Hi Wander,
As you can see from my screen capture above that my device endpoint address
is 0x81, and I check couple of example also had the same address, that is
0x81. and my device only have one endpoint.
I'm curious, is the way I communicate (my code) with the device is correct?
just beginner but willing to learn.
Thanks,
Pratams.
On Wed, Oct 5, 2011 at 12:36 PM, Wander Lairson Costa <
wander.lair...@gmail.com> wrote:
>
>
> 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.
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> 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
>> _______________________________________________
>> pyusb-users mailing list
>> pyusb-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>>
>>
>
>
> --
> 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
> _______________________________________________
> pyusb-users mailing list
> pyusb-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
------------------------------------------------------------------------------
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
_______________________________________________
pyusb-users mailing list
pyusb-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/pyusb-users
