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ADC Conversion

Question asked by Kajol Varma on Sep 24, 2019
Latest reply on Oct 14, 2019 by David Tosenovjan

We have written code for eQADC_A in mpc5777c and set to 1.2Msps (verified using input sine wave and plotting graph of it). 

 

In eQADC_A we are using continuous scan method, with software pit3 as trigger source of 20.8us and use of DMA to request data from rfifo to the system memory.

 

For 50Hz input sine wave with pit3 timer  practically 480 samples are used instead of 960 samples which is calculated as theortically.

For 10KHz input sine wave with same pit3 timer, 5 samples are required.In order to increase the number of samples, we have used timer of 2us for 50 samples .But we are unable to obtain samples for 10KHz.

 

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