Hi Xiaofan,
Thank you for reply. I did test using "SimpleHIDWrite" and come to some
interesting observations:
(1) At first I tried "SimpleHIDWrite" and it was not detecting my
device. Then I uninstalled the driver from Driver Manager window. And then
I tried using "SimpleHIDWrite" and it is started working.
This is because, I have used "inf-wizard.exe" utility to generate the
inf file and this utility also installed it.
(2) Now my device using the windows hid driver.
Then I tried running my Python Program. The program just goes to
infinite loop after the call set_configuration() function. And does not
come out even if I press Ctrl+Z. Our terminal does not close even I use
"Task Manager". I have to shutdown PC to close the terminal.
(3) The I come across the following post. Which said, I should download
the binary snapshots and put the DLL inside windows\system32 directory.
http://www.mail-archive.com/pyusb-users@lists.sourceforge.net/msg00263.html
The I downloaded the snapshot "***2011.03.08 (pbr336)
<http://libusb-winusb-wip.googlecode.com/files/libusb_2011.03.08.7z>"*
from "http://www.libusb.org/wiki/windows_backend";.
And copied "D:\>\....\libusb_2011.03.08\MS32\dll\libusb-1.0.dll" file to
"windows\system32" folder.
(4) The I tried running my Python Program again. Bow it is not hanging
after the call to "set_configuration()" function. But it is giving the
following error:
--------------------------------
Traceback (most recent call last):
File "Display_Descriptor_Fields5.py", line 69, in <module>
dev.set_configuration()
File "C:\lang\Python27\lib\site-packages\usb\core.py", line 530, in
set_configuration
self._ctx.managed_set_configuration(self, configuration)
File "C:\lang\Python27\lib\site-packages\usb\core.py", line 91, in
managed_set_configuration
self.managed_open()
File "C:\lang\Python27\lib\site-packages\usb\core.py", line 70, in
managed_open
self.handle = self.backend.open_device(self.dev)
File "C:\lang\Python27\lib\site-packages\usb\_debug.py", line 52, in
do_trace
return f(*args, **named_args)
File "C:\lang\Python27\lib\site-packages\usb\backend\libusb10.py",
line 446, in open_device
_check(_lib.libusb_open(dev.devid, byref(handle)))
File "C:\lang\Python27\lib\site-packages\usb\backend\libusb10.py",
line 357, in _check
raise USBError(_str_error[retval.value])
usb.core.USBError: Operation not supported or unimplemented on this platform
Press any key to continue . . .
------------------------------------
Please guide me. I need the guidence, where am I wrong? My device is
simple, so I don't mind using windows driver.
Thanks,
Regards,
Prashant
On 26/04/2011 2:37 p.m., Xiaofan Chen wrote:
On Tue, Apr 26, 2011 at 8:34 AM, Prashant Patel<prash...@wipath.co.nz> wrote:
Hi,
I am new to PyUSB and libusb-win32. I am trying to send data to my HID
device to turn LED ON/OFF along with some characters to display on LCD on
the Device. As my HID Device got the ready made code from Renesas Rx62N USB
Device API. It is working fine.
How do you know it is working fine? Have you tested it with any host
program?
For example: you can try out SimpleHIDWrite as a testing tool.
http://www.lvr.com/hidpage.htm
And Even PyUSB device can read the fields of
device descriptor, configuration descriptor, interface descriptor and
endpoint descriptor.
Now I want to send 17bytes of data to my device. My device got only
Interrupt IN Endpoint-3. So I think I need to use Control Transfer to send
data to my device.
If you only have IN EP3 and you do not have an Interrupt Out Endpoint,
then yes you need to use Control transfer for OUT report.
I tried a lot different ways but it is giving me error on
the following line.
I have tried other bmRequestType but does not work.
dev.ctrl_transfer(bmRequestType=0x42, bRequest=0x09, wValue=0x02,
wIndex=0x00, data_or_wLength=msg, timeout=100)
In order for this to work, your firmware needs to support
this request.
And I think you want to use Set_Report request? Right?
You may want to read the HID Class specification first.
http://www.usb.org/developers/devclass_docs/HID1_11.pdf
7.2.2 Set_Report Request
The Set_Report request allows the host to send a report to the device,
possibly setting the state of input, output, or feature controls.
Part Description
bmRequestType 00100001
bRequest SET_REPORT (9)
wValue Report Type and Report ID
wIndex Interface
wLength Report Length
Data Report
raise USBError(errmsg)
usb.core.USBError: libusb0-dll:err [control_msg] sending control message
failed, win error: A device attached to the system is not functioning.
I have attached the descriptor files along with the file of my code.
Please guide me, what should I do to get it working. Or where am I wrong?
I think you need to work on the firmware first before trying out
pyusb.
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