Objective Development Forums 2008-03-05T01:24:56+02:00 https://forums.obdev.at/app.php/feed/topic/1257 2008-03-05T01:24:56+02:00 2008-03-05T01:24:56+02:00 https://forums.obdev.at/viewtopic.php?t=1257&p=4468#p4468 <![CDATA[USB HID with different Report ID's]]> Statistics: Posted by Guest — Wed Mar 05, 2008 1:24 am

]]> 2008-03-02T23:22:09+02:00 2008-03-02T23:22:09+02:00 https://forums.obdev.at/viewtopic.php?t=1257&p=4446#p4446 <![CDATA[USB HID with different Report ID's]]>
Setup: Mega8 Low Speed



i'm currently building an USB IO device and have a question.
Here ist my HID Descriptor

Code: 

  

    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
    0x09, 0x00,                    // USAGE (Undefined)
    0x15, 0x00,                    // LOGICAL_MINIMUM (0)
    0x26, 0xff, 0x00,              // LOGICAL_MAXIMUM (255)
    0xa1, 0x01,                    // COLLECTION (Application)
    0xa1, 0x02,                    //    COLLECTION (Logical)
    0x85, 0x01,                    //      REPORT_ID (1)
    0x75, 0x08,                    //      REPORT_SIZE (8)
    0x95, 0x01,                    //      REPORT_COUNT (1)
    0x09, 0x00,                    //      USAGE (Undefined)
    0x81, 0x02,                    //      INPUT (Data,Var,Abs)
    0xc0,                           //    END_COLLECTION
    0xa1, 0x02,                    //    COLLECTION (Logical)
    0x85, 0x02,                    //      REPORT_ID (2)
    0x75, 0x08,                    //      REPORT_SIZE (8)
    0x95, 0x27,                    //      REPORT_COUNT (39)
    0x19, 0x00,                    //      USAGE_MIN (Undefined)
    0x29, 0x00,                    //      USAGE_MAX (Undefined)
    0x81, 0x02,                    //      INPUT (Data,Var,Abs)
    0x19, 0x00,                    //      USAGE_MIN (Undefined)
    0x29, 0x00,                    //      USAGE_MAX (Undefined)
    0x91, 0x02,                    //      OUTPUT (Data,Var,Abs)
    0xc0,                          //    END_COLLECTION
    0xc0                           // END_COLLECTION


I got this working with control transfer, because I can send my Report ID. My transfer rate is about 5kb/sek.

I try to implement an interrupt In too, that I don't have to poll the 40 Bytes again and again.
The problem is, that I want to let the computer poll only the report with ID 1, so that i must only send 1 Byte.
I checked it with an USB Analyser software, but it doesn't work. The computer send "get 40 bytes" and my controller answers with 2 bytes. (Report ID + data).
How can I tell the computer to poll the 2 Bytes for Report 1?

When I read and write over GetReport and SetReport it works, but not with Readfile.

Statistics: Posted by Guest — Sun Mar 02, 2008 11:22 pm

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