#!/usr/bin/env python3
import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(26, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(16, GPIO.IN, pull_up_down=GPIO.PUD_UP)

NULL_CHAR = chr(0)

def write_report(report):
    with open('/dev/hidg0', 'rb+') as fd:
        fd.write(report.encode())

while True:
    if not(GPIO.input(26)): # 26 = a
        write_report(NULL_CHAR*2+chr(4)+NULL_CHAR*5)
        write_report(NULL_CHAR*8)
    if not(GPIO.input(16)): # 16 = b
        write_report(chr(32)+NULL_CHAR+chr(5)+NULL_CHAR*5)
        write_report(NULL_CHAR*8)