Abel Zatarain / Mbed 2 deprecated FMSynthCSUSM

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Dependencies:   mbed

main.cpp@9:86c0035f5321, 2017-12-07 (annotated)

Committer:
davolfman
Date:
Thu Dec 07 19:18:51 2017 +0000
Revision:
9:86c0035f5321
Parent:
8:13b0594510de
Child:
10:59c829586a4f
Synthesis compiling, not yet checked or fixed

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davolfman 0:b2f7400596ce 1 #include "mbed.h"
davolfman 3:83ac767f3a63 2 #include "sintable.h"
davolfman 0:b2f7400596ce 3
davolfman 9:86c0035f5321 4 AnalogOut outMono(PA_4);//Not labeled in the docs for the f401, but seems to be for all
davolfman 7:b0cd74923bc6 5 //AnalogOut DAC1(PA_5);
davolfman 0:b2f7400596ce 6
davolfman 9:86c0035f5321 7 AnalogIn inVol(PA_0);
davolfman 7:b0cd74923bc6 8 AnalogIn inModAmt(PA_1);
davolfman 6:9f8c8c3c111d 9 //AnalogIn ADC2(PA_2);//these are the uart pins!!
davolfman 6:9f8c8c3c111d 10 //AnalogIn ADC3(PA_3);//these are the uart pins!!
davolfman 0:b2f7400596ce 11 //AnalogIn ADC4(PA_4);//we're using these for output
davolfman 0:b2f7400596ce 12 //AnalogIn ADC5(PA_5);//we're using these for output
davolfman 9:86c0035f5321 13 AnalogIn inCarA(PA_6);
davolfman 9:86c0035f5321 14 AnalogIn inCarD(PA_7);
davolfman 0:b2f7400596ce 15 //AnalogIn ADC8(PB_0);//lets leave the 2 we aren't using in a single port
davolfman 0:b2f7400596ce 16 //AnalogIn ADC9(PB_1);//that way we know there's not ADCs on one of them
davolfman 9:86c0035f5321 17 AnalogIn inCarS(PC_0);
davolfman 9:86c0035f5321 18 AnalogIn inCarR(PC_1);
davolfman 9:86c0035f5321 19 AnalogIn inModA(PC_2);
davolfman 9:86c0035f5321 20 AnalogIn inModD(PC_3);
davolfman 9:86c0035f5321 21 AnalogIn inModS(PC_4);
davolfman 9:86c0035f5321 22 AnalogIn inModR(PC_5);
davolfman 0:b2f7400596ce 23
lenzi002 8:13b0594510de 24 //BusIn keyBank(PC_10, PC_11, PC_12, PC_13, PD_2, PH_1); old
lenzi002 8:13b0594510de 25 BusIn keyBank(PH_1, PD_2, PC_13, PC_12, PC_11, PC_10);
davolfman 7:b0cd74923bc6 26 BusOut bankSelect(PB_0, PB_1, PB_2, PB_3, PB_4, PB_5, PB_6, PB_7, PB_8);
davolfman 2:5454dee210ed 27 BusIn numerator(PA_8, PA_9, PA_10, PA_11);
davolfman 2:5454dee210ed 28 BusIn denominator(PA_12, PA_13, PA_14, PA_15);
davolfman 2:5454dee210ed 29
lenzi002 8:13b0594510de 30 Serial pc(USBTX, USBRX);
lenzi002 8:13b0594510de 31
davolfman 9:86c0035f5321 32 Ticker synthesisClock;
davolfman 0:b2f7400596ce 33
davolfman 2:5454dee210ed 34 #define numKeys 49
davolfman 0:b2f7400596ce 35
davolfman 4:1d2a699c95c7 36 //constants
davolfman 4:1d2a699c95c7 37 const int carrierIncrements[] = {107, 113, 120, 127, 135, 143, 151, 160, 170,
davolfman 4:1d2a699c95c7 38 180, 190, 202, 214, 227, 240, 254, 270, 286, 303, 321, 340, 360, 381, 404,
davolfman 4:1d2a699c95c7 39 428, 454, 481, 509, 540, 572, 606, 642, 680, 720, 763, 809, 857, 908, 962,
davolfman 4:1d2a699c95c7 40 1019, 1080, 1144, 1212, 1284, 1360, 1441, 1527, 1618, 1714};
davolfman 1:f3350a372732 41 const int attackLimit = (0x1 << 16) - 1;
davolfman 7:b0cd74923bc6 42 #define U_PI 3.14159265358979f
davolfman 9:86c0035f5321 43 const int fixed2pi = (2.0 * U_PI) * (0x1 << 16l);
davolfman 1:f3350a372732 44
davolfman 0:b2f7400596ce 45 //non-constants
davolfman 1:f3350a372732 46 //Most of these will be recalculated or reset on every input cycle of the main
davolfman 1:f3350a372732 47 // loop, as appropriate
davolfman 0:b2f7400596ce 48 int FMmult;
davolfman 0:b2f7400596ce 49 int Volume;
davolfman 1:f3350a372732 50 int modVol;
davolfman 1:f3350a372732 51 int modAmpI;
davolfman 1:f3350a372732 52 int carAmpS;
davolfman 2:5454dee210ed 53 int64_t keyboard;
davolfman 0:b2f7400596ce 54 int carrierPhases[numKeys];
davolfman 0:b2f7400596ce 55 int modulatorPhases[numKeys];
davolfman 0:b2f7400596ce 56 short envelopeStatesC[numKeys];
davolfman 0:b2f7400596ce 57 short envelopeStatesM[numKeys];
davolfman 0:b2f7400596ce 58 int envelopeAmpsC[numKeys];
davolfman 1:f3350a372732 59 int envelopeAmpsM[numKeys];
davolfman 1:f3350a372732 60
davolfman 1:f3350a372732 61 int modA;
davolfman 1:f3350a372732 62 int modD;
davolfman 1:f3350a372732 63 int modS;
davolfman 1:f3350a372732 64 int modR;
davolfman 1:f3350a372732 65 int carA;
davolfman 1:f3350a372732 66 int carD;
davolfman 1:f3350a372732 67 int carS;
davolfman 1:f3350a372732 68 int carR;
davolfman 1:f3350a372732 69
davolfman 1:f3350a372732 70 int fastSin(const int phase){
davolfman 5:ac5c4bd3ef4b 71 int index = (phase & 0x3ffc) >> 2;
davolfman 5:ac5c4bd3ef4b 72 int subindex = phase & 0x3;
davolfman 5:ac5c4bd3ef4b 73 int quadrant = (phase & 0xc000) >> 14;
davolfman 3:83ac767f3a63 74 int sum = 0;
davolfman 5:ac5c4bd3ef4b 75 switch (quadrant) {
davolfman 5:ac5c4bd3ef4b 76 case 0:
davolfman 7:b0cd74923bc6 77 sum += (4 - subindex) * sinTable[index];
davolfman 7:b0cd74923bc6 78 sum += subindex * sinTable[index+1];
davolfman 5:ac5c4bd3ef4b 79 break;
davolfman 5:ac5c4bd3ef4b 80 case 1:
davolfman 7:b0cd74923bc6 81 sum += (4 - subindex) * sinTable[1+4095-index];
davolfman 7:b0cd74923bc6 82 sum += subindex * sinTable[4095-index];
davolfman 5:ac5c4bd3ef4b 83 break;
davolfman 5:ac5c4bd3ef4b 84 case 2:
davolfman 7:b0cd74923bc6 85 sum -= (4 - subindex) * sinTable[index];
davolfman 7:b0cd74923bc6 86 sum -= subindex * sinTable[index+1];
davolfman 5:ac5c4bd3ef4b 87 break;
davolfman 5:ac5c4bd3ef4b 88 case 3:
davolfman 7:b0cd74923bc6 89 sum -= (4 - subindex) * sinTable[1+4095-index];
davolfman 7:b0cd74923bc6 90 sum -= subindex * sinTable[4095-index];
davolfman 5:ac5c4bd3ef4b 91 break;
davolfman 5:ac5c4bd3ef4b 92 }
davolfman 3:83ac767f3a63 93 sum = sum >> 2;
davolfman 3:83ac767f3a63 94
davolfman 3:83ac767f3a63 95 return sum;
davolfman 1:f3350a372732 96 }
davolfman 0:b2f7400596ce 97
davolfman 1:f3350a372732 98 void synthesize(){
davolfman 1:f3350a372732 99 carAmpS = 0;
davolfman 1:f3350a372732 100 for(int i = 0; i < numKeys; ++i){
davolfman 2:5454dee210ed 101 if(keyboard & (0x1 << i)){
davolfman 1:f3350a372732 102 if(envelopeStatesC[i] < 2)
davolfman 1:f3350a372732 103 envelopeStatesC[i] = 4;
davolfman 1:f3350a372732 104 if(envelopeStatesM[i] < 2)
davolfman 1:f3350a372732 105 envelopeStatesM[i] = 4;
davolfman 1:f3350a372732 106
davolfman 1:f3350a372732 107 if(envelopeStatesC[i] == 4){
davolfman 1:f3350a372732 108 envelopeAmpsC[i] += carA;
davolfman 1:f3350a372732 109 if(envelopeAmpsC[i] >= attackLimit){
davolfman 1:f3350a372732 110 envelopeAmpsC[i] = attackLimit;
davolfman 1:f3350a372732 111 envelopeStatesC[i] = 3;
davolfman 1:f3350a372732 112 }
davolfman 1:f3350a372732 113 }
davolfman 1:f3350a372732 114
davolfman 1:f3350a372732 115 if(envelopeStatesM[i] == 4){
davolfman 1:f3350a372732 116 envelopeAmpsM[i] += modA;
davolfman 1:f3350a372732 117 if(envelopeAmpsM[i] >= attackLimit){
davolfman 1:f3350a372732 118 envelopeAmpsM[i] = attackLimit;
davolfman 1:f3350a372732 119 envelopeStatesM[i] = 3;
davolfman 1:f3350a372732 120 }
davolfman 1:f3350a372732 121 }
davolfman 1:f3350a372732 122
davolfman 1:f3350a372732 123 if(envelopeStatesC[i] == 3){
davolfman 1:f3350a372732 124 envelopeAmpsC[i] += carD;
davolfman 1:f3350a372732 125 if(envelopeAmpsC[i] <= carS){
davolfman 1:f3350a372732 126 envelopeAmpsC[i] = carS;
davolfman 1:f3350a372732 127 envelopeStatesC[i] = 2;
davolfman 1:f3350a372732 128 }
davolfman 1:f3350a372732 129 }
davolfman 1:f3350a372732 130
davolfman 1:f3350a372732 131 if(envelopeStatesM[i] == 3){
davolfman 1:f3350a372732 132 envelopeAmpsM[i] += modD;
davolfman 1:f3350a372732 133 if(envelopeAmpsM[i] <= modS){
davolfman 1:f3350a372732 134 envelopeAmpsM[i] = modS;
davolfman 1:f3350a372732 135 envelopeStatesM[i] = 2;
davolfman 1:f3350a372732 136 }
davolfman 1:f3350a372732 137 }
davolfman 1:f3350a372732 138 }else{
davolfman 1:f3350a372732 139 if(envelopeStatesC[i] > 1)
davolfman 1:f3350a372732 140 envelopeStatesC[i] = 1;
davolfman 1:f3350a372732 141 if(envelopeStatesM[i] > 1)
davolfman 1:f3350a372732 142 envelopeStatesM[i] = 1;
davolfman 1:f3350a372732 143
davolfman 1:f3350a372732 144 if(envelopeStatesC[i] == 1){
davolfman 1:f3350a372732 145 if(envelopeAmpsC[i] <= 0){
davolfman 1:f3350a372732 146 envelopeStatesC[i] = 0;
davolfman 1:f3350a372732 147 envelopeAmpsC[i] = 0;
davolfman 1:f3350a372732 148 }else{
davolfman 1:f3350a372732 149 envelopeAmpsC[i] -= carR;
davolfman 1:f3350a372732 150 }
davolfman 1:f3350a372732 151 }
davolfman 1:f3350a372732 152 if(envelopeStatesM[i] == 1){
davolfman 1:f3350a372732 153 if(envelopeAmpsM[i] <= 0){
davolfman 1:f3350a372732 154 envelopeStatesM[i] = 0;
davolfman 1:f3350a372732 155 envelopeAmpsM[i] = 0;
davolfman 1:f3350a372732 156 }else{
davolfman 1:f3350a372732 157 envelopeAmpsM[i] -= modR;
davolfman 1:f3350a372732 158 }
davolfman 1:f3350a372732 159 }
davolfman 1:f3350a372732 160 }
davolfman 1:f3350a372732 161
davolfman 1:f3350a372732 162 if(envelopeAmpsC[i] > 0){
davolfman 7:b0cd74923bc6 163 modulatorPhases[i] += (FMmult * carrierIncrements[i]) >> 16;
davolfman 1:f3350a372732 164 modAmpI = fastSin((((modulatorPhases[i] * envelopeAmpsM[i]) >> 16)
davolfman 1:f3350a372732 165 * modVol) >> 16);
davolfman 1:f3350a372732 166 carrierPhases[i] += ((carrierIncrements[i] + modAmpI) * fixed2pi) >> 16;
davolfman 7:b0cd74923bc6 167 carAmpS += (fastSin(carrierPhases[i]) * envelopeAmpsC[i]) >> 16;
davolfman 1:f3350a372732 168 }
davolfman 1:f3350a372732 169 }
davolfman 7:b0cd74923bc6 170 outMono.write_u16(((carAmpS / numKeys) * Volume) >> 16);
davolfman 1:f3350a372732 171 }
davolfman 0:b2f7400596ce 172
davolfman 0:b2f7400596ce 173
davolfman 0:b2f7400596ce 174 int main() {
davolfman 2:5454dee210ed 175 int ratNumer;
davolfman 2:5454dee210ed 176 int ratDenom;
davolfman 2:5454dee210ed 177
davolfman 9:86c0035f5321 178 int64_t keytemp = 0;
davolfman 9:86c0035f5321 179
davolfman 9:86c0035f5321 180 FMmult = 1;
davolfman 9:86c0035f5321 181 Volume = 0;
davolfman 9:86c0035f5321 182 modVol = 0;
davolfman 9:86c0035f5321 183 modAmpI = 0;
davolfman 9:86c0035f5321 184 carAmpS = 0;
davolfman 9:86c0035f5321 185 keyboard = 0ll;
davolfman 9:86c0035f5321 186 for(int i = 0; i < numKeys; ++i){
davolfman 9:86c0035f5321 187 carrierPhases[i] = 0;
davolfman 9:86c0035f5321 188 modulatorPhases[i] = 0;
davolfman 9:86c0035f5321 189 envelopeStatesC[i] = 0;
davolfman 9:86c0035f5321 190 envelopeStatesM[i] = 0;
davolfman 9:86c0035f5321 191 envelopeAmpsC[i] = 0;
davolfman 9:86c0035f5321 192 envelopeAmpsM[i] = 0;
davolfman 9:86c0035f5321 193 }
davolfman 9:86c0035f5321 194 modA = 0;
davolfman 9:86c0035f5321 195 modD = 0;
davolfman 9:86c0035f5321 196 modS = 0;
davolfman 9:86c0035f5321 197 modR = 0;
davolfman 9:86c0035f5321 198 carA = 0;
davolfman 9:86c0035f5321 199 carD = 0;
davolfman 9:86c0035f5321 200 carS = 0;
davolfman 9:86c0035f5321 201 carR = 0;
davolfman 9:86c0035f5321 202
lenzi002 8:13b0594510de 203 keyBank.mode(PullNone);
davolfman 9:86c0035f5321 204 synthesisClock.attach(synthesize, 0.000025);
lenzi002 8:13b0594510de 205
davolfman 2:5454dee210ed 206 while(true){
davolfman 2:5454dee210ed 207 ratNumer = 0xf & ~ numerator;
davolfman 7:b0cd74923bc6 208 ratDenom = 0xf & ~ denominator;
davolfman 7:b0cd74923bc6 209 FMmult = (ratNumer << 16) / ratDenom;
davolfman 2:5454dee210ed 210
davolfman 2:5454dee210ed 211 Volume = (int)inVol.read_u16();
davolfman 2:5454dee210ed 212 modVol = (int)inModAmt.read_u16();
davolfman 2:5454dee210ed 213
davolfman 9:86c0035f5321 214 if(! inCarA.read_u16())
davolfman 9:86c0035f5321 215 carA = 0xffff;
davolfman 9:86c0035f5321 216 else
davolfman 9:86c0035f5321 217 carA = 0xffff / ((int)inCarA.read_u16());
davolfman 9:86c0035f5321 218
davolfman 9:86c0035f5321 219 if(! inCarD.read_u16())
davolfman 9:86c0035f5321 220 carD = 0xffff;
davolfman 9:86c0035f5321 221 else
davolfman 9:86c0035f5321 222 carD = 0xffff / ((int)inCarD.read_u16());
davolfman 9:86c0035f5321 223
davolfman 2:5454dee210ed 224 carS = (int)inCarS.read_u16();
davolfman 9:86c0035f5321 225
davolfman 9:86c0035f5321 226 if(! inCarR.read_u16())
davolfman 9:86c0035f5321 227 carR = 0xffff;
davolfman 9:86c0035f5321 228 else
davolfman 9:86c0035f5321 229 carR = 0xffff / ((int)inCarR.read_u16());
davolfman 2:5454dee210ed 230
davolfman 9:86c0035f5321 231 if(! inModA.read_u16())
davolfman 9:86c0035f5321 232 modA = 0xffff;
davolfman 9:86c0035f5321 233 else
davolfman 9:86c0035f5321 234 modA = 0xffff / ((int)inModA.read_u16());
davolfman 9:86c0035f5321 235
davolfman 9:86c0035f5321 236 if(! inModD.read_u16())
davolfman 9:86c0035f5321 237 modD = 0xffff;
davolfman 9:86c0035f5321 238 else
davolfman 9:86c0035f5321 239 modD = 0xffff / ((int)inModD.read_u16());
davolfman 9:86c0035f5321 240
davolfman 2:5454dee210ed 241 modS = (int)inModS.read_u16();
davolfman 9:86c0035f5321 242
davolfman 9:86c0035f5321 243 if(! inModR.read_u16())
davolfman 9:86c0035f5321 244 modR = 0xffff;
davolfman 9:86c0035f5321 245 else
davolfman 9:86c0035f5321 246 modR = 0xffff / ((int)inModR.read_u16());
davolfman 2:5454dee210ed 247
davolfman 7:b0cd74923bc6 248 //THIS IS CORRECT (1 means the key is connected)
davolfman 7:b0cd74923bc6 249 // B8 B7 B6 B5 B4 B3 B2 B1 B0
davolfman 7:b0cd74923bc6 250 // |----||----||----||----||----||----||----||----||
davolfman 7:b0cd74923bc6 251 //0000000000000001111111111111111111111111111111111111111111111111
davolfman 7:b0cd74923bc6 252 //
davolfman 7:b0cd74923bc6 253 //THIS IS NOT CORRECT (1 means the key is connected)
davolfman 7:b0cd74923bc6 254 // B8 B7 B6 B5 B4 B3 B2 B1 B0
davolfman 7:b0cd74923bc6 255 // |----||----||----||----||----||----||----||----||----|
davolfman 9:86c0035f5321 256 //0000000000111111111111111111111111111111111111111111111111100000
davolfman 9:86c0035f5321 257 //Thus, we need to subtract 5 from our shift
davolfman 9:86c0035f5321 258 keytemp = 0; //zero the keys before we start ORing on top of everything
davolfman 9:86c0035f5321 259 for(int i = 0; i < 9; ++i) {
lenzi002 8:13b0594510de 260 bankSelect = (~(1LL << i)) & (unsigned long long)bankSelect.mask();
lenzi002 8:13b0594510de 261 wait_us(200);
lenzi002 8:13b0594510de 262 int shiftOffset = 6LL * i;
davolfman 9:86c0035f5321 263
davolfman 7:b0cd74923bc6 264
davolfman 9:86c0035f5321 265 keytemp |= ((~(unsigned long long)keyBank) & (unsigned long long)keyBank.mask()) << (unsigned long long)shiftOffset;
davolfman 7:b0cd74923bc6 266 }
davolfman 9:86c0035f5321 267 keytemp >>= 5;
davolfman 9:86c0035f5321 268
davolfman 9:86c0035f5321 269 keyboard = keytemp;
davolfman 9:86c0035f5321 270 wait_ms(5);
davolfman 2:5454dee210ed 271 }
davolfman 0:b2f7400596ce 272 }