void ADC_Select_CH8(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
/** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = 8;
//sConfig.SamplingTime = ADC_SAMPLETIME_160CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
/****************************************************************************************************/
/***************** Channel 0 for temperature ************************************************/
void ADC_Select_CH0(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
/** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = 0;
//sConfig.SamplingTime = ADC_SAMPLETIME_39CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
/****************************************************************************************************/
float largest(float arr[], int n)
{
int i;
// Initialize maximum element
float max = arr[0];
// Traverse array elements from second and
// compare every element with current max
for (i = 1; i < n; i++)
if (arr[i] > max)
max = arr[i];
return max;
}
/********************************************************************************
* Read J1772 ADC values
*/
void Read_J1772_ADC_Value(void)
{
ADC_Select_CH8();
//HAL_Delay(1);
for(int i=0;i<20;i++)
{
//HAL_Delay(1);
HAL_ADC_Start(&hadc);
HAL_Delay(5);
if(HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY) == HAL_OK)
{
HAL_Delay(5);
adc_raw_value2 = HAL_ADC_GetValue(&hadc); //for debugging purpose
adc_value[i] = (adc_raw_value2 * (3.3/4096));}
HAL_ADC_Stop(&hadc);
}
GetADCVal_J1772 = largest(adc_value, 20);
//dataMeterSystem.J1772_adc_val = (GetADCVal_J1772*12.34) - 21.05; //test at udaipur
// dataMeterSystem.J1772_adc_val = (7.350*GetADCVal_J1772) - 10.90; //Actual on circuit
//dataMeterSystem.J1772_adc_val = (7.350*GetADCVal_J1772) - 10.00; //Actual on circuit
dataMeterSystem.J1772_adc_val = (7.350*GetADCVal_J1772) - 8.00;
}
void Read_Temp_ADC_Value(void)
{
ADC_Select_CH0();
HAL_ADC_Start(&hadc);
if(HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY) == HAL_OK)
{
adc_raw_value = HAL_ADC_GetValue(&hadc); //for debugging purpose
adc_value[0] = (adc_raw_value * (3.3/4096));}
HAL_ADC_Stop(&hadc);
GetADCVal_Temp = adc_value[0] ;
//dataMeterSystem.Temperature = (GetADCVal_Temp*26.303833) + 2; //Actual on circuit * 26.303833)-1
dataMeterSystem.Temperature[0] = (GetADCVal_Temp*26.303833) - 2;
}
As you can see here we are using both channel to read different things PA0 is used for external temperature measurement and PB0 is used to measure input from NCV20072DR2G IC but the data from the IC get's distorted after some time
