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Fix timer bug regression, introduced at 0bc2a11 

Thanks andy for finding the fix!
This commit is contained in:
David Guillen Fandos 2023-04-19 20:00:28 +02:00
parent dec09d465c
commit 413157dedd
3 changed files with 11 additions and 9 deletions
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4
gba_memory.c
View File

@ -238,7 +238,7 @@ static void trigger_timer(u32 timer_number, u32 value)
timer[timer_number].prescale = prescale;
timer[timer_number].irq = ((value >> 6) & 0x1);
write_ioreg(REG_TM0D + (timer_number * 2), (u32)(-timer_reload));
write_ioreg(REG_TMXD(timer_number), (u32)(-timer_reload));
timer_reload <<= prescale;
timer[timer_number].count = timer_reload;
@ -265,7 +265,7 @@ static void trigger_timer(u32 timer_number, u32 value)
timer[timer_number].status = TIMER_INACTIVE;
}
}
write_ioreg(REG_TM0CNT + (timer_number * 2), value);
write_ioreg(REG_TMXCNT(timer_number), value);
}
// This table is configured for sequential access on system defaults

4
gba_memory.h
View File

@ -49,6 +49,10 @@ extern int use_libretro_save_method;
#define DMA_DIRECT_SOUND_B 1
#define DMA_NO_DIRECT_SOUND 2
// Access to timer registers
#define REG_TMXD(n) (REG_TM0D + (2 * (n)))
#define REG_TMXCNT(n) (REG_TM0CNT + (2 * (n)))
typedef struct
{
u32 source_address;

12
main.c
View File

@ -51,7 +51,7 @@ static unsigned update_timers(irq_type *irq_raised, unsigned completed_cycles)
{
timer[i].count -= completed_cycles;
/* io_registers accessors range: REG_TM0D, REG_TM1D, REG_TM2D, REG_TM3D */
write_ioreg(REG_TM0D + (i * 2), -(timer[i].count > timer[i].prescale));
write_ioreg(REG_TMXD(i), -(timer[i].count >> timer[i].prescale));
}
if(timer[i].count > 0)
@ -59,12 +59,12 @@ static unsigned update_timers(irq_type *irq_raised, unsigned completed_cycles)
/* irq_raised value range: IRQ_TIMER0, IRQ_TIMER1, IRQ_TIMER2, IRQ_TIMER3 */
if(timer[i].irq)
*irq_raised |= (8 << i);
*irq_raised |= (IRQ_TIMER0 << i);
if((i != 3) && (timer[i + 1].status == TIMER_CASCADE))
{
timer[i + 1].count--;
write_ioreg(REG_TM0D + (i + 1) * 2, -timer[i+1].count);
write_ioreg(REG_TMXD(i + 1), -timer[i+1].count);
}
if(i < 2)
@ -253,10 +253,8 @@ u32 function_cc update_gba(int remaining_cycles)
for (i = 0; i < 4; i++)
{
if(timer[i].status != TIMER_PRESCALE)
continue;
if(timer[i].count < execute_cycles)
if (timer[i].status == TIMER_PRESCALE &&
timer[i].count < execute_cycles)
execute_cycles = timer[i].count;
}
} while(reg[CPU_HALT_STATE] != CPU_ACTIVE && !reg[COMPLETED_FRAME]);