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66 lines
1.9 KiB
66 lines
1.9 KiB
import gex
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from gex.Client import EventReport
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class DIn(gex.Unit):
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"""
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Digital input port.
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Pins are represented by bits of a control word, right-aligned.
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For example, if pins C6, C5 and C0 are selected for the unit,
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the read word has the format (bits) |<C6><C5><C0>|
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"""
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def _init(self):
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self.handlers = {}
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def _type(self):
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return 'DI'
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def read(self):
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""" Read pins """
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msg = self._query(0x00)
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pp = gex.PayloadParser(msg)
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return pp.u16()
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def arm(self, pins, auto:bool=False, confirm:bool=False):
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"""
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Arm pins for single shot event generation
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pins - array of pin indices to arm
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auto - use auto trigger (auto re-arm after hold-off)
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"""
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pb = gex.PayloadBuilder()
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pb.u16(self.pins2int(pins))
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self._send(0x02 if auto else 0x01, pb.close())
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def disarm(self, pins, confirm:bool=False):
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"""
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DisArm pins
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pins - array of pin indices to arm
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"""
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pb = gex.PayloadBuilder()
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pb.u16(self.pins2int(pins))
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self._send(0x03, pb.close())
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def on_trigger(self, sensitive_pins, callback):
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"""
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Assign a trigger callback.
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Pins are passed as a list of indices (packed), or a bitmap
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Arguments are: pins snapshot, timestamp
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"""
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for i in self.pins2list(sensitive_pins):
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self.handlers[i] = callback
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def _on_event(self, evt:EventReport):
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if evt.code == 0x00:
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# trigger interrupt
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pp = gex.PayloadParser(evt.payload)
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triggersources = pp.u16() # multiple can happen at once
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snapshot = pp.u16()
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for i in range(0,16):
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if triggersources & (1<<i):
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if i in self.handlers:
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self.handlers[i](snapshot, evt.timestamp)
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