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A coding example for digital signal processing, specifically focusing on the aic23 codec and the generation of sine waves. The example includes various tables for sine values and global variables for buffer storage.
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sine_table[15]={ 0,406.7366,743.1448,951.0565,994.5219,866.0254,587.7853,207.9117,-207.9117,- 587.7853,-866.0254,-994.5219,-951.0565,-743.1448,406.7366} ;//sine values short sine_table1[14]={ 0,433.8837,781.8315,974.9279,974.9279,781.8315,433.8837,0.0000,-433.8837,- 781.8315,-974.9279,-974.9279,-781.8315,-433.8837}; short sine_table1[12]={0,0.5000,0.8660,1.0000,0.8660,0.5000,0.0000,-0.5000,-0.8660,-1.0000,- 0.8660,-0.5000}; short sine_table1[12]={0,0.5000,0.8660,1.0000,0.8660,0.5000,0.0000,-0.5000,-0.8660,-1.0000,- 0.8660,-0.5000}; short sine_table1[10]={0,587.7853,951.0565,951.0565,587.7853,0.0000,-587.7853,-951.0565,- 951.0565,-587.7853}; short sine_table1[9]={0,642.7876,984.8078,866.0254,342.0201,-342.0201,-866.0254,-984.8078,- 642.7876};
Global Variables Global Variables short gBuffer[BUFFSIZE]; short aaa[BUFFSIZE]; short gBuffer1[BUFFSIZE]; short gBuffer2[BUFFSIZE]; short gBuffer3[BUFFSIZE]; short gBuffer4[BUFFSIZE]; short aaa1[BUFFSIZE]; short aaa2[BUFFSIZE];
DSK6416_LED_init(); //init LED from BSL DSK6416_DIP_init(); //init DIP from BSL while (1) //infinite loop { for (i=0; i< BUFFSIZE; i++) { if (DSK6416_DIP_get(0)==0) //=0 if DIP switch #0 pressed { DSK6416_LED_on(0);//turn LED #0 ON for (loop=0; loop <= 14; loop++) { output_left_sample(sine_table[loop]gain);//output sine values gBuffer[i+loop]=(sine_table[loop]gain); } if (loop == 15) i=i+loop-1, loop = 0 ; //check for end of table } else DSK6416_LED_off(0); } for (j=0; j< BUFFSIZE; j++) { if (DSK6416_DIP_get(1)==0) { for (loop1=0; loop1 <= 13; loop1++) { output_right_sample(sine_table1[loop1]gain);//output sine values gBuffer1[j+loop1]=(sine_table1[loop1]gain); } if (loop1 == 14) j=j+loop1-1, loop1 = 0 ; //check for end of table } else DSK6416_LED_off(1); } for (j=0; j< BUFFSIZE; j++)
#include "dsk6416_aic23.h" Uint32 fs = DSK6416_AIC23_FREQ_8KHZ; void notdof ( float a); void notre ( float a); void notmi ( float a); void notpha ( float a); void notson ( float a); void notla ( float a); void notsi ( float a); void notdos ( float a); void tre ( int a); short A = 5; short dof[18]={0, 339, 637, 861, 982, 988, 876, 661, 368, 31, -309, -613, - 844, -976, -992, -891, -685, -397}; short re[16]={0, 378, 700, 918, 1000, 933, 727, 413, 38, -343, -673, -903, - 998, -946, -752, -447}; short mi[15]={0, 400, 733, 944, 997, 884, 623, 258, -150, -533, -827, -983, - 975, -803, -498}; short pha[13]={0, 445, 797, 982, 963, 742, 367, -86, -520, -846, -995, -936, -682}; short son[12]={0, 495, 861, 1000, 876, 522, 31, -468, -844, -999, -891, - 549}; short la[11]={0, 522, 890, 997, 811, 386, -152, -645, -949, -974, -713}; short si[10]={0, 578, 943, 962, 628, 63, -525, -920, -977, -675}; short dos[9]={0, 637, 982, 876, 368, -309, -844, -992, -685}; short outdof[]; short outre[]; short outmi[]; short outpha[]; short outson[]; short outla[]; short outsi[]; short outdos[]; void main () { c6416_dsk_init(); DSK6416_LED_init(); //init LED from BSL DSK6416_DIP_init(); //init DIP from BSL while (1) { notdof(0.4); notre(0.4); notmi(0.4); notdof(0.4); tre(1000); notdof(0.4); notre(0.4); notmi(0.4);
notdof(0.4); tre(1000); notmi(0.7); notpha(1); notson(1); tre(1000); notmi(0.7); notpha(1); notson(1); tre(1000); notson(1); notla(1); notson(1); notpha(0.7); notmi(1); notdof(0.4); tre(1000); notson(1); notla(1); notson(1); notpha(0.7); notmi(1); notdof(0.4); tre(1000); notdof(0.5); notson(1); notdos(1); notdof(0.5); notson(1); notdos(1); tre(1000); } } void tre ( int a) { int i; for (i=1;i<=a;i++) { output_sample(0); } } void notdof ( float a)// a la gia tri tinh bang giay (s); { unsigned int b,i,k; b=a440; for (i=1;i<=b;i++) { for (k=0;k<=17;k++) { outdof[k]= dof[k]A;
output_sample(outson[k]); } } } void notla ( float a) { unsigned int b,i,k; b=a699; for (i=1;i<=b;i++) { for (k=0;k<=10;k++) { outla[k]= la[k]A; output_sample(outla[k]); } } } void notsi ( float a) { unsigned int b,i,k; b=a784; for (i=1;i<=b;i++) { for (k=0;k<=9;k++) { outsi[k]= si[k]A; output_sample(outsi[k]); } } } void notdos ( float a) { unsigned int b,i,k; b=a880; for (i=1;i<=b;i++) { for (k=0;k<=8;k++) { outdos[k]= dos[k]A; output_sample(outdos[k]); } } } C2: #include "dsk6416_aic23.h" Uint32 fs = DSK6416_AIC23_FREQ_8KHZ; void notdof ( float a);
void notre ( float a); void notmi ( float a); void notpha ( float a); void notson ( float a); void notla ( float a); void notsi ( float a); void notdos ( float a); void notsonf ( float a); void tre ( int a); short A = 5; short dof[18]={0, 339, 637, 861, 982, 988, 876, 661, 368, 31, -309, -613, - 844, -976, -992, -891, -685, -397}; short re[16]={0, 378, 700, 918, 1000, 933, 727, 413, 38, -343, -673, -903, - 998, -946, -752, -447}; short mi[15]={0, 400, 733, 944, 997, 884, 623, 258, -150, -533, -827, -983, - 975, -803, -498}; short pha[13]={0, 445, 797, 982, 963, 742, 367, -86, -520, -846, -995, -936, -682}; short son[12]={0, 495, 861, 1000, 876, 522, 31, -468, -844, -999, -891, - 549}; short la[11]={0, 522, 890, 997, 811, 386, -152, -645, -949, -974, -713}; short si[10]={0, 578, 943, 962, 628, 63, -525, -920, -977, -675}; short dos[9]={0, 637, 982, 876, 368, -309, -844, -992, -685}; short sonf[125]={ 0,50,100,150,200,249,297,345,391, ,482,525,567,608,647,685,720,754,786, ,844,870,894,915,934,951,965,977,987, ,998,1000,999,996,990,982,972,959,943, ,905,882,858,831,802,771,738,703,666, ,588,546,504,460,414,368,321,273,224, ,125,75,25,-25,-75,-125,-175,-224,-273,- ,-368,-414,-460,-504,-546,-588,-628,-666,-703,- ,-771,-802,-831,-858,-882,-905,-925,-943,-959,- ,-982,-990,-996,-999,-1000,-998,-994,-987,-977,- ,-951,-934,-915,-894,-870,-844,-816,-786,-754,- ,-685,-647,-608,-567,-525,-482,-437,-391,-345,- ,-249,-200,-150,-100,- }; short outdof[]; short outre[]; short outmi[]; short outpha[]; short outson[]; short outla[]; short outsi[]; short outdos[]; short outsonf[]; void main () {
output_sample(0); } } void notdof ( float a)// a la gia tri tinh bang giay (s); { unsigned int b,i,k; b=a262; for (i=1;i<=b;i++) { for (k=0;k<=17;k++) { outdof[k]= dof[k]A; output_sample(outdof[k]); } } } void notre ( float a) { unsigned int b,i,k; b=a294; for (i=1;i<=b;i++) { for (k=0;k<=15;k++) { outre[k]= re[k]A; output_sample(outre[k]); } } } void notmi ( float a) { unsigned int b,i,k; b=a330; for (i=1;i<=b;i++) { for (k=0;k<=14;k++) { outmi[k]= mi[k]A; output_sample(outmi[k]); } } } void notpha ( float a) { unsigned int b,i,k; b=a*350; for (i=1;i<=b;i++) { for (k=0;k<=12;k++) {
outpha[k]= pha[k]A; output_sample(outpha[k]); } } } void notson ( float a) { unsigned int b,i,k; b=a392; for (i=1;i<=b;i++) { for (k=0;k<=11;k++) { outson[k]= son[k]A; output_sample(outson[k]); } } } void notla ( float a) { unsigned int b,i,k; b=a440; for (i=1;i<=b;i++) { for (k=0;k<=10;k++) { outla[k]= la[k]A; output_sample(outla[k]); } } } void notsi ( float a) { unsigned int b,i,k; b=a494; for (i=1;i<=b;i++) { for (k=0;k<=9;k++) { outsi[k]= si[k]A; output_sample(outsi[k]); } } } void notdos ( float a) { unsigned int b,i,k; b=a523; for (i=1;i<=b;i++) { for (k=0;k<=8;k++) { outdos[k]= dos[k]*A;