Examples

For software SPI on ESP8266:

import max7219
from machine import Pin, SPI
spi = SPI(-1, 10000000, miso=Pin(12), mosi=Pin(13), sck=Pin(14))
display = max7219.Matrix8x8(spi, Pin(2))
display.fill(True)
display.pixel(4, 4, False)
display.show()