Ports and Interfaces > USB

pipe set up

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ulao:
I set up my pipes long ago. I really do not understand this anymore but know a lot more about sending and reading data. So I know I need:
 to poll interrupt data from the device
 Allow control transfers feature set/get 's
 Allow FFB ( it uses control outs/ins )

So why do I need the second pipe? It looks like all my data uses the 0 pipe.





    7,          /* sizeof(usbDescrEndpoint) */
    USBDESCR_ENDPOINT,  /* descriptor type = endpoint */
    0x81,       // bulk IN endpoint number 1
    0x03,       // attrib: Interrupt endpoint :1async 2:bulk 3:int 0:control
    8, 0,       /* maximum packet size */
    0x08, /* in ms*/

//the output. ( i'd like to know what this really is? like for FFB outs, if so why ints?

    7,          // sizeof(usbDescrEndpoint)
    USBDESCR_ENDPOINT,  // descriptor type = endpoint
    0x02,        // out endpoint
    0x03,       // attrib: Interrupt endpoint :1async 2:bulk 3:int 0:control
    8, 0,       // maximum packet size
    0x08, // in ms

Jan Axelson:
If a HID has an interrupt OUT endpoint, the Windows HID driver will use it to send Output reports. Otherwise it will use control transfers.

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