Electric IMP (https://electricimp.com) SPI SDCard interface

This source implements the MMC/SD SPI protocol for accessing/read/write data on sdcards. To use this bridge you will need to at least configure the spiBridge class with proper pinouts:

port = hardware.spi189
clk = hardware.pin1
cs = hardware.pin2
si = hardware.pin8
so = hardware.pin9