Appendix, 5 appendix – Hatteland Display 13 inch - HD 13T21 MMC (Widescreen, Inte Cor2 Duo CPU) User Manual
Page 11
DOC101699-1- rev 02 -2014-01-17 - Created by:6644
Page 11 of 12
Hatteland Display AS, Åmsosen, N-5578 Nedre Vats, Norway
Tel: (+47) 4814 2200 - [email protected] - www.hatteland-display.com
DOC101699-1_Touch_Keypad_Access
All intellectual properties belongs to Hatteland Display AS
5 Appendix
The code is to describe the simple procedure of accessing HID device via HIDAPI only. Not
compliable.
void
main
(
void
)
{
//enumurate all the HID devices
struct
hid_device_info
*
devs
,
*
cur_dev
;
devs
=
hid_enumerate
(
0x0
,
0x0
);
cur_dev
=
devs
;
while
(
cur_dev
)
{
//Compare VID and PID
if
(
cur_dev
->
vendor_id
==
TOUCH_VID
&&
cur_dev
->
product_id
==
TOUCH_PID
)
{
if
(
cur_dev
->
path
)
{
//Search "Col03" in current device path,
//if yes, Touch keypad is found.
if
(
strstr
(
cur_dev
->
path
,
"col03"
)!=
NULL
)
break
;
}
}
cur_dev
=
cur_dev
->
next
;
}
if
(
cur_dev
==
NULL
)
{
MessageBox
(
_T
(
"Can't find target HID
device!"
),
NULL
,
MB_ICONWARNING
);
return
;
}
//Free Enumeration
hid_free_enumeration
(
devs
);
//Open HID device
handle
=
hid_open
(
TOUCH_VID
,
TOUCH_PID
,
NULL
);
if
(!
handle
)
{
printf
(
"unable to open device\n"
);
return
1
;
}
// Set the hid_read() function to be non-blocking.
hid_set_nonblocking
(
handle
,
1
);
//Profile button key press
while
(
1
)
{
res
=
hid_read
(
handle
,
buf
,
64
);
if
(
res
>
0
)
{
if
(
buf
[
0
]!=
0x03
)
{
printf
(
"Error in Report ID!\n"
)