Cannot start AN00231 on xCORE-200 MC AUDIO Topic is solved

[infiniteimprobability]

OK - so you're saying it works fine with the mod if you build and flash, but not when you run/debug?


Can you try from the command line? (open the xtimecomposer shell and do

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xrun bin/AN00231_ASRC_SPDIF_TO_DAC.xe

)

[dsteinwe]

I havn't found a shell view inside xtimecomposer. Therefore I have started it from the bash shell. After calling

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source SetEnv

I can run your command successfully. The question is, how can I start it from xtimecomposer?

[dsteinwe]

I haven't changed anything, but today it works. Maybe that the restart of my system has fixed the problem.

I have only one final issue with the example app. XScope doesn't work. I configured as in the manual described "Run Configurations > Target I/O > xSCOPE via xCONNECT" and switched XScope to real-time mode. On starting the perspective "trace" is shown, but all the time is "disconnected" displayed and I cannot enable it with any button. Can you reproduce this issue?

[infiniteimprobability]

Glad it works! If it's running from the command line (forgot to say you could add

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--xscope 

argument to see prints) then fundamentally it's working.

"Run Configurations > Target I/O > xSCOPE via xCONNECT" and switched XScope to real-time mode.

xscope is many things - at a basic level it's a fast print mechanism with low intrusiveness, which is what this app uses. So "Run Configurations > Target I/O > xSCOPE via xCONNECT" is all you need to enable this.

switched XScope to real-time mode

is somethign different. That enables real time graphical scope mode. Like a normal scope, you have to add probes.

Try something like this in main.xc:

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    while (1) {
        select {
            case spdif_receive_sample(c_spdif_rx, sample, index):
                i_serial_in.push(sample, index);   //Push them into serial to block
                if(index ==0 ) xscope_int(0, sample);
            break;
        }
    }

This should plot the left channel of the SPDIF stream.

Have a play - you could plot i2s_buffer_level_from_half for example to see how well the PI loop is doing mathcing the two rates

Section 18 of the xtimecomposer guide describes graphical xscope better than I can!

[dsteinwe]

Perfect! You have helped me alot. Thank you!

[infiniteimprobability]

Just to let anyone reading this thread know that both AN00231 (ASRC using SPDIF rx) and the SPDIF library itself have been updated and are now importing and playing nicely :)

[Ross]

Lib_spdif should have these changes applied: https://github.com/xcore/sc_spdif/commi ... 19e4abe79e

[infiniteimprobability]

Lib_spdif should have these changes applied: https://github.com/xcore/sc_spdif/commi ... 19e4abe79e

No need to worry - the updated lib_spdif library (version 2.0.2) has been modified to handle entry from single or dual issue caller:

https://github.com/xmos/lib_spdif/commi ... 1e50ed546f

It has been tested with AN00231 and all seems well.

Cheers