void timeHnd(void){
u8 tr,doTimer;
timer_int(0);
timer_enable(0);
timer_clearstat();
for(tr=0; tr<NUM_TRACKS; tr++){
if(trackTable[tr].play == 0) continue;
if(trackTable[tr].data[trackTable[tr].currNote].tickPosition == musicTick &&
trackTable[tr].data[trackTable[tr].currNote].onoff == 0x09){//Start note
while(trackTable[tr].data[trackTable[tr].currNote+1].tickPosition == musicTick && //Look for the last note in a cord and play that one.
trackTable[tr].data[trackTable[tr].currNote+1].onoff == 0x09) trackTable[tr].currNote++;
SND_REGS[tr].SxFQH=(FREQUENCY[trackTable[tr].data[trackTable[tr].currNote].note]>>8) & 0xFF;
SND_REGS[tr].SxFQL=FREQUENCY[trackTable[tr].data[trackTable[tr].currNote].note] & 0xFF;
SND_REGS[tr].SxLRV=trackTable[tr].volume;
SND_REGS[tr].SxRAM = tr;
trackTable[tr].offNote = 0;
SND_REGS[tr].SxINT = 0x9F;
}
/*some midi's don't have off notes so this sets a max length for a given note*/
trackTable[tr].offNote++;
if(trackTable[tr].offNote > MAX_NOTE_LENGTH){
SND_REGS[tr].SxINT = 0x00;
}
while(trackTable[tr].data[trackTable[tr].currNote].tickPosition <= musicTick &&
trackTable[tr].data[trackTable[tr].currNote].tickPosition != 0xFFFFFFFF){
trackTable[tr].currNote++;
}
if(trackTable[tr].data[trackTable[tr].currNote].tickPosition == 0xFFFFFFFF){
trackTable[tr].play = 0;
trackTable[tr].currNote = 0;
SND_REGS[tr].SxINT=0;
}
}
musicTick++;
doTimer = 0x00;
for(tr=0; tr<NUM_TRACKS; tr++){
if(trackTable[tr].play == 1) doTimer = 0x01;
}
if(doTimer){
timer_int(1);
timer_enable(1);
}
}
void DoSound(u16 timerCount){
u8 i;
for(i=0; i<NUM_TRACKS; i++){
trackTable[i].currNote = 0;
}
musicTick = 0;
timer_freq(1);
timer_set(timerCount);
timer_enable(1);
timer_int(1);
HW_REGS[BKCOL] = ~HW_REGS[BKCOL];
}
void conf_timers(void){
TCNT0=0;
TCNT1=0;
OCR0A=LINE_LIMIT;
OCR1A=COLUMN_LIMIT;
TCCR0A|=1<<WGM01;
TCCR0B|=1<<CS02;
TCCR0B|=1<<CS00;
TCCR1B|=1<<WGM12;
TCCR1B|=1<<CS12;
TCCR1B|=1<<CS10;
TIFR0=0;
TIFR1=0;
timer_int(1);
}
