static void write(RomMapperNet* rm, UInt16 address, UInt8 value)
{
if (address < 0x3ff0 || address >= 0x3ff8) {
return;
}
switch (address & 0x3fff) {
case 0x3ff0:
ym2151Write(rm->ym2151, 0, value);
break;
case 0x3ff1:
ym2151Write(rm->ym2151, 1, value);
break;
case 0x3ff2:
rm->kbdLatch = value;
break;
case 0x3ff3:
ym2148SetVector(rm->ym2148, value);
break;
case 0x3ff4:
boardSetDataBus(value, value, 1);
ym2151SetIrqVector(rm->ym2151, value);
break;
case 0x3ff5:
ym2148WriteData(rm->ym2148, value);
break;
case 0x3ff6:
ym2148WriteCommand(rm->ym2148, value);
break;
}
}
static void onRecv(YM2148* midi, UInt32 time)
{
midi->timeRecv = 0;
if (midi->status & STAT_RXRDY) {
midi->status |= STAT_OE;
if (midi->command & CMD_RSTER) {
ym2148Reset(midi);
return;
}
}
if (midi->rxPending != 0) {
archSemaphoreWait(midi->semaphore, -1);
midi->rxData = midi->rxQueue[(midi->rxHead - midi->rxPending) & (RX_QUEUE_SIZE - 1)];
midi->rxPending--;
archSemaphoreSignal(midi->semaphore);
midi->status |= STAT_RXRDY;
if (midi->command & CMD_RDINT) {
boardSetDataBus(midi->vector, 0, 0);
boardSetInt(0x800);
midi->status |= ST_INT;
}
}
midi->timeRecv = boardSystemTime() + midi->charTime;
boardTimerAdd(midi->timerRecv, midi->timeRecv);
}
void ym2151Irq(void* ptr, int irq)
{
YM2151* ym2151 = (YM2151*)ptr;
if (irq) {
boardSetDataBus(ym2151->irqVector, 0, 0);
boardSetInt(0x40);
}
else {
boardClearInt(0x40);
}
}
static void onTrans(YM2148* midi, UInt32 time)
{
midi->timeTrans = 0;
if (midi->status & STAT_TXEMPTY) {
midi->txPending = 0;
}
else {
midiIoTransmit(midi->midiIo, midi->txBuffer);
midi->timeTrans = boardSystemTime() + midi->charTime;
boardTimerAdd(midi->timerTrans, midi->timeTrans);
midi->status |= STAT_TXEMPTY;
if (midi->command & CMD_WRINT) {
boardSetDataBus(midi->vector, 0, 0);
boardSetInt(0x800);
midi->status |= ST_INT;
}
}
}
static void ym2148WriteCommand(YM2148* midi, UInt8 value)
{
UInt8 oldValue = midi->command;
midi->command = value;
if (value & CMD_RST) {
ym2148Reset(midi);
return;
}
if (value & CMD_TXINT) {
if ((midi->status & STAT_TXEMPTY) && (value & CMD_TXEN)) {
if (midi->command & CMD_TXINT) {
boardSetDataBus(midi->vector, 0, 0);
boardSetInt(0x800);
midi->status |= ST_INT;
}
}
}
}
static void onTrans(YM2148* midi, UInt32 time)
{
midi->timeTrans = 0;
midiIoTransmit(midi->midiIo, midi->sendByte);
if (midi->status & STAT_TXRDY) {
midi->status |= STAT_TXEMPTY;
if (midi->command & CMD_TXINT) {
boardSetDataBus(midi->vector, 0, 0);
boardSetInt(0x800);
midi->status |= ST_INT;
}
}
else {
midi->status |= STAT_TXRDY;
midi->status &= ~STAT_TXEMPTY;
midi->sendByte = midi->sendBuffer;
midi->timeTrans = boardSystemTime() + midi->charTime;
boardTimerAdd(midi->timerTrans, midi->timeTrans);
}
}
static void ym2148SetVector(YM2148* midi, UInt8 value)
{
midi->vector = value;
boardSetDataBus(midi->vector, 0, 0);
}
