| author | Tero Marttila <terom@paivola.fi> |
| Thu, 01 May 2014 23:34:20 +0300 | |
| changeset 83 | 136e210fce82 |
| parent 74 | 9031dafa39d6 |
| permissions | -rw-r--r-- |
| 74 | 1 |
import collections |
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import logging; log = logging.getLogger('qmsk.dmx.control')
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import serial |
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83
136e210fce82
qmsk.dmx: new Head-based model/view; output/updates not yet implemented
Tero Marttila <terom@paivola.fi>
parents:
74
diff
changeset
|
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""" |
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136e210fce82
qmsk.dmx: new Head-based model/view; output/updates not yet implemented
Tero Marttila <terom@paivola.fi>
parents:
74
diff
changeset
|
6 |
Low-level DMX channel output. |
|
136e210fce82
qmsk.dmx: new Head-based model/view; output/updates not yet implemented
Tero Marttila <terom@paivola.fi>
parents:
74
diff
changeset
|
7 |
""" |
|
136e210fce82
qmsk.dmx: new Head-based model/view; output/updates not yet implemented
Tero Marttila <terom@paivola.fi>
parents:
74
diff
changeset
|
8 |
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| 74 | 9 |
class DMXError (Exception) : |
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def __init__ (self, **kwargs) : |
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self.kwargs = kwargs |
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def __str__ (self) : |
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return self.__doc__.strip().format(**self.kwargs) |
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class DMXCommandError (DMXError) : |
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""" |
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Command {cmd!r} failed: {out!r}
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""" |
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class DMXUnknownCommandError (DMXError) : |
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""" |
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Unknown command: {cmd!r}
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""" |
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class DMX (object) : |
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""" |
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Arudino-based DMX controller using src/hello-dmx.c over the serial port. |
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""" |
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SERIAL = '/dev/arduino' |
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SERIAL_BAUD = 9600 |
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SERIAL_TIMEOUT = 1.0 |
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@classmethod |
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def open (cls, path, baud=SERIAL_BAUD, timeout=SERIAL_TIMEOUT) : |
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return cls(serial.Serial(path, baud, timeout=timeout)) |
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def __init__ (self, io) : |
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self.io = io |
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# XXX: bug |
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self.io.write('\r')
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self.io.flush() |
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self.io.read(1) |
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def _arg (self, arg) : |
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if isinstance(arg, str) : |
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value, = arg |
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value = ord(value) |
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elif isinstance(arg, int) : |
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value = arg |
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else : |
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raise ValueError(arg) |
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if 0 <= value <= 255 : |
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return str(value) |
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else : |
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raise ValueError(value) |
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def __call__ (self, cmd, *args) : |
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out = cmd + ' ' + ' '.join(self._arg(arg) for arg in args) + '\r' |
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log.info("%s", out)
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self.io.write(out) |
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self.io.flush() |
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ret = self.io.read(len(out)) |
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if '!' in ret : |
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raise DMXCommandError(cmd=out, out=ret) |
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elif '?' in ret : |
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raise DMXUnknownCommandError(cmd=cmd) |
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def clear (self) : |
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""" |
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Set dmx = [ ] |
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i.e. start transmitting zero-length DMX packets. |
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For most lights, this seems to be equivalent to losing the DMX signal, and they retain their old state. |
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""" |
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self('c')
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def zero (self) : |
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""" |
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Set dmx = [0, ...] |
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Uses the maximum DMX packet length available. |
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""" |
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self('z')
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def out (self, *values) : |
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""" |
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Set dmx = (value, ...) |
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""" |
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self('o', *values)
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def set (self, start, *values) : |
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""" |
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Set dmx[start:] = value |
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""" |
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self('s', start, *values)
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def fill (self, start, end, *values) : |
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""" |
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Set dmx[start:end] to repetitions of (value, ...) |
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""" |
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self('f', start, end, *values)
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def range (self, start, stop, step, value) : |
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""" |
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Set dmx[start:end:step] = value |
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""" |
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self('r', start, stop, step, value)
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def __setitem__ (self, index, value) : |
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if isinstance(value, collections.Sequence) : |
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values = tuple(value) |
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else : |
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values = (value, ) |
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if isinstance(index, slice) : |
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if index.start and index.stop and index.step : |
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# XXX: single |
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self.range(index.start, index.stop, index.step, value) |
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elif index.start and index.stop : |
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self.fill(index.start, index.stop, *values) |
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elif index.start : |
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self.set(index.start, *values) |
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else : |
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raise IndexError("invalid slice: %s" % (index, ))
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else : |
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# simple set |
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self.set(index, *values) |
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