void coopTimerStart(int timer, ClockDivider divider, u16 ticks, VoidFn callback)
{
timer &= 3;
TIMER_DATA(timer) = ticks;
if (callback)
{
coopIrqSet(IRQ_TIMER(timer), callback);
irqEnable(IRQ_TIMER(timer));
TIMER_CR(timer) = TIMER_IRQ_REQ | divider | TIMER_ENABLE;
}else
TIMER_CR(timer) = divider | TIMER_ENABLE;
}
//---------------------------------------------------------------------------------
void timerStart(int timer, ClockDivider divider, u16 ticks, VoidFn callback){
//---------------------------------------------------------------------------------
sassert(timer < 4, "timer must be in range 0 - 3");
TIMER_DATA(timer) = ticks;
if(callback)
{
irqSet(IRQ_TIMER(timer), callback);
irqEnable(IRQ_TIMER(timer));
TIMER_CR(timer) = TIMER_IRQ_REQ | divider | TIMER_ENABLE;
}
else
{
TIMER_CR(timer) = divider | TIMER_ENABLE;
}
}
// Play one 48th of a measure of music
static void stage_step() {
REG_IME = 0;
int halt = 0;
switch(REG_IF) {
case IRQ_TIMER(0) :
if(!--wait) {
if(sound_data[index].CH1_FRQ) {
REG_SND1SWP = sound_data[index].CH1_SWP;
REG_SND1ENV = sound_data[index].CH1_ENV;
REG_SND1FRQ = sound_data[index].CH1_FRQ;
}
if(sound_data[index].CH2_FRQ) {
REG_SND2ENV = sound_data[index].CH2_ENV;
REG_SND2FRQ = sound_data[index].CH2_FRQ;
}
if(sound_data[index].CH4_FRQ) {
REG_SND4ENV = sound_data[index].CH4_ENV;
REG_SND4FRQ = sound_data[index].CH4_FRQ;
}
wait = sound_data[index].LEN;
if(++index == 257) {
if(1) {
index = 0;
} else {
halt = 1;
}
}
}
break;
default:
break;
}
REG_IF = REG_IF;
if(!halt) {
REG_IME = IRQ_ENABLE;
}
}
// Begin playing the music
void stage_play() {
REG_IME = 0;
REG_ISR_MAIN = stage_step;
REG_IE = IRQ_TIMER(0);
REG_TMD(0) = BPM_QUAN_TRANSFORM;
REG_TMCNT(0) = TM_ENABLE | TM_IRQ | TM_FREQ_1024;
REG_SNDSTAT = MASTER_SND_EN;
REG_SNDDMGCNT = CHAN_EN_L(1) |
CHAN_EN_R(1) |
CHAN_EN_L(2) |
CHAN_EN_R(2) |
CHAN_EN_L(4) |
CHAN_EN_R(4) |
LEFT_VOL(7) |
RIGHT_VOL(7);
index = 0;
wait = 1;
REG_IME = IRQ_ENABLE;
}