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annotate bcf2000.py @ 2350:72c589cb96d1

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looknig for a bug
author drewp@bigasterisk.com
date Sat, 03 Jun 2023 15:45:27 -0700
parents 02eb0e99bba5
children
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1 #!/usr/bin/python
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2
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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 from typing import Dict
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8
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9
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10 class BCF2000(object):
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11
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12 control = {81 : "slider1", 82 : "slider2", 83 : "slider3", 84 : "slider4",
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13 85 : "slider5", 86 : "slider6", 87 : "slider7", 88 : "slider8",
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14
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15 1 : "knob1", 2 : "knob2", 3 : "knob3", 4 : "knob4",
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16 5 : "knob5", 6 : "knob6", 7 : "knob7", 8 : "knob8",
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17
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18 33 : "button-knob1", 34 : "button-knob2",
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19 35 : "button-knob3", 36 : "button-knob4",
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20 37 : "button-knob5", 38 : "button-knob6",
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21 39 : "button-knob7", 40 : "button-knob8",
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22
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23 65 : "button-upper1", 66 : "button-upper2",
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24 67 : "button-upper3", 68 : "button-upper4",
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25 69 : "button-upper5", 70 : "button-upper6",
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26 71 : "button-upper7", 72 : "button-upper8",
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27 73 : "button-lower1", 74 : "button-lower2",
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28 75 : "button-lower3", 76 : "button-lower4",
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29 77 : "button-lower5", 78 : "button-lower6",
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30 79 : "button-lower7", 80 : "button-lower8",
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31 89 : "button-corner1", 90 : "button-corner2",
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32 91 : "button-corner3", 92 : "button-corner4",
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33 }
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34
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35 def __init__(self, dev="/dev/snd/midiC2D0"):
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36 """device was usually /dev/snd/midiC1D0 but then it showed up
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37 once as C0D0. It should be autodetected"""
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38 self.devPath = dev
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39 self.dev = None
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40 self.lastValue: Dict[str, int] = {} # control name : value
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41 self.reopen()
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42 self.packet = b""
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43 loop = LoopingCall(self.poll)
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44 loop.start(.01)
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45
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46 def poll(self):
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47 try:
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48 newData = self.dev.read(3)
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49 except (IOError, AttributeError):
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50 return
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51 if newData is None:
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52 return
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53 self.packet += newData
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54 if len(self.packet) == 3:
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55 p = self.packet
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56 self.packet = b""
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57 self.packetReceived(p)
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58
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59 def packetReceived(self, packet):
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60 b0, which, value = packet
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61 if b0 != 0xb0:
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62 return
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63 if which in self.control:
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64 name = self.control[which]
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65 if name.startswith("button-"):
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66 value = value > 0
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67 self.lastValue[name] = value
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68 self.valueIn(name, value)
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69 else:
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70 print("unknown control %s to %s" % (which, value))
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71
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72 def reopen(self):
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73 if self.dev is not None:
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74 try:
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75 self.dev.close()
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76 except IOError:
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77 pass
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78
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79 self.lastValue.clear()
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80 self.dev = open(self.devPath, "rb+", buffering=0)
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81 twisted.internet.fdesc.setNonBlocking(self.dev)
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82
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83 def valueIn(self, name, value):
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84 """override this with your handler for when events come in
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85 from the hardware"""
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86 print("slider %s to %s" % (name, value))
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87 if name == 'slider1':
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88 for x in range(2, 8 + 1):
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89 v2 = int(64 + 64 * math.sin(x / 3 + value / 10))
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90 self.valueOut('slider%d' % x, v2)
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91 for x in range(1, 8 + 1):
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92 self.valueOut('button-upper%s' % x, value > x * 15)
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93 self.valueOut('button-lower%s' % x, value > (x * 15 + 7))
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94
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95 def valueOut(self, name, value):
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96 """call this to send an event to the hardware"""
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97 if self.dev is None:
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98 return
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99
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100 value = int(value)
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101 if self.lastValue.get(name) == value:
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102 return
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103 self.lastValue[name] = value
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104 which = [k for k, v in list(self.control.items()) if v == name]
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105 assert len(which) == 1, "unknown control name %r" % name
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106 if name.startswith('button-'):
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107 value = value * 127
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108 #print "bcf: write %s %s" % (name, value)
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109 self.dev.write(bytes([0xb0, which[0], int(value)]))
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110
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111 def close(self):
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112 self.dev.close()
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113 self.dev = None
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114
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115
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116 if __name__ == '__main__':
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117 b = BCF2000()
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118 reactor.run()