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USB HID with more then 2 bytes

 
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Prefekt



Joined: 21 Oct 2010
Posts: 85

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USB HID with more then 2 bytes
PostPosted: Wed Aug 28, 2013 11:28 am     Reply with quote
Hello,

I have tried the ex_usb_hid example. I need to transmit more then 2 bytes in both directions.
But I don't know what I must change.
In the documentation is written to change the package size, but how?

thanks
Volker
Prefekt



Joined: 21 Oct 2010
Posts: 85

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PostPosted: Wed Aug 28, 2013 1:02 pm     Reply with quote
I have change this value to transmit 3 bytes...

in usb_cdc_hid.h:

Code:

0x75, 8,        // Report size = 8 (bits)
0x95, 3,        // Report count = 16 bits (2 bytes)
0x81, 3,        // Input (Data, Var, Abs)
0x19, 1,        // Usage minimum
0x29, 8,        // Usage maximum
0x75, 8,        // Report size = 8 (bits)
0x95, 3,        // Report count = 16 bits (2 bytes)
0x91, 3,        // Output (Data, Var, Abs)
0xc0            // End Collection


and in the sample:
Code:

usb_put_packet(1, out_data, 3, USB_DTS_TOGGLE)
...
usb_get_packet(1, in_data, 3);


it works... are these all places?
Ttelmah



Joined: 11 Mar 2010
Posts: 19520

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PostPosted: Thu Aug 29, 2013 11:25 am     Reply with quote
Don't change the file.

Just set the two defines:

USB_CONFIG_HID_TX_SIZE

and

USB_CONFIG_HID_RX_SIZE

_Before_ you load the HID descriptor.

Maximum value you can set is 64.

These change everything needed for you. Smile

If undefined, they default to two (the size wanted by the demo). Otherwise your values override the settings.

Best Wishes
Prefekt



Joined: 21 Oct 2010
Posts: 85

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PostPosted: Sat Aug 31, 2013 5:34 am     Reply with quote
Hello,

thank for the information. I thought about this, but I was not shure.


Thanks
Volker
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