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@@ -377,6 +377,55 @@ You can currently send 4 hex digits with your OS-specific modifier key (RALT for Enable the backlight from the Makefile. +## Driving a speaker - audio support + +Your keyboard can make sounds! If you've got a Planck, Preonic, or basically any keyboard that allows access to the C6 port, you can hook up a simple speaker and have it beep. You can use those beeps to indicate layer transitions, modifiers, special keys, or just to play some funky 8bit tunes. + +The audio code lives in [quantum/audio/audio.h](/quantum/audio/audio.h) and in the other files in the audio directory. It's enabled by default on the Planck [stock keymap](/keyboard/planck/keymaps/default/keymap.c). Here are the important bits: + +``` +#include "audio.h" +``` + +Then, lower down the file: + +``` +float tone_startup[][2] = { + ED_NOTE(_E7 ), + E__NOTE(_CS7), + E__NOTE(_E6 ), + E__NOTE(_A6 ), + M__NOTE(_CS7, 20) +}; +``` + +This is how you write a song. Each of these lines is a note, so we have a little ditty composed of five notes here. + +Then, we have this chunk: + +``` +float tone_qwerty[][2] = SONG(QWERTY_SOUND); +float tone_dvorak[][2] = SONG(DVORAK_SOUND); +float tone_colemak[][2] = SONG(COLEMAK_SOUND); +float tone_plover[][2] = SONG(PLOVER_SOUND); +float tone_plover_gb[][2] = SONG(PLOVER_GOODBYE_SOUND); + +float music_scale[][2] = SONG(MUSIC_SCALE_SOUND); +float goodbye[][2] = SONG(GOODBYE_SOUND); +``` + +Wherein we bind predefined songs (from [audio/song_list.h](/audio/song_list.h)) into named variables. This is one optimization that helps save on memory: These songs only take up memory when you reference them in your keymap, because they're essentially all preprocessor directives. + +So now you have something called `tone_plover` for example. How do you make it play the Plover tune, then? If you look further down the keymap, you'll see this: + +``` +PLAY_NOTE_ARRAY(tone_plover, false, 0); // Signature is: Song name, repeat, rest style +``` + +This is inside one of the macros. So when that macro executes, your keyboard plays that particular chime. + +"Rest style" in the method signature above (the last parameter) specifies if there's a rest (a moment of silence) between the notes. + ## MIDI functionalty This is still a WIP, but check out `quantum/keymap_midi.c` to see what's happening. Enable from the Makefile. |