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TimerDevice.c
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C/C++ Source or Header
|
1989-06-19
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2KB
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88 lines
/* TimerDevice.c ************************************************************
*
* TimerDevice --- Some useful timer.device control routines.
*
* Author -------- Olaf Barthel, ED Electronic Design Hannover
* Brabeckstrasse 35
* D-3000 Hannover 71
*
* Federal Republic of Germany
*
****************************************************************************/
#include <exec/types.h>
#include <devices/timer.h>
#include <exec/memory.h>
/* Structures we need, these don't need to be visible to
* other modules.
*/
struct timerequest *tr_TimerRequest= NULL,*AllocMem();
struct MsgPort *tr_TimerPort = NULL,*CreatePort();
/* CloseTimerDevice() :
*
* Deallocate the control structures.
*/
void
CloseTimerDevice()
{
if(tr_TimerRequest)
{
CloseDevice(tr_TimerRequest);
FreeMem(tr_TimerRequest,sizeof(struct timerequest));
}
if(tr_TimerPort)
DeletePort(tr_TimerPort);
}
/* OpenTimerDevice() :
*
* Initialize the precision timer.
*/
BOOL
OpenTimerDevice()
{
if(!(tr_TimerPort = (struct MsgPort *)CreatePort(NULL,0)))
return(FALSE);
if(!(tr_TimerRequest = (struct timerequest *)AllocMem(sizeof(struct timerequest),MEMF_PUBLIC | MEMF_CLEAR)))
{
DeletePort(tr_TimerPort);
return(FALSE);
}
if(OpenDevice(TIMERNAME,UNIT_VBLANK,tr_TimerRequest,0))
{
FreeMem(tr_TimerRequest,sizeof(struct timerequest));
DeletePort(tr_TimerPort);
return(FALSE);
}
tr_TimerRequest -> tr_node . io_Message . mn_ReplyPort = tr_TimerPort;
tr_TimerRequest -> tr_node . io_Command = TR_ADDREQUEST;
tr_TimerRequest -> tr_node . io_Flags = 0;
tr_TimerRequest -> tr_node . io_Error = 0;
return(TRUE);
}
/* WaitTime(Seconds,Micros) :
*
* Wait a period of time.
*/
void
WaitTime(Seconds,Micros)
register ULONG Seconds,Micros;
{
tr_TimerRequest -> tr_time . tv_secs = Seconds;
tr_TimerRequest -> tr_time . tv_micro = Micros;
DoIO(tr_TimerRequest);
}