SPI Loopback Waveform - RPI3 - characteristic?

[Coco]

SPI Loopback waveform

scopephoto-20160925_171959.jpg (29.83 KiB) Viewed 413 times

I have a RPI3 and was doing a loopback test of SPI.
https://www.raspberrypi.org/documentati ... /README.md

I am able to send/receive data, but the waveform doesn't look good. Is there something wrong with my PI or do all PIs have the same "sad" looking waveform.

SPI Loopback waveform

scopephoto-20160925_171959.jpg (29.83 KiB) Viewed 413 times

[joan]

Perhaps your test set up is faulty.