PVB/shrooms-vb-core
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Implement communication port

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This commit is contained in:
GuyPerfect
2024-10-28 19:11:33 -05:00
parent da001e02cd
commit e828d99da1
5 changed files with 261 additions and 29 deletions
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core/game-pad.c
+9 -8
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@@ -9,12 +9,12 @@
static void padEmulate(VB *sim, uint32_t clocks) {
/* No hardware read in progress */
if (sim->pad.si_stat == 0)
if (!sim->pad.si_stat)
return;
/* Hardware read completes after time to process */
if (sim->pad.si_stat > clocks) {
sim->pad.si_stat -= clocks;
if (sim->pad.clocks > clocks) {
sim->pad.clocks -= clocks;
return;
}
@@ -38,7 +38,7 @@ static int32_t padReadControl(VB *sim) {
sim->pad.k_int_inh << 7 |
sim->pad.para_si << 5 |
sim->pad.soft_ck << 4 |
!!sim->pad.si_stat << 1 |
sim->pad.si_stat << 1 |
sim->pad.s_abt_dis
;
}
@@ -78,7 +78,8 @@ static void padWriteControl(VB *sim, uint8_t value) {
sim->pad.si_stat == 0 && /* No hardware read underway */
!sim->pad.s_abt_dis /* Hardware reads enabled */
) {
sim->pad.si_stat = 10240; /* 512us */
sim->pad.clocks = 10240; /* 512us */
sim->pad.si_stat = 1;
sim->pad.step = 0; /* Abort software read */
}
@@ -86,7 +87,7 @@ static void padWriteControl(VB *sim, uint8_t value) {
sim->pad.para_si = value >> 5 & 1;
if (
sim->pad.para_si &&
sim->pad.si_stat == 0 /* No hardware read underway */
!sim->pad.si_stat /* No hardware read underway */
) sim->pad.step = 32;
/* Signal a bit for a software read */
@@ -107,8 +108,8 @@ static void padWriteControl(VB *sim, uint8_t value) {
/* Determine how many clocks are guaranteed to process */
static uint32_t padUntil(VB *sim, uint32_t clocks) {
return sim->pad.si_stat != 0 && sim->pad.si_stat < clocks ?
sim->pad.si_stat : clocks;
return sim->pad.si_stat && sim->pad.clocks < clocks ?
sim->pad.clocks : clocks;
}