1 | // Squawk Soft-Synthesizer Library for Arduino
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2 | //
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3 | // Davey Taylor 2013
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4 | // d.taylor@arduino.cc
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5 |
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6 | #include "Squawk.h"
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7 |
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8 | // Period range, used for clamping
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9 | #define PERIOD_MIN 28
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10 | #define PERIOD_MAX 3424
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11 |
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12 | // Convenience macros
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13 | #define LO4(V) ((V) & 0x0F)
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14 | #define HI4(V) (((V) & 0xF0) >> 4)
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15 | #define MIN(A, B) ((A) < (B) ? (A) : (B))
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16 | #define MAX(A, B) ((A) > (B) ? (A) : (B))
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17 | #define FREQ(PERIOD) (tuning_long / (PERIOD))
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18 |
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19 | // SquawkStream class for PROGMEM data
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20 | class StreamROM : public SquawkStream {
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21 | private:
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22 | uint8_t *p_start;
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23 | uint8_t *p_cursor;
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24 | public:
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25 | StreamROM(const uint8_t *p_rom = NULL) { p_start = p_cursor = (uint8_t*)p_rom; }
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26 | uint8_t read() { return pgm_read_byte(p_cursor++); }
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27 | void seek(size_t offset) { p_cursor = p_start + offset; }
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28 | };
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29 |
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30 | // Oscillator memory
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31 | typedef struct {
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32 | uint8_t fxp;
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33 | uint8_t offset;
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34 | uint8_t mode;
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35 | } pto_t;
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36 |
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37 | // Deconstructed cell
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38 | typedef struct {
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39 | uint8_t fxc, fxp, ixp;
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40 | } cel_t;
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41 |
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42 | // Effect memory
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43 | typedef struct {
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44 | int8_t volume;
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45 | uint8_t port_speed;
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46 | uint16_t port_target;
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47 | bool glissando;
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48 | pto_t vibr;
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49 | pto_t trem;
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50 | uint16_t period;
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51 | uint8_t param;
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52 | } fxm_t;
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53 |
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54 | // Locals
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55 | static uint8_t order_count;
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56 | static uint8_t order[64];
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57 | static uint8_t speed;
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58 | static uint8_t tick;
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59 | static uint8_t ix_row;
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60 | static uint8_t ix_order;
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61 | static uint8_t ix_nextrow;
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62 | static uint8_t ix_nextorder;
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63 | static uint8_t row_delay;
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64 | static fxm_t fxm[4];
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65 | static cel_t cel[4];
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66 | static uint32_t tuning_long;
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67 | static uint16_t sample_rate;
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68 | static float tuning = 1.0;
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69 | static uint16_t tick_rate = 50;
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70 |
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71 | static SquawkStream *stream;
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72 | static uint16_t stream_base;
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73 | static StreamROM rom;
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74 |
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75 | // Imports
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76 | extern intptr_t squawk_register;
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77 | extern uint16_t cia;
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78 |
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79 | // Exports
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80 | osc_t osc[4];
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81 | uint8_t pcm = 128;
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82 |
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83 | // ProTracker period tables
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84 | const uint16_t period_tbl[84] PROGMEM = {
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85 | 3424, 3232, 3048, 2880, 2712, 2560, 2416, 2280, 2152, 2032, 1920, 1814,
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86 | 1712, 1616, 1524, 1440, 1356, 1280, 1208, 1140, 1076, 1016, 960, 907,
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87 | 856, 808, 762, 720, 678, 640, 604, 570, 538, 508, 480, 453,
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88 | 428, 404, 381, 360, 339, 320, 302, 285, 269, 254, 240, 226,
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89 | 214, 202, 190, 180, 170, 160, 151, 143, 135, 127, 120, 113,
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90 | 107, 101, 95, 90, 85, 80, 75, 71, 67, 63, 60, 56,
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91 | 53, 50, 47, 45, 42, 40, 37, 35, 33, 31, 30, 28,
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92 | };
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93 |
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94 | // ProTracker sine table
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95 | const int8_t sine_tbl[32] PROGMEM = {
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96 | 0x00, 0x0C, 0x18, 0x25, 0x30, 0x3C, 0x47, 0x51, 0x5A, 0x62, 0x6A, 0x70, 0x76, 0x7A, 0x7D, 0x7F,
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97 | 0x7F, 0x7F, 0x7D, 0x7A, 0x76, 0x70, 0x6A, 0x62, 0x5A, 0x51, 0x47, 0x3C, 0x30, 0x25, 0x18, 0x0C,
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98 | };
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99 |
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100 | // Squawk object
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101 | SquawkSynth Squawk;
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102 |
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103 | // Look up or generate waveform for ProTracker vibrato/tremolo oscillator
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104 | static int8_t do_osc(pto_t *p_osc) {
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105 | int8_t sample = 0;
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106 | int16_t mul;
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107 | switch(p_osc->mode & 0x03) {
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108 | case 0: // Sine
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109 | sample = pgm_read_byte(&sine_tbl[(p_osc->offset) & 0x1F]);
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110 | if(p_osc->offset & 0x20) sample = -sample;
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111 | break;
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112 | case 1: // Square
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113 | sample = (p_osc->offset & 0x20) ? 127 : -128;
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114 | break;
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115 | case 2: // Saw
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116 | sample = -(p_osc->offset << 2);
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117 | break;
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118 | case 3: // Noise (random)
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119 | sample = rand();
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120 | break;
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121 | }
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122 | mul = sample * LO4(p_osc->fxp);
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123 | p_osc->offset = (p_osc->offset + HI4(p_osc->fxp));
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124 | return mul >> 6;
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125 | }
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126 |
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127 | // Calculates and returns arpeggio period
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128 | // Essentially finds period of current note + halftones
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129 | static inline uint16_t arpeggio(uint8_t ch, uint8_t halftones) {
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130 | uint8_t n;
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131 | for(n = 0; n != 47; n++) {
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132 | if(fxm[ch].period >= pgm_read_word(&period_tbl[n])) break;
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133 | }
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134 | return pgm_read_word(&period_tbl[MIN(n + halftones, 47)]);
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135 | }
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136 |
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137 | // Calculates and returns glissando period
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138 | // Essentially snaps a sliding frequency to the closest note
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139 | static inline uint16_t glissando(uint8_t ch) {
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140 | uint8_t n;
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141 | uint16_t period_h, period_l;
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142 | for(n = 0; n != 47; n++) {
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143 | period_l = pgm_read_word(&period_tbl[n]);
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144 | period_h = pgm_read_word(&period_tbl[n + 1]);
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145 | if(fxm[ch].period < period_l && fxm[ch].period >= period_h) {
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146 | if(period_l - fxm[ch].period <= fxm[ch].period - period_h) {
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147 | period_h = period_l;
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148 | }
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149 | break;
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150 | }
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151 | }
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152 | return period_h;
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153 | }
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154 |
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155 | // Tunes Squawk to a different frequency
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156 | void SquawkSynth::tune(float new_tuning) {
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157 | tuning = new_tuning;
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158 | tuning_long = (long)(((double)3669213184.0 / (double)sample_rate) * (double)tuning);
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159 |
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160 | }
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161 |
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162 | // Sets tempo
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163 | void SquawkSynth::tempo(uint16_t new_tempo) {
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164 | tick_rate = new_tempo;
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165 | cia = sample_rate / tick_rate; // not atomic?
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166 | }
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167 |
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168 | // Initializes Squawk
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169 | // Sets up the selected port, and the sample grinding ISR
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170 | void SquawkSynth::begin(uint16_t hz) {
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171 | word isr_rr;
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172 |
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173 | sample_rate = hz;
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174 | tuning_long = (long)(((double)3669213184.0 / (double)sample_rate) * (double)tuning);
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175 | cia = sample_rate / tick_rate;
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176 |
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177 | if(squawk_register == (intptr_t)&OCR0A) {
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178 | // Squawk uses PWM on OCR0A/PD5(ATMega328/168)/PB7(ATMega32U4)
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179 | #ifdef __AVR_ATmega32U4__
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180 | DDRB |= 0b10000000; // TODO: FAIL on 32U4
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181 | #else
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182 | DDRD |= 0b01000000;
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183 | #endif
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184 | TCCR0A = 0b10000011; // Fast-PWM 8-bit
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185 | TCCR0B = 0b00000001; // 62500Hz
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186 | OCR0A = 0x7F;
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187 | } else if(squawk_register == (intptr_t)&OCR0B) {
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188 | // Squawk uses PWM on OCR0B/PC5(ATMega328/168)/PD0(ATMega32U4)
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189 | #ifdef __AVR_ATmega32U4__
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190 | DDRD |= 0b00000001;
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191 | #else
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192 | DDRD |= 0b00100000;
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193 | #endif // Set timer mode to
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194 | TCCR0A = 0b00100011; // Fast-PWM 8-bit
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195 | TCCR0B = 0b00000001; // 62500Hz
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196 | OCR0B = 0x7F;
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197 | #ifdef OCR2A
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198 | } else if(squawk_register == (intptr_t)&OCR2A) {
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199 | // Squawk uses PWM on OCR2A/PB3
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200 | DDRB |= 0b00001000; // Set timer mode to
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201 | TCCR2A = 0b10000011; // Fast-PWM 8-bit
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202 | TCCR2B = 0b00000001; // 62500Hz
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203 | OCR2A = 0x7F;
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204 | #endif
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205 | #ifdef OCR2B
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206 | } else if(squawk_register == (intptr_t)&OCR2B) {
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207 | // Squawk uses PWM on OCR2B/PD3
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208 | DDRD |= 0b00001000; // Set timer mode to
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209 | TCCR2A = 0b00100011; // Fast-PWM 8-bit
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210 | TCCR2B = 0b00000001; // 62500Hz
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211 | OCR2B = 0x7F;
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212 | #endif
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213 | #ifdef OCR3AL
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214 | } else if(squawk_register == (intptr_t)&OCR3AL) {
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215 | // Squawk uses PWM on OCR3AL/PC6
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216 | DDRC |= 0b01000000; // Set timer mode to
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217 | TCCR3A = 0b10000001; // Fast-PWM 8-bit
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218 | TCCR3B = 0b00001001; // 62500Hz
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219 | OCR3AH = 0x00;
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220 | OCR3AL = 0x7F;
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221 | #endif
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222 | } else if(squawk_register == (intptr_t)&SPDR) {
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223 | // NOT YET SUPPORTED
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224 | // Squawk uses external DAC via SPI
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225 | // TODO: Configure SPI
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226 | // TODO: Needs SS toggle in sample grinder
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227 | } else if(squawk_register == (intptr_t)&PORTB) {
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228 | // NOT YET SUPPORTED
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229 | // Squawk uses resistor ladder on PORTB
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230 | // TODO: Needs shift right in sample grinder
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231 | DDRB = 0b11111111;
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232 | } else if(squawk_register == (intptr_t)&PORTC) {
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233 | // NOT YET SUPPORTED
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234 | // Squawk uses resistor ladder on PORTC
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235 | // TODO: Needs shift right in sample grinder
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236 | DDRC = 0b11111111;
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237 | }
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238 |
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239 | // Seed LFSR (needed for noise)
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240 | osc[3].freq = 0x2000;
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241 |
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242 | // Set up ISR to run at sample_rate (may not be exact)
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243 | isr_rr = F_CPU / sample_rate;
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244 | TCCR1A = 0b00000000; // Set timer mode
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245 | TCCR1B = 0b00001001;
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246 | OCR1AH = isr_rr >> 8; // Set freq
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247 | OCR1AL = isr_rr & 0xFF;
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248 | }
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249 |
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250 | // Decrunches a 9 byte row into a useful data
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251 | static void decrunch_row() {
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252 | uint8_t data;
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253 |
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254 | // Initial decrunch
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255 | stream->seek(stream_base + ((order[ix_order] << 6) + ix_row) * 9);
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256 | data = stream->read(); cel[0].fxc = data << 0x04;
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257 | cel[1].fxc = data & 0xF0;
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258 | data = stream->read(); cel[0].fxp = data;
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259 | data = stream->read(); cel[1].fxp = data;
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260 | data = stream->read(); cel[2].fxc = data << 0x04;
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261 | cel[3].fxc = data >> 0x04;
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262 | data = stream->read(); cel[2].fxp = data;
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263 | data = stream->read(); cel[3].fxp = data;
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264 | data = stream->read(); cel[0].ixp = data;
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265 | data = stream->read(); cel[1].ixp = data;
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266 | data = stream->read(); cel[2].ixp = data;
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267 |
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268 | // Decrunch extended effects
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269 | if(cel[0].fxc == 0xE0) { cel[0].fxc |= cel[0].fxp >> 4; cel[0].fxp &= 0x0F; }
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270 | if(cel[1].fxc == 0xE0) { cel[1].fxc |= cel[1].fxp >> 4; cel[1].fxp &= 0x0F; }
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271 | if(cel[2].fxc == 0xE0) { cel[2].fxc |= cel[2].fxp >> 4; cel[2].fxp &= 0x0F; }
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272 |
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273 | // Decrunch cell 3 ghetto-style
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274 | cel[3].ixp = ((cel[3].fxp & 0x80) ? 0x00 : 0x7F) | ((cel[3].fxp & 0x40) ? 0x80 : 0x00);
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275 | cel[3].fxp &= 0x3F;
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276 | switch(cel[3].fxc) {
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277 | case 0x02:
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278 | case 0x03: if(cel[3].fxc & 0x01) cel[3].fxp |= 0x40; cel[3].fxp = (cel[3].fxp >> 4) | (cel[3].fxp << 4); cel[3].fxc = 0x70; break;
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279 | case 0x01: if(cel[3].fxp & 0x08) cel[3].fxp = (cel[3].fxp & 0x07) << 4; cel[3].fxc = 0xA0; break;
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280 | case 0x04: cel[3].fxc = 0xC0; break;
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281 | case 0x05: cel[3].fxc = 0xB0; break;
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282 | case 0x06: cel[3].fxc = 0xD0; break;
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283 | case 0x07: cel[3].fxc = 0xF0; break;
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284 | case 0x08: cel[3].fxc = 0xE7; break;
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285 | case 0x09: cel[3].fxc = 0xE9; break;
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286 | case 0x0A: cel[3].fxc = (cel[3].fxp & 0x08) ? 0xEA : 0xEB; cel[3].fxp &= 0x07; break;
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287 | case 0x0B: cel[3].fxc = (cel[3].fxp & 0x10) ? 0xED : 0xEC; cel[3].fxp &= 0x0F; break;
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288 | case 0x0C: cel[3].fxc = 0xEE; break;
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289 | }
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290 |
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291 | // Apply generic effect parameter memory
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292 | uint8_t ch;
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293 | cel_t *p_cel = cel;
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294 | fxm_t *p_fxm = fxm;
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295 | for(ch = 0; ch != 4; ch++) {
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296 | uint8_t fx = p_cel->fxc;
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297 | if(fx == 0x10 || fx == 0x20 || fx == 0xE1 || fx == 0xE2 || fx == 0x50 || fx == 0x60 || fx == 0xA0) {
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298 | if(p_cel->fxp) {
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299 | p_fxm->param = p_cel->fxp;
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300 | } else {
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301 | p_cel->fxp = p_fxm->param;
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302 | }
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303 | }
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304 | p_cel++; p_fxm++;
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305 | }
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306 | }
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307 |
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308 | // Resets playback
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309 | static void playroutine_reset() {
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310 | memset(fxm, 0, sizeof(fxm));
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311 | tick = 0;
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312 | ix_row = 0;
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313 | ix_order = 0;
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314 | ix_nextrow = 0xFF;
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315 | ix_nextorder = 0xFF;
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316 | row_delay = 0;
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317 | speed = 6;
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318 | decrunch_row();
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319 | }
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320 |
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321 | // Start grinding samples
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322 | void SquawkSynth::play() {
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323 | TIMSK1 = 1 << OCIE1A; // Enable interrupt
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324 | }
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325 |
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326 | // Load a melody stream and start grinding samples
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327 | void SquawkSynth::play(SquawkStream *melody) {
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328 | uint8_t n;
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329 | pause();
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330 | stream = melody;
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331 | stream->seek(0);
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332 | n = stream->read();
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333 | if(n == 'S') {
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334 | // Squawk SD file
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335 | stream->seek(4);
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336 | stream_base = stream->read() << 8;
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337 | stream_base |= stream->read();
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338 | stream_base += 6;
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339 | } else {
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340 | // Squawk ROM array
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341 | stream_base = 1;
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342 | }
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343 | stream->seek(stream_base);
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344 | order_count = stream->read();
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345 | if(order_count <= 64) {
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346 | stream_base += order_count + 1;
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347 | for(n = 0; n < order_count; n++) order[n] = stream->read();
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348 | playroutine_reset();
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349 | play();
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350 | } else {
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351 | order_count = 0;
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352 | }
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353 | }
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354 |
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355 | // Load a melody in PROGMEM and start grinding samples
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356 | void SquawkSynth::play(const uint8_t *melody) {
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357 | pause();
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358 | rom = StreamROM(melody);
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359 | play(&rom);
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360 | }
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361 |
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362 | // Pause playback
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363 | void SquawkSynth::pause() {
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364 | TIMSK1 = 0; // Disable interrupt
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365 | }
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366 |
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367 | // Stop playing, unload melody
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368 | void SquawkSynth::stop() {
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369 | pause();
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370 | order_count = 0; // Unload melody
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371 | }
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372 |
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373 | // Progress module by one tick
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374 | void squawk_playroutine() {
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375 | static bool lockout = false;
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376 |
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377 | if(!order_count) return;
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378 |
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379 | // Protect from re-entry via ISR
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380 | cli();
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381 | if(lockout) {
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382 | sei();
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383 | return;
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384 | }
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385 | lockout = true;
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386 | sei();
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387 |
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388 | // Handle row delay
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389 | if(row_delay) {
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390 | if(tick == 0) row_delay--;
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391 | // Advance tick
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392 | if(++tick == speed) tick = 0;
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393 | } else {
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394 |
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395 | // Quick pointer access
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396 | fxm_t *p_fxm = fxm;
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397 | osc_t *p_osc = osc;
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398 | cel_t *p_cel = cel;
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399 |
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400 | // Temps
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401 | uint8_t ch, fx, fxp;
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402 | bool pattern_jump = false;
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403 | uint8_t ix_period;
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404 |
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405 | for(ch = 0; ch != 4; ch++) {
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406 | uint8_t temp;
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407 |
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408 | // Local register copy
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409 | fx = p_cel->fxc;
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410 | fxp = p_cel->fxp;
|
---|
411 | ix_period = p_cel->ixp;
|
---|
412 |
|
---|
413 | // If first tick
|
---|
414 | if(tick == (fx == 0xED ? fxp : 0)) {
|
---|
415 |
|
---|
416 | // Reset volume
|
---|
417 | if(ix_period & 0x80) p_osc->vol = p_fxm->volume = 0x20;
|
---|
418 |
|
---|
419 | if((ix_period & 0x7F) != 0x7F) {
|
---|
420 |
|
---|
421 | // Reset oscillators (unless continous flag set)
|
---|
422 | if((p_fxm->vibr.mode & 0x4) == 0x0) p_fxm->vibr.offset = 0;
|
---|
423 | if((p_fxm->trem.mode & 0x4) == 0x0) p_fxm->trem.offset = 0;
|
---|
424 |
|
---|
425 | // Cell has note
|
---|
426 | if(fx == 0x30 || fx == 0x50) {
|
---|
427 |
|
---|
428 | // Tone-portamento effect setup
|
---|
429 | p_fxm->port_target = pgm_read_word(&period_tbl[ix_period & 0x7F]);
|
---|
430 | } else {
|
---|
431 |
|
---|
432 | // Set required effect memory parameters
|
---|
433 | p_fxm->period = pgm_read_word(&period_tbl[ix_period & 0x7F]);
|
---|
434 |
|
---|
435 | // Start note
|
---|
436 | if(ch != 3) p_osc->freq = FREQ(p_fxm->period);
|
---|
437 |
|
---|
438 | }
|
---|
439 | }
|
---|
440 |
|
---|
441 | // Effects processed when tick = 0
|
---|
442 | switch(fx) {
|
---|
443 | case 0x30: // Portamento
|
---|
444 | if(fxp) p_fxm->port_speed = fxp;
|
---|
445 | break;
|
---|
446 | case 0xB0: // Jump to pattern
|
---|
447 | ix_nextorder = (fxp >= order_count ? 0x00 : fxp);
|
---|
448 | ix_nextrow = 0;
|
---|
449 | pattern_jump = true;
|
---|
450 | break;
|
---|
451 | case 0xC0: // Set volume
|
---|
452 | p_osc->vol = p_fxm->volume = MIN(fxp, 0x20);
|
---|
453 | break;
|
---|
454 | case 0xD0: // Jump to row
|
---|
455 | if(!pattern_jump) ix_nextorder = ((ix_order + 1) >= order_count ? 0x00 : ix_order + 1);
|
---|
456 | pattern_jump = true;
|
---|
457 | ix_nextrow = (fxp > 63 ? 0 : fxp);
|
---|
458 | break;
|
---|
459 | case 0xF0: // Set speed, BPM(CIA) not supported
|
---|
460 | if(fxp <= 0x20) speed = fxp;
|
---|
461 | break;
|
---|
462 | case 0x40: // Vibrato
|
---|
463 | if(fxp) p_fxm->vibr.fxp = fxp;
|
---|
464 | break;
|
---|
465 | case 0x70: // Tremolo
|
---|
466 | if(fxp) p_fxm->trem.fxp = fxp;
|
---|
467 | break;
|
---|
468 | case 0xE1: // Fine slide up
|
---|
469 | if(ch != 3) {
|
---|
470 | p_fxm->period = MAX(p_fxm->period - fxp, PERIOD_MIN);
|
---|
471 | p_osc->freq = FREQ(p_fxm->period);
|
---|
472 | }
|
---|
473 | break;
|
---|
474 | case 0xE2: // Fine slide down
|
---|
475 | if(ch != 3) {
|
---|
476 | p_fxm->period = MIN(p_fxm->period + fxp, PERIOD_MAX);
|
---|
477 | p_osc->freq = FREQ(p_fxm->period);
|
---|
478 | }
|
---|
479 | break;
|
---|
480 | case 0xE3: // Glissando control
|
---|
481 | p_fxm->glissando = (fxp != 0);
|
---|
482 | break;
|
---|
483 | case 0xE4: // Set vibrato waveform
|
---|
484 | p_fxm->vibr.mode = fxp;
|
---|
485 | break;
|
---|
486 | case 0xE7: // Set tremolo waveform
|
---|
487 | p_fxm->trem.mode = fxp;
|
---|
488 | break;
|
---|
489 | case 0xEA: // Fine volume slide up
|
---|
490 | p_osc->vol = p_fxm->volume = MIN(p_fxm->volume + fxp, 0x20);
|
---|
491 | break;
|
---|
492 | case 0xEB: // Fine volume slide down
|
---|
493 | p_osc->vol = p_fxm->volume = MAX(p_fxm->volume - fxp, 0);
|
---|
494 | break;
|
---|
495 | case 0xEE: // Delay
|
---|
496 | row_delay = fxp;
|
---|
497 | break;
|
---|
498 | }
|
---|
499 | } else {
|
---|
500 |
|
---|
501 | // Effects processed when tick > 0
|
---|
502 | switch(fx) {
|
---|
503 | case 0x10: // Slide up
|
---|
504 | if(ch != 3) {
|
---|
505 | p_fxm->period = MAX(p_fxm->period - fxp, PERIOD_MIN);
|
---|
506 | p_osc->freq = FREQ(p_fxm->period);
|
---|
507 | }
|
---|
508 | break;
|
---|
509 | case 0x20: // Slide down
|
---|
510 | if(ch != 3) {
|
---|
511 | p_fxm->period = MIN(p_fxm->period + fxp, PERIOD_MAX);
|
---|
512 | p_osc->freq = FREQ(p_fxm->period);
|
---|
513 | }
|
---|
514 | break;
|
---|
515 | /*
|
---|
516 | // Just feels... ugly
|
---|
517 | case 0xE9: // Retrigger note
|
---|
518 | temp = tick; while(temp >= fxp) temp -= fxp;
|
---|
519 | if(!temp) {
|
---|
520 | if(ch == 3) {
|
---|
521 | p_osc->freq = p_osc->phase = 0x2000;
|
---|
522 | } else {
|
---|
523 | p_osc->phase = 0;
|
---|
524 | }
|
---|
525 | }
|
---|
526 | break;
|
---|
527 | */
|
---|
528 | case 0xEC: // Note cut
|
---|
529 | if(fxp == tick) p_osc->vol = 0x00;
|
---|
530 | break;
|
---|
531 | default: // Multi-effect processing
|
---|
532 |
|
---|
533 | // Portamento
|
---|
534 | if(ch != 3 && (fx == 0x30 || fx == 0x50)) {
|
---|
535 | if(p_fxm->period < p_fxm->port_target) p_fxm->period = MIN(p_fxm->period + p_fxm->port_speed, p_fxm->port_target);
|
---|
536 | else p_fxm->period = MAX(p_fxm->period - p_fxm->port_speed, p_fxm->port_target);
|
---|
537 | if(p_fxm->glissando) p_osc->freq = FREQ(glissando(ch));
|
---|
538 | else p_osc->freq = FREQ(p_fxm->period);
|
---|
539 | }
|
---|
540 |
|
---|
541 | // Volume slide
|
---|
542 | if(fx == 0x50 || fx == 0x60 || fx == 0xA0) {
|
---|
543 | if((fxp & 0xF0) == 0) p_fxm->volume -= (LO4(fxp));
|
---|
544 | if((fxp & 0x0F) == 0) p_fxm->volume += (HI4(fxp));
|
---|
545 | p_osc->vol = p_fxm->volume = MAX(MIN(p_fxm->volume, 0x20), 0);
|
---|
546 | }
|
---|
547 | }
|
---|
548 | }
|
---|
549 |
|
---|
550 | // Normal play and arpeggio
|
---|
551 | if(fx == 0x00) {
|
---|
552 | if(ch != 3) {
|
---|
553 | temp = tick; while(temp > 2) temp -= 2;
|
---|
554 | if(temp == 0) {
|
---|
555 |
|
---|
556 | // Reset
|
---|
557 | p_osc->freq = FREQ(p_fxm->period);
|
---|
558 | } else if(fxp) {
|
---|
559 |
|
---|
560 | // Arpeggio
|
---|
561 | p_osc->freq = FREQ(arpeggio(ch, (temp == 1 ? HI4(fxp) : LO4(fxp))));
|
---|
562 | }
|
---|
563 | }
|
---|
564 | } else if(fx == 0x40 || fx == 0x60) {
|
---|
565 |
|
---|
566 | // Vibrato
|
---|
567 | if(ch != 3) p_osc->freq = FREQ((p_fxm->period + do_osc(&p_fxm->vibr)));
|
---|
568 | } else if(fx == 0x70) {
|
---|
569 | int8_t trem = p_fxm->volume + do_osc(&p_fxm->trem);
|
---|
570 | p_osc->vol = MAX(MIN(trem, 0x20), 0);
|
---|
571 | }
|
---|
572 |
|
---|
573 | // Next channel
|
---|
574 | p_fxm++; p_cel++; p_osc++;
|
---|
575 | }
|
---|
576 |
|
---|
577 | // Advance tick
|
---|
578 | if(++tick == speed) tick = 0;
|
---|
579 |
|
---|
580 | // Advance playback
|
---|
581 | if(tick == 0) {
|
---|
582 | if(++ix_row == 64) {
|
---|
583 | ix_row = 0;
|
---|
584 | if(++ix_order >= order_count) ix_order = 0;
|
---|
585 | }
|
---|
586 | // Forced order/row
|
---|
587 | if( ix_nextorder != 0xFF ) {
|
---|
588 | ix_order = ix_nextorder;
|
---|
589 | ix_nextorder = 0xFF;
|
---|
590 | }
|
---|
591 | if( ix_nextrow != 0xFF ) {
|
---|
592 | ix_row = ix_nextrow;
|
---|
593 | ix_nextrow = 0xFF;
|
---|
594 | }
|
---|
595 | decrunch_row();
|
---|
596 | }
|
---|
597 |
|
---|
598 | }
|
---|
599 |
|
---|
600 | lockout = false;
|
---|
601 | }
|
---|