Classic 1 bit sound - z88dk/z88dk GitHub Wiki
Many targets supported by z88dk support a 1 bit speaker, toggling this bit can result in sound effects. The classic library provides portable routines to create sound FX and play music.
The bit_fx(int) function family provides ready made sound effects. The sounds have been split into groups of 8.
bit_fx(0) Short hi-pitch decreasing "gulp/fall" sound
bit_fx(1) Fast increasing scale
bit_fx(2) Fast increasing squeak, mid duration, high pitch
bit_fx(3) Crash sound, mid duration
bit_fx(4) Fast increasing squeak/jump, short duration
bit_fx(5) Short two tones clackson sound
bit_fx(6) Two tones mid/high pitch bright beep
bit_fx(7) Medium duration moving down, then up
bit_fx2(0) Sort of electronic synth, mid-low tone, mid duration
bit_fx2(1) Mid duration low tone, beating waves effect
bit_fx2(2) Quick low pitch electronic buzz/noise
bit_fx2(3) Long two tones truck clackson
bit_fx2(4) Two tones increasing sound, electr. fx, mid duration
bit_fx2(5) Two tones bounce sound
bit_fx2(6) Alt. two tones bounce sound
bit_fx2(7) Long low explosion sound
bit_fx3(0) Quick noisy high pitch buzz / break noise
bit_fx3(1) Longer very noisy high pitch buzz
bit_fx3(2) Very quick low electronic noise / explosion / drum
bit_fx3(3) Short low explosion sound
bit_fx3(4) Electronic zap, mid duration
bit_fx3(5) Noisy high pitch short increasing sound
bit_fx3(6) Low level noise (AM radio noise)
bit_fx3(7) Quick high pitch tremolo sound
bit_fx4(0) Very quick squeaky sound
bit_fx4(1) Tape rewind effect, long duration
bit_fx4(2) Fast squeak/bounce/duck sound
bit_fx4(3) Fall-down, mid duration
bit_fx4(4) High pitch fall-down sound, long duration
bit_fx4(5) Short high pitch slightly noisy decreasing sound
bit_fx4(6) Short jump sound
bit_fx4(7) Very quick duck squeak
void bit_synth(int duration, int frequency1, int frequency2, int frequency3, int frequency4)
Polyphony and multitimbric effects
void bit_beep(int duration, int period)
Standard beeper: the pitch is defined with the "period" parameter, but is influenced by the CPU speed; the higher the value, the lower the tone.
void bit_frequency(double_t duration, double_t frequency)
Play a note at the specified frequency. The CPU speed doesn't affect the frequency, but some floating point is involved (you need lo link in the proper math library at compile time).
void bit_play(unsigned char melody[])
Just play a song. For example:
bit_play("2A--A-B-CDEFGAB5C+");
void bit_open()
Initialize the sound hardware.
void bit_close()
Do whatever is needed to restore the sound hardware into a quiet position.
void bit_clock()
Just move the sound bit.. a tiny tick will be heard. Can be useful to create sound effects in software loops (i.e. engine noise for a game).