Source Code for Module pype.optix

 1  #!/usr/bin/env pypenv 
 2  # -*- Mode: Python; tab-width: 4; py-indent-offset: 4; -*- 
 3   
 4  # NOTE: THIS NEEDS THE >= 1.0 pyusb library (not the old c-based version) 
 5   
 6  VENDOR_ID  = 0x0765 
 7  PRODUCT_ID = 0xD094 
 8  BUFSIZE    = 8*16 
 9  TIMEOUT    = 20000 
10   
11  import sys, string 
12   
13 -class OptixMissingDevice(Exception): pass 
14   
15 -class Optix(): 
16 -    def __init__(self): 
17          import usb.core 
18          import usb.util 
19          self.dev = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID) 
20          if self.dev is None: 
21              raise OptixMissing 
22           
23          self.dev.set_configuration() 
24          cfg = self.dev.get_active_configuration() 
25          intf = cfg[(0,0)] 
26          self.ep_r = usb.util.find_descriptor(intf, 
27                              custom_match = \ 
28                              lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN) 
29          self.ep_w = usb.util.find_descriptor(intf, 
30                              custom_match = \ 
31                              lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT) 
32          self.dev.set_interface_altsetting(intf.bInterfaceNumber, intf.bAlternateSetting) 
33   
34          # will generate error if not attached and set's extra digit precision 
35          # at same time 
36          self.reset() 
37          self.reset() 
38          self.read('010ACF')               # extra digit resolutio 
39          self.read('0019CF')               # no black point subtraction 
40          self.read('ECF')                  # factory cal 
41          self.read('0117CF')               # enable drift compensation 
42   
43 -    def read(self, cmd): 
44          self.ep_r.clear_halt() 
45          self.ep_w.clear_halt() 
46          self.dev.write(self.ep_w.bEndpointAddress, cmd+'\r', TIMEOUT) 
47          return self.dev.read(self.ep_r.bEndpointAddress, BUFSIZE, TIMEOUT) 
48   
49 -    def reset(self): 
50          self.readstr('0PR') 
51   
52 -    def id(self): 
53          s = self.readstr('SV') 
54          return s.split('\r')[0] 
55   
56 -    def readstr(self, cmd): 
57          # is is a string of form ..results...\r<NN>, where NN is result code.. 
58          s = string.join(map(chr, self.read(cmd)), '') 
59          return s 
60           
61 -    def XYZ(self): 
62          s = self.readstr('0201RM') 
63          s = string.strip(string.split(s, '\r')[0]) 
64          return map(float,string.split(s)[1::2]) 
65       
66 -    def Yxy(self): 
67          s = self.readstr('0301RM') 
68          s = string.strip(string.split(s, '\r')[0]) 
69          return map(float,string.split(s)[1::2]) 
70   
71 -    def set_mode(self, lcd=1): 
72          if lcd: 
73              self.read('0216CF') 
74          else: 
75              self.read('0116CF') 
76   
77 -    def selfcalibrate(self): 
78          self.read('CO') 
79           
80 -    def clear(self): 
81          self.read('CE') 
82          self.read('CE') 
83          self.read('CE') 
84   
85  if __name__ == '__main__': 
86      o = Optix() 
87      o.clear() 
88      print o.id() 
89      print 'Yxy', o.Yxy() 
90      print 'XYZ', o.XYZ() 
91