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stf92 01-09-2014 02:40 AM
The inner workings of USB.
 
Hi: I have a program which runs in a microcontroller which communicates with a PC compatible desktop computer via USB. I would like to know which of the data flow types it uses: bulk, interrupt or isochronous. Of course I have the sources. How could I do in order to know? If you need further information I'm ready to give it to you. NOTE: I forgot. Everything is implemented in software. The micro has no USB support builtin.

stf92 01-10-2014 07:38 AM
It was very easy, after all. I plugged the device into one of the machine's USB jacks and ran 'lsusb -v'.
Code:
    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              4
The answer is given under 'Transfer type'.


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