
This patch implements the basic SPI read/write functions for the W5500 chip. It also allows _WIZCHIP_ to be configured externally to select the specific Wiznet chip.
This is the driver for the WIZnet5x00 series of Ethernet controllers.
Adapted for MicroPython.
Original source: https://github.com/Wiznet/W5500_EVB/tree/master/ioLibrary Taken on: 30 August 2014