SPIS-MISO line

[Vybhav]

I have interfaced two Nordic nRF52840 boards with one as master an other as slave . 

In the image attached signals from down depicts Salve seelct,SCLk MOSI and MISO of Master respectively .

Similarly from top the image depicts MISO,MOSI,SCLK and Slave select of Slave respectively.

I have configured MISO line of salve as OUTPUT and sending "0x00" ,but there is a small glitch which is seen on the line which appears before the clock. 

Can anyone help me in analyzing this issue and fixing it?

Thank You

Vybhav

[Turbo J]

You may need a DSO for this kind of glitch analysis, as an LA won't show the actual wave form properly.

This could likely be the result of cross talk.

[Marjeris Romero]

Hi Vybhav,

You can also open a private ticket and send your schematic and layout files to Nordic engineers so we can rule out any hardware issue.

Best Regards,

Marjeris

[Vybhav]

Thank you , i will look into and it get back. 

[Vybhav]

Hi Marjeris 

I am new to this forum,can you please tell me how to open a private ticket for this issue. 

Thank you 

Vybhav 

[Marjeris Romero]

Hi Vybhav,

But I am sorry I think I misunderstood your question. You are saying you are using two nordic nRF52840 DK boards?

Are you using the SPI Slave and the SPI Master examples unmodified from the SDK? If not you can try and test the examples from the SDK and see if you still have glitches.

Best Regards,
Marjeris