adc - Reading internal temperature sensor STM32

I'm trying to read internal temperature sensor. Each time, the value from ADC conversion is 296 which results in negative temperature. Should I add something to the code below, enable some peripheral or my calculations are wrong?

#define TEMP_SENSOR_AVG_SLOPE_MV_PER_CELSIUS                        2.5f
#define TEMP_SENSOR_VOLTAGE_MV_AT_25                                760.0f
#define ADC_REFERENCE_VOLTAGE_MV                                    1210.0f
#define ADC_MAX_OUTPUT_VALUE                                        4095.0f


int32_t sensorValue, temperature;

__HAL_ADC_ENABLE(&hadc1);

// Disable Vbat signal from input channel and wake up temp sensor from power down mode
ADC->CCR &= ~(ADC_CCR_TSVREFE);


HAL_ADC_Start(&hadc1);
if(HAL_ADC_PollForConversion(&hadc1, 100) == HAL_OK)

{
    sensorValue = (int32_t)HAL_ADC_GetValue(&hadc1);
    HAL_ADC_Stop(&hadc1);
    sensorValue = sensorValue * ADC_REFERENCE_VOLTAGE_MV / ADC_MAX_OUTPUT_VALUE;
    temperature = (int32_t)((sensorValue - TEMP_SENSOR_VOLTAGE_MV_AT_25) / TEMP_SENSOR_AVG_SLOPE_MV_PER_CELSIUS + 25);
}
else
{
    temperature = -273;
}


return temperature;

--EDIT

#define TEMP_SENSOR_AVG_SLOPE_MV_PER_CELSIUS                        2.5f
#define TEMP_SENSOR_VOLTAGE_MV_AT_25                                760.0f
#define ADC_REFERENCE_VOLTAGE_MV                                    3300.0f
#define ADC_MAX_OUTPUT_VALUE                                        4095.0f
#define TEMP110_CAL_VALUE                                           ((uint16_t*)((uint32_t)0x1FFF7A2E))
#define TEMP30_CAL_VALUE                                            ((uint16_t*)((uint32_t)0x1FFF7A2C))

#define TEMP110                                                     110.0f
#define TEMP30                                                      30.0f

int32_t temperature;
float sensorValue;
float adcCalValue30 = (float)(*TEMP30_CAL_VALUE);
float adcCalValue110 = (float)(*TEMP110_CAL_VALUE);

__HAL_ADC_ENABLE(&hadc1);


// Disable Vbat signal from input channel and wake up temp sensor from power down mode
ADC->CCR |= ADC_CCR_TSVREFE;
ADC->CCR &= ~ADC_CCR_VBATE ;


HAL_ADC_Start(&hadc1);
if(HAL_ADC_PollForConversion(&hadc1, 100) == HAL_OK)
{
    sensorValue = (float)HAL_ADC_GetValue(&hadc1);
    HAL_ADC_Stop(&hadc1);

    temperature = (int32_t)((TEMP110 - TEMP30) / ((float)(*TEMP110_CAL_VALUE) - (float)(*TEMP30_CAL_VALUE)) * (sensorValue - (float)(*TEMP30_CAL_VALUE)) + TEMP30);
}
else
{
    temperature = -273;
}

return temperature;

ADC configuration:

  ADC_ChannelConfTypeDef sConfig;

    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) 
    */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = DISABLE;
  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 = 1;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  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_TEMPSENSOR;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {

    Error_Handler();
  }

I'm getting the output around 35 degrees. Is it okay to have such a big offset?