[pyusb-users] usb.core.USBError: [Errno 110] Operation timed out

[Eddie A. Goble]

Hello all:

I am using a Raspberry PI 3 in attempts to control my Owi Robotic Arm via
USB with Python scripting. I am intermittently getting a "Operation timed
out" error which halts the code. 75% of the time the program runs from
start to finish with no problems. Any ideas on how I can mitigate this?
Is there a way to increase the timeout threshold? Many thanks in advance.

*Error:*

Traceback (most recent call last):

File "arm2.py", line 59, in <module>

MoveArm("ShoulderUp",4.2)

File "arm2.py", line 47, in MoveArm

RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)

File "build/bdist.linux-armv7l/egg/usb/core.py", line 711, in
ctrl_transfer

File "build/bdist.linux-armv7l/egg/usb/backend/libusb1.py", line 836, in
ctrl_transfer

File "build/bdist.linux-armv7l/egg/usb/backend/libusb1.py", line 571, in
_check

usb.core.USBError: [Errno 110] Operation timed out


*From my Python script:*

import usb.core, usb.util, time, sys

RoboArm = usb.core.find(idVendor=0x1267, idProduct=0x000)

if RoboArm is None:

raise ValueError("Arm not found")

Duration=1

def MoveArm(ArmCmd,Duration):

if ArmCmd == "Base+":

print "M5-%s : Rotate base clockwise" % Duration

ArmCmd=[0,1,0]

elif ArmCmd == "Base-":

print "M5+%s : Rotate base counter clockwise" % Duration

ArmCmd=[0,2,0]

elif ArmCmd == "ShoulderDown":

print "M4-%s : Shoulder down" % Duration

ArmCmd=[64,0,0]

elif ArmCmd == "ShoulderUp":

print "M4+%s : Shoulder up" % Duration

ArmCmd=[128,0,0]

elif ArmCmd == "ElbowDown":

print "M3-%s : Elbow down" % Duration

ArmCmd=[16,0,0]

elif ArmCmd == "ElbowUp":

print "M3+%s : Elbow up" % Duration

ArmCmd=[32,0,0]

elif ArmCmd == "WristDown":

print "M2-%s : Wrist down" % Duration

ArmCmd=[4,0,0]

elif ArmCmd == "WristUp":

print "M2+%s : Wrist up" % Duration

ArmCmd=[8,0,0]

elif ArmCmd == "GripClose":

print "M1-%s : Grip close" % Duration

ArmCmd=[2,0,0]

elif ArmCmd == "GripOpen":

print "M1+%s : Grip open" % Duration

ArmCmd=[1,0,0]

elif ArmCmd == "LightOff":

print "L1-%s : Light off" % Duration

ArmCmd=[0,0,1]

elif ArmCmd == "LightOn":

print "L1+%s : Light on" % Duration

ArmCmd=[0,0,0]

else:

print "Unknown command"

sys.exit()


RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)

time.sleep(Duration)

ArmCmd=[0,0,0]

RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)


#MoveArm("ShoulderUp",.1)

#sys.exit()


MoveArm("Base+",7.7)

MoveArm("ShoulderDown",4)

MoveArm("ElbowDown",1)

MoveArm("ElbowUp",1)

MoveArm("ShoulderUp",4.2)

MoveArm("Base-",8.4)

sys.exit()

Eddie A Goble

[Wander Lairson Costa]

Hi Eddie,

This looks like a firmware problem, at least most cases end up being a
firmware bug.

Post by Eddie A. Goble
I am using a Raspberry PI 3 in attempts to control my Owi Robotic Arm via
USB with Python scripting. I am intermittently getting a "Operation timed
out" error which halts the code. 75% of the time the program runs from
start to finish with no problems. Any ideas on how I can mitigate this? Is
there a way to increase the timeout threshold? Many thanks in advance.
File "arm2.py", line 59, in <module>
MoveArm("ShoulderUp",4.2)
File "arm2.py", line 47, in MoveArm
RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)
File "build/bdist.linux-armv7l/egg/usb/core.py", line 711, in
ctrl_transfer
File "build/bdist.linux-armv7l/egg/usb/backend/libusb1.py", line 836, in
ctrl_transfer
File "build/bdist.linux-armv7l/egg/usb/backend/libusb1.py", line 571, in
_check
usb.core.USBError: [Errno 110] Operation timed out
import usb.core, usb.util, time, sys
RoboArm = usb.core.find(idVendor=0x1267, idProduct=0x000)
raise ValueError("Arm not found")
Duration=1
print "M5-%s : Rotate base clockwise" % Duration
ArmCmd=[0,1,0]
print "M5+%s : Rotate base counter clockwise" % Duration
ArmCmd=[0,2,0]
print "M4-%s : Shoulder down" % Duration
ArmCmd=[64,0,0]
print "M4+%s : Shoulder up" % Duration
ArmCmd=[128,0,0]
print "M3-%s : Elbow down" % Duration
ArmCmd=[16,0,0]
print "M3+%s : Elbow up" % Duration
ArmCmd=[32,0,0]
print "M2-%s : Wrist down" % Duration
ArmCmd=[4,0,0]
print "M2+%s : Wrist up" % Duration
ArmCmd=[8,0,0]
print "M1-%s : Grip close" % Duration
ArmCmd=[2,0,0]
print "M1+%s : Grip open" % Duration
ArmCmd=[1,0,0]
print "L1-%s : Light off" % Duration
ArmCmd=[0,0,1]
print "L1+%s : Light on" % Duration
ArmCmd=[0,0,0]
print "Unknown command"
sys.exit()
RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)
time.sleep(Duration)
ArmCmd=[0,0,0]
RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)
#MoveArm("ShoulderUp",.1)
#sys.exit()
MoveArm("Base+",7.7)
MoveArm("ShoulderDown",4)
MoveArm("ElbowDown",1)
MoveArm("ElbowUp",1)
MoveArm("ShoulderUp",4.2)
MoveArm("Base-",8.4)
sys.exit()
Eddie A Goble
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[Cameron Davidson]

Two points:

1. the core read, write and ctrl_transfer operations have optional
timeout args. (timeout=nnn) value in milliseconds

2. If the timeout is not simply because the you need a longer timeout,
then you might benefit from something like I had to resort to:
trap the USBErorr exception and check the error code.
If it a timeout then you can try to reset/clean up or whatever is
available with your device.
Unfortunately, the timeout code varies with backend, so you need to
knows what that is. If libusb0 then you might have more problems.

Cameron.

Post by Eddie A. Goble
I am using a Raspberry PI 3 in attempts to control my Owi Robotic Arm
via USB with Python scripting. I am intermittently getting a "Operation
timed out" error which halts the code. 75% of the time the program runs
from start to finish with no problems. Any ideas on how I can mitigate
this? Is there a way to increase the timeout threshold? Many thanks in
advance.
*Error:*
File "arm2.py", line 59, in <module>
MoveArm("ShoulderUp",4.2)
File "arm2.py", line 47, in MoveArm
RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)
File "build/bdist.linux-armv7l/egg/usb/core.py", line 711, in
ctrl_transfer
File "build/bdist.linux-armv7l/egg/usb/backend/libusb1.py", line 836,
in ctrl_transfer
File "build/bdist.linux-armv7l/egg/usb/backend/libusb1.py", line 571,
in _check
usb.core.USBError: [Errno 110] Operation timed out
*From my Python script:*
import usb.core, usb.util, time, sys
RoboArm = usb.core.find(idVendor=0x1267, idProduct=0x000)
raise ValueError("Arm not found")
Duration=1
print "M5-%s : Rotate base clockwise" % Duration
ArmCmd=[0,1,0]
print "M5+%s : Rotate base counter clockwise" % Duration
ArmCmd=[0,2,0]
print "M4-%s : Shoulder down" % Duration
ArmCmd=[64,0,0]
print "M4+%s : Shoulder up" % Duration
ArmCmd=[128,0,0]
print "M3-%s : Elbow down" % Duration
ArmCmd=[16,0,0]
print "M3+%s : Elbow up" % Duration
ArmCmd=[32,0,0]
print "M2-%s : Wrist down" % Duration
ArmCmd=[4,0,0]
print "M2+%s : Wrist up" % Duration
ArmCmd=[8,0,0]
print "M1-%s : Grip close" % Duration
ArmCmd=[2,0,0]
print "M1+%s : Grip open" % Duration
ArmCmd=[1,0,0]
print "L1-%s : Light off" % Duration
ArmCmd=[0,0,1]
print "L1+%s : Light on" % Duration
ArmCmd=[0,0,0]
print "Unknown command"
sys.exit()
RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)
time.sleep(Duration)
ArmCmd=[0,0,0]
RoboArm.ctrl_transfer(0x40,6,0x100,0,ArmCmd,3)
#MoveArm("ShoulderUp",.1)
#sys.exit()
MoveArm("Base+",7.7)
MoveArm("ShoulderDown",4)
MoveArm("ElbowDown",1)
MoveArm("ElbowUp",1)
MoveArm("ShoulderUp",4.2)
MoveArm("Base-",8.4)
sys.exit()
Eddie A Goble
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