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How to get data from ADC with STM32F7

Question asked by Vera Berns on Feb 3, 2018
Latest reply on Feb 6, 2018 by Vera Berns

So I wanted to read out multiple channels from adc3 on my stm32f7 discovery. I have been able to read out one channel and set up for multiple ones, but I can't figure out how to read out per channel. I wanted to read them out by interrupt so i set the adc up like this:

hadc3.Instance = ADC3;

hadc3.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV4;
hadc3.Init.Resolution = ADC_RESOLUTION_12B;
hadc3.Init.ScanConvMode = ENABLE; /* Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1) */
hadc3.Init.ContinuousConvMode = ENABLE; /* Continuous mode enabled to have continuous conversion */
hadc3.Init.DiscontinuousConvMode = DISABLE; /* Parameter discarded because sequencer is disabled */
hadc3.Init.NbrOfDiscConversion = 0;
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; /* Conversion start trigged at each external event */
hadc3.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
hadc3.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc3.Init.NbrOfConversion = 2;
hadc3.Init.DMAContinuousRequests = DISABLE;
hadc3.Init.EOCSelection = DISABLE;

 

if (HAL_ADC_Init(&hadc3) != HAL_OK)
{
/* ADC initialization Error */
Error_Handler();
}

/*##-2- Configure ADC regular channel ######################################*/
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
sConfig.Offset = 0;

if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
/* Channel Configuration Error */
Error_Handler();
}
/*##-2- Configure ADC regular channel ######################################*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = 2;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
sConfig.Offset = 0;

if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
/* Channel Configuration Error */
Error_Handler();
}

/*##-3- Start the conversion process #######################################*/
if(HAL_ADC_Start_IT(&hadc3) != HAL_OK)
{
/* Start Conversation Error */
Error_Handler();
}

 

 

and then I have a callback where it will go when end of conversion, here i wanted to read the data out but I dont know how to read out per channel.

 

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* AdcHandle)
{

/* Get the converted value of regular channel */
ADC3ConvertedValue[0] = HAL_ADC_GetValue(AdcHandle);
ADC3ConvertedValue[1] = HAL_ADC_GetValue(AdcHandle);
char disp[50];
sprintf(disp, "%d%%", ADC3ConvertedValue[0]);
BSP_LCD_DisplayStringAtLine(1, (uint8_t*) disp);
char disp1[50];
sprintf(disp1, "%d%%", ADC3ConvertedValue[1]);
BSP_LCD_DisplayStringAtLine(2, (uint8_t*) disp1);
}

 

can anyone help me with reading this out. I dont want to use the dma because it conflicts with the lcd. Thank you.

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