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STM32F3 ADC problem with HAL library

Question asked by Ben_Othmen.Badreddin on Jan 29, 2017
Latest reply on Jan 29, 2017 by KIC8462852 EPIC204278916

Hi, I'm new to STM32 microcontrollers, now I have STM32F3Discovery board and I want to implement a signal follower.

The microcontroller read the signal from ADC1 pin A0 and generate it on DAC1 channel2.

when I have compiled my code with stdperiph the generated signal is a perfect copy, now when I tried to use HAL library using STM32CubeMX the output signal is slightly lower than the original.

 

/**************************** ADC init function generated by Cube Mx **************************/

static void MX_ADC1_Init(void)
{

ADC_MultiModeTypeDef multimode;
ADC_ChannelConfTypeDef sConfig;

 

hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
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;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}


multimode.DMAAccessMode = ADC_DMAACCESSMODE_DISABLED;
multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_1CYCLE;
if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
{
Error_Handler();
}


sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = 1;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}

}

 

/**************************** my main function **************************/

 

int main(void)
{

   HAL_Init();

   SystemClock_Config();

   MX_GPIO_Init();
   MX_ADC1_Init();
   MX_DAC_Init();

   HAL_DAC_Start(&hdac,DAC_CHANNEL_2);
   HAL_ADC_Start(&hadc1);

   while (1){
        HAL_DAC_SetValue(&hdac,DAC_CHANNEL_2,DAC_ALIGN_12B_R,HAL_ADC_GetValue(&hadc1));
   }
}

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