USB Logic Analyzer Device with EMI Ferrite Ring USB Cable 24MHz 8CH 24MHz 8 Channel UART IIC SPI Debug for Arduino ARM FPGA M100 SCM: Amazon.com: Industrial & Scientific
Long distance SPI: Lessons learned – Dangerous Prototypes
led - Can the length of a wire impact SPI transmission? - Electrical Engineering Stack Exchange
QuinLED-Dig-Uno Wiring Guide - quinled.info
What is the Maximum Speed We Can Achieve Between the Cheetah SPI Host Adapter and the Target SPI Device? - Total Phase
How to safely pass the SPI signal over long distances? - The Symmetrizer