ice40web.py

ice40web.py

# -*- coding: utf-8 -*-

# Copyright 2020 by https://badge.team/
# This file is released under the "CC0 1.0 Universal" license.
# https://creativecommons.org/publicdomain/zero/1.0/legalcode

from machine import Pin, SPI
import wifi, urequests, sys

# Pins
pin_reset = Pin(16, Pin.OUT)
pin_done  = Pin(21)
pin_miso  = Pin(5)
pin_mosi  = Pin(17, Pin.OUT)
pin_sck   = Pin(19, Pin.OUT) 
pin_ss    = Pin(18, Pin.OUT)

# SPI bus
spi = SPI(1, baudrate=1000000, sck=pin_sck, mosi=pin_mosi, miso=pin_miso)

def program(data):
    # Reset the ICE40 into SPI slave download mode
    pin_reset.value(0) # FPGA into RESET
    pin_ss.value(0)    # Hold down SS pin
    pin_reset.value(1) # Take FPGA out of RESET

    print("Writing...")

    position = 0
    length   = len(data)
    while True:
        if position >= length:
            break
        spi.write(data[position:position+128])
        position += 128

    print("Sending dummy bytes...")
    spi.write(bytes([0]*100))

    print("Done")

while True:
    print("Connecting to WiFi...")
    wifi.connect()
    wifi.wait()
    print("Downloading...")
    r = urequests.get("http://10.42.1.2/example.bin")
    program(r.content)
    print("Waiting for keypress...")
    sys.stdin.read(1)