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Different hid descriptors in one device

 
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KT315



Joined: 27 Oct 2009
Posts: 19

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Different hid descriptors in one device
PostPosted: Wed Oct 28, 2009 7:35 pm     Reply with quote
Hi!
Is there any way to load my device with first hid descriptor if button is pressed (when power switched on) and with second descriptor is button is not pressed?

Smth like
Code:
void main (void)
{
    // init hardware

    if ( button_pressed )
    {
        descriptor = descriptor1;
    }
    else
    {
        descriptor = descriptor2;
    }

    usb_init_cs();

    while (1)
    {
        // do smth
    }
}



Thanks!
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Thu Oct 29, 2009 1:27 am     Reply with quote
Basically yes. You have to modify void usb_copy_desc_seg_to_ep() in usb.c.
KT315



Joined: 27 Oct 2009
Posts: 19

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PostPosted: Thu Oct 29, 2009 2:59 am     Reply with quote
Emm.. Thanks!


And will there be any effect if i just change
Code:
const char USB_CLASS_SPECIFIC_DESC[] ...
const int16 USB_CLASS_SPECIFIC_DESC_LOOKUP[USB_NUM_CONFIGURATIONS][1]
const int16 USB_CLASS_SPECIFIC_DESC_LOOKUP_SIZE[USB_NUM_CONFIGURATIONS][2]

to
Code:
char USB_CLASS_SPECIFIC_DESC[] ...
int16 USB_CLASS_SPECIFIC_DESC_LOOKUP[USB_NUM_CONFIGURATIONS][1]
int16 USB_CLASS_SPECIFIC_DESC_LOOKUP_SIZE[USB_NUM_CONFIGURATIONS][2]


and edit main function like
Code:

const char my_descriptor2[] = { .... };

void main (void)
{
    // init hardware

    if ( button_pressed )
    {
        for( i =0; i< sizeof(my_descriptor2; i++)
        {
            USB_CLASS_SPECIFIC_DESC[i] = my_descriptor2[i];
        }
        // ..
    }

    usb_init_cs();

    while (1)
    {
        // do smth
    }
}
Rohit de Sa



Joined: 09 Nov 2007
Posts: 282
Location: India

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PostPosted: Sun Nov 01, 2009 5:25 am     Reply with quote
I'd like to know how this goes. I'd appreciate it if you could post code when you're done :-) Thanks!

Rohit
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