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annotate bcf2000.py @ 355:4e60444605f6

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add dmx_usb_module
author drewp@bigasterisk.com
date Wed, 13 Jun 2007 06:01:22 +0000
parents c7478a778992
children bd8a89743226
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1 #!/usr/bin/python
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2 from __future__ import division
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3 import math
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4 import twisted.internet.fdesc
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5 from twisted.internet import reactor
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6 from twisted.internet.task import LoopingCall
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7
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8 class BCF2000(object):
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9
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10 control = {81 : "slider1", 82 : "slider2", 83 : "slider3", 84 : "slider4",
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11 85 : "slider5", 86 : "slider6", 87 : "slider7", 88 : "slider8",
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12
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13 1 : "knob1", 2 : "knob2", 3 : "knob3", 4 : "knob4",
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14 5 : "knob5", 6 : "knob6", 7 : "knob7", 8 : "knob8",
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15
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16 33 : "button-knob1", 34 : "button-knob2",
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17 35 : "button-knob3", 36 : "button-knob4",
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18 37 : "button-knob5", 38 : "button-knob6",
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19 39 : "button-knob7", 40 : "button-knob8",
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20
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21 65 : "button-upper1", 66 : "button-upper2",
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22 67 : "button-upper3", 68 : "button-upper4",
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23 69 : "button-upper5", 70 : "button-upper6",
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24 71 : "button-upper7", 72 : "button-upper8",
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25 73 : "button-lower1", 74 : "button-lower2",
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26 75 : "button-lower3", 76 : "button-lower4",
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27 77 : "button-lower5", 78 : "button-lower6",
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28 79 : "button-lower7", 80 : "button-lower8",
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29 89 : "button-corner1", 90 : "button-corner2",
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30 91 : "button-corner3", 92 : "button-corner4",
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31 }
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32
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33 def __init__(self, dev="/dev/snd/midiC1D0"):
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34 self.devPath = dev
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35 self.dev = None
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36 self.reopen()
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37 self.lastValue = {} # control name : value
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38 self.packet = ""
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39 loop = LoopingCall(self.poll)
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40 loop.start(.02)
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41
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42 def poll(self):
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43 try:
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44 bytes = self.dev.read(3)
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45 except IOError, e:
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46 return
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47 if len(bytes) == 0:
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48 print "midi stall, reopen slider device"
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49 self.reopen()
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50 return
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51 self.packet += bytes
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52 if len(self.packet) == 3:
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53 p = self.packet
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54 self.packet = ""
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55 self.packetReceived(p)
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56
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57 return
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58
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59 while 1:
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60 packet = self.dev.read(3)
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61 while len(packet) < 3:
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62 if len(packet) == 0:
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63 self.reopen()
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64 packet += self.dev.read(3 - len(packet))
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65
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66 def packetReceived(self, packet):
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67 b0, which, value = [ord(b) for b in packet]
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68 if b0 != 0xb0:
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69 return
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70 if which in self.control:
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71 name = self.control[which]
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72 if name.startswith("button-"):
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73 value = value > 0
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74 self.lastValue[name] = value
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75 self.valueIn(name, value)
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76 else:
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77 print "unknown control %s to %s" % (which, value)
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78
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79 def reopen(self):
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80 if self.dev is not None:
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81 try:
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82 self.dev.close()
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83 except IOError:
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84 pass
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85
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86 self.dev = open(self.devPath, "r+")
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87 twisted.internet.fdesc.setNonBlocking(self.dev)
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88
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89 def valueIn(self, name, value):
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90 """override this with your handler for when events come in
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91 from the hardware"""
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92 print "slider %s to %s" % (name, value)
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93 if name == 'slider1':
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94 for x in range(2,8+1):
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95 v2 = int(64 + 64 * math.sin(x / 3 + value / 10))
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96 self.valueOut('slider%d' % x, v2)
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97 for x in range(1,8+1):
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98 self.valueOut('button-upper%s' % x, value > x*15)
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99 self.valueOut('button-lower%s' % x, value > (x*15+7))
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100
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101 def valueOut(self, name, value):
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102 """call this to send an event to the hardware"""
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103 value = int(value)
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104 if self.lastValue.get(name) == value:
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105 return
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106 self.lastValue[name] = value
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107 which = [k for k,v in self.control.items() if v == name]
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108 assert len(which) == 1, "unknown control name %r" % name
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109 if isinstance(value, bool):
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110 value = value * 127
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111 self.dev.write(chr(0xb0) + chr(which[0]) + chr(int(value)))
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112
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113
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114 if __name__ == '__main__':
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115 b = BCF2000()
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116 reactor.run()