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Check that timers don't get 0 microseconds intervals

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1847
This commit is contained in:
Sjoerd van der Berg 2004-06-20 17:01:58 +00:00
parent 55cf4510c9
commit 13d4604573
1 changed files with 3 additions and 6 deletions
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9
src/hardware/timer.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: timer.cpp,v 1.24 2004-06-17 07:27:55 harekiet Exp $ */
/* $Id: timer.cpp,v 1.25 2004-06-20 17:01:58 harekiet Exp $ */
#include "dosbox.h"
#include "inout.h"
@ -36,8 +36,6 @@ static INLINE void BCD2BIN(Bit16u& val) {
Bit16u temp= (val&0x0f) +((val>>4)&0x0f) *10 +((val>>8)&0x0f) *100 +((val>>12)&0x0f) *1000;
val=temp;
}
struct PIT_Block {
Bit8u mode; /* Current Counter Mode */
@ -131,6 +129,7 @@ static void write_latch(Bitu port,Bitu val,Bitu iolen) {
} else p->cntr = p->write_latch;
p->start=PIC_MicroCount();
p->micro=(Bits)(1000000/((float)PIT_TICK_RATE/(float)p->cntr));
if (!p->micro) p->micro=1;
switch (counter) {
case 0x00: /* Timer hooked to IRQ 0 */
PIC_RemoveEvents(PIT0_Event);
@ -180,8 +179,7 @@ static Bitu read_latch(Bitu port,Bitu iolen) {
break;
}
if( pit[counter].bcd == true) BCD2BIN(pit[counter].read_latch);
return ret;
return ret;
}
static void write_p43(Bitu port,Bitu val,Bitu iolen) {
@ -255,7 +253,6 @@ void TIMER_Init(Section* sect) {
pit[1].micro=(Bits)(1000000/((float)PIT_TICK_RATE/(float)pit[1].cntr));
pit[2].micro=(Bits)(1000000/((float)PIT_TICK_RATE/(float)pit[2].cntr));
PIC_AddEvent(PIT0_Event,pit[0].micro);
}