Solved
Multichannel ADC DMA solution NOT working on stm32l4xx specifically ST32L496
I am aware of the TIMER4 ADC_EXTERNALTRIG_T4_TRGO definition bug and have modified the file accordinginly . I have had this code working in single channel mode ( non DMA) but cannot get it working in multichannel DMA mode .
ADC_INIT()
{
hadc3.Instance = ADC3;
HAL_ADC_DeInit(&hadc3);
hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
hadc3.Init.Resolution = ADC_RESOLUTION_12B;
hadc3.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc3.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc3.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc3.Init.LowPowerAutoWait = DISABLE;
hadc3.Init.ContinuousConvMode = DISABLE;
hadc3.Init.NbrOfConversion = 4;
hadc3.Init.DiscontinuousConvMode = DISABLE;
hadc3.Init.NbrOfDiscConversion = 1;
hadc3.Init.ExternalTrigConv = ADC_EXTERNALTRIG_T4_TRGO;
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
hadc3.Init.DMAContinuousRequests = DISABLE;
hadc3.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
hadc3.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc3) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
/**Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
/**Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_6;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
/**Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
/**Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_10;
sConfig.Rank = ADC_REGULAR_RANK_4;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
}
In hal_msp.cpp
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc) {
GPIO_InitTypeDef GPIO_InitStruct = { 0 };
/* Peripheral clock enable */
HAL_RCC_ADC_CLK_ENABLED++;
if (HAL_RCC_ADC_CLK_ENABLED == 1) {
__HAL_RCC_ADC_CLK_ENABLE()
;
}
__HAL_RCC_GPIOC_CLK_ENABLE()
;
__HAL_RCC_GPIOF_CLK_ENABLE()
;
/* Enable clock of DMA associated to the peripheral */
__HAL_RCC_DMA1_CLK_ENABLE()
;
/**ADC3 GPIO Configuration
PF3 ------> ADC3_IN6
PF5 ------> ADC3_IN8
PF7 ------> ADC3_IN10
PC0 ------> ADC3_IN1
*/
GPIO_InitStruct.Pin = Reference_voltage_for_A_Pin | Spare_temp_sensor_channel_Pin
| Temperature_Sensor_on_Heat_sink_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG_ADC_CONTROL;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
GPIO_InitStruct.Pin = Reference_voltage_for_B_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG_ADC_CONTROL;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(Reference_voltage_for_B_GPIO_Port, &GPIO_InitStruct);
/* ADC3 DMA Init */
/* ADC3 Init */
hdma_adc3.Instance = DMA1_Channel3;
hdma_adc3.Init.Request = DMA_REQUEST_0;
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_HALFWORD;
hdma_adc3.Init.MemDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_adc3.Init.Mode = DMA_CIRCULAR;
hdma_adc3.Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_DeInit(&hdma_adc3);
HAL_DMA_Init(&hdma_adc3);
__HAL_LINKDMA(hadc, DMA_Handle, hdma_adc3);
}
Time init code not inserted . I do know the timer is running correctly
Then To start the process
MX_TIM_Init();
ADC_INIT();
HAL_TIM_Base_Start(&htim4);
HAL_ADC_Start_DMA(&hadc3, (uint32_t *) aADCxConvertedValues, ADCCONVERTEDVALUES_BUFFER_SIZE);