[26d7f34] | 1 | /**********************************************************************
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| 2 | * Music Player for the ATMega8
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| 3 | * Uses all 3 timers for generating a 2voices, 1bit sound.
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| 4 | * Copyright 2010, Adrien Destugues <pulkomandy@pulkomandy.ath.cx>
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| 5 | * Distributed under the terms of the MIT licence
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| 6 | **********************************************************************/
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| 7 |
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| 8 | #include <avr/io.h>
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| 9 | #include <avr/interrupt.h>
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| 10 | #include <avr/wdt.h>
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| 11 | #include <avr/pgmspace.h>
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| 12 | #include <util/delay.h>
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| 13 |
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| 14 | #include <string.h>
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| 15 | #include <stdbool.h>
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| 16 |
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| 17 | #define C2_SoundOn() TCCR2 |= (1<<CS22)|(1<<CS20) /* enable timer */
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| 18 | #define C2_SoundOff() TCCR2 &= ~((1<<CS22)|(1<<CS20)) /* disable timer */
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| 19 | #define C2_SetFreq(f) OCR2 = (f)
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| 20 |
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| 21 | #define C1_SoundOn() TCCR1B |= (1<<CS12) /* enable timer */
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| 22 | #define C1_SoundOff() TCCR1B &= ~(1<<CS12) /* disable timer */
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| 23 | #define C1_SetFreq(f) OCR1A = (f)
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| 24 |
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| 25 | typedef enum {
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| 26 | S, // silence
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| 27 | N, // normal
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| 28 | A, // arpeggio
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| 29 | V, // vibrato
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| 30 | T, // tremolo
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| 31 | } FX;
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| 32 |
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| 33 | // A note is made of frequency, duration, and a boolean indicating if it is
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| 34 | // silence or a real note. Things that should be changed here :
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| 35 | // * Have a note value instead of an hardcoded frequency,and have an octave
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| 36 | // * Allow for effects (arpegio, vibrato for example)
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| 37 | typedef struct {
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| 38 | unsigned char n; // note
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| 39 | unsigned char d; // length
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| 40 | FX f; // FX
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| 41 | unsigned char p; // params
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| 42 | } C2_Note;
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| 43 |
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| 44 | // Mapping of notes to OCR2 values for timer 2.
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| 45 | static const char Note2Reg[] = {
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| 46 | 0xEC,
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| 47 | 0xE0,
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| 48 | 0xD1,
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| 49 | 0xC4,
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| 50 | 0xB8,
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| 51 | 0xAF,
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| 52 | 0xA6,
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| 53 | 0x9F,
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| 54 | 0x97,
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| 55 | 0x8D,
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| 56 | 0x84,
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| 57 | 0x7E,
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| 58 |
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| 59 | 0x76,
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| 60 | 0x6F,
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| 61 | 0x6A,
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| 62 | 0x64,
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| 63 | 0x5E,
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| 64 | 0x58,
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| 65 | 0x53,
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| 66 | 0x4F,
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| 67 | 0x4A,
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| 68 | 0x45,
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| 69 | 0x42,
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| 70 | 0x3F,
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| 71 |
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| 72 | 0x3B, // C
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| 73 | 0x37, // C#
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| 74 | 0x34, // D
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| 75 | 0x32, // D#
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| 76 | 0x2F, // E
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| 77 | 0x2C, // F
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| 78 | 0x29, // F#
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| 79 | 0x27, // G
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| 80 | 0x25, // G#
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| 81 | 0x23, // A
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| 82 | 0x21, // A#
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| 83 | 0x1F, // B
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| 84 |
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| 85 | 0x1D, // C
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| 86 | 0x1B, // C#
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| 87 | 0x1A, // D
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| 88 | 0x18, // D#
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| 89 | 0x17, // E
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| 90 | 0x16, // F
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| 91 | 0x14, // F#
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| 92 | 0x13, // G
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| 93 | 0x12, // G#
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| 94 | 0x11, // A
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| 95 | 0x10, // A#
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| 96 | 0xF // B
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| 97 | //0xE, // C
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| 98 | //0xD // C#
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| 99 | };
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| 100 |
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| 101 | #define C(n) 12*n
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| 102 | #define Cs(n) C(n)+1
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| 103 | #define D(n) C(n)+2
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| 104 | #define Ds(n) C(n)+3
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| 105 | #define E(n) C(n)+4
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| 106 | #define F(n) C(n)+5
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| 107 | #define Fs(n) C(n)+6
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| 108 | #define G(n) C(n)+7
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| 109 | #define Gs(n) C(n)+8
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| 110 | #define A(n) C(n)+9
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| 111 | #define As(n) C(n)+10
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| 112 | #define B(n) C(n)+11
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| 113 |
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| 114 | // Song data. A list of notes. Looped.
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| 115 | /*
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| 116 | static const C2_Note song[] = {
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| 117 | { G(2), 10, N, 0x00 },
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| 118 | { 0, 1, S, 0x00 },
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| 119 | { G(2), 10, N, 0x00 },
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| 120 | { 0, 1, S, 0x00 },
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| 121 | { G(2), 10, N, 0x00 },
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| 122 | { 0, 1, S, 0x00 },
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| 123 | { Ds(2), 7, N, 0x00 },
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| 124 | { As(2), 4, N, 0x00 },
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| 125 | { G(2), 10, N, 0x00 },
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| 126 | { 0, 1, S, 0x00 },
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| 127 | { Ds(2), 7, N, 0x00 },
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| 128 | { As(2), 4, N, 0x00 },
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| 129 | { G(2), 10, N, 0x00 },
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| 130 | { 0, 7, S, 0x00 },
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| 131 |
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| 132 | { D(3), 10, N, 0x00 },
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| 133 | { 0, 1, S, 0x00 },
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| 134 | { D(3), 10, N, 0x00 },
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| 135 | { 0, 1, S, 0x00 },
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| 136 | { D(3), 10, N, 0x00 },
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| 137 | { 0, 1, S, 0x00 },
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| 138 | { Ds(3), 7, N, 0x00 },
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| 139 | { As(2), 4, N, 0x00 },
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| 140 | { Fs(2), 10, N, 0x00 },
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| 141 | { 0, 1, S, 0x00 },
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| 142 | { Ds(2), 7, N, 0x00 },
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| 143 | { As(2), 4, N, 0x00 },
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| 144 | { G(2), 10, N, 0x00 },
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| 145 | { 0, 7, S, 0x00 },
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| 146 |
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| 147 | { G(3), 10, N, 0x00 },
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| 148 | { 0, 1, S, 0x00 },
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| 149 | { G(3), 10, N, 0x00 },
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| 150 | { 0, 1, S, 0x00 },
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| 151 | { G(3), 10, N, 0x00 },
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| 152 | { 0, 1, S, 0x00 },
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| 153 | { G(3), 6, N, 0x00 },
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| 154 | { 0, 1, S, 0x00 },
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| 155 | { Fs(3), 2, N, 0x00 },
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| 156 | { F(3), 2, N, 0x00 },
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| 157 | { E(3), 3, N, 0x00 },
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| 158 | { Ds(3), 7, N, 0x00 },
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| 159 | { 0, 1, S, 0x00 },
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| 160 | { E(2), 4, N, 0x00 },
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| 161 | { Gs(2), 10, N, 0x00 },
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| 162 | { 0, 4, S, 0x00 },
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| 163 |
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| 164 | { Cs(3), 4, N, 0x00 },
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| 165 | { C(3), 4, N, 0x00 },
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| 166 | { B(2), 4, N, 0x00 },
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| 167 | { As(2), 4, N, 0x00 },
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| 168 | { A(2), 4, N, 0x00 },
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| 169 |
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| 170 |
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| 171 | { 0, 40, S, 0x00 },
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| 172 | {0,0,0} // Song end marker - zero-length note
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| 173 | };
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| 174 | */
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| 175 |
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| 176 | static const C2_Note song[] PROGMEM = {
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| 177 | { E(3), 8, N, 0x00 },
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| 178 | { B(2), 4, N, 0x00 },
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| 179 | { C(3), 4, N, 0x00 },
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| 180 | { D(3), 4, N, 0x00 },
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| 181 | { 0 , 4, S, 0x00 },
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| 182 | { C(3), 4, N, 0x00 },
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| 183 | { B(2), 4, N, 0x00 },
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| 184 | { A(2), 4, N, 0x00 },
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| 185 | { 0 , 4, S, 0x00 },
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| 186 | { A(2), 4, N, 0x00 },
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| 187 | { C(3), 4, N, 0x00 },
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| 188 | { E(3), 4, N, 0x00 },
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| 189 | { 0 , 4, S, 0x00 },
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| 190 | { D(3), 4, N, 0x00 },
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| 191 | { C(3), 4, N, 0x00 },
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| 192 | { B(2), 4, N, 0x00 },
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| 193 | { 0 , 8, S, 0x00 },
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| 194 | { C(3), 4, N, 0x00 },
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| 195 | { D(3), 8, N, 0x00 },
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| 196 | { E(3), 8, N, 0x00 },
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| 197 | { C(3), 8, N, 0x00 },
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| 198 | { A(2), 7, N, 0x00 },
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| 199 | { 0 , 1, S, 0x00 },
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| 200 | { A(2), 8, N, 0x00 },
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| 201 | { 0 , 8, S, 0x00 },
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| 202 |
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| 203 | { D(3), 12, N, 0x00 },
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| 204 | { F(3), 4, N, 0x00 },
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| 205 | { A(3), 8, N, 0x00 },
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| 206 | { G(3), 4, N, 0x00 },
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| 207 | { F(3), 4, N, 0x00 },
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| 208 | { E(3), 8, N, 0x00 },
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| 209 | { 0 , 4, S, 0x00 },
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| 210 | { C(3), 4, N, 0x00 },
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| 211 | { E(3), 8, N, 0x00 },
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| 212 | { D(3), 4, N, 0x00 },
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| 213 | { C(3), 4, N, 0x00 },
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| 214 | { B(2), 4, N, 0x00 },
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| 215 | { 0 , 8, S, 0x00 },
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| 216 | { C(3), 4, N, 0x00 },
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| 217 | { D(3), 8, N, 0x00 },
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| 218 | { E(3), 8, N, 0x00 },
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| 219 | { C(3), 8, N, 0x00 },
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| 220 | { A(2), 7, N, 0x00 },
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| 221 | { 0 , 1, S, 0x00 },
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| 222 | { A(2), 8, N, 0x00 },
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| 223 | { 0 , 8, S, 0x00 },
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| 224 |
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| 225 | /*
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| 226 | { E(3), 8, N, 0x00 },
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| 227 | { B(2), 4, N, 0x00 },
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| 228 | { C(3), 4, N, 0x00 },
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| 229 | { D(3), 4, N, 0x00 },
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| 230 | { 0 , 4, S, 0x00 },
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| 231 | { C(3), 4, N, 0x00 },
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| 232 | { B(2), 4, N, 0x00 },
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| 233 | { A(2), 4, N, 0x00 },
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| 234 | { 0 , 4, S, 0x00 },
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| 235 | { A(2), 4, N, 0x00 },
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| 236 | { C(3), 4, N, 0x00 },
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| 237 | { E(3), 4, N, 0x00 },
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| 238 | { 0 , 4, S, 0x00 },
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| 239 | { D(3), 4, N, 0x00 },
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| 240 | { C(3), 4, N, 0x00 },
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| 241 | { B(2), 4, N, 0x00 },
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| 242 | { 0 , 8, S, 0x00 },
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| 243 | { C(3), 4, N, 0x00 },
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| 244 | { D(3), 8, N, 0x00 },
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| 245 | { E(3), 8, N, 0x00 },
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| 246 | { C(3), 8, N, 0x00 },
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| 247 | { A(2), 7, N, 0x00 },
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| 248 | { 0 , 1, S, 0x00 },
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| 249 | { A(2), 8, N, 0x00 },
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| 250 | { 0 , 8, S, 0x00 },
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| 251 |
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| 252 | { D(3), 12, N, 0x00 },
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| 253 | { F(3), 4, N, 0x00 },
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| 254 | { A(3), 8, N, 0x00 },
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| 255 | { G(3), 4, N, 0x00 },
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| 256 | { F(3), 4, N, 0x00 },
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| 257 | { E(3), 8, N, 0x00 },
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| 258 | { 0 , 4, S, 0x00 },
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| 259 | { C(3), 4, N, 0x00 },
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| 260 | { E(3), 8, N, 0x00 },
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| 261 | { D(3), 4, N, 0x00 },
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| 262 | { C(3), 4, N, 0x00 },
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| 263 | { B(2), 4, N, 0x00 },
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| 264 | { 0 , 8, S, 0x00 },
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| 265 | { C(3), 4, N, 0x00 },
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| 266 | { D(3), 8, N, 0x00 },
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| 267 | { E(3), 8, N, 0x00 },
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| 268 | { C(3), 8, N, 0x00 },
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| 269 | { A(2), 7, N, 0x00 },
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| 270 | { 0 , 1, S, 0x00 },
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| 271 | { A(2), 8, N, 0x00 },
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| 272 | { 0 , 8, S, 0x00 },
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| 273 | */
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| 274 | { E(3), 16, N, 0x00 },
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| 275 | { C(3), 16, N, 0x00 },
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| 276 | { D(3), 16, N, 0x00 },
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| 277 | { B(2), 16, N, 0x00 },
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| 278 | { C(3), 16, N, 0x00 },
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| 279 | { A(2), 16, N, 0x00 },
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| 280 | { G(2), 16, N, 0x00 },
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| 281 | { Gs(2), 16, N, 0x00 },
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| 282 |
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| 283 | { 0 , 8, S, 0x00 },
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| 284 |
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| 285 | { E(3), 16, N, 0x00 },
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| 286 | { C(3), 16, N, 0x00 },
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| 287 | { D(3), 16, N, 0x00 },
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| 288 | { B(2), 16, N, 0x00 },
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| 289 |
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| 290 | { C(3), 8, N, 0x00 },
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| 291 | { D(3), 8, N, 0x00 },
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| 292 |
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| 293 | {0,0,S,0} // Song end marker - zero-length note
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| 294 | };
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| 295 |
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| 296 | static const C2_Note song2[] PROGMEM = {
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| 297 | { C(2), 4, N, 0x00 },
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| 298 | { C(3), 4, N, 0x00 },
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| 299 | { C(2), 4, N, 0x00 },
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| 300 | { C(3), 4, N, 0x00 },
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| 301 | { C(2), 4, N, 0x00 },
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| 302 | { C(3), 4, N, 0x00 },
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| 303 | { C(2), 4, N, 0x00 },
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| 304 | { C(3), 4, N, 0x00 },
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| 305 |
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| 306 | { G(2), 4, N, 0x00 },
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| 307 | { G(3), 4, N, 0x00 },
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| 308 | { G(2), 4, N, 0x00 },
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| 309 | { G(3), 4, N, 0x00 },
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| 310 | { G(2), 4, N, 0x00 },
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| 311 | { G(3), 4, N, 0x00 },
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| 312 | { G(2), 4, N, 0x00 },
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| 313 | { G(3), 4, N, 0x00 },
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| 314 |
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| 315 | { E(2), 4, N, 0x00 },
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| 316 | { E(3), 4, N, 0x00 },
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| 317 | { E(2), 4, N, 0x00 },
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| 318 | { E(3), 4, N, 0x00 },
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| 319 | { B(1), 4, N, 0x00 },
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| 320 | { B(2), 4, N, 0x00 },
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| 321 | { B(1), 4, N, 0x00 },
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| 322 | { B(2), 4, N, 0x00 },
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| 323 |
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| 324 | { C(2), 4, N, 0x00 },
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| 325 | { C(3), 4, N, 0x00 },
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| 326 | { C(2), 4, N, 0x00 },
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| 327 | { C(3), 4, N, 0x00 },
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| 328 | { C(2), 16, N, 0x00 },
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| 329 |
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| 330 | {0,0,S,0} // Song end marker - zero-length note
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| 331 | };
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| 332 |
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| 333 | // This allows us to know where we are in the song.
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| 334 | volatile int tick;
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| 335 |
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| 336 | // Timer 0 interrupt handler
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| 337 | ISR(TIMER0_OVF_vect)
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| 338 | {
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| 339 | tick++;
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| 340 | }
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| 341 |
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| 342 | void main() {
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| 343 | // WATCHDOG
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| 344 | wdt_enable(WDTO_2S);
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| 345 |
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| 346 | // TIMER 0 : timebase, 1 tick every 1ms
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| 347 | TCCR0 =(1<<CS02) | (1<<CS00); // prescaler /1024
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| 348 | TIMSK = 1 << TOIE0; // enable timer interrupt
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| 349 | tick = 0;
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| 350 |
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| 351 | // TIMER 1 : Freq generator
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| 352 | TCCR1A = (1<<COM1A0);
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| 353 | TCCR1B = (1<<WGM12);
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| 354 |
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| 355 | OCR1A = 0x5E;
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| 356 |
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| 357 | // TIMER 2 : Frequency generator (on OC2)
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| 358 | // CTC mode allows us to set the frequency through OCR2 register
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| 359 | // Prescaler is set to 1024 in C2_SoundOn.
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| 360 | TCCR2 = (1<<WGM21) // CTC
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| 361 | |(1<<COM20); // toggle output on match
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| 362 | ASSR = 0; // Disable async mode
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| 363 |
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| 364 | // Port B as output so we can use the timers
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| 365 | DDRB = 255;
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| 366 |
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| 367 | // Enable interrupts
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| 368 | sei();
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| 369 |
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| 370 |
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| 371 | // TEST
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| 372 | //OCR2 = 0xFF;
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| 373 | //C2_SoundOn();
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| 374 |
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| 375 | int step = 0;
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| 376 | int step2 = 0;
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| 377 | long nexttime = 0;
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| 378 | long nexttime2 = 0;
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| 379 | long time = 0;
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| 380 | char subtick = 0;
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| 381 | char subtick2 = 0;
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| 382 | C2_Note current = song[0];
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| 383 | C2_Note current2 = song2[0];
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| 384 |
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| 385 | PORTB = 0xFF;
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| 386 |
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| 387 | // Main loop
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| 388 | while(1) {
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| 389 | wdt_reset();
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| 390 |
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| 391 | // PLAYER CODE
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| 392 | if (tick) {
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| 393 | tick--;
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| 394 |
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| 395 |
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| 396 | // CHANNEL 1 ---------------------------------
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| 397 | if (nexttime <= time) {
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| 398 | current = song2[step];
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| 399 | step++;
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| 400 | subtick = 0;
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| 401 | // Go to next step
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| 402 | nexttime = time + current.d;
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| 403 | if(current.f != 0) C1_SoundOn();
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| 404 | else C1_SoundOff();
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| 405 |
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| 406 | // Test if song is finished, if so loop over
|
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| 407 | if (current.p == S && current.d == 0) {
|
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| 408 | step = 0;
|
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| 409 | time = 0;
|
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| 410 | nexttime = 1;
|
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| 411 | }
|
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| 412 | }
|
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| 413 |
|
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| 414 | subtick++;
|
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| 415 | switch (current.f) {
|
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| 416 | default: case N: C1_SetFreq(Note2Reg[current.n]); break;
|
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| 417 | case A:
|
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| 418 | switch(subtick) {
|
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| 419 | case 0: C1_SetFreq(Note2Reg[current.n + ((current.p&0xF0)>>8)]); break;
|
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| 420 | case 1: C1_SetFreq(Note2Reg[current.n]); break;
|
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| 421 | case 2: C1_SetFreq(Note2Reg[current.n + (current.p&0xF)]); subtick = 0; break;
|
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| 422 | }
|
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| 423 | break;
|
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| 424 | case V: C1_SetFreq(Note2Reg[current.n]-current.p/2+subtick%current.p); break;
|
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| 425 | case T: if(subtick%current.p == 0) { C1_SoundOn(); C1_SetFreq(Note2Reg[current.n]); } else C1_SoundOff(); break;
|
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| 426 | }
|
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| 427 |
|
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| 428 |
|
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| 429 | // CHANNEL 2 -------------------------------
|
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| 430 | if (nexttime2 <= time) {
|
---|
| 431 | current2 = song[step2];
|
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| 432 | step2++;
|
---|
| 433 | subtick2 = 0;
|
---|
| 434 | // Go to next step
|
---|
| 435 | nexttime2 = time + current2.d;
|
---|
| 436 | if(current2.f != 0) C2_SoundOn();
|
---|
| 437 | else C2_SoundOff();
|
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| 438 |
|
---|
| 439 | // Test if song is finished, if so loop over
|
---|
| 440 | if (current2.p == S && current2.d == 0) {
|
---|
| 441 | step2 = 0;
|
---|
| 442 | time = 0;
|
---|
| 443 | nexttime2 = 1;
|
---|
| 444 | }
|
---|
| 445 | }
|
---|
| 446 |
|
---|
| 447 | subtick2++;
|
---|
| 448 | switch (current2.f) {
|
---|
| 449 | default: case N: C2_SetFreq(Note2Reg[current2.n]); break;
|
---|
| 450 | case A:
|
---|
| 451 | switch(subtick2) {
|
---|
| 452 | case 0: C2_SetFreq(Note2Reg[current2.n + ((current2.p&0xF0)>>8)]); break;
|
---|
| 453 | case 1: C2_SetFreq(Note2Reg[current2.n]); break;
|
---|
| 454 | case 2: C2_SetFreq(Note2Reg[current2.n + (current2.p&0xF)]); subtick2 = 0; break;
|
---|
| 455 | }
|
---|
| 456 | break;
|
---|
| 457 | case V: C2_SetFreq(Note2Reg[current2.n]-current2.p/2+subtick2%current2.p); break;
|
---|
| 458 | case T: if(subtick2%current2.p == 0) { C2_SoundOn(); C2_SetFreq(Note2Reg[current2.n]); } else C2_SoundOff(); break;
|
---|
| 459 | }
|
---|
| 460 |
|
---|
| 461 |
|
---|
| 462 | time++;
|
---|
| 463 | }
|
---|
| 464 | }
|
---|
| 465 | }
|
---|
| 466 |
|
---|