64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
# (c) Copyright 2018 by Coinkite Inc. This file is covered by license found in COPYING-CC.
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#
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# numpad.py - Base class for numeric keypads. Touch or membrane matrix.
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#
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import utime
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from queues import Queue
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class NumpadBase:
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KEYS = '0123456789xy'
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# this signals a need to stop user interaction and re-look at ux stack
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ABORT_KEY = '\xff'
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def __init__(self):
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# once pressed, and released; keys show up in this queue
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self._changes = Queue(24)
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self.key_pressed = ''
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self.debug = 0 # 0..2
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self.last_event_time = utime.ticks_ms()
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async def get(self):
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# Get keypad events. Single-character strings.
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return await self._changes.get()
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def get_nowait(self):
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# Poll if anything ready: not async!
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return self._changes.get_nowait()
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def empty(self):
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return self._changes.empty()
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def abort_ux(self):
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# pretend a key was pressed, in order to unblock things
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self.inject(self.ABORT_KEY)
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def inject(self, key):
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# fake a key press and release
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if not self._changes.full():
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self.key_pressed = ''
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self._changes.put_nowait(key)
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self._changes.put_nowait('')
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def _key_event(self, key):
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if key != self.key_pressed:
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# annouce change
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self.key_pressed = key
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if self._changes.full():
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# no space, but do a "all up" and the new event
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print('Q overflow')
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self._changes.get_nowait()
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self._changes.get_nowait()
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if key != '':
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self._changes.put_nowait('')
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self._changes.put_nowait(key)
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self.last_event_time = utime.ticks_ms()
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# EOF
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