I was using ubuntu 10.04 and now updating to ubuntu 12.04 but one of my python code was working fine in ubuntu 10.04 but not in ubuntu 12.04.(Ubuntu 10.04: python version = 2.6.5, Ubuntu 12.04: python version = 2.7.3)
Here is my code.
class FTSensor:
def init(self, dev, baudrate=19200):
print ‘FTSensor: opening serial port (baudrate =’, baudrate, ‘)’
self.ftcon = serial.Serial(dev,timeout =0.1)
print ‘FTSensor: setting properties’
self.ftcon.setBaudrate(baudrate)
self.ftcon.setParity(‘N’)
self.ftcon.setStopbits(1)
self.ftcon.open()
#self.RESET_INTERVAL=1.0 #seconds until transmittion is reset to fix bug
count = 0
self.reset_time = None
self.reset()
while not self._start_query():
rospy.logwarn('FTSensor: resetting')
count = count + 1
self.reset()
if count == 10:
rospy.logfatal('FTSensor.__init__: Too many resets. Try manually restarting FT sensors.')
#self.last_access = time.time()
self.last_value = ]
def read(self):
#rospy.logwarn(‘READ’)
current_value = self.last_value
#rospy.logwarn(current_value)
#rospy.logwarn('READ-BEFORE while')
while current_value == self.last_value:
#rospy.logwarn('READ-INSIDE while')
****t = self.ftcon.read(19)****
leng = t[0]
print leng
rospy.logwarn(t)
#if we get an error message, restart
if len(t) < 1 or ord(t[0]) != 0 or len(t) < 10:
rospy.logwarn('READ-WHILE-if')
#pass
#self.reset()
print 'exiting due to if len(t) < 1 or ord(t[0]) != 0 or len(t) < 10'
print 't is', t
exit()
while not self._start_query():
#self.reset()
print 'exiting due to not self._start_query()'
print 't is', t
exit()
break
else:
#rospy.logwarn('READ-WHILE-else')
current_value = t
#current_value = binary_to_ft(t)
self.last_value = current_value
return current_value
…
I did not put the main function but the one I highlighted(t = self.ftcon.read(19))
was the problem. From ubuntu 10.04 it was fine but from ubuntu 12.04,
it gives strange values like “D R .cracked letter” The type of t is list
so it wouldnt give me a number but I have no idea where D and R came
from.
Somebody mentioned about loading the kernel module with 8250.nr_uarts=8 but I have no idea how to load them 
Is there any other proecedure I need to follow to check what I am doing wrong?
Thank you.
-Brian
