ICP DAS USA I-7188XA, User Manual

Page: 70 / 166

I-7188XA Series User’s Manual ( Ver1.2, Feb/2014, 7MH-019-10 ) ---
70
4.10 Using the Timer Function
The I-7188XA(D) can support one main time tick, 8 StopWatch timers
and 8 CountDown timers. The I-7188XA(D) uses a single 16-bit timer to
perform these timer functions, with a timer accuracy of 1 ms. The
InstallUserTimer() function can be used to install a custom timer
function and the function will be called at 1 ms intervals. The system
timer of the MiniOS7 will call INT 9 every 1 ms and call INT 0x1C every
55 ms. The timer function of the library is linked to associated with
called by hooked to INT 9 and will call any custom timer function.
The
TimerOpen() function is used to start the I-7188XA(D) timer, and
this function must be inserted at the beginning of the program. The
TimerClose() function is used to stop the timer. The sample code is as
follows:
Refer to the demo programs in the
CD:\Napdos\7188XABC\7188XA\Demo\BC_TC\Timer folder for more
information.
unsigned long time iTime;
InitLib(); /* Initiate the 7188xa library */
TimerOpen();
/* Begin using the 7188XA timer function */
while(!quit)
{
if(Kbhit())
TimerResetValue(); /* Reset the main time ticks to 0 */
iTime=TimerReadValue(); /* Read main time ticks */
}
TimerClose(); /* Stop using the 7188XA timer function */