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1
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2
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3 class BaseIO:
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4 def __init__(self):
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5 self.dummy=1
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6 self.__name__ = 'BaseIO'
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7 # please override and set __name__ to your class name
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8
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9 def golive(self):
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10 """call this if you want to promote the dummy object becomes a live object"""
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11 print "IO: %s is going live" % self.__name__
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12 self.dummy=0
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13 # you'd override with additional startup stuff here,
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14 # perhaps even loading a module and saving it to a class
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15 # attr so the subclass-specific functions can use it
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16
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17 def godummy(self):
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18 print "IO: %s is going dummy" % self.__name__
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19 self.dummy=1
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20 # you might override this to close ports, etc
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21
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22 def isdummy(self):
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23 return self.dummy
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24
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25 def __repr__(self):
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26 if self.dummy:
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27 return "<dummy %s instance>" % self.__name__
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28 else:
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29 return "<live %s instance>" % self.__name__
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30
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31 # the derived class will have more methods to do whatever it does,
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32 # and they should return dummy values if self.dummy==1.
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33
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34 class ParportDMX(BaseIO):
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35 def __init__(self, dimmers=68):
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36 BaseIO.__init__(self)
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37 self.__name__='ParportDMX'
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38 self.dimmers = dimmers
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39
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40 def golive(self):
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41 BaseIO.golive(self)
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42 import parport
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43 self.parport = parport
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44 self.parport.getparport()
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45
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46 def sendlevels(self, levels):
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47 if self.dummy:
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48 return
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49
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50 levels = list(levels) + [0]
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51 # if levels[14] > 0: levels[14] = 100 # non-dim
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52 self.parport.outstart()
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53 for p in range(1, self.dimmers + 2):
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54 self.parport.outbyte(levels[p-1]*255 / 100)
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55
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56 class SerialPots(BaseIO):
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57 """
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58 this is a dummy object (that returns zeros forever) until you call startup()
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59 which makes it bind to the port, etc
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60
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61 """
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62 def __init__(self):
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63 # no init here- call getport() to actually initialize
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64 self.dummy=1
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65 self.__name__='SerialPots' # i thought this was automatic!
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66
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67 def golive(self):
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68 """
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69 ls -l /dev/i2c-0
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70 crw-rw-rw- 1 root root 89, 0 Jul 11 12:27 /dev/i2c-0
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71 """
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72 import serport
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73 self.serport = serport
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74
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75 self.f = open("/dev/i2c-0","rw")
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76
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77 # this is for a chip with A0,A1,A2 lines all low:
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78 port = 72
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79
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80 from fcntl import *
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81
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82 I2C_SLAVE = 0x0703 #/* Change slave address */
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83 ioctl(self.f,I2C_SLAVE,port)
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84 self.dummy=0
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85
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86 def godummy(self):
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87 BaseIO.godummy(self)
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88 self.f.close()
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89
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90 def getlevels(self):
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91 if self.dummy:
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92 return (0,0,0,0)
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93 else:
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94 return self.serport.read_all_adc(self.f.fileno())
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95
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96
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97 if __name__=='__main__':
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98
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99 """ tester program that just dumps levels for a while """
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100 from time import sleep
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101 from serport import *
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102
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103 i=0
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104 while i<100:
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105 sleep(.033)
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106 i=i+1
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107
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108 print read_all_adc(f.fileno())
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109
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