Alexander Hentschel / C64Synth

Synth with C64 like sounds. Played on two piezo buzzers with a PS/2 keyboard. Implemented on FRDM-KL46Z

Dependencies:   PS2 TSI beep2 mbed

C64Synth.cpp@1:9cc595290b2f, 2014-01-24 (annotated)

Committer:
alexanderh
Date:
Fri Jan 24 09:58:51 2014 +0000
Revision:
1:9cc595290b2f
Parent:
0:00eec4d97228
Child:
2:a8ec77eed4cc
Documentation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
alexanderh 0:00eec4d97228 1 /*
alexanderh 0:00eec4d97228 2 * C64Synth uses a PS/2 keyboard to play C64 arps and simple tones.
alexanderh 0:00eec4d97228 3 * Implemented on a FRDM KL46Z board
alexanderh 0:00eec4d97228 4 *
alexanderh 0:00eec4d97228 5 * The keyboard is tuned in the C scale as of right now
alexanderh 0:00eec4d97228 6 *
alexanderh 0:00eec4d97228 7 * Author: Alexander Hentschel 2014
alexanderh 0:00eec4d97228 8 */
alexanderh 0:00eec4d97228 9
alexanderh 0:00eec4d97228 10 /*
alexanderh 0:00eec4d97228 11 * TODO LIST
alexanderh 0:00eec4d97228 12 *
alexanderh 0:00eec4d97228 13 * Implemept sharp (#) notes
alexanderh 0:00eec4d97228 14 * Implement scale change
alexanderh 0:00eec4d97228 15 *
alexanderh 0:00eec4d97228 16 *
alexanderh 0:00eec4d97228 17 *
alexanderh 0:00eec4d97228 18 */
alexanderh 0:00eec4d97228 19
alexanderh 0:00eec4d97228 20
alexanderh 0:00eec4d97228 21
alexanderh 0:00eec4d97228 22
alexanderh 0:00eec4d97228 23 #include "mbed.h"
alexanderh 0:00eec4d97228 24 #include "beep2.h"
alexanderh 0:00eec4d97228 25 #include "TSISensor.h"
alexanderh 0:00eec4d97228 26 #include "PS2Keyboard.h"
alexanderh 0:00eec4d97228 27 #include "stdio.h"
alexanderh 0:00eec4d97228 28 #include "keys.h"
alexanderh 0:00eec4d97228 29
alexanderh 0:00eec4d97228 30 DigitalOut myled1(LED1);
alexanderh 0:00eec4d97228 31 DigitalOut myled2(LED2);
alexanderh 0:00eec4d97228 32
alexanderh 0:00eec4d97228 33 Beep arpBuzzer(PTA5);
alexanderh 0:00eec4d97228 34 Beep toneBuzzer(PTA12);
alexanderh 0:00eec4d97228 35 PS2Keyboard ps2kb(PTC8,PTC9);
alexanderh 0:00eec4d97228 36 TSISensor tsi;
alexanderh 0:00eec4d97228 37
alexanderh 0:00eec4d97228 38 PS2Keyboard::keyboard_event_t evt_kb;
alexanderh 0:00eec4d97228 39
alexanderh 0:00eec4d97228 40 void keyboardSynth();
alexanderh 0:00eec4d97228 41 void playArp(char chord);
alexanderh 0:00eec4d97228 42 void playNote(Beep buz,char note,float dc,float len);
alexanderh 0:00eec4d97228 43 void playContNote(char note,int oct,float dc);
alexanderh 0:00eec4d97228 44
alexanderh 0:00eec4d97228 45 void getNotes(char note, char* point);
alexanderh 0:00eec4d97228 46 float getFq(char note, bool sharp);
alexanderh 0:00eec4d97228 47
alexanderh 0:00eec4d97228 48
alexanderh 0:00eec4d97228 49 float toneDc = 0.5;
alexanderh 0:00eec4d97228 50 char lastNote;
alexanderh 0:00eec4d97228 51
alexanderh 0:00eec4d97228 52 bool arpAttack = false;
alexanderh 0:00eec4d97228 53 float arpDc = 0.5;
alexanderh 0:00eec4d97228 54 float arpSpeed = 0.02;
alexanderh 0:00eec4d97228 55 float arpTempovar = 0.1;
alexanderh 0:00eec4d97228 56 float arpSpeed2;
alexanderh 0:00eec4d97228 57 float arpTime = 0.025;
alexanderh 0:00eec4d97228 58
alexanderh 0:00eec4d97228 59 float masterscale=1;
alexanderh 0:00eec4d97228 60
alexanderh 0:00eec4d97228 61 int main()
alexanderh 0:00eec4d97228 62 {
alexanderh 0:00eec4d97228 63 printf("--Program Start--");
alexanderh 0:00eec4d97228 64 myled2 = !myled2;
alexanderh 0:00eec4d97228 65 keyboardSynth();
alexanderh 0:00eec4d97228 66 }
alexanderh 0:00eec4d97228 67
alexanderh 0:00eec4d97228 68
alexanderh 0:00eec4d97228 69 void keyboardSynth()
alexanderh 0:00eec4d97228 70 {
alexanderh 0:00eec4d97228 71 int arpOn = 0;
alexanderh 0:00eec4d97228 72 int toneOn =0;
alexanderh 0:00eec4d97228 73 char keytone = ' ';
alexanderh 0:00eec4d97228 74 char playtone = ' ';
alexanderh 0:00eec4d97228 75 char playchor = ' ';
alexanderh 0:00eec4d97228 76 char chor;
alexanderh 0:00eec4d97228 77 char test;
alexanderh 0:00eec4d97228 78 int octave;
alexanderh 0:00eec4d97228 79
alexanderh 0:00eec4d97228 80 //PS/2 keyboard test
alexanderh 0:00eec4d97228 81 while(1) {
alexanderh 0:00eec4d97228 82
alexanderh 0:00eec4d97228 83 if (ps2kb.processing(&evt_kb)) {
alexanderh 0:00eec4d97228 84
alexanderh 0:00eec4d97228 85 //DEBUG keyboard terminalprint
alexanderh 0:00eec4d97228 86 //printf("[%d]:", evt_kb.type);
alexanderh 0:00eec4d97228 87 //for (int i = 0; i < evt_kb.length; i++) {
alexanderh 0:00eec4d97228 88 // printf("%02x ", evt_kb.scancode[i]);
alexanderh 0:00eec4d97228 89 // }
alexanderh 0:00eec4d97228 90 //printf("\n");
alexanderh 0:00eec4d97228 91
alexanderh 0:00eec4d97228 92 //KEY PRESS PART
alexanderh 0:00eec4d97228 93 if (!evt_kb.type) {
alexanderh 0:00eec4d97228 94
alexanderh 0:00eec4d97228 95 switch(evt_kb.scancode[0]) {
alexanderh 0:00eec4d97228 96
alexanderh 0:00eec4d97228 97 //FUNCTION KEYS
alexanderh 0:00eec4d97228 98 case Space_key:
alexanderh 0:00eec4d97228 99 arpOn = 0;
alexanderh 0:00eec4d97228 100 toneOn = 0;
alexanderh 0:00eec4d97228 101 break;
alexanderh 0:00eec4d97228 102
alexanderh 0:00eec4d97228 103 //MULTICODE KEYS
alexanderh 0:00eec4d97228 104 case Mod_fn:
alexanderh 0:00eec4d97228 105 switch(evt_kb.scancode[1]) {
alexanderh 0:00eec4d97228 106
alexanderh 0:00eec4d97228 107 case Up_key:
alexanderh 0:00eec4d97228 108 masterscale = masterscale*2;
alexanderh 0:00eec4d97228 109 break;
alexanderh 0:00eec4d97228 110 //Tune down 1 octave
alexanderh 0:00eec4d97228 111 case Down_key:
alexanderh 0:00eec4d97228 112 masterscale = masterscale/2;
alexanderh 0:00eec4d97228 113 break;
alexanderh 0:00eec4d97228 114 //Faster arp speed
alexanderh 0:00eec4d97228 115 case Pgup_key:
alexanderh 0:00eec4d97228 116 arpTime = arpTime/1.2;
alexanderh 0:00eec4d97228 117 break;
alexanderh 0:00eec4d97228 118 //Slower arp speed
alexanderh 0:00eec4d97228 119 case Pgdown_key:
alexanderh 0:00eec4d97228 120 arpTime = arpTime*1.2;
alexanderh 0:00eec4d97228 121 break;
alexanderh 0:00eec4d97228 122 //Brighter sound
alexanderh 0:00eec4d97228 123 case Left_key:
alexanderh 0:00eec4d97228 124 toneDc = 0.98;
alexanderh 0:00eec4d97228 125 break;
alexanderh 0:00eec4d97228 126 //Square wave
alexanderh 0:00eec4d97228 127 case Right_key:
alexanderh 0:00eec4d97228 128 toneDc = 0.5;
alexanderh 0:00eec4d97228 129 break;
alexanderh 0:00eec4d97228 130 //Arp Attack
alexanderh 0:00eec4d97228 131 case End_key:
alexanderh 0:00eec4d97228 132 if (!arpAttack) {
alexanderh 0:00eec4d97228 133 arpDc = 0;
alexanderh 0:00eec4d97228 134 arpSpeed = 0.02;
alexanderh 0:00eec4d97228 135 } else {
alexanderh 0:00eec4d97228 136 arpDc = 0.5;
alexanderh 0:00eec4d97228 137 }
alexanderh 0:00eec4d97228 138 arpAttack = !arpAttack;
alexanderh 0:00eec4d97228 139 break;
alexanderh 0:00eec4d97228 140 }
alexanderh 0:00eec4d97228 141 break;
alexanderh 0:00eec4d97228 142
alexanderh 0:00eec4d97228 143 //ARPS
alexanderh 0:00eec4d97228 144 case Z_key:
alexanderh 0:00eec4d97228 145 chor = 'a';
alexanderh 0:00eec4d97228 146 break;
alexanderh 0:00eec4d97228 147 case X_key:
alexanderh 0:00eec4d97228 148 // chor = 'b'
alexanderh 0:00eec4d97228 149 //arpOn = true;
alexanderh 0:00eec4d97228 150 break;
alexanderh 0:00eec4d97228 151 case C_key:
alexanderh 0:00eec4d97228 152 chor = 'C';
alexanderh 0:00eec4d97228 153 break;
alexanderh 0:00eec4d97228 154 case V_key:
alexanderh 0:00eec4d97228 155 chor = 'd';
alexanderh 0:00eec4d97228 156 break;
alexanderh 0:00eec4d97228 157 case B_key:
alexanderh 0:00eec4d97228 158 chor = 'e';
alexanderh 0:00eec4d97228 159 break;
alexanderh 0:00eec4d97228 160 case N_key:
alexanderh 0:00eec4d97228 161 chor = 'F';
alexanderh 0:00eec4d97228 162 break;
alexanderh 0:00eec4d97228 163 case M_key:
alexanderh 0:00eec4d97228 164 chor = 'G';
alexanderh 0:00eec4d97228 165 break;
alexanderh 0:00eec4d97228 166
alexanderh 0:00eec4d97228 167 // -- TONES --
alexanderh 0:00eec4d97228 168 //ROW 1
alexanderh 0:00eec4d97228 169 case A_key:
alexanderh 0:00eec4d97228 170 keytone = 'a';
alexanderh 0:00eec4d97228 171 octave = 1;
alexanderh 0:00eec4d97228 172 break;
alexanderh 0:00eec4d97228 173 case S_key:
alexanderh 0:00eec4d97228 174 keytone = 'b';
alexanderh 0:00eec4d97228 175 octave = 1;
alexanderh 0:00eec4d97228 176 break;
alexanderh 0:00eec4d97228 177 case D_key:
alexanderh 0:00eec4d97228 178 keytone = 'c';
alexanderh 0:00eec4d97228 179 octave = 1;
alexanderh 0:00eec4d97228 180 break;
alexanderh 0:00eec4d97228 181 case F_key:
alexanderh 0:00eec4d97228 182 keytone = 'd';
alexanderh 0:00eec4d97228 183 octave = 1;
alexanderh 0:00eec4d97228 184 break;
alexanderh 0:00eec4d97228 185 case G_key:
alexanderh 0:00eec4d97228 186 keytone = 'e';
alexanderh 0:00eec4d97228 187 octave = 1;
alexanderh 0:00eec4d97228 188 break;
alexanderh 0:00eec4d97228 189 case H_key:
alexanderh 0:00eec4d97228 190 keytone = 'f';
alexanderh 0:00eec4d97228 191 octave = 1;
alexanderh 0:00eec4d97228 192 break;
alexanderh 0:00eec4d97228 193 case J_key:
alexanderh 0:00eec4d97228 194 keytone = 'g';
alexanderh 0:00eec4d97228 195 octave = 1;
alexanderh 0:00eec4d97228 196 break;
alexanderh 0:00eec4d97228 197
alexanderh 0:00eec4d97228 198 //ROW 2
alexanderh 0:00eec4d97228 199 //TODO speaker 3
alexanderh 0:00eec4d97228 200 case Q_key:
alexanderh 0:00eec4d97228 201 keytone = 'a';
alexanderh 0:00eec4d97228 202 octave = 2;
alexanderh 0:00eec4d97228 203 break;
alexanderh 0:00eec4d97228 204 case W_key:
alexanderh 0:00eec4d97228 205 keytone = 'b';
alexanderh 0:00eec4d97228 206 octave = 2;
alexanderh 0:00eec4d97228 207 break;
alexanderh 0:00eec4d97228 208 case E_key:
alexanderh 0:00eec4d97228 209 keytone = 'c';
alexanderh 0:00eec4d97228 210 octave = 2;
alexanderh 0:00eec4d97228 211 break;
alexanderh 0:00eec4d97228 212 case R_key:
alexanderh 0:00eec4d97228 213 keytone = 'd';
alexanderh 0:00eec4d97228 214 octave = 2;
alexanderh 0:00eec4d97228 215 break;
alexanderh 0:00eec4d97228 216 case T_key:
alexanderh 0:00eec4d97228 217 keytone = 'e';
alexanderh 0:00eec4d97228 218 octave = 2;
alexanderh 0:00eec4d97228 219 break;
alexanderh 0:00eec4d97228 220 case Y_key:
alexanderh 0:00eec4d97228 221 keytone = 'f';
alexanderh 0:00eec4d97228 222 octave = 2;
alexanderh 0:00eec4d97228 223 break;
alexanderh 0:00eec4d97228 224 case U_key:
alexanderh 0:00eec4d97228 225 keytone = 'g';
alexanderh 0:00eec4d97228 226 octave = 2;
alexanderh 0:00eec4d97228 227 break;
alexanderh 0:00eec4d97228 228 }
alexanderh 0:00eec4d97228 229
alexanderh 0:00eec4d97228 230 //Set the tone that should be played. Only do this if the key is not already playing
alexanderh 0:00eec4d97228 231 if(keytone != playtone) {
alexanderh 0:00eec4d97228 232 playtone = keytone;
alexanderh 0:00eec4d97228 233 toneOn++;
alexanderh 0:00eec4d97228 234 }
alexanderh 0:00eec4d97228 235
alexanderh 0:00eec4d97228 236 //Set the chord that should be played. Only do this if the key is not already playing
alexanderh 0:00eec4d97228 237 if(chor != playchor) {
alexanderh 0:00eec4d97228 238 playchor = chor;
alexanderh 0:00eec4d97228 239 arpOn++;
alexanderh 0:00eec4d97228 240 }
alexanderh 0:00eec4d97228 241
alexanderh 0:00eec4d97228 242
alexanderh 0:00eec4d97228 243 //KEY RELEASE PART
alexanderh 0:00eec4d97228 244 } else {
alexanderh 0:00eec4d97228 245 test = evt_kb.scancode[1];
alexanderh 0:00eec4d97228 246
alexanderh 0:00eec4d97228 247 //Arp key is released
alexanderh 0:00eec4d97228 248 if ( test == Z_key || /*test == S_key ||*/ test == C_key || test == V_key || test == B_key || test == N_key || test == M_key) {
alexanderh 0:00eec4d97228 249
alexanderh 0:00eec4d97228 250 //ATTACK MODE
alexanderh 0:00eec4d97228 251 if (arpAttack && arpOn == 1) {
alexanderh 0:00eec4d97228 252 arpDc = 0;
alexanderh 0:00eec4d97228 253 arpSpeed = 0.02;
alexanderh 0:00eec4d97228 254 }
alexanderh 0:00eec4d97228 255 arpOn--;
alexanderh 0:00eec4d97228 256 }
alexanderh 0:00eec4d97228 257 //Tone key is released
alexanderh 0:00eec4d97228 258 if ( test == Q_key || test == W_key || test == E_key || test == R_key || test == T_key || test == Y_key || test == U_key ||
alexanderh 0:00eec4d97228 259 test == A_key || test == S_key || test == D_key || test == F_key || test == G_key || test == H_key || test == J_key) {
alexanderh 0:00eec4d97228 260 toneOn--;
alexanderh 0:00eec4d97228 261 }
alexanderh 0:00eec4d97228 262 }
alexanderh 0:00eec4d97228 263 }
alexanderh 0:00eec4d97228 264
alexanderh 0:00eec4d97228 265 //TONE HANDLER
alexanderh 0:00eec4d97228 266 if (toneOn> 0) {
alexanderh 0:00eec4d97228 267 playContNote(playtone,octave,0.9,0.1);
alexanderh 0:00eec4d97228 268 } else {
alexanderh 0:00eec4d97228 269 keytone = ' ';
alexanderh 0:00eec4d97228 270 playtone = ' ';
alexanderh 0:00eec4d97228 271 lastNote = ' ';
alexanderh 0:00eec4d97228 272 toneBuzzer.nobeep();
alexanderh 0:00eec4d97228 273 toneOn = 0;
alexanderh 0:00eec4d97228 274 }
alexanderh 0:00eec4d97228 275
alexanderh 0:00eec4d97228 276 //CHORD/ARP HANDLER
alexanderh 0:00eec4d97228 277 if (arpOn>0) {
alexanderh 0:00eec4d97228 278 playArp(playchor);
alexanderh 0:00eec4d97228 279 } else {
alexanderh 0:00eec4d97228 280 chor = ' ';
alexanderh 0:00eec4d97228 281 playchor = ' ';
alexanderh 0:00eec4d97228 282 arpOn = 0;
alexanderh 0:00eec4d97228 283 }
alexanderh 0:00eec4d97228 284 }
alexanderh 0:00eec4d97228 285 }
alexanderh 0:00eec4d97228 286
alexanderh 0:00eec4d97228 287 /* -- PlayArp --
alexanderh 0:00eec4d97228 288 *
alexanderh 1:9cc595290b2f 289 * Plays an arpeggio of the provided chord. Arp speed can be controlled by touch slider or pgup/pgdown setting. PWM duty cycle is sweeped automatically
alexanderh 0:00eec4d97228 290 *
alexanderh 1:9cc595290b2f 291 * @param chord the chord to be played UPPER CASE is major chords, lower case is minor chords.
alexanderh 0:00eec4d97228 292 *
alexanderh 0:00eec4d97228 293 */
alexanderh 0:00eec4d97228 294 void playArp(char chord)
alexanderh 0:00eec4d97228 295 {
alexanderh 0:00eec4d97228 296 static int arpCounter;
alexanderh 0:00eec4d97228 297 static char theChord[3];
alexanderh 0:00eec4d97228 298 getNotes(chord, theChord);
alexanderh 0:00eec4d97228 299
alexanderh 0:00eec4d97228 300 //keep duty cycle between 0.03 and 0.97.
alexanderh 0:00eec4d97228 301 if((arpDc > 0.98 && arpSpeed >0)|| (arpDc < 0.02 && arpSpeed <0)) {
alexanderh 0:00eec4d97228 302 arpSpeed = arpSpeed*-1;
alexanderh 0:00eec4d97228 303 }
alexanderh 0:00eec4d97228 304
alexanderh 0:00eec4d97228 305 arpSpeed2 = tsi.readPercentage()/15;
alexanderh 0:00eec4d97228 306 //Play the correct note in the chord. Vary the duty cycle and tempo for cool C64 arp effect
alexanderh 0:00eec4d97228 307 playNote(arpBuzzer,theChord[arpCounter],arpDc,arpTime+arpTempovar*arpSpeed+arpSpeed2);
alexanderh 0:00eec4d97228 308
alexanderh 0:00eec4d97228 309 arpDc = arpDc+arpSpeed;
alexanderh 0:00eec4d97228 310
alexanderh 0:00eec4d97228 311 //Reset the notes
alexanderh 0:00eec4d97228 312 arpCounter++;
alexanderh 0:00eec4d97228 313 if (arpCounter == 3) {
alexanderh 0:00eec4d97228 314 arpCounter= 0;
alexanderh 0:00eec4d97228 315 }
alexanderh 0:00eec4d97228 316 }
alexanderh 0:00eec4d97228 317
alexanderh 0:00eec4d97228 318 /* -- PlayNote --
alexanderh 0:00eec4d97228 319 *
alexanderh 0:00eec4d97228 320 * @description: Plays a note on the provided buzzer
alexanderh 0:00eec4d97228 321 *
alexanderh 1:9cc595290b2f 322 * @param buz the buzzer to play the note on,
alexanderh 1:9cc595290b2f 323 * @param note the note to be played
alexanderh 1:9cc595290b2f 324 * @param dc the duty cycle value
alexanderh 1:9cc595290b2f 325 * @param the length of the note
alexanderh 0:00eec4d97228 326 *
alexanderh 0:00eec4d97228 327 */
alexanderh 0:00eec4d97228 328 void playNote(Beep buz, char note,float dc,float len)
alexanderh 0:00eec4d97228 329 {
alexanderh 0:00eec4d97228 330 buz.beep(getFq(note,false),len,dc);
alexanderh 0:00eec4d97228 331 myled1 = !myled1;
alexanderh 0:00eec4d97228 332 myled2 = !myled2;
alexanderh 0:00eec4d97228 333 if (note=='w') {
alexanderh 0:00eec4d97228 334 wait(0.05);
alexanderh 0:00eec4d97228 335 }
alexanderh 0:00eec4d97228 336 wait (len); //wait while the note plays.
alexanderh 0:00eec4d97228 337 }
alexanderh 0:00eec4d97228 338
alexanderh 0:00eec4d97228 339
alexanderh 0:00eec4d97228 340 /* -- PlayContNote --
alexanderh 0:00eec4d97228 341 *
alexanderh 1:9cc595290b2f 342 * Plays a continuous note on the second buzzer
alexanderh 0:00eec4d97228 343 *
alexanderh 1:9cc595290b2f 344 * @param note the note to be played
alexanderh 1:9cc595290b2f 345 * @param oct the octave
alexanderh 1:9cc595290b2f 346 @param dc the duty cycle of the note
alexanderh 0:00eec4d97228 347 */
alexanderh 0:00eec4d97228 348 void playContNote(char note,int oct,float dc)
alexanderh 0:00eec4d97228 349 {
alexanderh 0:00eec4d97228 350 static float fq;
alexanderh 0:00eec4d97228 351
alexanderh 0:00eec4d97228 352 if(lastNote != note) {
alexanderh 0:00eec4d97228 353 fq = getFq(note,false);
alexanderh 0:00eec4d97228 354 toneBuzzer.beepNoStop(fq*oct/2,toneDc);
alexanderh 0:00eec4d97228 355 myled1 = !myled1;
alexanderh 0:00eec4d97228 356 myled2 = !myled2;
alexanderh 0:00eec4d97228 357 } else {
alexanderh 0:00eec4d97228 358 toneBuzzer.changeDc(toneDc);
alexanderh 0:00eec4d97228 359 }
alexanderh 0:00eec4d97228 360
alexanderh 0:00eec4d97228 361 //wait (len); //wait while the note plays.
alexanderh 0:00eec4d97228 362 lastNote = note;
alexanderh 0:00eec4d97228 363 }
alexanderh 0:00eec4d97228 364
alexanderh 1:9cc595290b2f 365 /*
alexanderh 0:00eec4d97228 366 *
alexanderh 1:9cc595290b2f 367 * Gets the notes in a chord
alexanderh 0:00eec4d97228 368 *
alexanderh 1:9cc595290b2f 369 * @param chord the chord
alexanderh 1:9cc595290b2f 370 * @param notes the array to save the notes in
alexanderh 0:00eec4d97228 371 *
alexanderh 0:00eec4d97228 372 */
alexanderh 0:00eec4d97228 373
alexanderh 0:00eec4d97228 374 void getNotes(char chord, char* notes)
alexanderh 0:00eec4d97228 375 {
alexanderh 0:00eec4d97228 376 if (chord=='a') {
alexanderh 0:00eec4d97228 377 notes[0] = 'a';
alexanderh 0:00eec4d97228 378 notes[1] = 'c';
alexanderh 0:00eec4d97228 379 notes[2] = 'e';
alexanderh 0:00eec4d97228 380 }
alexanderh 0:00eec4d97228 381 if (chord=='C') {
alexanderh 0:00eec4d97228 382 notes[0] = 'g';
alexanderh 0:00eec4d97228 383 notes[1] = 'c';
alexanderh 0:00eec4d97228 384 notes[2] = 'e';
alexanderh 0:00eec4d97228 385 }
alexanderh 0:00eec4d97228 386 if (chord=='F') {
alexanderh 0:00eec4d97228 387 notes[0] = 'a';
alexanderh 0:00eec4d97228 388 notes[1] = 'c';
alexanderh 0:00eec4d97228 389 notes[2] = 'f';
alexanderh 0:00eec4d97228 390 }
alexanderh 0:00eec4d97228 391 if (chord=='G') {
alexanderh 0:00eec4d97228 392 notes[0] = 'g';
alexanderh 0:00eec4d97228 393 notes[1] = 'b';
alexanderh 0:00eec4d97228 394 notes[2] = 'd';
alexanderh 0:00eec4d97228 395 }
alexanderh 0:00eec4d97228 396 if (chord=='d') {
alexanderh 0:00eec4d97228 397 notes[0] = 'a';
alexanderh 0:00eec4d97228 398 notes[1] = 'd';
alexanderh 0:00eec4d97228 399 notes[2] = 'f';
alexanderh 0:00eec4d97228 400 }
alexanderh 0:00eec4d97228 401 if (chord=='e') {
alexanderh 0:00eec4d97228 402 notes[0] = 'g';
alexanderh 0:00eec4d97228 403 notes[1] = 'b';
alexanderh 0:00eec4d97228 404 notes[2] = 'e';
alexanderh 0:00eec4d97228 405 }
alexanderh 0:00eec4d97228 406 }
alexanderh 0:00eec4d97228 407
alexanderh 0:00eec4d97228 408
alexanderh 1:9cc595290b2f 409 /*
alexanderh 0:00eec4d97228 410 *
alexanderh 1:9cc595290b2f 411 * Gets the frequency of the note
alexanderh 0:00eec4d97228 412 *
alexanderh 1:9cc595290b2f 413 * @param note the note
alexanderh 0:00eec4d97228 414 *
alexanderh 1:9cc595290b2f 415 * @return the frequency as float
alexanderh 0:00eec4d97228 416 */
alexanderh 0:00eec4d97228 417 float getFq(char note, bool sharp)
alexanderh 0:00eec4d97228 418 {
alexanderh 0:00eec4d97228 419 if(!sharp ) {
alexanderh 0:00eec4d97228 420 if (note=='a') {
alexanderh 0:00eec4d97228 421 return 880*masterscale;
alexanderh 0:00eec4d97228 422 }
alexanderh 0:00eec4d97228 423 if (note=='b') {
alexanderh 0:00eec4d97228 424 return 987.76*masterscale;
alexanderh 0:00eec4d97228 425 }
alexanderh 0:00eec4d97228 426 if (note=='c') {
alexanderh 0:00eec4d97228 427 return 1046.5*masterscale;
alexanderh 0:00eec4d97228 428 }
alexanderh 0:00eec4d97228 429 if (note=='d') {
alexanderh 0:00eec4d97228 430 return 1174.66*masterscale;
alexanderh 0:00eec4d97228 431 }
alexanderh 0:00eec4d97228 432 if (note=='e') {
alexanderh 0:00eec4d97228 433 return 1318.51*masterscale;
alexanderh 0:00eec4d97228 434 }
alexanderh 0:00eec4d97228 435 if (note=='f') {
alexanderh 0:00eec4d97228 436 return 1396.91*masterscale;
alexanderh 0:00eec4d97228 437 }
alexanderh 0:00eec4d97228 438 if (note=='g') {
alexanderh 0:00eec4d97228 439 return 1567.98*masterscale;
alexanderh 0:00eec4d97228 440 }
alexanderh 0:00eec4d97228 441
alexanderh 0:00eec4d97228 442 //Sharps #
alexanderh 0:00eec4d97228 443 } else {
alexanderh 0:00eec4d97228 444 if (note=='f') {
alexanderh 0:00eec4d97228 445 return 1479.98*masterscale;
alexanderh 0:00eec4d97228 446 }
alexanderh 0:00eec4d97228 447 }
alexanderh 0:00eec4d97228 448 return 0;
alexanderh 0:00eec4d97228 449 }
alexanderh 0:00eec4d97228 450