Posted on December 05, 2012 at 10:43
Hi,
I do use the ST Evalboard STM3220G-Eval and started with ST example project USB HID Device Mouse/Joystick. It does work on Windows and Linux - no problems.
Now I started to modify the example because my device should not appear as a mouse. I want to send 4 bytes of data from the usb device (Evalboard) to the usb host (computer).
In file usbd_hid_core.c I did two changes:
InterfaceProtocal was 2 and is now 0
0x00,
/*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse*/
And the report descriptor looks like this
// HID_MOUSE_REPORT_DESC_SIZE = 21
0x06, 0x00, 0xff,
// USAGE_PAGE (Vendor Defined Page 1)
0x09, 0x01,
// USAGE (Vendor Usage 1)
0xa1, 0x01,
// COLLECTION (Application)
0x15, 0x00,
// LOGICAL_MINIMUM (0)
0x26, 0xff, 0x00,
// LOGICAL_MAXIMUM (255)
0x75, 0x08,
// REPORT_SIZE (8)
0x95, 0x04,
// REPORT_COUNT (4)
0x09, 0x01,
// USAGE (Vendor Usage 1)
0x81, 0x02,
// INPUT (Data,Var,Abs)
0xc0
// END_COLLECTION
In windows it does work and send 4 bytes of data. But with Linux I get an error during initialization:
URB status: Broken pipe (-EPIPE) (-32)
Does anyone know that problem?
