sound.h

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/*
 * sound.h
 *
 * Created: 25.08.2011 09:53:05
 *  Author: rolo
 */ 


#ifndef SOUND_H_
#define SOUND_H_

extern uint8_t  sndToneCnt;
extern uint8_t  sndSeqPlaying;

extern uint8_t  sndErrorSeq[];
extern uint8_t  sndSuccessSeq[];
extern uint8_t  sndBigBenSeq[];
extern uint8_t  sndSig1[];
extern uint8_t  sndSig2[];

extern uint8_t  *musicPtr;

void    SndToneOn(uint16_t tone);
void    SndToneOff(void);
void    PlayTone(uint16_t tone,uint8_t duration);
void    PlayNote(uint8_t note,uint8_t duration);
void    PlaySequence(uint8_t *seq);

static inline void  InitSound()
{
    sndToneCnt=0;
    sndSeqPlaying=0;
    musicPtr=0; // no sequence currently playing
    
    TCCR3A=0b01000011;  // Toggle OC3A on compare match
    TCCR3B=0b00011000;  // Fast PWM, clock off
}


static inline void  SndTimerCallback()
{
    if (sndToneCnt>0)
    {
        sndToneCnt--;
        if (sndToneCnt==0)
        {
            if (musicPtr!=0)    // Another note to play
            {
                if (*(musicPtr+1)==0)   // duration 0?
                {
                    musicPtr=0; // end of sequence
                    SndToneOff();
                }
                else
                {
                    PlayNote(*musicPtr,*(musicPtr+1));
                    musicPtr+=2;
                }
            } else
            {
                SndToneOff();
            }
        }
    }
}



#endif /* SOUND_H_ */