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2 HIDs in one composite USB code

dhanush nair

I need to write 2HIds in one composite device in STM32 microcontrollers.One for pointer mouse operation and other one for keypad operation.So i wish to know is it possible to do so?If yes will I need to write 2 separate report descriptors.I am using 2 interfaces and 2 ENDPOINTS (enp1 and enp2). Please help...

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  • 0 in reply to Chinzei Tsuneo

    Hi Tsuneo ,

    I tried doing as you said , I wrote report id (1) , then copied Mouse HID and Report id(2) ,then copied keyboard HID and changed descriptor size accordingly . Thats it . However this time my PC is not detecting the new HID, It shows an exclamation mark along side and noew i am stuck .Is there anything else to do . Can you once again explain in detail how to sending both mouse and keyboard data through the same interface and same endpoint . Because I didnt understand the idea.How OS understands that which is report id and which is data.

    The actual mouse data sends 4 bytes ,So now iam sending 5 bytes i.e reportid + 4byte mouse data
    It seems that I am doing something wrong somewhere.. ;)

    Dhanush

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  • 0 in reply to Chinzei Tsuneo

    Hi Tsuneo ,

    I tried doing as you said , I wrote report id (1) , then copied Mouse HID and Report id(2) ,then copied keyboard HID and changed descriptor size accordingly . Thats it . However this time my PC is not detecting the new HID, It shows an exclamation mark along side and noew i am stuck .Is there anything else to do . Can you once again explain in detail how to sending both mouse and keyboard data through the same interface and same endpoint . Because I didnt understand the idea.How OS understands that which is report id and which is data.

    The actual mouse data sends 4 bytes ,So now iam sending 5 bytes i.e reportid + 4byte mouse data
    It seems that I am doing something wrong somewhere.. ;)

    Dhanush

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