pwmsnd.h

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#ifndef _PWMSND_H
#define _PWMSND_H
 
#define PWMSND_GPIO 19  // PWM output GPIO pin (0..29)
#define PWMSND_SLICE    ((PWMSND_GPIO>>1)&7) // PWM slice index (=1)
#define PWMSND_CHAN (PWMSND_GPIO&1) // PWM channel index (=1)
 
#define SOUNDRATE   22050   // sound rate [Hz]
#define PWMSND_TOP  255 // PRM top (period = PWMSND_TOP + 1 = 256)
#define PWMSND_CLOCK    (SOUNDRATE*(PWMSND_TOP+1)) // PWM clock (= 22050*256 = 5644800)
 
#define SNDFRAC 10  // number of fraction bits
#define SNDINT (1<<SNDFRAC) // integer part of sound fraction
 
// current sound
extern const u8* CurSound;  // current playing sound
extern volatile int SoundCnt;   // counter of current playing sound (<=0 no sound)
extern int SoundInc;        // pointer increment
extern volatile int SoundAcc;   // pointer accumulator
extern const u8* NextSound; // next sound to play repeated sound
extern int NextSoundCnt;    // counter of next sound (0=no repeated sound)
 
void PWMSndInit();
 
void PlaySound(const u8* snd, int len, Bool rep = False, float speed = 1.0f);
 
void StopSound();
 
// update sound speed (1=normal speed)
void SpeedSound(float speed);
 
Bool PlayingSound();
 
void SetNextSound(const u8* snd, int len);
 
 
#endif // _PWMSND_H