STM32F051K8T6 - ADC ENABLE KILLS MCU - Debugger lost connection!

[MQuit]

I am having issues initializing and using the ADC on the STM32F051K8T6 MCU. My procedure looks as follows

whenever I debug the code with the ST-LinkV2 and reach and execute the mentioned line:

 /* enable */

 hadc.Instance->CR |= ADC_CR_ADEN;

The debugger looses the connection to the target and the MCU stops working.

Are there any known issues with this ADC ?

void HW_Init(void)
{
  HAL_Init();
  SystemClock_Config();
 
  MX_GPIO_Init();
  LED_Status(false);
  LED_Error(false);
  LED_Run(false);
 
  MX_TIM2_Init();
#ifndef __ADC_WITHOUT_DMA_
  MX_DMA_Init();
#endif
  MX_ADC_Init();
 
  /* calibrate */
  hadc.Instance->CR |= ADC_CR_ADCAL;
  while(hadc.Instance->CR & ADC_CR_ADCAL)
  {/* WAIT */}
  HAL_Delay(10);
  /* enable */
  hadc.Instance->CR |= ADC_CR_ADEN;
 
  HAL_TIM_Base_Start(&htim2);
  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1);
  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);
  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_3);
 
}
 
with:
 
 
//------------------------------------------------------------------------------
/** System Clock Configuration
*/
void SystemClock_Config(void)
{
 
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
 
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.HSI14CalibrationValue = RCC_HSI14CALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);
 
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);
 
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
 
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
 
 
//------------------------------------------------------------------------------
/* ADC init function */
void MX_ADC_Init(void)
{
  ADC_ChannelConfTypeDef sConfig;
 
    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
    */
  hadc.Instance = ADC1;
  hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION_12B;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  hadc.Init.ContinuousConvMode = DISABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
  HAL_ADC_Init(&hadc);
 
    /**Configure for the selected ADC regular channel to be converted.
    */
  sConfig.Channel = ADC_CHANNEL_3;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);
 
}
 
 
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
 
  GPIO_InitTypeDef GPIO_InitStruct;
  if(hadc->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */
 
  /* USER CODE END ADC1_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_ADC1_CLK_ENABLE();
 
    /**ADC GPIO Configuration
    PA2     ------> ADC_IN2
    */
    GPIO_InitStruct.Pin = GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
  /* USER CODE BEGIN ADC1_MspInit 1 */
    /* Peripheral DMA init*/
#ifndef __ADC_WITHOUT_DMA_
	hdma_adc.Instance = DMA1_Channel1;
	hdma_adc.Init.Direction = DMA_PERIPH_TO_MEMORY;
	hdma_adc.Init.PeriphInc = DMA_PINC_DISABLE;
	hdma_adc.Init.MemInc = DMA_MINC_ENABLE;
	hdma_adc.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
	hdma_adc.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
	hdma_adc.Init.Mode = DMA_CIRCULAR;
	hdma_adc.Init.Priority = DMA_PRIORITY_LOW;
	HAL_DMA_Init(&hdma_adc);
 
	__HAL_LINKDMA(hadc,DMA_Handle,hdma_adc);
  /* USER CODE END ADC1_MspInit 1 */
#endif
  }
 
}
 
 
 

[Tesla DeLorean]

Custom board?

External pin shorts?

AVDD browning out? Tied to POR

Scope NRST and supplies as this occurs.

Debugger will drop if logic it's talking to powers down, or enters low power modes.