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ADC conversion time

Question asked by Gaston Schelotto on Jul 8, 2015
Latest reply on Oct 7, 2015 by AITOR ARANZABAL

Hello,

I'm testing the ADC component of FRDM-KE02Z and I've set the conversion time and channels as shown

Untitled.png

Then I've created a TU1:TimerUnit_LDD to trigger the ADC conversion every 312.5us and write the next lines in the TU1_OnCounterRestart ISR.

 

(void)AD1_Measure(TRUE);
(void)AD1_GetValue16(&value[0]);

 

Finally here's the signal capture on the oscilloscope for checking the ISR process.

pic_124_2.gif

The sampling time and acquired values are okay but I expect an ADC process of 20us as I set 2 channels and a conversion time of 10us. Why I get more than 40us?

 

regards,

gaston

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