kopia lustrzana https://github.com/micropython/micropython-lib
98 wiersze
3.3 KiB
Python
98 wiersze
3.3 KiB
Python
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# MicroPython USB Keyboard example
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#
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# To run this example:
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#
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# 1. Check the KEYS assignment below, and connect buttons or switches to the
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# assigned GPIOs. You can change the entries as needed, look up the reference
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# for your board to see what pins are available. Note that the example uses
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# "active low" logic, so pressing a switch or button should switch the
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# connected pin to Ground (0V).
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#
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# 2. Make sure `usb-device-keyboard` is installed via: mpremote mip install usb-device-keyboard
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#
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# 3. Run the example via: mpremote run keyboard_example.py
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#
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# 4. mpremote will exit with an error after the previous step, because when the
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# example runs the existing USB device disconnects and then re-enumerates with
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# the keyboard interface present. At this point, the example is running.
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#
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# 5. The example doesn't print anything to the serial port, but to stop it first
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# re-connect: mpremote connect PORTNAME
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#
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# 6. Type Ctrl-C to interrupt the running example and stop it. You may have to
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# also type Ctrl-B to restore the interactive REPL.
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#
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# To implement a keyboard with different USB HID characteristics, copy the
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# usb-device-keyboard/usb/device/keyboard.py file into your own project and modify
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# KeyboardInterface.
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#
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# MIT license; Copyright (c) 2024 Angus Gratton
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import usb.device
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from usb.device.keyboard import KeyboardInterface, KeyCode, LEDCode
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from machine import Pin
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import time
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# Tuples mapping Pin inputs to the KeyCode each input generates
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#
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# (Big keyboards usually multiplex multiple keys per input with a scan matrix,
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# but this is a simple example.)
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KEYS = (
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(Pin.cpu.GPIO10, KeyCode.CAPS_LOCK),
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(Pin.cpu.GPIO11, KeyCode.LEFT_SHIFT),
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(Pin.cpu.GPIO12, KeyCode.M),
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(Pin.cpu.GPIO13, KeyCode.P),
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# ... add more pin to KeyCode mappings here if needed
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)
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# Tuples mapping Pin outputs to the LEDCode that turns the output on
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LEDS = (
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(Pin.board.LED, LEDCode.CAPS_LOCK),
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# ... add more pin to LEDCode mappings here if needed
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)
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class ExampleKeyboard(KeyboardInterface):
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def on_led_update(self, led_mask):
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# print(hex(led_mask))
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for pin, code in LEDS:
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# Set the pin high if 'code' bit is set in led_mask
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pin(code & led_mask)
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def keyboard_example():
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# Initialise all the pins as active-low inputs with pullup resistors
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for pin, _ in KEYS:
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pin.init(Pin.IN, Pin.PULL_UP)
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# Initialise all the LEDs as active-high outputs
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for pin, _ in LEDS:
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pin.init(Pin.OUT, value=0)
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# Register the keyboard interface and re-enumerate
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k = ExampleKeyboard()
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usb.device.get().init(k, builtin_driver=True)
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print("Entering keyboard loop...")
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keys = [] # Keys held down, reuse the same list object
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prev_keys = [None] # Previous keys, starts with a dummy value so first
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# iteration will always send
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while True:
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if k.is_open():
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keys.clear()
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for pin, code in KEYS:
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if not pin(): # active-low
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keys.append(code)
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if keys != prev_keys:
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# print(keys)
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k.send_keys(keys)
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prev_keys.clear()
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prev_keys.extend(keys)
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# This simple example scans each input in an infinite loop, but a more
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# complex implementation would probably use a timer or similar.
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time.sleep_ms(1)
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keyboard_example()
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