Abel Zatarain / Mbed 2 deprecated FMSynthCSUSM

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Dependencies:   mbed

main.cpp@3:83ac767f3a63, 2017-11-28 (annotated)

Committer:
davolfman
Date:
Tue Nov 28 23:27:34 2017 +0000
Revision:
3:83ac767f3a63
Parent:
2:5454dee210ed
Child:
4:1d2a699c95c7
sintable and fastsin for first quadrant.

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 0:b2f7400596ce 4 AnalogOut DAC0(PA_4);//Not labeled in the docs for the f401, but seems to be for all
davolfman 0:b2f7400596ce 5 AnalogOut DAC1(PA_5);
davolfman 0:b2f7400596ce 6
davolfman 0:b2f7400596ce 7 AnalogIn ADC0(PA_0);
davolfman 0:b2f7400596ce 8 AnalogIn ADC1(PA_1);
davolfman 0:b2f7400596ce 9 //AnalogIn ADC2(PA_2);//not labeled as such in MBED's docs for f401, yes 446
davolfman 0:b2f7400596ce 10 //AnalogIn ADC3(PA_3);//not labeled as such in MBED's docs for f401, yes 446
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 0:b2f7400596ce 13 AnalogIn ADC6(PA_6);
davolfman 0:b2f7400596ce 14 AnalogIn ADC7(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 0:b2f7400596ce 17 AnalogIn ADC10(PC_0);
davolfman 0:b2f7400596ce 18 AnalogIn ADC11(PC_1);
davolfman 0:b2f7400596ce 19 AnalogIn ADC12(PC_2);
davolfman 0:b2f7400596ce 20 AnalogIn ADC13(PC_3);
davolfman 0:b2f7400596ce 21 AnalogIn ADC14(PC_4);
davolfman 0:b2f7400596ce 22 AnalogIn ADC15(PC_5);
davolfman 0:b2f7400596ce 23
davolfman 2:5454dee210ed 24 BusIn keyBank(PC_10, PC_11, PC_12, PC_13, PC_14, PC_15);
davolfman 2:5454dee210ed 25 BusOut keySelect(PB_0, PB_1, PB_2, PB_3, PB_4, PB_5, PB_6, PB_7, PB_8);
davolfman 2:5454dee210ed 26 BusIn numerator(PA_8, PA_9, PA_10, PA_11);
davolfman 2:5454dee210ed 27 BusIn denominator(PA_12, PA_13, PA_14, PA_15);
davolfman 2:5454dee210ed 28
davolfman 0:b2f7400596ce 29 //Renaming ports
davolfman 0:b2f7400596ce 30 #define inVol ADC0
davolfman 0:b2f7400596ce 31 #define inModAmt ADC1
davolfman 0:b2f7400596ce 32 #define inCarA ADC6
davolfman 0:b2f7400596ce 33 #define inCarD ADC7
davolfman 0:b2f7400596ce 34 #define inCarS ADC10
davolfman 0:b2f7400596ce 35 #define inCarR ADC11
davolfman 0:b2f7400596ce 36 #define inModA ADC12
davolfman 0:b2f7400596ce 37 #define inModD ADC13
davolfman 0:b2f7400596ce 38 #define inModS ADC14
davolfman 0:b2f7400596ce 39 #define inModR ADC15
davolfman 0:b2f7400596ce 40 #define outMono DAC0
davolfman 0:b2f7400596ce 41
davolfman 2:5454dee210ed 42 #define numKeys 49
davolfman 1:f3350a372732 43 #define PI M_PI
davolfman 0:b2f7400596ce 44
davolfman 0:b2f7400596ce 45 //possible constants
davolfman 0:b2f7400596ce 46 int carrierIncrements[numKeys];
davolfman 2:5454dee210ed 47 /*
davolfman 2:5454dee210ed 48 going to build table here later.
davolfman 2:5454dee210ed 49 */
davolfman 1:f3350a372732 50 const int attackLimit = (0x1 << 16) - 1;
davolfman 1:f3350a372732 51 const int fixed2Pi = (int) ((2.0 * PI) * (0x1 << 16));
davolfman 1:f3350a372732 52
davolfman 0:b2f7400596ce 53
davolfman 0:b2f7400596ce 54 //non-constants
davolfman 1:f3350a372732 55 //Most of these will be recalculated or reset on every input cycle of the main
davolfman 1:f3350a372732 56 // loop, as appropriate
davolfman 0:b2f7400596ce 57 int FMmult;
davolfman 0:b2f7400596ce 58 int Volume;
davolfman 1:f3350a372732 59 int modVol;
davolfman 1:f3350a372732 60 int modAmpI;
davolfman 1:f3350a372732 61 int carAmpS;
davolfman 2:5454dee210ed 62 //bool keysPressed[numKeys];
davolfman 2:5454dee210ed 63 int64_t keyboard;
davolfman 0:b2f7400596ce 64 int carrierPhases[numKeys];
davolfman 0:b2f7400596ce 65 int modulatorPhases[numKeys];
davolfman 0:b2f7400596ce 66 short envelopeStatesC[numKeys];
davolfman 0:b2f7400596ce 67 short envelopeStatesM[numKeys];
davolfman 0:b2f7400596ce 68 int envelopeAmpsC[numKeys];
davolfman 1:f3350a372732 69 int envelopeAmpsM[numKeys];
davolfman 1:f3350a372732 70
davolfman 1:f3350a372732 71 int modA;
davolfman 1:f3350a372732 72 int modD;
davolfman 1:f3350a372732 73 int modS;
davolfman 1:f3350a372732 74 int modR;
davolfman 1:f3350a372732 75 int carA;
davolfman 1:f3350a372732 76 int carD;
davolfman 1:f3350a372732 77 int carS;
davolfman 1:f3350a372732 78 int carR;
davolfman 1:f3350a372732 79
davolfman 1:f3350a372732 80 int fastSin(const int phase){
davolfman 3:83ac767f3a63 81 int i = phase >> 2;
davolfman 3:83ac767f3a63 82 int sum = 0;
davolfman 3:83ac767f3a63 83 sum += (phase & 0x3) * sintable[i+1];
davolfman 3:83ac767f3a63 84 sum += (0x4 - (phase & 0x3)) * sintable[i];
davolfman 3:83ac767f3a63 85 sum = sum >> 2;
davolfman 3:83ac767f3a63 86
davolfman 3:83ac767f3a63 87 return sum;
davolfman 1:f3350a372732 88 }
davolfman 0:b2f7400596ce 89
davolfman 1:f3350a372732 90 void synthesize(){
davolfman 1:f3350a372732 91 carAmpS = 0;
davolfman 1:f3350a372732 92 for(int i = 0; i < numKeys; ++i){
davolfman 2:5454dee210ed 93 if(keyboard & (0x1 << i)){
davolfman 1:f3350a372732 94 if(envelopeStatesC[i] < 2)
davolfman 1:f3350a372732 95 envelopeStatesC[i] = 4;
davolfman 1:f3350a372732 96 if(envelopeStatesM[i] < 2)
davolfman 1:f3350a372732 97 envelopeStatesM[i] = 4;
davolfman 1:f3350a372732 98
davolfman 1:f3350a372732 99 if(envelopeStatesC[i] == 4){
davolfman 1:f3350a372732 100 envelopeAmpsC[i] += carA;
davolfman 1:f3350a372732 101 if(envelopeAmpsC[i] >= attackLimit){
davolfman 1:f3350a372732 102 envelopeAmpsC[i] = attackLimit;
davolfman 1:f3350a372732 103 envelopeStatesC[i] = 3;
davolfman 1:f3350a372732 104 }
davolfman 1:f3350a372732 105 }
davolfman 1:f3350a372732 106
davolfman 1:f3350a372732 107 if(envelopeStatesM[i] == 4){
davolfman 1:f3350a372732 108 envelopeAmpsM[i] += modA;
davolfman 1:f3350a372732 109 if(envelopeAmpsM[i] >= attackLimit){
davolfman 1:f3350a372732 110 envelopeAmpsM[i] = attackLimit;
davolfman 1:f3350a372732 111 envelopeStatesM[i] = 3;
davolfman 1:f3350a372732 112 }
davolfman 1:f3350a372732 113 }
davolfman 1:f3350a372732 114
davolfman 1:f3350a372732 115 if(envelopeStatesC[i] == 3){
davolfman 1:f3350a372732 116 envelopeAmpsC[i] += carD;
davolfman 1:f3350a372732 117 if(envelopeAmpsC[i] <= carS){
davolfman 1:f3350a372732 118 envelopeAmpsC[i] = carS;
davolfman 1:f3350a372732 119 envelopeStatesC[i] = 2;
davolfman 1:f3350a372732 120 }
davolfman 1:f3350a372732 121 }
davolfman 1:f3350a372732 122
davolfman 1:f3350a372732 123 if(envelopeStatesM[i] == 3){
davolfman 1:f3350a372732 124 envelopeAmpsM[i] += modD;
davolfman 1:f3350a372732 125 if(envelopeAmpsM[i] <= modS){
davolfman 1:f3350a372732 126 envelopeAmpsM[i] = modS;
davolfman 1:f3350a372732 127 envelopeStatesM[i] = 2;
davolfman 1:f3350a372732 128 }
davolfman 1:f3350a372732 129 }
davolfman 1:f3350a372732 130 }else{
davolfman 1:f3350a372732 131 if(envelopeStatesC[i] > 1)
davolfman 1:f3350a372732 132 envelopeStatesC[i] = 1;
davolfman 1:f3350a372732 133 if(envelopeStatesM[i] > 1)
davolfman 1:f3350a372732 134 envelopeStatesM[i] = 1;
davolfman 1:f3350a372732 135
davolfman 1:f3350a372732 136 if(envelopeStatesC[i] == 1){
davolfman 1:f3350a372732 137 if(envelopeAmpsC[i] <= 0){
davolfman 1:f3350a372732 138 envelopeStatesC[i] = 0;
davolfman 1:f3350a372732 139 envelopeAmpsC[i] = 0;
davolfman 1:f3350a372732 140 }else{
davolfman 1:f3350a372732 141 envelopeAmpsC[i] -= carR;
davolfman 1:f3350a372732 142 }
davolfman 1:f3350a372732 143 }
davolfman 1:f3350a372732 144 if(envelopeStatesM[i] == 1){
davolfman 1:f3350a372732 145 if(envelopeAmpsM[i] <= 0){
davolfman 1:f3350a372732 146 envelopeStatesM[i] = 0;
davolfman 1:f3350a372732 147 envelopeAmpsM[i] = 0;
davolfman 1:f3350a372732 148 }else{
davolfman 1:f3350a372732 149 envelopeAmpsM[i] -= modR;
davolfman 1:f3350a372732 150 }
davolfman 1:f3350a372732 151 }
davolfman 1:f3350a372732 152 }
davolfman 1:f3350a372732 153
davolfman 1:f3350a372732 154 if(envelopeAmpsC[i] > 0){
davolfman 1:f3350a372732 155 modulatorPhases[i] += (Fmult * carrierIncrements[i]) >> 16;
davolfman 1:f3350a372732 156 modAmpI = fastSin((((modulatorPhases[i] * envelopeAmpsM[i]) >> 16)
davolfman 1:f3350a372732 157 * modVol) >> 16);
davolfman 1:f3350a372732 158 carrierPhases[i] += ((carrierIncrements[i] + modAmpI) * fixed2pi) >> 16;
davolfman 1:f3350a372732 159 carAmps += (fastSin(carrierPhases[i]) * envelopeAmpsC[i]) >> 16;
davolfman 1:f3350a372732 160 }
davolfman 1:f3350a372732 161 }
davolfman 1:f3350a372732 162 outMono.write_u16(((carAmps / numKeys) * Volume) >> 16);
davolfman 1:f3350a372732 163 }
davolfman 0:b2f7400596ce 164
davolfman 0:b2f7400596ce 165
davolfman 0:b2f7400596ce 166 int main() {
davolfman 2:5454dee210ed 167 int ratNumer;
davolfman 2:5454dee210ed 168 int ratDenom;
davolfman 2:5454dee210ed 169
davolfman 2:5454dee210ed 170 while(true){
davolfman 2:5454dee210ed 171 ratNumer = 0xf & ~ numerator;
davolfman 2:5454dee210ed 172 ratDenom = 0xf & ~ denom;
davolfman 2:5454dee210ed 173 FMult = (ratNumer << 16) / ratDenom;
davolfman 2:5454dee210ed 174
davolfman 2:5454dee210ed 175 Volume = (int)inVol.read_u16();
davolfman 2:5454dee210ed 176 modVol = (int)inModAmt.read_u16();
davolfman 2:5454dee210ed 177
davolfman 2:5454dee210ed 178 carA = 0xffff / ((int)inCarA.read_u16());
davolfman 2:5454dee210ed 179 carD = 0xffff / ((int)inCarD.read_u16());
davolfman 2:5454dee210ed 180 carS = (int)inCarS.read_u16();
davolfman 2:5454dee210ed 181 carR = 0xffff / ((int)inCarR.read_u16());
davolfman 2:5454dee210ed 182
davolfman 2:5454dee210ed 183 modA = 0xffff / ((int)inModA.read_u16());
davolfman 2:5454dee210ed 184 modD = 0xffff / ((int)inModD.read_u16());
davolfman 2:5454dee210ed 185 modS = (int)inModS.read_u16();
davolfman 2:5454dee210ed 186 modR = 0xffff / ((int)inModR.read_u16());
davolfman 2:5454dee210ed 187
davolfman 2:5454dee210ed 188
davolfman 2:5454dee210ed 189 }
davolfman 0:b2f7400596ce 190 }