Digilent Analog Discovery 2 Spi Spy (SDK)

[Tood]

Hi,

I am trying to implement spi_spy thru SDK.  
My C program, based on Digital_Spi_Spy.py, decodes  correctly about ~90% of the data. Sometimes it seems to loose trigger and the rest of the frame is corrupt.

The WaveForms Protocol->SPI->Spy works perfectly every time for my setup.

Included is my C code and a .jpg from my and WaveForms output log. The faulty data is marked as yellow in the left log in the picture.

I am writing in C and the spi frequency is 300kHz settings are active low, cpol 0, cpha 0.

Is there something I am missing here? How is SPI Spy implemented in WaveForms?

Best Regards,
Tood

hello.c

[attila]

Hi @Tood

The implementation in the WF app is similar to the Python example.
In the app the data reception and decoding is done in a background thread and the display in the main.
In Python probably the loop is slower. Try replacing the prints by storing data in a buffer and print/write at the end, or use threading.

[Tood]

 

Yes! That solved my problem!

Thank you for fast response!

Best Regards,

Tood

 

[attila]

Hi @Tood

I'm glad to hear that.