Jared DiCarlo / Mbed 2 deprecated Player2

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Dependencies:   mbed

player.h@0:6679ec22f0e5, 2019-11-10 (annotated)

Committer:
dicarloj
Date:
Sun Nov 10 23:19:38 2019 +0000
Revision:
0:6679ec22f0e5
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
dicarloj 0:6679ec22f0e5 1 #ifndef PLAYER_H
dicarloj 0:6679ec22f0e5 2 #define PLAYER_H
dicarloj 0:6679ec22f0e5 3
dicarloj 0:6679ec22f0e5 4 #include <stdint.h>
dicarloj 0:6679ec22f0e5 5 #include <stdio.h>
dicarloj 0:6679ec22f0e5 6
dicarloj 0:6679ec22f0e5 7 // Midi player for tesla coils
dicarloj 0:6679ec22f0e5 8 // - adjusts duty cycle to prevent coil from exploding when many notes play simultaneously
dicarloj 0:6679ec22f0e5 9 // - messes with phase offset to work around 1-bit output resolution of tesla coil when possible
dicarloj 0:6679ec22f0e5 10
dicarloj 0:6679ec22f0e5 11 // set this to audio sample frequency
dicarloj 0:6679ec22f0e5 12 #define SAMPLE_FREQEUENCY 48000
dicarloj 0:6679ec22f0e5 13
dicarloj 0:6679ec22f0e5 14 #define CHEATER_FREQUENCY_MULT_POWER 9
dicarloj 0:6679ec22f0e5 15
dicarloj 0:6679ec22f0e5 16 // maximum number of notes that can be played
dicarloj 0:6679ec22f0e5 17 // if this is too large, the code will be slow
dicarloj 0:6679ec22f0e5 18 // it this is too small, notes might be left out
dicarloj 0:6679ec22f0e5 19 #define MAX_NOTES 10
dicarloj 0:6679ec22f0e5 20
dicarloj 0:6679ec22f0e5 21 // 64-bit struct representing a single note to be played
dicarloj 0:6679ec22f0e5 22 // each tick is 1/sample_frequency long
dicarloj 0:6679ec22f0e5 23 // notes contain:
dicarloj 0:6679ec22f0e5 24 // - starting time (up to 2^32 ticks, ~1 day at 50 kHz)
dicarloj 0:6679ec22f0e5 25 // - duration (up to 2^24 ticks, ~6 minutes at 50 kHz)
dicarloj 0:6679ec22f0e5 26 // * the lower 16 bits of duration are stored in _duration
dicarloj 0:6679ec22f0e5 27 // - note (midi notes are 0-255, this is looked up in the frequency table)
dicarloj 0:6679ec22f0e5 28 struct Note {
dicarloj 0:6679ec22f0e5 29 Note(uint32_t start, uint32_t duration, uint8_t note) :
dicarloj 0:6679ec22f0e5 30 _note(note) {
dicarloj 0:6679ec22f0e5 31 if(start >= (1 << 16))
dicarloj 0:6679ec22f0e5 32 printf("! start tick %d is too long\n", start);
dicarloj 0:6679ec22f0e5 33 _start_tick = start & 0xffff;
dicarloj 0:6679ec22f0e5 34 if(duration >= (1 << 8))
dicarloj 0:6679ec22f0e5 35 printf("! Duration %d is too long\n", duration);
dicarloj 0:6679ec22f0e5 36 _duration = duration & 0xff;
dicarloj 0:6679ec22f0e5 37 }
dicarloj 0:6679ec22f0e5 38 uint16_t _start_tick;
dicarloj 0:6679ec22f0e5 39 uint8_t _duration;
dicarloj 0:6679ec22f0e5 40 uint8_t _note;
dicarloj 0:6679ec22f0e5 41 };
dicarloj 0:6679ec22f0e5 42
dicarloj 0:6679ec22f0e5 43
dicarloj 0:6679ec22f0e5 44 // set this to the Note array for the song
dicarloj 0:6679ec22f0e5 45 extern Note* song;
dicarloj 0:6679ec22f0e5 46
dicarloj 0:6679ec22f0e5 47 // set this to the length of the Note array
dicarloj 0:6679ec22f0e5 48 extern uint32_t songLength;
dicarloj 0:6679ec22f0e5 49
dicarloj 0:6679ec22f0e5 50 // this becomes true when the song is done playing
dicarloj 0:6679ec22f0e5 51 extern bool songDone;
dicarloj 0:6679ec22f0e5 52
dicarloj 0:6679ec22f0e5 53
dicarloj 0:6679ec22f0e5 54 // call this at SAMPLE_FREQUENCY to determine if the output should be enabled or not
dicarloj 0:6679ec22f0e5 55 uint16_t play();
dicarloj 0:6679ec22f0e5 56
dicarloj 0:6679ec22f0e5 57 // call this once BEFORE calling play the first time and every time after switching songs
dicarloj 0:6679ec22f0e5 58 void initialize_play();
dicarloj 0:6679ec22f0e5 59
dicarloj 0:6679ec22f0e5 60 #endif // PLAYER_H