Objective Development Forums

hi,
sorry for bad English,
i've run HID mouse successfully and i understand the structure that is used for sending data.(that consist 1 uchar for buttons and 3 char for dx , dy and wheel)
i'm trying to run an HID multitouch and i don't know how many variable i have to use in report structure.
Can somebody write the structure?
HID multitouch have a descriptor like this:(according to a document by microsoft)

0x05, 0x0d, // USAGE_PAGE (Digitizers)
0x09, 0x04, // USAGE (Touch Screen)
0xa1, 0x01, // COLLECTION (Application)
0x85, REPORTID_MTOUCH, // REPORT_ID (Touch)
0x09, 0x22, // USAGE (Finger)
0xa1, 0x02, // COLLECTION (Logical)
0x09, 0x42, // USAGE (Tip Switch)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x32, // USAGE (In Range)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x47, // USAGE (Touch Valid)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x05, // REPORT_COUNT (5)
0x81, 0x03, // INPUT (Cnst,Ary,Abs)
0x75, 0x08, // REPORT_SIZE (
0x09, 0x51, // USAGE (Contact Identifier)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x05, 0x01, // USAGE_PAGE (Generic Desk..
0x26, 0xff, 0x7f, // LOGICAL_MAXIMUM (32767)
0x75, 0x10, // REPORT_SIZE (16)
0x55, 0x00, // UNIT_EXPONENT (0)
0x65, 0x00, // UNIT (None)
0x09, 0x30, // USAGE (X)
0x35, 0x00, // PHYSICAL_MINIMUM (0)
0x46, 0x00, 0x00, // PHYSICAL_MAXIMUM (0)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x31, // USAGE (Y)
0x46, 0x00, 0x00, // PHYSICAL_MAXIMUM (0)
0x81, 0x02, // INPUT (Data,Var,Abs)
0xc0, // END_COLLECTION
0xa1, 0x02, // COLLECTION (Logical)
0x05, 0x0d, // USAGE_PAGE (Digitizers)
0x09, 0x42, // USAGE (Tip Switch)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x32, // USAGE (In Range)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x47, // USAGE (Touch Valid)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x05, // REPORT_COUNT (5)
0x81, 0x03, // INPUT (Cnst,Ary,Abs)
0x75, 0x08, // REPORT_SIZE (
0x09, 0x51, // USAGE ( Cotact Identifier)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x05, 0x01, // USAGE_PAGE (Generic Desk..
0x26, 0xff, 0x7f, // LOGICAL_MAXIMUM (32767)
0x75, 0x10, // REPORT_SIZE (16)
0x55, 0x00, // UNIT_EXPONENT (0)
0x65, 0x00, // UNIT (None)
0x09, 0x30, // USAGE (X)
0x35, 0x00, // PHYSICAL_MINIMUM (0)
0x46, 0x00, 0x00, // PHYSICAL_MAXIMUM (0)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x31, // USAGE (Y)
0x46, 0x00, 0x00, // PHYSICAL_MAXIMUM (0)
0x81, 0x02, // INPUT (Data,Var,Abs)
0xc0, // END_COLLECTION
0x05, 0x0d, // USAGE_PAGE (Digitizers)
0x09, 0x54, // USAGE (Contact Count)
0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x08, // REPORT_SIZE (
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x08, // LOGICAL_MAXIMUM (
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x55, // USAGE(Contact Count Maximum)
0xb1, 0x02, // FEATURE (Data,Var,Abs)
0xc0, // END_COLLECTION

Get your self the HID Descriptor Tool...
http://www.usb.org/developers/hidpage#HID Descriptor Tool

thanks fro reply, my problem is about the structure that is used to send data to computer.
for example for an hid mouse we use sth like this:
typedef struct{
uchar buttonMask;
char dx;
char dy;
char dWheel;
}report_t;

1 variable for buttons and 3 variables for dx,dy and wheel.

and my question is what is the relation between report descriptor and report structure?
(i think we need a variable in structure for every "INPUT (Data,Var,...)" in descriptor.)
and what will be the structure for digitizer?

I see, well its document out there in the waste lands... but the way I always did that was to send a unique report and then see what it effects. Obviously it have nothing to do with your struct but more so the data packet. For example here is a basic gamepad

reportBuffer[1]=128;//X-Axis ( main stick )
reportBuffer[2]=128;//Y-Axis
reportBuffer[3]=128;//Z-Axis
reportBuffer[4]=128;//X-rotate
reportBuffer[5]=128;//Y-rotate
reportBuffer[6]=128;//Z-rotate
reportBuffer[7]=128;//slider( right trig )
reportBuffer[8]=128;//dial ( left trig )
reportBuffer[9] =0;//buttons 1
reportBuffer[10]=0;//buttons 2
reportBuffer[11]=0;//buttons 3


Now to figure out what byte 6 was I'd do this reportBuffer[6]=0xff; then I watch my hid device on the PC end and look for ff. Then I can see that report 6 goes to Z-rotate.That the easy way IMO. The hard way is to look up the HID digitize on Microsoft knowledge base.

I dont have any experience with digitizes but maybe this helps?
http://sourceforge.net/apps/mediawiki/l ... B_Protocol