import machine
import time

# Interfacing a SNES-Controller with Micropython on ESP32

# Clock, Latch, Data, according to
# https://gamefaqs.gamespot.com/snes/916396-super-nintendo/faqs/5395
#
# Some colors do not match. Mine where
#  white  : 5V
#  blue   : Clock (in website yellow)
#  yellow : Latch (in webseite orange)
#  red    : Data
#  brown  : GND
#
#
#  Wiring: Clock and Latch can be directly connected to the ESP32
#    Do not use Pin 12 (used to determine voltage at boot, it seems)
#
#  To connect Data, you must use a level-converter (or a voltage divider
#  might do the trick
#

clk = machine.Pin(13, machine.Pin.OUT)
clk.value(1)
lat = machine.Pin(14, machine.Pin.OUT)
lat.value(0)
dat = machine.Pin(27, machine.Pin.IN)

while True:
    # Init: Lat for 12us high
    lat.value(1)
    time.sleep_us(12)
    lat.value(0)
    # Get values
    time.sleep_us(12)
    buttons = 0
    for b in range(16):
        clk.value(0)
        buttons |= ((1-dat.value()) << b)
        time.sleep_us(6)
        clk.value(1)
        time.sleep_us(6)
        
    print(bin(buttons))
    time.sleep_ms(100)