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PIT counters' null_count variables are now set to 1 on counter reload to make sure the readouts after counter reload are correct, fixes MR BIOS'es on interpreter (still broken on the recompiler because of another issue specifically related to the PIT on the recompiler), among other things.

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OBattler
2020-05-06 03:43:37 +02:00
parent 3dd3396a2c
commit 8cda5aee20
1 changed files with 4 additions and 2 deletions
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6
src/pit.c
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@@ -368,7 +368,7 @@ ctr_latch_status(ctr_t *ctr)
static void
ctr_latch_count(ctr_t *ctr)
{
int count = (ctr->latch || (ctr->state == 1)) ? ctr->l : ctr->count;
int count = (ctr->latch || ctr->null_count || (ctr->state == 1)) ? ctr->l : ctr->count;
switch (ctr->rm & 0x03) {
case 0x00:
@@ -575,6 +575,8 @@ pit_write(uint16_t addr, uint8_t val, void *priv)
case 1:
case 2: /* the actual timers */
ctr = &dev->counters[t];
/* Reloading timer count, so set null_count to 1. */
ctr->null_count = 1;
switch (ctr->wm) {
case 0:
@@ -642,7 +644,7 @@ pit_read(uint16_t addr, void *priv)
break;
}
count = (ctr->state == 1) ? ctr->l : ctr->count;
count = (ctr->null_count || (ctr->state == 1)) ? ctr->l : ctr->count;
if (ctr->latched) {
ret = (ctr->rl) >> ((ctr->rm & 0x80) ? 8 : 0);