Troubleshooting Eclypse Z7 DDR Buffer Demo

[boesterle]

Hi,

I am currently trying to get the mm2s_single_transfer_test program in Vitis from the DDR buffers demo (as linked below) to work on my Eclypse Z7 board. The calibration_reader_system program seems to run fine, however I seem to run into errors when trying to run the mm2s_single_transfer_test program on the board.

The screenshot attached shows the output on PuTTY when I run the program. There is also no output from Ch1 of the AWG module on the oscilloscope I have attached.

Is this a case of user error, incorrect hardware configuration, or something else simple? If more details are needed to troubleshoot this, let me know.

DDR Demo Link: https://digilent.com/reference/programmable-logic/eclypse-z7/demos/ddr-streaming

[artvvb]

Hey @boesterle

Could you confirm which Zmod port the AWG is plugged into? The hardware project is designed so that the AWG must be on port B and the Scope must be on port A. The calibration reader app would still be fine as it's just enumerating Zmods that are installed.

Thanks,

Arthur

[boesterle]

22 hours ago, artvvb said:

Hey @boesterle

Could you confirm which Zmod port the AWG is plugged into? The hardware project is designed so that the AWG must be on port B and the Scope must be on port A. The calibration reader app would still be fine as it's just enumerating Zmods that are installed.

Thanks,

Arthur

Hi @artvvb,

The AWG is indeed plugged into port B, and the scope on port A. Are there any other hardware configurations that could be problematic for this project?

[artvvb]

No other hardware configuration issues, seeing as you're getting USBUART printouts.

Could you send me the printout from the calibration reader? This could be related to a recently reported issue where the app was not able to determine the name and type of the Zmod correctly, due to names not matching expected values - see this comment: 

There's a more extensive fix in the works, but it has not yet been pushed out to Github.

Thanks,

Arthur

[boesterle]

I attached the output I get from the calibration reader. I also encountered the issue you describe when I initially ran the calibration app, and I fixed the code myself to recognize the two modules on the board. Could something similar be going on with the mm2s project?

calibration_reader_out.txt

[artvvb]

26 minutes ago, boesterle said:

Could something similar be going on with the mm2s project?

Yes. The failure indicated by the error message that the calibration was not successfully read could come from a couple of different early exits from ZmodAwg_ReadCoefficientsFromDna. Please try bypassing this one, or modify the function it calls: https://github.com/Digilent/Eclypse-Z7-SW/blob/aa2f34efc4dc63317a58bbaeb02e946c4c2d68a9/src/mm2s_single_transfer_test/src/awg_calibration.c#L75.