mirror of https://github.com/mgba-emu/mgba.git
GBA SIO: Add RCNT bitfield
This commit is contained in:
parent
914d879811
commit
0425dadee9
|
@ -52,6 +52,15 @@ DECL_BITS(GBASIOMultiplayer, Id, 4, 2);
|
||||||
DECL_BIT(GBASIOMultiplayer, Error, 6);
|
DECL_BIT(GBASIOMultiplayer, Error, 6);
|
||||||
DECL_BIT(GBASIOMultiplayer, Busy, 7);
|
DECL_BIT(GBASIOMultiplayer, Busy, 7);
|
||||||
DECL_BIT(GBASIOMultiplayer, Irq, 14);
|
DECL_BIT(GBASIOMultiplayer, Irq, 14);
|
||||||
|
DECL_BITFIELD(GBASIORegisterRCNT, uint16_t);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, Sc, 0);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, Sd, 1);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, Si, 2);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, So, 3);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, ScDirection, 4);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, SdDirection, 5);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, SiDirection, 6);
|
||||||
|
DECL_BIT(GBASIORegisterRCNT, SoDirection, 7);
|
||||||
|
|
||||||
struct GBASIODriverSet {
|
struct GBASIODriverSet {
|
||||||
struct GBASIODriver* normal;
|
struct GBASIODriver* normal;
|
||||||
|
|
|
@ -86,11 +86,7 @@ static void _switchMode(struct GBASIO* sio) {
|
||||||
if (sio->activeDriver && sio->activeDriver->deviceId) {
|
if (sio->activeDriver && sio->activeDriver->deviceId) {
|
||||||
id = sio->activeDriver->deviceId(sio->activeDriver);
|
id = sio->activeDriver->deviceId(sio->activeDriver);
|
||||||
}
|
}
|
||||||
if (id) {
|
sio->rcnt = GBASIORegisterRCNTSetSi(sio->rcnt, !!id);
|
||||||
sio->rcnt |= 4;
|
|
||||||
} else {
|
|
||||||
sio->rcnt &= ~4;
|
|
||||||
}
|
|
||||||
break;
|
break;
|
||||||
default:
|
default:
|
||||||
// TODO
|
// TODO
|
||||||
|
@ -417,9 +413,17 @@ void GBASIOMultiplayerFinishTransfer(struct GBASIO* sio, uint16_t data[4], uint3
|
||||||
sio->p->memory.io[GBA_REG(SIOMULTI1)] = data[1];
|
sio->p->memory.io[GBA_REG(SIOMULTI1)] = data[1];
|
||||||
sio->p->memory.io[GBA_REG(SIOMULTI2)] = data[2];
|
sio->p->memory.io[GBA_REG(SIOMULTI2)] = data[2];
|
||||||
sio->p->memory.io[GBA_REG(SIOMULTI3)] = data[3];
|
sio->p->memory.io[GBA_REG(SIOMULTI3)] = data[3];
|
||||||
sio->rcnt |= 1;
|
|
||||||
sio->siocnt = GBASIOMultiplayerClearBusy(sio->siocnt);
|
sio->siocnt = GBASIOMultiplayerClearBusy(sio->siocnt);
|
||||||
sio->siocnt = GBASIOMultiplayerSetId(sio->siocnt, id);
|
sio->siocnt = GBASIOMultiplayerSetId(sio->siocnt, id);
|
||||||
|
|
||||||
|
// This SC level is actually a transient pulse, and probably a hardware glitch.
|
||||||
|
// Based on analog sampling it seems to just be a spike when the other lines deassert.
|
||||||
|
// It rapidly falls down to GND but it's high enough that it's read out as a 1 for
|
||||||
|
// several microseconds, likely around 300-500 cycles. I have not measured if and when
|
||||||
|
// it returns to 0 afterwards.
|
||||||
|
sio->rcnt = GBASIORegisterRCNTFillSc(sio->rcnt);
|
||||||
|
|
||||||
if (GBASIOMultiplayerIsIrq(sio->siocnt)) {
|
if (GBASIOMultiplayerIsIrq(sio->siocnt)) {
|
||||||
GBARaiseIRQ(sio->p, GBA_IRQ_SIO, cyclesLate);
|
GBARaiseIRQ(sio->p, GBA_IRQ_SIO, cyclesLate);
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue