kopia lustrzana https://github.com/micropython/micropython-lib
48 wiersze
1.6 KiB
Python
48 wiersze
1.6 KiB
Python
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# MicroPython USB CDC REPL example
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#
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# Example demonstrating how to use os.dupterm() to provide the
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# MicroPython REPL on a dynamic CDCInterface() serial port.
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#
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# To run this example:
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#
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# 1. Make sure `usb-device-cdc` is installed via: mpremote mip install usb-device-cdc
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#
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# 2. Run the example via: mpremote run cdc_repl_example.py
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#
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# 3. 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 second serial port. If you check (for example by running mpremote connect
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# list) then you should now see two USB serial devices.
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#
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# 4. Connect to one of the new ports: mpremote connect PORTNAME
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#
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# It may be necessary to type Ctrl-B to exit the raw REPL mode and resume the
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# interactive REPL after mpremote connects.
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#
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# MIT license; Copyright (c) 2023-2024 Angus Gratton
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import os
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import time
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import usb.device
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from usb.device.cdc import CDCInterface
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cdc = CDCInterface()
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cdc.init(timeout=0) # zero timeout makes this non-blocking, suitable for os.dupterm()
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# pass builtin_driver=True so that we get the built-in USB-CDC alongside,
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# if it's available.
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usb.device.get().init(cdc, builtin_driver=True)
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print("Waiting for USB host to configure the interface...")
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# wait for host enumerate as a CDC device...
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while not cdc.is_open():
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time.sleep_ms(100)
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# Note: This example doesn't wait for the host to access the new CDC port,
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# which could be done by polling cdc.dtr, as this will block the REPL
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# from resuming while this code is still executing.
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print("CDC port enumerated, duplicating REPL...")
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old_term = os.dupterm(cdc)
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