IoT-ALE: Reading and writing to SPI SDcards (Micropython)

Serial Periperal Interconnect (SPI) is one of the most ubiquitous interconnects used for "high speed" data transfers with MCUs, and for early stage system bring up (bios for example). One of the more interesting offshoots is that modern SD cards are secretly just storage devices sitting on a SPI bus. This tutorial will focus on a high level overview of SPI, the protocol, and why it's different than things like I2C, and walk through the practical example of getting an sdcard working from an MicroPyrhon.