Hello,
I am trying to use the ADC of XMC4800 as fast as possible.
So I took the DAVE APP "ADC_MEASUREMENT" and defined sample time as 55.6nsec which results in a total conversion time of 458.333nsec.
I set "Start conversion after initialization" so that I get a first conversion. I set up a "End of measurement interrup" in which I call "ADC_MEASUREMENT_StartConversion" at the end so that it starts the next conversion.
What I now see with my oscilloscope is that I get a conversion time of around 2microsec instead of 458
The time in the interrupt routine takes about 1microsec (measured on oscilloscope with the digital IO).
Does anyone know why it takes so long? Did I miss some configurations (that is my assumption)?
Should I use other APPs?
Should I use a DMA transfer so that I can save time with not going into the interrupt routine? Nevertheless, somehow I have to read and process the ADC data. Actually I wanted to use "ADC_MEASUREMENT_GetResult()" in the interrupt to read the values, but this consume even more time for the interrupt handling and conversion time.....
Hopefully there is someone who had similar problems.
Appreciate your help!
I am trying to use the ADC of XMC4800 as fast as possible.
So I took the DAVE APP "ADC_MEASUREMENT" and defined sample time as 55.6nsec which results in a total conversion time of 458.333nsec.
I set "Start conversion after initialization" so that I get a first conversion. I set up a "End of measurement interrup" in which I call "ADC_MEASUREMENT_StartConversion" at the end so that it starts the next conversion.
What I now see with my oscilloscope is that I get a conversion time of around 2microsec instead of 458
Code:
void ADC_INT()
{
DEBUG_ON; // set Digital IO
DEBUG_OFF; // reset Digital IO
ADC_MEASUREMENT_StartConversion(&ADC_MEASUREMENT_0);
}Does anyone know why it takes so long? Did I miss some configurations (that is my assumption)?
Should I use other APPs?
Should I use a DMA transfer so that I can save time with not going into the interrupt routine? Nevertheless, somehow I have to read and process the ADC data. Actually I wanted to use "ADC_MEASUREMENT_GetResult()" in the interrupt to read the values, but this consume even more time for the interrupt handling and conversion time.....
Hopefully there is someone who had similar problems.
Appreciate your help!