sequencer is disabled */
AdcHandle.Init.NbrOfDiscConversion = 0;
AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; /* Conversion start trigged at each external event */
AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIG2_T2_TRGO;
AdcHandle.Init.DMAContinuousRequests = ENABLE;
AdcHandle.Init.EOCSelection = DISABLE;
if (HAL_ADC_Init(&AdcHandle) != HAL_OK)
{
/* ADC initialization Error */
}
/*##-2- Configure ADC regular channel ######################################*/
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK)
{
/* Channel Configuration Error */
}
/*##-3- Start the conversion process #######################################*/
if(HAL_ADC_Start_DMA(&AdcHandle, (uint32_t*)&uhADCxConvertedValue[0], 3) != HAL_OK)
{
/* Start Conversation Error */
}
}