How to safely pass the SPI signal over long distances? - The Symmetrizer
Calculate maximum speed: SPI Host Adapter with long cables and LVDS - Total Phase Blog
Doing One Better: A Look at 1-Wire Simplicity | Bench Talk
Intro to Communication in Robotics Application: CANOpen, EtherCAT, RS-232, and Their OSI Model. (Including USB, I2C, SPI, UART, CAN, Ethernet, etc. ~ shannonleeeee
What Could Go Wrong: SPI | Hackaday
spi - Short Distance Board to Board Communication - Electrical Engineering Stack Exchange
Calculate maximum speed: SPI Host Adapter with long cables and LVDS - Total Phase Blog
Is There an SPI Trace Impedance Requirement? | Zach Peterson | PCB Routing
SPI max distance - Electrical Engineering Stack Exchange
Maximum distance using a serial port - General Electronics - Arduino Forum