Commander1024
9e49484354
Provide BOOT-triggered USB CDC maintenance mode for file updates, plus onboard LED activity flashes and enhanced display status information.
40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
"""Local USB-REPL maintenance-mode selection for the T-Dongle-S3."""
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import time
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from machine import Pin
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# The T-Dongle-S3 BOOT switch connects GPIO0 to ground.
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_BUTTON_PIN = 0
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_WINDOW_MS = 1500
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active = False
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_button = None
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def button_pressed():
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"""Return whether the BOOT button is currently pressed."""
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global _button
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if _button is None:
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_button = Pin(_BUTTON_PIN, Pin.IN, Pin.PULL_UP)
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return not _button.value()
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def check_button():
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"""Return true when BOOT is pressed shortly after a normal reset.
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Do not hold BOOT while resetting: GPIO0 is also an ESP ROM boot strap and
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that combination intentionally enters the download bootloader instead.
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"""
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global active
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deadline = time.ticks_add(time.ticks_ms(), _WINDOW_MS)
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while time.ticks_diff(deadline, time.ticks_ms()) > 0:
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if button_pressed():
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# Debounce the switch and leave the user enough time to release it.
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time.sleep_ms(40)
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if button_pressed():
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active = True
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return True
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time.sleep_ms(20)
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active = False
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return False
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