Edit
Have tried this as well:
msg = [0x00, 0x00, 0x01]
dev.write(0x81, msg, 0)
But still same error.
import usb.core
import usb.util
# find our device
dev = usb.core.find(idVendor=0x1267, idProduct=0x0000)
# was it found?
if dev is None:
raise ValueError('Device not found')
# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()
msg = [0x00, 0x00, 0x01]
dev.write(0x81, msg, 0)
From: morphy_richa...@hotmail.com
To: pyusb-users@lists.sourceforge.net
Date: Fri, 30 Mar 2012 14:01:32 +0000
Subject: [pyusb-users] usb.core timeout when attempting to control OWI Edge
robot arm
Hi list,
Hope I am doing this right...
I'm trying to use Python and pyusb1.0 running on a minimal VirtualBox
installation of Debian Linux to control the OWI Edge robot arm. (I'm trying to
emulate a raspberry pi that I will use in the classroom to introduce
programming and robotics, once I can actually get my hands on one)
I've been referring to this http://notbrainsurgery.livejournal.com/38622.html
for technical info about the arm.
The code I am attempting to use is:
import usb.core
import usb.util
# find our device
dev = usb.core.find(idVendor=0x1267, idProduct=0x0000)
# was it found?
if dev is None:
raise ValueError('Device not found')
# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()
dev.write(0x81, '00,00,01', 0)
Which in theory should turn on the LED at the end of the arm. When I try to run
it I get the error usb.core.USBError: Operation timed out
The code comes from the pyusb example - I also tried using the example code
from pyusb with the endpoint section in with the same result.
The details about the robot arm listed from lsusb -vv are shown at the end of
this email.
I'm a complete noob to USB - I assume that I've got the endpoint address and
bInterfaceNumber correct in the dev.write command as it came from the lsusb
-vv details ... I assume the issue is in the formatting of the data in the
write command. Writing 00 00 01 should turn on an LED at the end of the arm but
I dont know how I should format this for the write command (if that is what the
problem is; the timout occurs irrespectively of the string that's sent eg
empty: dev.write(0x81, '', 0) still gives the error)
Any help much appreciated
Kind regards,
Steve Richards
Bus 001 Device 010: ID 1267:0000 Logic3 / SpectraVideo plc
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x1267 Logic3 / SpectraVideo plc
idProduct 0x0000
bcdDevice 0.00
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 8
Device Status: 0x0000
(Bus Powered)
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