STM32 ADC problem

[AAg.14]

I am using STM32F030F4P6 when I call this Function my ADC starts successfully and I can read ADC value in ADC callback but my MCU hangs at this function line what is the problem? My code is generated by st32mcubemx and my IDE is IAR. I have a problem with this line. My program print "OK1" and ADC run successfully but my MCU doesn't print "OK2". This is a part of my main code generated by cubeMX:

//##################################################################

/* USER CODE BEGIN 2 */

uint8_t ret;

printf("OK1!\r\n");

ret = HAL_ADC_Start_IT(&hadc);

if(ret != HAL_OK) printf("ERROR Start ADC\r\n");

else printf("ADC start sucess!\r\n");

printf("OK2!\r\n");

/* USER CODE END 2 */

//##################################################################

And this is my ADC init:

//##################################################################

/* Includes ------------------------------------------------------------------*/

#include "adc.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

ADC_HandleTypeDef hadc;

/* ADC init function */

void MX_ADC_Init(void)

{

ADC_ChannelConfTypeDef sConfig = {0};

/** 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 = ENABLE;

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_PRESERVED;

if (HAL_ADC_Init(&hadc) != HAL_OK)

{

Error_Handler();

}

/** Configure for the selected ADC regular channel to be converted.

*/

sConfig.Channel = ADC_CHANNEL_4;

sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;

sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;

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

{

Error_Handler();

}

}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)

{

GPIO_InitTypeDef GPIO_InitStruct = {0};

if(adcHandle->Instance==ADC1)

{

/* USER CODE BEGIN ADC1_MspInit 0 */

/* USER CODE END ADC1_MspInit 0 */

/* ADC1 clock enable */

__HAL_RCC_ADC1_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();

/**ADC GPIO Configuration

PA4 ------> ADC_IN4

*/

GPIO_InitStruct.Pin = GPIO_PIN_4;

GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;

GPIO_InitStruct.Pull = GPIO_NOPULL;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* ADC1 interrupt Init */

HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0);

HAL_NVIC_EnableIRQ(ADC1_IRQn);

/* USER CODE BEGIN ADC1_MspInit 1 */

/* USER CODE END ADC1_MspInit 1 */

}

}

void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)

{

if(adcHandle->Instance==ADC1)

{

/* USER CODE BEGIN ADC1_MspDeInit 0 */

/* USER CODE END ADC1_MspDeInit 0 */

/* Peripheral clock disable */

__HAL_RCC_ADC1_CLK_DISABLE();

/**ADC GPIO Configuration

PA4 ------> ADC_IN4

*/

HAL_GPIO_DeInit(GPIOA, GPIO_PIN_4);

/* ADC1 interrupt Deinit */

HAL_NVIC_DisableIRQ(ADC1_IRQn);

/* USER CODE BEGIN ADC1_MspDeInit 1 */

/* USER CODE END ADC1_MspDeInit 1 */

}

}

//##################################################################

This is my adc callback:

//##################################################################

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)

{

if(hadc->Instance == ADC1)

{

adc_val = HAL_ADC_GetValue(hadc);

Vin = adc_val*0.001;

//printf("ADC val:%d Vin:%f\r\n",adc_val,Vin);

}

}

//##################################################################

And this is my error callback: At this, I receive ADC ERR:2 means HAL_ADC_ERROR_OVR I am getting the ADC value in callback but this happen.

//##################################################################

void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)

{

uint32_t adc_error;

printf("ADC ERR:%d\r\n",hadc->ErrorCode);

}

[S.Ma]

callbacks are very sensitive interrupt based functions and must be as brief as possible.

I would suggest to use the DMA to scan the ADC channel continuously and cycle through a RAM array.

You can then just read at anytime the buffer and transmit in the main loop without timing pitfalls.

There should be baseline examples in cube/nucleo example projects.

[T J]

dont use printf inside interrupt

and use DMA as suggested by @S.Ma​