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annotate light8/io.py @ 82:65e77dc74ad8

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yippee
author dmcc
date Fri, 12 Jul 2002 10:45:05 +0000
parents 70bd142d72c2
children ae2ed47a5321
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70bd142d72c2 added a SerialPot io object and made the IO code much more elegant (in io.py)
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2 class BaseIO:
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3 def __init__(self):
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4 self.dummy=1
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5 self.__name__ = 'BaseIO'
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6 # please override and set __name__ to your class name
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8 def golive(self):
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9 """call this if you want to promote the dummy object becomes a live object"""
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10 print "IO: %s is going live" % self.__name__
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11 self.dummy=0
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12 # you'd override with additional startup stuff here,
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13 # perhaps even loading a module and saving it to a class
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14 # attr so the subclass-specific functions can use it
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15
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16 def isdummy(self):
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17 return self.dummy
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18
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19 def __repr__(self):
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20 if self.dummy:
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21 return "<dummy %s instance>" % self.__name__
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22 else:
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23 return "<live %s instance>" % self.__name__
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24
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25 # the derived class will have more methods to do whatever it does,
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26 # and they should return dummy values if self.dummy==1.
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27
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28 class ParportDMX(BaseIO):
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29 def __init__(self, dimmers=68):
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30 BaseIO.__init__(self)
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31 self.__name__='ParportDMX'
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32 self.dimmers = dimmers
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33
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34 def golive(self):
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35 BaseIO.golive(self)
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36 import parport
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37 self.parport = parport
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38 self.parport.getparport()
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39
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40 def sendlevels(self, levels):
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41 if self.dummy:
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42 return
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43
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44 levels = list(levels) + [0]
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45 # if levels[14] > 0: levels[14] = 100 # non-dim
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46 self.parport.outstart()
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47 for p in range(1, self.dimmers + 2):
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48 self.parport.outbyte(levels[p-1]*255 / 100)
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49
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50 class SerialPots(BaseIO):
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51 """
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52 this is a dummy object (that returns zeros forever) until you call startup()
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53 which makes it bind to the port, etc
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54
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55 """
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56 def __init__(self):
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57 # no init here- call getport() to actually initialize
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58 self.dummy=1
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59 self.__name__='SerialPots' # i thought this was automatic!
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60
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61 def startup(self):
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62 """
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63 ls -l /dev/i2c-0
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64 crw-rw-rw- 1 root root 89, 0 Jul 11 12:27 /dev/i2c-0
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65 """
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66 import serport
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67 self.serport = serport
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68
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69 self.f = open("/dev/i2c-0","rw")
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70
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71 # this is for a chip with A0,A1,A2 lines all low:
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72 port = 72
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73
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74 ioctl(self.f,I2C_SLAVE,port)
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75 self.dummy=0
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76
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77 def getlevels(self):
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78 if self.dummy:
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79 return (0,0,0,0)
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80 else:
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81 return self.serport.read_all_adc(self.f.fileno())
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82
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83
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84 if __name__=='__main__':
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85
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86 """ tester program that just dumps levels for a while """
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87 from time import sleep
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88 from serport import *
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89
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90 i=0
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91 while i<100:
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92 sleep(.033)
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93 i=i+1
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94
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95 print read_all_adc(f.fileno())
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96