Hi,
I have some ADC read function like this :
......
if(!UsbTmtUINT16(hw_uLeesAD(AD_Speaker))) return;
if(!UsbTmtUINT16(hw_uLeesAD(AD_Aux))) return;
.....
This example sends the speakers AD value and the Aux Ad value to a PC (and 22 other ADC's)
The code in hw_uLeesAD looks like this :
uint16_t hw_uLeesAD(TAdcInput AdcInput)
{
Ttmrf ADCTimeOut;
LDD_ADC_TSample SampleGroup[1U];
uint16_t AdcValue;
TAdcInputParamTab const *pAdcInputParamTab;
pAdcInputParamTab = &AdcInputParamTab[AdcInput];
SampleGroup[0].ChannelIdx = pAdcInputParamTab->AdInput;
POWERAD_SEL_PutVal(pAdcInputParamTab->Multiplexer);
ADC_CreateSampleGroup(ADC_DeviceData, (LDD_ADC_TSample *) SampleGroup,1U); //uses ChannelToPin[ adcCh_num]
ADC_StartSingleMeasurement(ADC_DeviceData); // Start ADC
tmrf_Start(&ADCTimeOut,0.0005);
while (!tmrf_Ok(&ADCTimeOut))
{
ADC_Main(ADC_DeviceData);
if (bADCConversionDone)
{
bADCConversionDone = 0;
if (ERR_OK == ADC_GetMeasuredValues(ADC_DeviceData,(LDD_TData *) &AdcValue))
{ // Read measured values
return AdcValue; //Capture Output
}
}
}
return 0xFFFF;
}
This code selects the correct ADC input (selected by AdcInput), and returns the ADC value from the ADC.
The problem i have is that the ADC value which is send is always the previous ADC value, so in above example i get at the PC side AD_Speaker when i expect AD_Aux. When i replace all hw_uLeesAD(AD_XXX) by constants , then it works fine.
When i run the function 2 times like this , then i receive the correct ADC value:
uint16_t adcval;
adcval = hw_uLeesAD(AD_Speaker);
if(!UsbTmtUINT16(hw_uLeesAD(AD_Speaker))) return;
adcval = hw_uLeesAD(AD_Aux);
if(!UsbTmtUINT16(hw_uLeesAD(AD_Aux))) return;
It looks like ADC_GetMeasuredValues returns a previous ADC value, but i can't find out why.
Any input is more then welcome
Thank you
