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SPI help for rookie


Marc1992

Question

Hi,

I bought an analog discovery few months ago and been really happy with my purchase but for one point: I'm unable to analyze spi protocol with the logic analyzer. I have no problem using the software to see slower protocol such as uart, but when it comes to spi, I can't get the settings right to see the bits in a spi line.

I'm joining a picture of the software with the data that I get...

I can confirm that actual spi data is transferring in the line that I am probing and that the analog discovery cables are at the right place.

 

Thanks for your help,

 

Marc

spihelp.jpg

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2 answers to this question

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Hi,

I am now able to see "some" data, but I am unable to see the clock signal. The sck pin is plugged in the right analog discovery I/O pin. Another thing is that the clock frequency shown by the software is really slow compared to the actual data transfer speed (I have set it to 1MHz). First byte sent was 255 and second byte was 1 (the analog discovery got that right)..

spihelp2.jpg

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