Looks like I found the answer to my problem.
On this page http://www.libusb.org/wiki/APIs, I've read :
"libusb is not suited for HID class devices. While it is possible to use
libusb with HID class devices it requires the original HID class driver
to be replaced by a driver which supports libusb, and this leads to a
quite poor user experience on any platform other than Linux. It is
recommended to use HIDAPI <http://www.signal11.us/oss/hidapi/> instead.
HIDAPI provides convenient cross-platform access to HID class devices
and can do so without any kernel driver concerns across all supported
platforms."
Nicolas
Le 28/01/2016 08:21, Nicolas Pinault a écrit :
Hi,
I'm trying to use a USB device under Windows7x64.
The device is HID like with custom protocol.
The USB device is recognised by Windows as a HID device (without error
nor warning shown is device manager).
It works perfectly with a host running QNX OS.
With PyUSB :
Discovery of the device is OK.
Configuration of the device seems to be OK.
Reading/writing the device fails.
Here is the code I use :
import usb.core
import usb.util
class Test(object):
def __init__(self):
self.VendorId = 0x15A2
self.ProductId = 0x0073
self.dev = usb.core.find(idVendor=self.VendorId,
idProduct=self.ProductId)
if not self.dev :
raise ValueError("Device not found")
print self.dev
self.dev.set_configuration()
cfg = self.dev.get_active_configuration()
intf = cfg[(0,0)]
self.interface = cfg[(0,0)].bInterfaceNumber
self.dev.set_interface_altsetting(interface = self.interface,
alternate_setting = self.interface)
print "Interface :", self.interface
self.DeviceSetIdle()
def DeviceSetIdle(self):
self.dev.ctrl_transfer(bmRequestType =
usb.util.build_request_type(usb.util.CTRL_OUT,
usb.util.CTRL_TYPE_CLASS,
usb.util.CTRL_RECIPIENT_INTERFACE),
bRequest = USB_HID_SET_IDLE_REQUEST,
# 0x0A
wValue = 0,#8 << 8,
wIndex = self.interface,
data_or_wLength = None,
timeout = 0)
if __name__ == '__main__':
t = Test()
I get the following output :
DEVICE ID 15a2:0073 on Bus 003 Address 023 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x200 USB 2.0
bDeviceClass : 0x0 Specified at interface
bDeviceSubClass : 0x0
bDeviceProtocol : 0x0
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x15a2
idProduct : 0x0073
bcdDevice : 0x2 Device 0.02
iManufacturer : 0x1 Freescale Semiconductor Inc.
iProduct : 0x2 Kinetis Bootloader
iSerialNumber : 0x0
bNumConfigurations : 0x1
CONFIGURATION 1: 100 mA ==================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x29 (41 bytes)
bNumInterfaces : 0x1
bConfigurationValue : 0x1
iConfiguration : 0x0
bmAttributes : 0xc0 Self Powered
bMaxPower : 0x32 (100 mA)
INTERFACE 0: Human Interface Device ====================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x0
bAlternateSetting : 0x0
bNumEndpoints : 0x2
bInterfaceClass : 0x3 Human Interface Device
bInterfaceSubClass : 0x0
bInterfaceProtocol : 0x0
iInterface : 0x0
ENDPOINT 0x81: Interrupt IN ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x81 IN
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x40 (64 bytes)
bInterval : 0xa
ENDPOINT 0x2: Interrupt OUT ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x2 OUT
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x40 (64 bytes)
bInterval : 0xa
Interface : 0
Traceback (most recent call last):
File
"Z:\Cantar2\Processeur\Apps_2\PyCantarem2Update\src\PyCantarem2Update.py",
line 244, in <module>
t = Test()
File
"Z:\Cantar2\Processeur\Apps_2\PyCantarem2Update\src\PyCantarem2Update.py",
line 154, in __init__
self.DeviceSetIdle()
File
"Z:\Cantar2\Processeur\Apps_2\PyCantarem2Update\src\PyCantarem2Update.py",
line 174, in DeviceSetIdle
timeout = 0)
File "C:\Python27\lib\site-packages\usb\core.py", line 1043, in
ctrl_transfer
self.__get_timeout(timeout))
File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line
883, in ctrl_transfer
timeout))
File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line
595, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 22] Invalid parameter
As I am far from a USB ninja, I spent days documenting myself and
searching the Internet for a solution without success.
What's wrong with my code ?
Nicolas
--
*Nicolas PINAULT
R&D electronics engineer
*** nico...@aaton.com <mailto:nico...@aaton.com>
*AATON-Digital*
38000 Grenoble - France
Tel +33 4 7642 9550
http://www.aaton.com
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French Technologies for Film and Digital Cinematography
Follow us on Twitter
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--
*Nicolas PINAULT
R&D electronics engineer
*** nico...@aaton.com <mailto:nico...@aaton.com>
*AATON-Digital*
38000 Grenoble - France
Tel +33 4 7642 9550
http://www.aaton.com
http://www.transvideo.eu
French Technologies for Film and Digital Cinematography
Follow us on Twitter
@Aaton_Digital
@Transvideo_HD
Like us on Facebook
https://www.facebook.com/AatonDigital
------------------------------------------------------------------------------
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140
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