2011/10/4 Andhika Pratama <andhika.pratama....@gmail.com>
> Dear all,
>
> Im new with pyusb, I just bought a device and this device have a
> pressure/push and twist sensors. As my starting point to learn is I want to
> read the sensors value from my device and display it in my PyQT application.
>
> First thing first, I use the libusb-win32 to install the driver and get the
> information about my device, see bellow picture:
>
> [image: http://img830.imageshack.us/img830/9748/usbs.jpg]
>
> That is my device information, I got my VendorID, ProductID and the
> interface number and address of device Endpoint. with this code I can detect
> that my device is already present on my system bus:
> import usb.core
> import usb.util
> import sys
>
> # find our device
> dev = usb.core.find(idVendor=0x1D34, idProduct=0x0020)
>
> # 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()
> print "Device found!"
>
>
> I've got everything right at this point. then next step is I want to
> send/receive some data packet to/from my device (to read the two sensors;
> pressure/push and twist sensor).
> I've got the manual from my vendor for reading and writing into the device,
> here it is:
>
> [image: http://img12.imageshack.us/img12/9519/protocoly.jpg]
>
> I tried to read the sensor value from the device by writing data to the
> device first in order to enable the senseors and then reading the value
> itself afterward (according the manual):
>
> import usb.core
> import usb.util
> import sys
>
> # find our device
> dev = usb.core.find(idVendor=0x1D34, idProduct=0x0020)
>
> # 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(0x01,'\0x08,\0x0,\0x0,\0x0,\0x0,\0x0,\0x0,\0x0F',0)
> dev.write(0x01,'\0x09,\0x0,\0x0,\0x0,\0x0,\0x0,\0x0,\0x0',0)
>
> test = dev.read(0x81,8,0,1000)
> sret = ''.join([chr(x) for x in test])
> print "data: ", sret
>
> *But I got the following error:*
>
> G:\matix\Stress Ball\Project\Code\src>detectdev.py
> Traceback (most recent call last):
> File "G:\D. Hartanto\Stress Ball\Project\Code\src\detectdev.py", line 24,
> in <module>
> dev.write(0x01,'\0x08,\0x0,\0x0,\0x0,\0x0,\0x0,\0x0,\0x0F',0)
> File "C:\Python26\lib\site-packages\usb\core.py", line 594, in write
> fn = fn_map[self._ctx.get_endpoint_type(self, endpoint, intf)]
> File "C:\Python26\lib\site-packages\usb\core.py", line 180, in
> get_endpoint_type
> etype = util.endpoint_type(e.bmAttributes)
> AttributeError: 'NoneType' object has no attribute 'bmAttributes'
>
> Trying looking around into the net to solve the problem but still got no
> luck, did I missed something here? I really want to have connection with my
> device, so I can read those sensors value into my PC.
> Thank you very much guys,
>
You probably are writing to a non-existence endpoint. Please, check that
>
> Regards,
> Pratams.
>
>
>
>
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>
--
Best Regards,
Wander Lairson Costa
https://github.com/walac
https://gitorious.org/~walac
------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2dcopy1
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