User Manual

DOC101699-1- rev 02 -2014-01-17 - Created by:6644
Page 11 of 12
Hatteland Display AS, Åmsosen, N-5578 Nedre Vats, Norway
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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")