Hello,
I have googled this problem and I haven't been able to find any headway.
Any help would be greatly appreciated.
I am modifying the GadgetFS usb.c example code to function as a
simulated USB mouse while running on a PXA255 board (2.4.19-adsx7). I
am monitoring all USB transactions from Windows Host PC to the PXA board
using USB Monitor. I am able to properly initialize the device, config,
interface, hid, and endpoint descriptors. The PXA board is able to
recognize when the host is requesting that it send the HID Report
Descriptor, yet it does not send any of the information. (The setup
packet that is being sent in response to this request is the same as
that of a Logitech mouse, so I know it is receiving the request
correctly.) The segment of code that deals with this is included below.
I'd appreciate any direction anyone could offer regarding this problem
so that I might continue with writing 'mouse movement' to the endpoint!
I have incorporated the following into the usb.c example code:
(the initial description)
static struct hid_descriptor
hid_desc = {
.bLength = 9,
.bDescriptorType = USB_DT_CS_DEVICE,
.bcdHID = 0x0110,
.bCountryCode = 0,
.bNumDescriptors = 1,
hid_desc.desc->bDescriptorType = 0x22;
hid_desc.desc->wDescriptorLength = 0x34;
};
const char ReportDescriptor1[] = {
0x05, 0x01, //Usage Page (Generic Desktop)
0x09, 0x02, //Usage (Mouse)
0xA1, 0x01, //Collection (Application)
0x09, 0x01, //Usage (Pointer)
0xA1, 0x00, //Collection (Physical)
0x05, 0x09, //Usage Page (Buttons)
0x19, 0x01, //Usage Minimum (1)
0x29, 0x03, //Usage Maximum (3)
0x15, 0x00, //Logical Minimum (0)
0x25, 0x01, //Logical Maximum (1)
0x95, 0x03, //Report Count (3)
0x75, 0x01, //Report Size (1)
0x81, 0x02, //Input (Data, Variable, Absolute)
0x95, 0x01, //Report Count (1)
0x75, 0x05, //Report Size (5)
0x81, 0x01, //Input (Constant)
0x05, 0x01, //Usage Page (Generic Desktop)
0x09, 0x30, //Usage (X)
0x09, 0x31, //Usage (Y)
0x15, 0x81, //Logical Minimum (-127)
0x25, 0x7F, //Logical Maximum (127)
0x75, 0x08, //Report Size (8)
0x95, 0x02, //Report Count (2)
0x81, 0x06, //Input (Data, Variable, Relative)
0xC0, //End Collection
0xC0 // End Collection
};
const unsigned int ReportDescSize = sizeof(ReportDescriptor1);
(in the handle_control function):
case USB_REQ_GET_REPORT:
switch (setup->wValue >> 8) {
case USB_DT_REPORT:
for(i=0; i<=ReportDescSize; i++)
{
buf[i] = ReportDescriptor1[i];
}
status = write(fd, buf, setup->wLength);
if (status<0)
{
if (errno == EIDRM)
fprintf (stderr, "GET_REPORT
timeout\n");
else
perror ("write GET_REPORT data");
}
else if (status != tmp)
{
fprintf (stderr, "short GET_REPORT write,
%d\n", status);
}
break;
}
return;
Thank you,
Colleen
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