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Refactor temper.py #2

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2 changes: 2 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
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166 changes: 45 additions & 121 deletions temper.py
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@@ -1,134 +1,69 @@
"""
Temper - a class for managing a TEMPer USB temperature sensor

Bill Mania <bill@manialabs.us>
Original by Bill Mania <bill@manialabs.us>

Source: http://www.manialabs.us/downloads/Temper.py
"""

import usb.core
import sys
import usb.core

class Temper():

def __init__(self):
class Temper:

def __init__(self):
self.devices = []
self.calibrationConstant = 15
self.units = 'C'

self.device_list = usb.core.find(
find_all=True,
idVendor = 0x1130,
idProduct = 0x660c
)
find_all=True, idVendor=0x1130, idProduct=0x660c)
self.devices = [device for device in self.device_list]

if self.devices is None:
print 'Unable to find a temperature device'
print('Unable to find a temperature device')
return

# Try our best to detach the device from any previous state
try:
for device in self.devices:
if device.is_kernel_driver_active(0):
device.detach_kernel_driver(0)
if device.is_kernel_driver_active(1):
device.detach_kernel_driver(1)
except NotImplementedError as e:
#Note: some system do not implement is_kernel_driver_active
try:
for device in self.devices:
device.detach_kernel_driver(0)
device.detach_kernel_driver(1)
except Exception as e:
# I give up, maybe we will get lucky anyway
#print "Exception: " + e.__class__.__name__ + ": " + str(e)
pass
except Exception as e:
#print "Exception: " + e.__class__.__name__ + ": " + str(e)
pass

# Configure the device
for device in self.devices:
try:
# This attach would avoid the following kernel warning, but
# generates 2 other attach lines. A clean "claim" would be better.
# kernel warning: 'process xxx (python) did not claim interface 1 before use'
#device.attach_kernel_driver(0)
#device.attach_kernel_driver(1)
#device.reset()
device.set_configuration()
except Exception as e:
print "Error: Unable to setup the device"
print("Error: Unable to setup the device")
raise e
#print "Exception: " + e.__class__.__name__ + ": " + str(e)
#return

#
# the following sequence appear to be necessary to
# either calibrate or initialize the TEMPer, but I
# have no idea why. therefore, I named them all "magic".
#
nullTrailer = ''
for i in range(0, 24):
nullTrailer = nullTrailer + chr(0)
firstMagicSequence = chr(10) + chr(11) + chr(12) + chr(13) + chr(0) + chr(0) + chr(2) + chr(0)
firstMagicSequence = firstMagicSequence + nullTrailer
secondMagicSequence = chr(0x54) + chr(0) + chr(0) + chr(0) + chr(0) + chr(0) + chr(0) + chr(0)
secondMagicSequence = secondMagicSequence + nullTrailer
thirdMagicSequence = chr(0) + chr(0) + chr(0) + chr(0) + chr(0) + chr(0) + chr(0) + chr(0)
thirdMagicSequence = thirdMagicSequence + nullTrailer
fourthMagicSequence = chr(10) + chr(11) + chr(12) + chr(13) + chr(0) + chr(0) + chr(1) + chr(0)
fourthMagicSequence = fourthMagicSequence + nullTrailer

nullTrailer = b'\x00' * 24
firstMagicSequence = b'\n\x0B\x0C\x0D\x00\x00\x02\x00' + nullTrailer
secondMagicSequence = b'\x54\x00\x00\x00\x00\x00\x00\x00' + nullTrailer
thirdMagicSequence = b'\x00\x00\x00\x00\x00\x00\x00\x00' + nullTrailer
fourthMagicSequence = b'\n\x0B\x0C\x0D\x00\x00\x01\x00' + nullTrailer

for device in self.devices:
bytesSent = device.ctrl_transfer(
0x21,
9,
0x200,
0x1,
firstMagicSequence,
32
)
0x21, 9, 0x200, 0x1, firstMagicSequence, 32)
bytesSent = device.ctrl_transfer(
0x21,
9,
0x200,
0x1,
secondMagicSequence,
32
)
0x21, 9, 0x200, 0x1, secondMagicSequence, 32)
for i in range(0, 7):
bytesSent = device.ctrl_transfer(
0x21,
9,
0x200,
0x1,
thirdMagicSequence,
32
)
0x21, 9, 0x200, 0x1, thirdMagicSequence, 32)
bytesSent = device.ctrl_transfer(
0x21,
9,
0x200,
0x1,
fourthMagicSequence,
32
)

return
0x21, 9, 0x200, 0x1, fourthMagicSequence, 32)

def setCalibration(self, calibrationConstant):
self.calibrationConstant = calibrationConstant

return

def setUnits(self, units = 'C'):
def setUnits(self, units='C'):
self.units = units

return

def getUnits(self):
if self.units == 'C':
return 'Celsius'
Expand All @@ -140,72 +75,61 @@ def getUnits(self):
return 'Unknown'

def getTemperature(self, device):
nullTrailer = ''
for i in range(0, 24):
nullTrailer = nullTrailer + chr(0)

temperatureBuffer = device.ctrl_transfer(
0xa1,
1,
0x300,
0x1,
256,
0
)
nullTrailer = b'\x00' * 24

temperatureBuffer = device.ctrl_transfer(0xa1, 1, 0x300, 0x1, 256, 0)

if len(temperatureBuffer) > 1:
if temperatureBuffer[0] == 0 and temperatureBuffer[1] == 255:
print "Failed to retrieve temperature"
print("Failed to retrieve temperature")
return 0.0
#print temperatureBuffer
temperature = int(temperatureBuffer[0] << 8) + int(temperatureBuffer[1] & 0xff) + self.calibrationConstant

temperature = (
temperatureBuffer[0] << 8) + (temperatureBuffer[1] & 0xff) + self.calibrationConstant
temperature = temperature * (125.0 / 32000.0)

if self.units == 'F':
temperature = 9.0 / 5.0 * temperature + 32.0
temperature = (9.0 / 5.0 * temperature) + 32.0
elif self.units == 'K':
temperature = temperature + 273.15
temperature += 273.15
else:
pass

else:
print "Failed to retrieve temperature"
print("Failed to retrieve temperature")
temperature = 0.0

return temperature


if __name__ == '__main__':
temper = Temper()

for device in temper.devices:
tempc = temper.getTemperature(device)
tempcunits = temper.getUnits()
tempf = (tempc * 9/5) + 32
tempf = (tempc * 9 / 5) + 32
tempfunits = "Fahrenheit"
devicebus = device.bus
deviceaddress = device.address

if len(sys.argv) < 2:
# Example output: 0:7, 17.06 Celsius / 62.71 Fahrenheit
print '%d:%d, %0.2f %s / %0.2f %s' % (devicebus, deviceaddress, tempc, tempcunits, tempf, tempfunits)
print('%d:%d, %.2f %s / %.2f %s' %
(devicebus, deviceaddress, tempc, tempcunits, tempf, tempfunits))
else:
if sys.argv[1] == "-c":
# Example Celsius output: 17.06
print '%0.2f' % tempc
print('%.2f' % tempc)
elif sys.argv[1] == "-C":
# Example Celsius output: 17
print '%0.0f' % tempc
print('%.0f' % tempc)
elif sys.argv[1] == "-f":
# Example Fahrenheit output: 62.71
print '%0.2f' % tempf
print('%.2f' % tempf)
elif sys.argv[1] == "-F":
# Example Fahrenheit output: 62
print '%0.0f' % tempf
print('%.0f' % tempf)
else:
print "Usage: %s [options]" % sys.argv[0]
print "Options:"
print " -c # report Celsius"
print " -C # report Celsius rounded"
print " -f # report Fahrenheit"
print " -F # report Fahrenheit rounded"
print " -h # Help"
print("Usage: %s [options]" % sys.argv[0])
print("Options:")
print(" -c # report Celsius")
print(" -C # report Celsius rounded")
print(" -f # report Fahrenheit")
print(" -F # report Fahrenheit rounded")
print(" -h # Help")
sys.exit(1)