[232] | 1 | #include "ZumoBuzzer.h"
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| 2 | #include <Arduino.h>
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| 3 |
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| 4 | #define BUZZER_PIN 6
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| 5 |
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| 6 | const char *buzzerSequence = 0;
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| 7 |
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| 8 | // declaring these globals as static means they won't conflict
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| 9 | // with globals in other .cpp files that share the same name
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| 10 | static volatile unsigned int buzzerTimeout = 0; // tracks buzzer time limit
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| 11 | static char play_mode_setting = PLAY_AUTOMATIC;
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| 12 |
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| 13 | extern volatile unsigned char buzzerFinished; // flag: 0 while playing
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| 14 | extern const char *buzzerSequence;
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| 15 |
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| 16 |
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| 17 | static unsigned char use_program_space; // boolean: true if we should
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| 18 | // use program space
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| 19 |
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| 20 | // music settings and defaults
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| 21 | static unsigned char octave = 4; // the current octave
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| 22 | static unsigned int whole_note_duration = 2000; // the duration of a whole note
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| 23 | static unsigned int note_type = 4; // 4 for quarter, etc
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| 24 | static unsigned int duration = 500; // the duration of a note in ms
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| 25 | static unsigned int volume = 15; // the note volume
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| 26 | static unsigned char staccato = 0; // true if playing staccato
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| 27 |
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| 28 | // staccato handling
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| 29 | static unsigned char staccato_rest_duration; // duration of a staccato
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| 30 | // rest, or zero if it is time
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| 31 | // to play a note
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| 32 |
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| 33 | static void nextNote();
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| 34 |
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| 35 | ZumoBuzzer::ZumoBuzzer()
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| 36 | {
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| 37 | }
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| 38 |
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| 39 | inline void ZumoBuzzer::init()
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| 40 | {
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| 41 | }
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| 42 |
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| 43 | void ZumoBuzzer::init2()
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| 44 | {
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| 45 | }
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| 46 |
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| 47 | void ZumoBuzzer::playFrequency(unsigned int freq, unsigned int dur,
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| 48 | unsigned char volume)
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| 49 | {
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| 50 | tone(BUZZER_PIN, freq, dur);
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| 51 | }
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| 52 |
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| 53 | void ZumoBuzzer::playNote(unsigned char note, unsigned int dur,
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| 54 | unsigned char volume)
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| 55 | {
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| 56 | unsigned int freq = 0;
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| 57 | unsigned char offset_note = note - 16;
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| 58 |
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| 59 | if (note == SILENT_NOTE || volume == 0)
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| 60 | {
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| 61 | freq = 1000; // silent notes => use 1kHz freq (for cycle counter)
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| 62 | playFrequency(freq, dur, 0);
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| 63 | return;
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| 64 | }
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| 65 |
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| 66 | if (note <= 16)
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| 67 | offset_note = 0;
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| 68 | else if (offset_note > 95)
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| 69 | offset_note = 95;
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| 70 |
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| 71 | unsigned char exponent = offset_note / 12;
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| 72 |
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| 73 | // frequency table for the lowest 12 allowed notes
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| 74 | // frequencies are specified in tenths of a Hertz for added resolution
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| 75 | switch (offset_note - exponent * 12) // equivalent to (offset_note % 12)
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| 76 | {
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| 77 | case 0: // note E1 = 41.2 Hz
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| 78 | freq = 412;
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| 79 | break;
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| 80 | case 1: // note F1 = 43.7 Hz
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| 81 | freq = 437;
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| 82 | break;
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| 83 | case 2: // note F#1 = 46.3 Hz
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| 84 | freq = 463;
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| 85 | break;
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| 86 | case 3: // note G1 = 49.0 Hz
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| 87 | freq = 490;
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| 88 | break;
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| 89 | case 4: // note G#1 = 51.9 Hz
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| 90 | freq = 519;
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| 91 | break;
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| 92 | case 5: // note A1 = 55.0 Hz
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| 93 | freq = 550;
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| 94 | break;
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| 95 | case 6: // note A#1 = 58.3 Hz
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| 96 | freq = 583;
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| 97 | break;
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| 98 | case 7: // note B1 = 61.7 Hz
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| 99 | freq = 617;
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| 100 | break;
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| 101 | case 8: // note C2 = 65.4 Hz
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| 102 | freq = 654;
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| 103 | break;
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| 104 | case 9: // note C#2 = 69.3 Hz
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| 105 | freq = 693;
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| 106 | break;
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| 107 | case 10: // note D2 = 73.4 Hz
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| 108 | freq = 734;
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| 109 | break;
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| 110 | case 11: // note D#2 = 77.8 Hz
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| 111 | freq = 778;
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| 112 | break;
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| 113 | }
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| 114 |
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| 115 | if (exponent < 7)
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| 116 | {
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| 117 | freq = freq << exponent; // frequency *= 2 ^ exponent
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| 118 | if (exponent > 1) // if the frequency is greater than 160 Hz
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| 119 | freq = (freq + 5) / 10; // we don't need the extra resolution
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| 120 | else
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| 121 | freq += DIV_BY_10; // else keep the added digit of resolution
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| 122 | }
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| 123 | else
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| 124 | freq = (freq * 64 + 2) / 5; // == freq * 2^7 / 10 without int overflow
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| 125 |
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| 126 | if (volume > 15)
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| 127 | volume = 15;
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| 128 | playFrequency(freq, dur, volume); // set buzzer this freq/duration
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| 129 | }
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| 130 |
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| 131 | // Returns 1 if the buzzer is currently playing, otherwise it returns 0
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| 132 | unsigned char ZumoBuzzer::isPlaying()
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| 133 | {
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| 134 | if(buzzerSequence) {
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| 135 | return 1;
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| 136 | }
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| 137 | else {
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| 138 | return 0;
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| 139 | }
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| 140 | }
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| 141 |
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| 142 | #include "ZumoShield_cfg.h"
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| 143 | #include "rca.h"
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| 144 |
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| 145 | void
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| 146 | zumobuzzer_task(intptr_t exinf) {
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| 147 | while(buzzerSequence) {
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| 148 | nextNote();
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| 149 | }
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| 150 | }
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| 151 |
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| 152 | void ZumoBuzzer::play(const char *notes)
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| 153 | {
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| 154 | buzzerSequence = notes;
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| 155 | use_program_space = 0;
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| 156 | staccato_rest_duration = 0;
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| 157 | act_tsk(ZUMOBUZZER_TASK);
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| 158 | }
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| 159 |
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| 160 | void ZumoBuzzer::playFromProgramSpace(const char *notes_p)
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| 161 | {
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| 162 | buzzerSequence = notes_p;
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| 163 | use_program_space = 1;
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| 164 | staccato_rest_duration = 0;
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| 165 | act_tsk(ZUMOBUZZER_TASK);
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| 166 | }
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| 167 |
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| 168 | void ZumoBuzzer::stopPlaying()
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| 169 | {
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| 170 | }
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| 171 |
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| 172 | // Gets the current character, converting to lower-case and skipping
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| 173 | // spaces. For any spaces, this automatically increments sequence!
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| 174 | static char currentCharacter()
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| 175 | {
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| 176 | char c = 0;
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| 177 | do
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| 178 | {
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| 179 | if(use_program_space)
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| 180 | c = pgm_read_byte(buzzerSequence);
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| 181 | else
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| 182 | c = *buzzerSequence;
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| 183 |
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| 184 | if(c >= 'A' && c <= 'Z')
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| 185 | c += 'a'-'A';
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| 186 | } while(c == ' ' && (buzzerSequence ++));
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| 187 |
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| 188 | return c;
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| 189 | }
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| 190 |
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| 191 | // Returns the numerical argument specified at buzzerSequence[0] and
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| 192 | // increments sequence to point to the character immediately after the
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| 193 | // argument.
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| 194 | static unsigned int getNumber()
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| 195 | {
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| 196 | unsigned int arg = 0;
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| 197 |
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| 198 | // read all digits, one at a time
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| 199 | char c = currentCharacter();
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| 200 | while(c >= '0' && c <= '9')
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| 201 | {
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| 202 | arg *= 10;
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| 203 | arg += c-'0';
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| 204 | buzzerSequence ++;
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| 205 | c = currentCharacter();
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| 206 | }
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| 207 |
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| 208 | return arg;
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| 209 | }
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| 210 |
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| 211 | static void nextNote()
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| 212 | {
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| 213 | unsigned char note = 0;
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| 214 | unsigned char rest = 0;
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| 215 | unsigned char tmp_octave = octave; // the octave for this note
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| 216 | unsigned int tmp_duration; // the duration of this note
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| 217 | unsigned int dot_add;
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| 218 |
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| 219 | char c; // temporary variable
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| 220 |
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| 221 | // if we are playing staccato, after every note we play a rest
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| 222 | if(staccato && staccato_rest_duration)
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| 223 | {
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| 224 | ZumoBuzzer::playNote(SILENT_NOTE, staccato_rest_duration, 0);
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| 225 | staccato_rest_duration = 0;
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| 226 | return;
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| 227 | }
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| 228 |
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| 229 | parse_character:
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| 230 |
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| 231 | // Get current character
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| 232 | c = currentCharacter();
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| 233 | buzzerSequence ++;
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| 234 |
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| 235 | // Interpret the character.
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| 236 | switch(c)
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| 237 | {
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| 238 | case '>':
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| 239 | // shift the octave temporarily up
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| 240 | tmp_octave ++;
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| 241 | goto parse_character;
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| 242 | case '<':
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| 243 | // shift the octave temporarily down
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| 244 | tmp_octave --;
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| 245 | goto parse_character;
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| 246 | case 'a':
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| 247 | note = NOTE_A(0);
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| 248 | break;
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| 249 | case 'b':
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| 250 | note = NOTE_B(0);
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| 251 | break;
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| 252 | case 'c':
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| 253 | note = NOTE_C(0);
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| 254 | break;
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| 255 | case 'd':
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| 256 | note = NOTE_D(0);
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| 257 | break;
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| 258 | case 'e':
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| 259 | note = NOTE_E(0);
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| 260 | break;
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| 261 | case 'f':
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| 262 | note = NOTE_F(0);
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| 263 | break;
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| 264 | case 'g':
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| 265 | note = NOTE_G(0);
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| 266 | break;
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| 267 | case 'l':
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| 268 | // set the default note duration
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| 269 | note_type = getNumber();
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| 270 | duration = whole_note_duration/note_type;
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| 271 | goto parse_character;
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| 272 | case 'm':
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| 273 | // set music staccato or legato
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| 274 | if(currentCharacter() == 'l')
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| 275 | staccato = false;
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| 276 | else
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| 277 | {
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| 278 | staccato = true;
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| 279 | staccato_rest_duration = 0;
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| 280 | }
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| 281 | buzzerSequence ++;
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| 282 | goto parse_character;
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| 283 | case 'o':
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| 284 | // set the octave permanently
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| 285 | octave = getNumber();
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| 286 | tmp_octave = octave;
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| 287 | goto parse_character;
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| 288 | case 'r':
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| 289 | // Rest - the note value doesn't matter.
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| 290 | rest = 1;
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| 291 | break;
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| 292 | case 't':
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| 293 | // set the tempo
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| 294 | whole_note_duration = 60*400/getNumber()*10;
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| 295 | duration = whole_note_duration/note_type;
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| 296 | goto parse_character;
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| 297 | case 'v':
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| 298 | // set the volume
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| 299 | volume = getNumber();
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| 300 | goto parse_character;
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| 301 | case '!':
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| 302 | // reset to defaults
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| 303 | octave = 4;
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| 304 | whole_note_duration = 2000;
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| 305 | note_type = 4;
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| 306 | duration = 500;
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| 307 | volume = 15;
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| 308 | staccato = 0;
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| 309 | // reset temp variables that depend on the defaults
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| 310 | tmp_octave = octave;
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| 311 | tmp_duration = duration;
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| 312 | goto parse_character;
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| 313 | default:
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| 314 | buzzerSequence = 0;
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| 315 | return;
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| 316 | }
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| 317 |
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| 318 | note += tmp_octave*12;
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| 319 |
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| 320 | // handle sharps and flats
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| 321 | c = currentCharacter();
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| 322 | while(c == '+' || c == '#')
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| 323 | {
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| 324 | buzzerSequence ++;
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| 325 | note ++;
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| 326 | c = currentCharacter();
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| 327 | }
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| 328 | while(c == '-')
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| 329 | {
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| 330 | buzzerSequence ++;
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| 331 | note --;
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| 332 | c = currentCharacter();
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| 333 | }
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| 334 |
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| 335 | // set the duration of just this note
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| 336 | tmp_duration = duration;
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| 337 |
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| 338 | // If the input is 'c16', make it a 16th note, etc.
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| 339 | if(c > '0' && c < '9')
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| 340 | tmp_duration = whole_note_duration/getNumber();
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| 341 |
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| 342 | // Handle dotted notes - the first dot adds 50%, and each
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| 343 | // additional dot adds 50% of the previous dot.
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| 344 | dot_add = tmp_duration/2;
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| 345 | while(currentCharacter() == '.')
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| 346 | {
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| 347 | buzzerSequence ++;
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| 348 | tmp_duration += dot_add;
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| 349 | dot_add /= 2;
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| 350 | }
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| 351 |
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| 352 | if(staccato)
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| 353 | {
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| 354 | staccato_rest_duration = tmp_duration / 2;
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| 355 | tmp_duration -= staccato_rest_duration;
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| 356 | }
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| 357 |
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| 358 | // this will re-enable the timer1 overflow interrupt
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| 359 | ZumoBuzzer::playNote(rest ? SILENT_NOTE : note, tmp_duration, volume);
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| 360 | delay(tmp_duration*1.5);
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| 361 | }
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| 362 |
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| 363 | void ZumoBuzzer::playMode(unsigned char mode)
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| 364 | {
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| 365 | }
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| 366 |
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| 367 | unsigned char ZumoBuzzer::playCheck()
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| 368 | {
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| 369 | return 0;
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| 370 | }
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