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timer.c
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C/C++ Source or Header
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1990-01-16
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3KB
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129 lines
/*
* Timer.c: Functions to invoke the Amiga timer
* 05Jul86 - Created by Jeff Lydiatt, Vancouver, Canada.
*
* Amiga Library
*
* $Id: timer.c,v 1.2 90/01/16 10:27:38 crash Exp Locker: crash $
*/
#ifndef lint
static char RCSid[] = "$Id: timer.c,v 1.2 90/01/16 10:27:38 crash Exp Locker: crash $";
#endif /* lint */
#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/lists.h>
#include <exec/ports.h>
#include <exec/tasks.h>
#include <exec/io.h>
#include <devices/timer.h>
#ifdef MCH_AMIGA
# include <functions.h> /* Manx */
#else
# include <proto/exec.h> /* Lattice */
#endif
static struct timerequest TimerIO;
static struct MsgPort *TimerPort = NULL;
static BOOL timerON;
static BOOL timerExpired;
/*--------------------------------------------------------------*/
/* OpenTimer: return TRUE if timer opened OK */
/*--------------------------------------------------------------*/
BOOL OpenTimer()
{
register struct timerequest *t = &TimerIO;
register struct MsgPort *port;
timerON = FALSE;
timerExpired = TRUE;
if (TimerPort != NULL)
return TRUE;
if ((port = CreatePort("Timer Port", 0L)) == NULL)
return FALSE;
else
TimerPort = port;
if (OpenDevice(TIMERNAME, UNIT_VBLANK, t, 0L)) {
DeletePort(port);
TimerPort = NULL;
return FALSE;
}
return TRUE;
}
/*--------------------------------------------------------------*/
/* CloseTimer: All Done with the timer. */
/*--------------------------------------------------------------*/
void CloseTimer()
{
register struct timerequest *t = &TimerIO;
if (timerON) AbortIO(t);
CloseDevice(t);
DeletePort(TimerPort);
TimerPort = NULL;
}
/*--------------------------------------------------------------*/
/* GetTimerSigBit: return Timer signal bit */
/*--------------------------------------------------------------*/
int GetTimerSigBit()
{
return TimerPort->mp_SigBit;
}
/*--------------------------------------------------------------*/
/* StartTimer: launch the timer. */
/*--------------------------------------------------------------*/
void StartTimer(seconds, micros)
ULONG seconds, micros;
{
register struct timerequest *t = &TimerIO;
if (timerON) {
AbortIO(t);
(void) GetMsg(TimerPort);
timerON = FALSE;
timerExpired = TRUE;
}
t->tr_time.tv_secs = seconds;
t->tr_time.tv_micro = micros;
t->tr_node.io_Command = TR_ADDREQUEST;
t->tr_node.io_Flags = IOF_QUICK;
t->tr_node.io_Error = 0;
t->tr_node.io_Message.mn_ReplyPort = TimerPort;
SendIO(t);
timerExpired = FALSE;
timerON = TRUE;
}
/*--------------------------------------------------------------*/
/* TimerExpired: returns TRUE if timer expired. */
/*--------------------------------------------------------------*/
BOOL TimerExpired()
{
if (timerON && (CheckIO(&TimerIO.tr_node) == NULL))
return FALSE;
(void) GetMsg(TimerPort);
timerExpired = TRUE;
timerON = FALSE;
return timerExpired;
}