libretro/mgba
1
0
Fork 0
mirror of https://github.com/libretro/mgba.git synced 2024-12-03 13:50:44 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

GBA Peripherals: Improve BattleChip Gate support

Browse Source
This commit is contained in:
Vicki Pfau 2019-02-14 21:43:16 -08:00
parent a0d0de137c
commit 86b6f2e9cd
2 changed files with 77 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/mgba/gba/interface.h
View File

@ -64,7 +64,8 @@ struct GBASIOBattlechipGate {
struct GBASIODriver d;
struct mTimingEvent event;
uint16_t chipId;
int32_t index;
uint16_t data[2];
int state;
};
void GBASIOBattlechipGateCreate(struct GBASIOBattlechipGate*);

112
src/gba/extra/battlechip.c
View File

@ -13,10 +13,15 @@ mLOG_DECLARE_CATEGORY(GBA_BATTLECHIP);
mLOG_DEFINE_CATEGORY(GBA_BATTLECHIP, "GBA BattleChip Gate", "gba.battlechip");
enum {
BATTLECHIP_INDEX_HANDSHAKE_0 = 0,
BATTLECHIP_INDEX_HANDSHAKE_1 = 1,
BATTLECHIP_INDEX_ID = 2,
BATTLECHIP_INDEX_END = 6
BATTLECHIP_STATE_COMMAND = 0,
BATTLECHIP_STATE_UNK_0 = 1,
BATTLECHIP_STATE_UNK_1 = 2,
BATTLECHIP_STATE_DATA_0 = 3,
BATTLECHIP_STATE_DATA_1 = 4,
BATTLECHIP_STATE_ID = 5,
BATTLECHIP_STATE_UNK_2 = 6,
BATTLECHIP_STATE_UNK_3 = 7,
BATTLECHIP_STATE_END = 8
};
enum {
@ -51,7 +56,9 @@ bool GBASIOBattlechipGateInit(struct GBASIODriver* driver) {
bool GBASIOBattlechipGateLoad(struct GBASIODriver* driver) {
struct GBASIOBattlechipGate* gate = (struct GBASIOBattlechipGate*) driver;
gate->index = BATTLECHIP_INDEX_END;
gate->state = BATTLECHIP_STATE_COMMAND;
gate->data[0] = 0x00FE;
gate->data[1] = 0xFFFE;
return true;
}
@ -91,49 +98,80 @@ void _battlechipTransferEvent(struct mTiming* timing, void* user, uint32_t cycle
gate->d.p->multiplayerControl.busy = 0;
gate->d.p->multiplayerControl.id = 0;
mLOG(GBA_BATTLECHIP, DEBUG, "> %04x", cmd);
mLOG(GBA_BATTLECHIP, DEBUG, "> %04X", cmd);
switch (cmd) {
case 0x4000:
gate->index = 0;
// Fall through
case 0:
switch (gate->index) {
case BATTLECHIP_INDEX_HANDSHAKE_0:
reply = 0x00FE;
switch (gate->state) {
case BATTLECHIP_STATE_COMMAND:
mLOG(GBA_BATTLECHIP, DEBUG, "C %04X", cmd);
switch (cmd) {
case 0x0000:
case 0x8FFF:
case 0xA380:
case 0xA390:
case 0xA3A0:
case 0xA3B0:
case 0xA3C0:
case 0xA3D0:
gate->state = -1;
// Fall through
case 0x5379:
case 0x537A:
case 0x537B:
case 0x537C:
case 0x537D:
case 0x537E:
case 0xD979:
case 0xD97A:
case 0xD97B:
case 0xD97C:
case 0xD97D:
case 0xD97E:
reply = BATTLECHIP_OK;
break;
case BATTLECHIP_INDEX_HANDSHAKE_1:
reply = 0xFFFE;
break;
case BATTLECHIP_INDEX_ID:
reply = gate->chipId;
case 0x5745:
case 0x5746:
case 0x5747:
case 0x5748:
case 0x5749:
case 0x574A:
case 0xFC00:
// Resync
gate->state = BATTLECHIP_STATE_UNK_0;
break;
default:
if (gate->index >= BATTLECHIP_INDEX_END) {
reply = BATTLECHIP_OK;
} else if (gate->index < 0) {
reply = BATTLECHIP_CONTINUE;
} else {
reply = 0;
}
mLOG(GBA_BATTLECHIP, STUB, "? %04X", cmd);
break;
}
++gate->index;
break;
case 0x8FFF:
gate->index = -2;
// Fall through
default:
case 0xA3D0:
case BATTLECHIP_STATE_UNK_0:
case BATTLECHIP_STATE_UNK_1:
reply = 0xFFFF;
break;
case BATTLECHIP_STATE_DATA_0:
reply = gate->data[0];
gate->data[0] += 3;
gate->data[0] &= 0xF0FF;
break;
case BATTLECHIP_STATE_DATA_1:
reply = gate->data[1];
gate->data[1] -= 3;
gate->data[1] |= 0xFE00;
break;
case BATTLECHIP_STATE_ID:
reply = gate->chipId;
break;
case BATTLECHIP_STATE_UNK_2:
case BATTLECHIP_STATE_UNK_3:
reply = 0;
break;
case BATTLECHIP_STATE_END:
reply = BATTLECHIP_OK;
break;
case 0x4234:
case 0x574A:
reply = BATTLECHIP_CONTINUE;
gate->state = -1;
break;
}
++gate->state;
mLOG(GBA_BATTLECHIP, DEBUG, "< %04x", reply);
mLOG(GBA_BATTLECHIP, DEBUG, "< %04X", reply);
gate->d.p->p->memory.io[REG_SIOMULTI1 >> 1] = reply;