ADC1 sample from 2 channels with interrupt for conversion ready

[GTanova]

Hello, 

I have two channels on ADC1 and I want to trigger a s ample separately, every two seconds from first channel and every 10th second from second channel. I am using interrupts so after the adc trigger I get an interrupt when conversion is done. But it seems i only get a sample or read it from the first channel. I am new to stm32 microcontroller so i am not sure what can be wrong. I am configering everything and using an interrupt handler for reading the ready sample. I get the interrupt after each trigger but it seems i am getting the value from the first channel. 

__HAL_RCC_VREF_CLK_ENABLE(); // enable the internal voltage reference

hadc1.Instance = ADC1;

hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;

hadc1.Init.Resolution = ADC_RESOLUTION_12B;

hadc1.Init.GainCompensation = 0;

hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;

hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;

hadc1.Init.LowPowerAutoWait = DISABLE;

hadc1.Init.ContinuousConvMode = DISABLE;

hadc1.Init.NbrOfConversion = 1;

hadc1.Init.DiscontinuousConvMode = DISABLE;

hadc1.Init.DMAContinuousRequests = DISABLE;

hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;

hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;

hadc1.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;

hadc1.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DR;

hadc1.Init.OversamplingMode = DISABLE;

ADC_RegisterHandle(&hadc1);

sConfig.SamplingTime = ADC_SAMPLETIME_391CYCLES_5;

sConfig.SingleDiff = ADC_SINGLE_ENDED;

sConfig.OffsetNumber = ADC_OFFSET_NONE;

sConfig.Offset = 0;

sConfig.Channel = ADC_CHANNEL_5;

sConfig.Rank = ADC_REGULAR_RANK_1;

HAL_ADC_ConfigChannel(&hadc1, &sConfig);

sConfig.Channel = ADC_CHANNEL_6;

sConfig.Rank = ADC_REGULAR_RANK_2;

HAL_ADC_ConfigChannel(&hadc1, &sConfig);

__HAL_ADC_CLEAR_FLAG(&adc1, ADC_FLAG_EOC);

__HAL_ADC_CLEAR_FLAG(&adc1, ADC_FLAG_OVR);

__HAL_ADC_CLEAR_FLAG(&adc1, ADC_FLAG_EOS);

HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0);

HAL_NVIC_EnableIRQ(ADC1_IRQn);

__HAL_ADC_ENABLE_IT(&adc1, ADC_IT_EOC);

if (HAL_ADC_Init(&hadc1) != HAL_OK)

{

Error_Handler();

}

 HAL_ADCEx_Calibration_Start(&hadc1, ADC_CALIB_OFFSET, ADC_SINGLE_ENDED);

Public void ADC_RegisterHandle(ADC_HandleTypeDef *handle)

{

hadc1 = handle;

}

This is my interrupt handler:

Public void ADC1_IRQHandler(void)

{

if (__HAL_ADC_GET_FLAG(adc1, ADC_FLAG_EOS)){ //test code to check set flags

if (NULL != adcValueCB) {

// just for test to see if interrupt is received

}

}

if (__HAL_ADC_GET_FLAG(adc1, ADC_FLAG_EOC)){

if (NULL != adcValueCB) {

// just for test to see if interrupt is received

}

}

if (__HAL_ADC_GET_FLAG(adc1, ADC_FLAG_OVR)){

if (NULL != adcValueCB) {

// just for test to see if interrupt is received

}

}

HAL_ADC_IRQHandler(adc1); //hal library from stm32

}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)

{

if (hadc->Instance == ADC1) {

uint32_t ch1 = HAL_ADC_GetValue(hadc); // here I always get the value from first sampled channel, channel 5

adcValueCB(&ch1); // return value to rest of the program

__HAL_ADC_CLEAR_FLAG(hadc, ADC_FLAG_OVR); // clear flags that are not cleared by getting the value

__HAL_ADC_CLEAR_FLAG(hadc, ADC_FLAG_EOS);

}

}

In the code loop I trigger the conversion:

Get the number of channel I want a sample from, sent from the rest of the program at different intervals

sConfig.Channel = inputChannel;

sConfig.Rank = GetChannelRank(inputChannel);

HAL_ADC_ConfigChannel(&adc1, &sConfig);

SysCtlDelay(10); // delay of 10 ms after changing channels to stabilize

HAL_ADC_Start_IT(&hadc1);

Is there anything I am missing?

Best regards,

Gergana