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GB Timer: Fix sub-M-cycle DIV reset timing and edge triggering

This commit is contained in:
Vicki Pfau 2017-06-22 01:20:22 -07:00
parent 715409f5ca
commit 3a03d180d2
2 changed files with 9 additions and 1 deletions
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1
CHANGES
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@ -72,6 +72,7 @@ Bugfixes:
- GBA Savedata: Update and fix Sharkport importing (fixes mgba.io/i/658)
- OpenGL: Fix some shaders causing offset graphics
- Qt: Fix game unpausing after frame advancing and refocusing
- GB Timer: Fix sub-M-cycle DIV reset timing and edge triggering
Misc:
- SDL: Remove scancode key input
- GBA Video: Clean up unused timers

9
src/gb/timer.c
View File

@ -5,6 +5,7 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <mgba/internal/gb/timer.h>
#include <mgba/internal/lr35902/lr35902.h>
#include <mgba/internal/gb/gb.h>
#include <mgba/internal/gb/io.h>
#include <mgba/internal/gb/serialize.h>
@ -63,11 +64,17 @@ void GBTimerReset(struct GBTimer* timer) {
}
void GBTimerDivReset(struct GBTimer* timer) {
if (timer->internalDiv & (timer->timaPeriod >> 1)) {
++timer->p->memory.io[REG_TIMA];
if (!timer->p->memory.io[REG_TIMA]) {
mTimingSchedule(&timer->p->timing, &timer->irq, 4 - ((timer->p->cpu->executionState + 1) & 3));
}
}
timer->p->memory.io[REG_DIV] = 0;
timer->internalDiv = 0;
timer->nextDiv = GB_DMG_DIV_PERIOD;
mTimingDeschedule(&timer->p->timing, &timer->event);
mTimingSchedule(&timer->p->timing, &timer->event, timer->nextDiv);
mTimingSchedule(&timer->p->timing, &timer->event, timer->nextDiv - ((timer->p->cpu->executionState + 1) & 3));
}
uint8_t GBTimerUpdateTAC(struct GBTimer* timer, GBRegisterTAC tac) {