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Synchronous EIM ALSA data read iMXq

Question asked by Abhijeet Gokar on Mar 3, 2020
Latest reply on Apr 13, 2020 by Yuri Muhin

Hi,

 

I am access FPGA connected over EIM interface in iMX6 chip attached with the SGTL5000 audio chip.

The EIM registers are configured as follows:

EIM_CS1GCR1 : 00633887

EIM_CS1GCR2 : 1

EIM_CS1RCR1 : 1C020000

EIM_CS1RCR2 : 0

EIM_CS1WCR1 : 804A240

EIM_CS1WCR2 : 0

 

When I tried to read from audio device holding the BCLK as reference (which is set as 125MHz/4 BCD=4 ), at its each rising edge and display it on the ILA of the FPGA, I do not get the signals.

 

I have referred to IMx6 reference manual, and Applications Processors for Consumer Products imx document to see the examples of EIM Synchronous burst mode. But I would like inputs for my specific problem statement of getting audio data to FPGA via Burst mode EIM.

 

Best,

Abhijeet

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