 |
OSRegisterTimer |
Function (ROM Call 0xF0) |
Registers a notify (countdown) timer.
TIOS has several notify (countdown) timers. The number of timers is not the same on all AMS versions:
All AMS versions up to 2.03 |
6 timers (1 to 6) |
AMS 2.04 and 2.05 |
7 timers (1 to 7) |
AMS 2.07, 2.08 and 2.09 |
8 timers (1 to 8) |
OSRegisterTimer initializes the timer which ID number is timer_no, and sets its initial
value to T.
Every time the Auto-Int 5 is triggered (approximatively 20 times per second if you didn't change
the programable rate generator), the current value of the timer is decremented by 1. When
the current value reaches zero, nothing special happens, but a flag is set which
indicates that the timer is expired. This flag may be check using function
OSTimerExpired.
OSRegisterTimer returns timer_no if the registration was successful, else
returns zero. This happens if you give wrong parameters, or if the timer timer_no
is already in use. So, you must first free the timer using OSFreeTimer.
Usual use of the timers:
Legal timer numbers (like APD_TIMER) are defined in enum Timers, to make a
program more readable. See also other timer functions for more info.
Used by: cmd_cyclepic, cmd_sendcalc, cmd_sendchat, BatTooLowFlash, LIO_RecvData, GT_Trace, Regraph
See also: FiftyMsecTick, OSFreeTimer, OSTimerCurVal, OSTimerExpired, OSTimerRestart