Hey Santiago,
I've tried sending control messages but either the devices does not use it
or I cannot construct them correctly, for example, here I've tried to send a
GET_REPORT (the one that keyboard and mises use to communicate according to
HID especification) message:
# 0x91 and 0x01 for a GET_REPORT control message
dev.ctrl_transfer(0x91, 0x01,0,0,data)
also tried with other control messages, but everything return a pipe error
like before.
I found an implementation of a credit card reader in python 1.0 here
http://www.micahcarrick.com/credit-card-reader-pyusb.html it seems pritty
simple. I don't know why I cannot make it work :(.
Although with the instruction:
dev.write(1,data)
the devices seems to be processing the information, I just cannot harvest
the response for some reason.
right now I got stuck sending data to the device but with response full of
zeros, as it is shown in the link below:
https://docs.google.com/Doc?id=dfpfb3rg_126jsh78vfv&authkey=CIPQmpoB
here is the output of the lsusb -vv command:
https://docs.google.com/Doc?id=dfpfb3rg_127fpxrqghc&authkey=CICHl_QP
Thanks for keep throwing ideas !
Marcos
On Tue, Dec 14, 2010 at 6:37 PM, Santiago Palomino Sanchez-Manjavacas <
sps...@gmail.com> wrote:
> It was a long time since I worked with the usb, but I recall the endpoints
> are unidirectional. I think trying to read from an output shall return some
> kind of error. You can try to find out which of the two operations (r/w) is
> working first. You can try to find out if the device accepts the writes by
> sending commands whose consequences can be observed by looking at the usb
> device.
>
> I also remember having to deal with the control endpoints before using the
> regular endpoints. That was done in the following way when I used a device
> running the porus stack:
>
> porusBLKI(self.devh,bc)
> print "Waiting for BITX (or IDLE).."
> while porusSTAT(self.devh)==3: pass
> print "Got BITX, now receiving .."
> rndbuf=self.rxChain(1) *<=== This is just doing a read, but I sent
> a control message to the device first.*
>
>
> def porusBLKO(devh,length):
> devh.controlMsg(0x41,4,[],length)
>
> def porusBLKI(devh,length):
> devh.controlMsg(0x41,3,[],length)
>
> def porusTMOI(devh,length,c):
> devh.controlMsg(0x41,7,[c],length)
>
>
> def porusSTAT(devh):
> buf=devh.controlMsg(0xC1, 5, 1)[0]
> if buf<0: buf+=256
> return buf
>
> I do not know if all devices require control messages before accessing the
> endpoints, but that device did.
>
> Good luck with it.
>
>
>
> On Tue, Dec 14, 2010 at 20:31, Marcos Wolff <wmar...@gmail.com> wrote:
>
>> update:
>>
>> If I use the same endpoint for reading and writing it works but returns
>> just 0s :(
>>
>> #prueba.py
>> import usb.core
>> dev = usb.core.find(idVendor=1240,idProduct=32)
>> if dev is None:
>> raise ValueError('Device not found')
>> interface = dev.get_interface_altsetting()
>> if dev.is_kernel_driver_active(interface.bInterfaceNumber) is True:
>> dev.detach_kernel_driver(interface.bInterfaceNumber)
>> dev.set_configuration()
>> msg = '\x02\x03\x00'
>> dev.write(1, msg, 0)
>> ret = dev.read(1, len(msg), 0)
>> print ret
>>
>>
>> msg: [1, 3, 0]
>> ret: array('B', [0, 0, 0, 0, 0])
>>
>>
>>
>> On Tue, Dec 14, 2010 at 4:06 PM, Marcos Wolff <wmar...@gmail.com> wrote:
>>
>>> Hi again,
>>>
>>> Did a little more research. I found out the console command lsusb -vv to
>>> analyze the device, runned it, got this:
>>>
>>> Bus 002 Device 030: ID 04d8:0020 Microchip Technology, Inc.
>>> Device Descriptor:
>>> bLength 18
>>> bDescriptorType 1
>>> bcdUSB 1.10
>>> bDeviceClass 0 (Defined at Interface level)
>>> bDeviceSubClass 0
>>> bDeviceProtocol 0
>>> bMaxPacketSize0 64
>>> idVendor 0x04d8 Microchip Technology, Inc.
>>> idProduct 0x0020
>>> bcdDevice 1.00
>>> iManufacturer 1 DZE
>>> iProduct 2 CDI TEST v1.0
>>> iSerial 0
>>> bNumConfigurations 1
>>> Configuration Descriptor:
>>> bLength 9
>>> bDescriptorType 2
>>> wTotalLength 41
>>> bNumInterfaces 1
>>> bConfigurationValue 1
>>> iConfiguration 0
>>> bmAttributes 0xc0
>>> Self Powered
>>> MaxPower 100mA
>>> Interface Descriptor:
>>> bLength 9
>>> bDescriptorType 4
>>> bInterfaceNumber 0
>>> bAlternateSetting 0
>>> bNumEndpoints 2
>>> bInterfaceClass 3 Human Interface Device
>>> bInterfaceSubClass 0 No Subclass
>>> bInterfaceProtocol 0 None
>>> iInterface 0
>>> HID Device Descriptor:
>>> bLength 9
>>> bDescriptorType 33
>>> bcdHID 1.00
>>> bCountryCode 0 Not supported
>>> bNumDescriptors 1
>>> bDescriptorType 34 Report
>>> wDescriptorLength 32
>>> Report Descriptors:
>>> ** UNAVAILABLE **
>>> Endpoint Descriptor:
>>> bLength 7
>>> bDescriptorType 5
>>> * bEndpointAddress 0x81 EP 1 IN*
>>> bmAttributes 3
>>> Transfer Type Interrupt
>>> Synch Type None
>>> Usage Type Data
>>> wMaxPacketSize 0x0008 1x 8 bytes
>>> bInterval 1
>>> Endpoint Descriptor:
>>> bLength 7
>>> bDescriptorType 5
>>> * bEndpointAddress 0x01 EP 1 OUT*
>>> bmAttributes 3
>>> Transfer Type Interrupt
>>> Synch Type None
>>> Usage Type Data
>>> wMaxPacketSize 0x0008 1x 8 bytes
>>> bInterval 10
>>> Device Status: 0x0001
>>> Self Powered
>>>
>>> -----------------------------
>>>
>>> so I modified the script to use those endpoints:
>>>
>>> #prueba.py
>>>
>>> import usb.core
>>>
>>> dev = usb.core.find(idVendor=1240,idProduct=32)
>>> if dev is None:
>>> raise ValueError('Device not found')
>>>
>>> interface = dev.get_interface_altsetting()
>>> if dev.is_kernel_driver_active(interface.bInterfaceNumber) is True:
>>> dev.detach_kernel_driver(interface.bInterfaceNumber)
>>>
>>> dev.set_configuration()
>>>
>>> msg = '\x02\x03\x00'
>>> dev.write(1, msg, 0)
>>> ret = dev.read(0x81, len(msg), 0)
>>> print ret
>>>
>>> Now the device start blinking its leds like it's working but I get:
>>>
>>> Traceback (most recent call last):
>>> File "prueba.py", line 27, in <module>
>>> ret = dev.read(0x81, len(msg), 0)
>>> File "/home/administrador/pyusb-1.0.0-a0/usb/core.py", line 624, in
>>> read
>>> self.__get_timeout(timeout)
>>> File "/home/administrador/pyusb-1.0.0-a0/usb/_debug.py", line 53, in
>>> do_trace
>>> return f(*args, **named_args)
>>> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py", line
>>> 501, in intr_read
>>> timeout)
>>> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py", line
>>> 581, in __read
>>> timeout))
>>> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py", line
>>> 353, in _check
>>> raise USBError(_str_error[retval.value])
>>> *usb.core.USBError: Operation timed out*
>>>
>>> Tried changing the timeout value and didn't work :(.
>>>
>>> Any ideas ?
>>>
>>> Thanks !
>>>
>>> On Tue, Dec 14, 2010 at 3:32 PM, Marcos Wolff <wmar...@gmail.com> wrote:
>>>
>>>> Follow-up: Santiago:
>>>>
>>>> Also found the method doesn't exists in pyusb 1.0 apparently it manages
>>>> interface claiming automatically.
>>>>
>>>> source:
>>>> http://www.mail-archive.com/pyusb-users@lists.sourceforge.net/msg00374.html
>>>>
>>>> On Tue, Dec 14, 2010 at 3:30 PM, Marcos Wolff <wmar...@gmail.com>wrote:
>>>>
>>>>> Hi Santiago,
>>>>>
>>>>> Following this tutorial it doesn't seem to be needed:
>>>>>
>>>>> http://pyusb.sourceforge.net/docs/1.0/tutorial.htm#talk-to-me-honey
>>>>>
>>>>> Anyway I've tried (kind of desperate here) and didn't work :(
>>>>>
>>>>> thank for the quick answer !
>>>>>
>>>>>
>>>>> On Tue, Dec 14, 2010 at 3:18 PM, Santiago Palomino Sanchez-Manjavacas
>>>>> <sps...@gmail.com> wrote:
>>>>>
>>>>>> missing claimInterface() before using the control endpoint?
>>>>>>
>>>>>> Just a guess
>>>>>>
>>>>>> On Tue, Dec 14, 2010 at 18:54, Marcos Wolff <wmar...@gmail.com>wrote:
>>>>>>
>>>>>>> Hi everyone,
>>>>>>>
>>>>>>> I'm having trouble comunicating with a custom made (from a PIC
>>>>>>> 18f4550 micro-controller) HID device. Nowadays is used with windows and
>>>>>>> the
>>>>>>> default HID driver in vb6 but I would like to port it to linux (ubuntu
>>>>>>> 10.10) and pyusb (1.0a).
>>>>>>>
>>>>>>> The device is simple, when it receives 3 bytes via HID it responses 3
>>>>>>> bytes back with data. The people who made it told me that everything is
>>>>>>> handled via end point 0 and default config).
>>>>>>>
>>>>>>> As I want to port it to linux I read this tutorial
>>>>>>> http://pyusb.sourceforge.net/docs/1.0/tutorial.html and tried to
>>>>>>> communicate via default config endpoint configuration:
>>>>>>>
>>>>>>> #prueba.py
>>>>>>>
>>>>>>> import usb.core
>>>>>>>
>>>>>>> #busco dispositivo
>>>>>>> dev = usb.core.find(idVendor=1240,idProduct=32)
>>>>>>> if dev is None:
>>>>>>> raise ValueError('Device not found')
>>>>>>>
>>>>>>> interface = dev.get_interface_altsetting()
>>>>>>> if dev.is_kernel_driver_active(interface.bInterfaceNumber) is True:
>>>>>>> dev.detach_kernel_driver(interface.bInterfaceNumber)
>>>>>>>
>>>>>>>
>>>>>>> dev.set_configuration()
>>>>>>>
>>>>>>> #mensaje de 3 bytes
>>>>>>> msg = '\x02\x03\x00'
>>>>>>>
>>>>>>> #bmRequestType y bRequest as said in
>>>>>>> http://www.jungo.com/st/support/documentation/windriver/811/wdusb_man_mhtml/node55.html#usb_standard_dev_req_codes
>>>>>>>
>>>>>>>
>>>>>>> dev.ctrl_transfer(0x40, 0x02, 0, 0, msg)
>>>>>>>
>>>>>>>
>>>>>>> and I get this error which I don't fully understand:
>>>>>>>
>>>>>>> Traceback (most recent call last):
>>>>>>> File "ejemplo.py", line 39, in <module>
>>>>>>> print dev.ctrl_transfer(0x40, 0x02, 0, 0, msg)
>>>>>>> File "/home/administrador/pyusb-1.0.0-a0/usb/core.py", line 668, in
>>>>>>> ctrl_transfer
>>>>>>> self.__get_timeout(timeout)
>>>>>>> File "/home/administrador/pyusb-1.0.0-a0/usb/_debug.py", line 53,
>>>>>>> in do_trace
>>>>>>> return f(*args, **named_args)
>>>>>>> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py",
>>>>>>> line 538, in ctrl_transfer
>>>>>>> timeout))
>>>>>>> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py",
>>>>>>> line 353, in _check
>>>>>>> raise USBError(_str_error[retval.value])
>>>>>>> *usb.core.USBError: Pipe error*
>>>>>>>
>>>>>>> Could someone guide me ? help me see what I'm doing wrong ?
>>>>>>>
>>>>>>> Thanks in advance !
>>>>>>> Marcos.
>>>>>>>
>>>>>>>
>>>>>>> PD: I tried to sniff usb ports with this tutorial
>>>>>>> http://biot.com/blog/usb-sniffing-on-linux but nothing seems to be
>>>>>>> happening excepto when I reset the device.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------------------------------------------------------
>>>>>>> Lotusphere 2011
>>>>>>> Register now for Lotusphere 2011 and learn how
>>>>>>> to connect the dots, take your collaborative environment
>>>>>>> to the next level, and enter the era of Social Business.
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>>>>>>> _______________________________________________
>>>>>>> pyusb-users mailing list
>>>>>>> pyusb-users@lists.sourceforge.net
>>>>>>> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
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>>>>>> to connect the dots, take your collaborative environment
>>>>>> to the next level, and enter the era of Social Business.
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>>>>>> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>>
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>>
>
>
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