Re: [pyusb-users] ctrl_transfer failed...
2014-05-21 3:00 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
On 05/21/2014 03:36 AM, Wander Lairson Costa wrote:
2014-05-20 13:26 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
Hello...
I'm new to python (and pyusb).
I try to port some VUSB device to work with python, but get at trouble
in beggining. I can't send bytes...
here is my example (stripped from manual...)
import usb.core
import usb.util
from array import *
dev = usb.core.find(idVendor=0x16c0, idProduct=0x05df)
if dev is None:
raise ValueError('Device not found')
dev.set_configuration()
msg = 'test'
print dev.ctrl_transfer(32+128, 9, 0, 0, msg)
I guess the first argument should be just 32.
Well I want write. And bit 7 of first argument tells if this is write or
read.
and msg (at least by manual) behave as buffer for tx, and integer for
size in receive mode.
Yes, with this bit set, the request is an IN transfer, and the `msg`
parameter is (wrongly) interpreted as the length of the transfer.
--
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Re: [pyusb-users] ctrl_transfer failed...
On 05/21/2014 05:27 PM, Wander Lairson Costa wrote:
2014-05-21 3:00 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
On 05/21/2014 03:36 AM, Wander Lairson Costa wrote:
2014-05-20 13:26 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
Hello...
I'm new to python (and pyusb).
I try to port some VUSB device to work with python, but get at trouble
in beggining. I can't send bytes...
here is my example (stripped from manual...)
import usb.core
import usb.util
from array import *
dev = usb.core.find(idVendor=0x16c0, idProduct=0x05df)
if dev is None:
raise ValueError('Device not found')
dev.set_configuration()
msg = 'test'
print dev.ctrl_transfer(32+128, 9, 0, 0, msg)
I guess the first argument should be just 32.
Well I want write. And bit 7 of first argument tells if this is write or
read.
and msg (at least by manual) behave as buffer for tx, and integer for
size in receive mode.
Yes, with this bit set, the request is an IN transfer, and the `msg`
parameter is (wrongly) interpreted as the length of the transfer.
I realized that when I wan't to read from device. I'm interpreted this
bit just opposite. But have other problem with win driver and take a lot
of time to discover what are wrong. At least it works now.
--
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Re: [pyusb-users] ctrl_transfer failed...
2014-05-21 14:08 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
On 05/21/2014 05:27 PM, Wander Lairson Costa wrote:
2014-05-21 3:00 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
On 05/21/2014 03:36 AM, Wander Lairson Costa wrote:
2014-05-20 13:26 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
Hello...
I'm new to python (and pyusb).
I try to port some VUSB device to work with python, but get at trouble
in beggining. I can't send bytes...
here is my example (stripped from manual...)
import usb.core
import usb.util
from array import *
dev = usb.core.find(idVendor=0x16c0, idProduct=0x05df)
if dev is None:
raise ValueError('Device not found')
dev.set_configuration()
msg = 'test'
print dev.ctrl_transfer(32+128, 9, 0, 0, msg)
I guess the first argument should be just 32.
Well I want write. And bit 7 of first argument tells if this is write or
read.
and msg (at least by manual) behave as buffer for tx, and integer for
size in receive mode.
Yes, with this bit set, the request is an IN transfer, and the `msg`
parameter is (wrongly) interpreted as the length of the transfer.
I realized that when I wan't to read from device. I'm interpreted this
bit just opposite. But have other problem with win driver and take a lot
of time to discover what are wrong. At least it works now.
You can use the util.build_request_type function to avoid bit mistakes.
--
Best Regards,
Wander Lairson Costa
--
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Re: [pyusb-users] ctrl_transfer failed...
2014-05-20 13:26 GMT-03:00 Slavko Kocjancic esla...@gmail.com:
Hello...
I'm new to python (and pyusb).
I try to port some VUSB device to work with python, but get at trouble
in beggining. I can't send bytes...
here is my example (stripped from manual...)
import usb.core
import usb.util
from array import *
dev = usb.core.find(idVendor=0x16c0, idProduct=0x05df)
if dev is None:
raise ValueError('Device not found')
dev.set_configuration()
msg = 'test'
print dev.ctrl_transfer(32+128, 9, 0, 0, msg)
I guess the first argument should be just 32.
and there is error report
Traceback (most recent call last):
File pyusbtest.py, line 13, in module
print dev.ctrl_transfer(32+128, 9, 0, 0, msg)
File /usr/local/lib/python2.7/dist-packages/usb/core.py, line 711,
in ctrl_transfer
self.__get_timeout(timeout)
File /usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py,
line 823, in ctrl_transfer
buff = _interop.as_array((0,) * data_or_wLength)
TypeError: can't multiply sequence by non-int of type 'str'
how to proceed? (python2.7 on ubuntu)
slavko.
--
Best Regards,
Wander Lairson Costa
--
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