Question
Software triggered multichannel scan - callback not triggered
Hi, I'm using a STM32F303 with 10 independent analog input channels connected to ADC1 and ADC2 (5 channels per ADC).
What I'd like to achieve is a software triggered scan of all 5+5 channels in one go and have the result copied to memory using DMA. So I went with 'dual regular simultaneous mode' where ADC1 is master and ADC2 is slave.
However, the callback functions HAL_ADC_ConvHalfCpltCallback and HAL_ADC_ConvCpltCallback never get triggered.
I've tried all combinations in ADC settings without any change - except that when using continuous mode the callback functions do get triggered. However that's not what I want - I need only one scan of all channels with the result in memory. Seems I'm lost in the rather confusing ADC settings again.
This is how my board initializes - note that DMA is initialized before ADC1 and ADC2:
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC1_Init();
MX_ADC2_Init();
MX_USART1_UART_Init();
This is how I setup ADC1:
static void MX_ADC1_Init(void) {
ADC_MultiModeTypeDef multimode = {0};
ADC_ChannelConfTypeDef sConfig = {0};
/** Common config
*/
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc1.Init.Resolution = ADC_RESOLUTION_10B;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 5;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
if (HAL_ADC_Init(&hadc1) != HAL_OK) {
Error_Handler();
}
/** Configure the ADC multi-mode
*/
multimode.Mode = ADC_DUALMODE_REGSIMULT;
multimode.DMAAccessMode = ADC_DMAACCESSMODE_12_10_BITS;
multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_1CYCLE;
if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_4;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_5;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
Error_Handler();
}
}
...and now for ADC2:
static void MX_ADC2_Init(void) {
ADC_ChannelConfTypeDef sConfig = {0};
/** Common config
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc2.Init.Resolution = ADC_RESOLUTION_10B;
hadc2.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.NbrOfConversion = 5;
hadc2.Init.DMAContinuousRequests = DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SEQ_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
if (HAL_ADC_Init(&hadc2) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_4;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) {
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Rank = ADC_REGULAR_RANK_5;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) {
Error_Handler();
}
}
Now for the DMA setup:
static void MX_DMA_Init(void) {
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
__HAL_RCC_DMA2_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
/* DMA2_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Channel1_IRQn);
}
Now for the actual launch of an ADC scan:
void Sensor::performMeasurement(uint32_t* buffer, uint32_t size) {
g_adcConversionComplete = false; // just a global flag
if (HAL_ADC_Start(&m_adc_handler2) != HAL_OK) {
return;
}
if (HAL_ADCEx_MultiModeStart_DMA(&m_adc_handler1, buffer, size) != HAL_OK) {
return;
}
// wait for the end of the conversion
while(!g_adcConversionComplete);
if (HAL_ADC_Stop(&m_adc_handler2) != HAL_OK) {
return;
}
if (HAL_ADCEx_MultiModeStop_DMA(&m_adc_handler1) != HAL_OK) {
return;
}
}
...and the callback functions - nothing fancy here:
extern "C" {
// Called when first half of buffer is filled
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc) {
g_adcConversionComplete = false;
}
// Called when buffer is completely filled
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) {
g_adcConversionComplete = true;
}
void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc) {
Error_Handler();
}
}