Connect FTDI SPI with ICE40 FPGA

For bitstream configuration and SPI interface to PC

The open source toolchain for ICE40 FPGA works exceptionally well. For example, APIO (link) combines synthesis, simulation and programmer into one easy-to-use CLI, which makes ICE40 FPGAs fun to play with, in strong contrast to bulky, snail-slow Xilinx FPGA toolchains.

1. FTDI SPI Bitstream to Flash Chip

Because of the free ICE40 open source toolchain, many low-price development board has spun up around ICE40 FPGAs…