ADC trigger with timer not working

[Stabilo]

Hello,

I have a small issue with my code. I am using the NUCLEO-F746ZG board and I want to do a small program that reads an ADC triggered by a timer.

Here are my init routines (generated by CubeMX):

ADC:

 hadc1.Instance = ADC1;

 hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;

 hadc1.Init.Resolution = ADC_RESOLUTION_12B;

 hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;

 hadc1.Init.ContinuousConvMode = DISABLE;

 hadc1.Init.DiscontinuousConvMode = DISABLE;

 hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;

 hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_TRGO;

 hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;

 hadc1.Init.NbrOfConversion = 1;

 hadc1.Init.DMAContinuousRequests = ENABLE;

 hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;

 if (HAL_ADC_Init(&hadc1) != HAL_OK)

 {

   Error_Handler();

 }

 /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. 

 */

 sConfig.Channel = ADC_CHANNEL_0;

 sConfig.Rank = ADC_REGULAR_RANK_1;

 sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;

 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)

 {

   Error_Handler();

 }

TIM:

 TIM_ClockConfigTypeDef sClockSourceConfig = {0};

 TIM_MasterConfigTypeDef sMasterConfig = {0};

 htim2.Instance = TIM2;

 htim2.Init.Prescaler = 0;

 htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

 htim2.Init.Period = 3200000;

 htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

 htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

 if (HAL_TIM_Base_Init(&htim2) != HAL_OK)

 {

   Error_Handler();

 }

 sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

 if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)

 {

   Error_Handler();

 }

 sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;

 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

 if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)

 {

   Error_Handler();

 }

In my main function, I am first calling HAL_ADC_Start_IT(&hadc1) and then HAL_TIM_Base_Start(&htim2).

I am not using DMA for the moment, I want to retrieve the data by myself when the interrupt is called.

The problem is that HAL_ADC_ConvCpltCallback() is never called.

My timer is incremented as excepted, but no ADC conversions are triggered.

Could someone help me ?

Thanks!

[Stabilo · Accepted solution]

Problem solved ...

"System 2.2.1 Missed ADC triggers from TIM1/TIM8, TIM2/TIM5/TIM4/TIM6/TRGO or TGRO2 event Description The ADC external triggers for regular and injected channels by the TIM1, TIM8, TIM2, TIM5, TIM4 and TIM6 TRGO or TRGO2 events are missed at the following conditions: • Prescaler enabled on the PCLK2 clock. • TIMxCLK = 2xADCCLK and the master mode selection (MMS or MMS2 bits in the TIMx_CR2 timer register) as reset, update, or compare pulse configuration. • TIMxCLK = 4xADCCLK. Workarounds • For TIM1 and TIM8 TRGO or TRGO 2 events: select the trigger detection on both the rising and falling edges. The EXTEN[1:0] or JEXTEN[1:0] bits must be set to 0x11 in the ADC_CR2 register. • For TIM2/TIM4/TIM5/TIM6/ TRGO or TGRO2 events: enable the DAC peripheral clock in the RCC_APB1ENR register."