64 lines
2.3 KiB
Python
64 lines
2.3 KiB
Python
# MIT License
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#
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# Copyright (c) 2023 Neil Webber
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# line frequency clock
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import time
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import threading
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# The real clock runs at 50 or 60 cycles per second. However, the
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# overhead of emulated interrupts is high - as a compromise set HZ
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# to something slower than 50-60...
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HZ = 25
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class KW11:
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KW11_OFFS = 0o17546
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def __init__(self, ub):
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self._t = threading.Thread(
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target=self._cloop, args=(1/HZ, ub.intmgr), daemon=True)
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self.interrupts_enabled = False
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self.monbit = 1 # the manual says this starts as 1
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ub.register_simpleattr(self, 'LKS', self.KW11_OFFS, reset=True)
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self._t.start()
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# clock loop
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def _cloop(self, interval, imgr):
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while True:
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time.sleep(interval)
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self.monbit = 1
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# The loop runs forever (as does the real device) but only
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# generates interrupts if interrupts are enabled
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if self.interrupts_enabled:
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imgr.simple_irq(pri=6, vector=0o100)
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@property
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def LKS(self):
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return (int(self.monbit) << 7) | (int(self.interrupts_enabled) << 6)
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@LKS.setter
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def LKS(self, value):
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self.interrupts_enabled = bool(value & 0o100)
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self.monbit = bool(value & 0o200)
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