Hardkernel ODROID GO Crossbar test

crossbar-test.py

"""Hardkernel ODROID GO Crossbar test"""

import time

from machine import ADC, Pin
from micropython import const

# The crossbar pin numbers:
CROSSBAR_X = const(34)
CROSSBAR_Y = const(35)


class CrossbarHandler:
    # ADC values are around low: ~236 and high ~511
    # So the mid value is around (236+511)/2 = 373.5
    CROSSBAR_MIN_ADC_LOW = const(100)
    CROSSBAR_MIN_ADC_MID = const(370)

    def __init__(self, pin, high_callback, low_callback):
        self.adc = ADC(Pin(pin, mode=Pin.IN))
        self.adc.width(ADC.WIDTH_9BIT)
        self.adc.atten(ADC.ATTN_11DB)

        self.high_callback = high_callback
        self.low_callback = low_callback

        self.blocked = False

    def poll(self):
        value = self.adc.read()
        if value < self.CROSSBAR_MIN_ADC_LOW:
            # button released
            self.blocked = False
        elif not self.blocked:
            print(f"Crossbar ADC value: {value}")
            if value > self.CROSSBAR_MIN_ADC_MID:
                self.blocked = True
                self.high_callback()
            elif value < self.CROSSBAR_MIN_ADC_MID:
                self.blocked = True
                self.low_callback()


class Crossbar:
    def __init__(self):
        self.joy_x = CrossbarHandler(
            CROSSBAR_X, high_callback=self.left, low_callback=self.right
        )
        self.joy_y = CrossbarHandler(
            CROSSBAR_Y, high_callback=self.up, low_callback=self.down
        )

    def poll(self):
        self.joy_x.poll()
        self.joy_y.poll()

    def up(self):
        print("up")

    def down(self):
        print("down")

    def right(self):
        print("right")

    def left(self):
        print("left")


if __name__ == "__main__":
    print("Crossbar test...")
    crossbar = Crossbar()
    while True:
        crossbar.poll()
        time.sleep_ms(100)