import time
import spidev
from evdev import UInput, ecodes as e


bus=1
device=0

spi=spidev.SpiDev()

spi.open(bus,device)

spi.max_speed_hz = 250000
spi.mode = 0

ui = UInput()

oldstate=0



def check(diffs, state, button, evcode):
#    print(hex(state))
    if diffs & button:
        ui.write(e.EV_KEY, evcode, 0 if state & button else 1)
#        print("button %4x is %1d, aka %d"%( button, 1 if state & button else 0, evcode) )



while True:
    data=spi.xfer2([0x55]*2, spi.max_speed_hz, 1000, 8)
    state=(data[0]<<8) + data[1]

    diffs = state ^ oldstate

    if diffs:
        print(' '.join([format(d,'08b') for d in data]))

        check(diffs, state, 0x8000, e.KEY_Z) # B
        check(diffs, state, 0x4000, e.KEY_A) # Y
        check(diffs, state, 0x2000, e.KEY_LEFTSHIFT) # Select
        check(diffs, state, 0x1000, e.KEY_ENTER) # Start
        check(diffs, state, 0x0800, e.KEY_UP) # Up
        check(diffs, state, 0x0400, e.KEY_DOWN) # Down
        check(diffs, state, 0x0200, e.KEY_LEFT) # Left
        check(diffs, state, 0x0100, e.KEY_RIGHT) # Right
        check(diffs, state, 0x0080, e.KEY_X) # A
        check(diffs, state, 0x0040, e.KEY_S) # X
        check(diffs, state, 0x0020, e.KEY_Q) # L
        check(diffs, state, 0x0010, e.KEY_W) # R
        ui.syn()

    oldstate=state

ui.close()