void MPU401_Event(void) {
/* SOFTMPU */
Bit8u i;
Bitu new_time;
if (mpu.mode==M_UART) return;
if (mpu.state.irq_pending) goto next_event;
for (i=0;i<8;i++) { /* Decrease counters */
if (mpu.state.amask&(1<<i)) {
mpu.playbuf[i].counter--;
if (mpu.playbuf[i].counter<=0) UpdateTrack(i);
}
}
if (mpu.state.conductor) {
mpu.condbuf.counter--;
if (mpu.condbuf.counter<=0) UpdateConductor();
}
if (mpu.clock.clock_to_host) {
mpu.clock.cth_counter++;
if (mpu.clock.cth_counter >= mpu.clock.cth_rate) {
mpu.clock.cth_counter=0;
mpu.state.req_mask|=(1<<13);
}
}
if (!mpu.state.irq_pending && mpu.state.req_mask) MPU401_EOIHandler();
next_event:
PIC_RemoveEvents(MPU_EVENT);
if ((new_time=mpu.clock.tempo*mpu.clock.timebase)==0) return;
PIC_AddEvent(MPU_EVENT,(Bitu)MPU401_TIMECONSTANT/new_time);
}
//Updates counters and requests new data on "End of Input"
static void MPU401_EOIHandler(void *p)
{
mpu_t *mpu = (mpu_t *)p;
uint8_t i;
pclog("MPU-401 end of input callback\n");
mpu401_eoi_callback = 0;
mpu->state.eoi_scheduled=0;
if (mpu->state.send_now)
{
mpu->state.send_now=0;
if (mpu->state.cond_req) UpdateConductor(mpu);
else UpdateTrack(mpu, mpu->state.channel);
}
mpu->state.irq_pending=0;
if (!mpu->state.playing || !mpu->state.req_mask) return;
i=0;
do {
if (mpu->state.req_mask&(1<<i)) {
QueueByte(mpu, 0xf0+i);
mpu->state.req_mask&=~(1<<i);
break;
}
} while ((i++)<16);
}
static void MPU401_Event(void *p)
{
mpu_t *mpu = (mpu_t *)p;
uint8_t i;
int new_time;
pclog("MPU-401 event callback\n");
if (mpu->mode==M_UART)
{
mpu401_event_callback = 0;
return;
}
if (mpu->state.irq_pending) goto next_event;
for (i=0;i<8;i++) { /* Decrease counters */
if (mpu->state.amask&(1<<i)) {
mpu->playbuf[i].counter--;
if (mpu->playbuf[i].counter<=0) UpdateTrack(mpu, i);
}
}
if (mpu->state.conductor) {
mpu->condbuf.counter--;
if (mpu->condbuf.counter<=0) UpdateConductor(mpu);
}
if (mpu->clock.clock_to_host) {
mpu->clock.cth_counter++;
if (mpu->clock.cth_counter >= mpu->clock.cth_rate) {
mpu->clock.cth_counter=0;
mpu->state.req_mask|=(1<<13);
}
}
if (!mpu->state.irq_pending && mpu->state.req_mask) MPU401_EOIHandler(mpu);
next_event:
/* mpu401_event_callback = 0; */
new_time = (mpu->clock.tempo * mpu->clock.timebase);
if (new_time == 0)
{
mpu401_event_callback = 0;
return;
}
else
{
mpu401_event_callback += (MPU401_TIMECONSTANT/new_time) * 1000 * TIMER_USEC;
pclog("Next event after %i us (time constant: %i)\n", (int) ((MPU401_TIMECONSTANT/new_time) * 1000 * TIMER_USEC), (int) MPU401_TIMECONSTANT);
}
}
//Updates counters and requests new data on "End of Input"
void MPU401_EOIHandler(void) {
Bit8u i=0; /* SOFTMPU */
mpu.state.eoi_scheduled=false;
if (mpu.state.send_now) {
mpu.state.send_now=false;
if (mpu.state.cond_req) UpdateConductor();
else UpdateTrack(mpu.state.channel);
}
mpu.state.irq_pending=false;
if (!mpu.state.playing || !mpu.state.req_mask) return;
do {
if (mpu.state.req_mask&(1<<i)) {
QueueByte(0xf0+i);
mpu.state.req_mask&=~(1<<i);
break;
}
} while ((i++)<16);
}
