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__init__.py

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import keypad, display

display.drawFill(0x000000)
display.flush()

def on_key(key_index, pressed):
    global selectedX, selectedY, selectedKeys, singleMode
    x, y = key_index % 4, int(key_index / 4)
    currentKeySelected = False
    if (singleMode):
        if (x == selectedX and y == selectedY):
            currentKeySelected = True
    else:
        if (key_index in selectedKeys):
            currentKeySelected = True
        
    if (pressed and currentKeySelected):
        print('Cleared', key_index)
        display.flush()
        if (singleMode):
            selectedX = -1
            selectedY = -1
        else:
            selectedKeys.remove(key_index)
        display.drawPixel(x, y, 0x000000)
        display.flush()
        return
    if pressed:
        print('Pressed', key_index)
        if (singleMode):
            display.drawFill(0x000000)
            selectedX = x
            selectedY = y
        else:
            selectedKeys.add(key_index)
        display.drawPixel(x, y, 0xF8B700)
        display.flush()
    elif (currentKeySelected):
         print('Released', key_index)

keypad.add_handler(on_key)
selectedX = -1
selectedY = -1
selectedKeys = set()
singleMode = True

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MCH2022 badge?
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