Hi. I am new to pyusb and the mailing list.
I am trying to decode the protocol of a USB RVG (x ray camera device) using usbmon [1] (not the stock usbmon of the kernel as it is known to truncate the data in the logs). I am able to play back Ci and Co events using pyusb and have reached where I am not able to play the Ii event shown by usbmon as: 1.007.001 S Ii 0002 With pyusb I am trying to mimic the above as: dev.read(0x81,2) # 0x81 is the only Interrupt IN endpoint On this I get 'Operation timed out'. Even after exposing the camera to the x rays it still gives the same exception. Also tried adding timeout value to as high as 10000ms, but get the same exception. Firstly, is my understanding that 'S Ii 0002' of usbmon maps to dev.read(0x81,2) correct or is there any other way to interact with interrupts? Secondly, what does 'timeout' indicate : not being able to communicate on the end point or the endpoint has no data and hence it doesn't respond back? [1] https://github.com/swetland/usbmon _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
