hello
i’m studing fft and this code
/*
modified by varind in 2013
this code is public domain, enjoy!
*/
#include <LiquidCrystal.h>
#include <fix_fft.h>
#include <Servo.h>
#define LCHAN 5
#define RCHAN 4
const int channels = 2;
const int xres = 16;
const int yres = 8;
const int gain = 3;
//int decayrate = 2; // larger number is longer decay
int decaytest = 1;
char im[64], data[64];
char Rim[64], Rdata[64];
char data_avgs[32];
float peaks[32];
int i = 0,val,Rval;
int x = 0, y=0, z=0;
LiquidCrystal lcd(2, 3, 4, 7, 8, 12); //saves 5 pwm pins for servos, leds, etc
Servo servo1, servo2, servo3, servo4;
int startpos = 90;
int calibrate = 0; //locks servos at startpos (lowest value)
int pos1 = startpos, pos2 = startpos, pos3 = startpos, pos4 = startpos;
int servomap, servomap2;
// VU METER CHARACTERS
byte v1[8] = {
B00000,B00000,B00000,B00000,B00000,B00000,B00000,B11111};
byte v2[8] = {
B00000,B00000,B00000,B00000,B00000,B00000,B11111,B11111};
byte v3[8] = {
B00000,B00000,B00000,B00000,B00000,B11111,B11111,B11111};
byte v4[8] = {
B00000,B00000,B00000,B00000,B11111,B11111,B11111,B11111};
byte v5[8] = {
B00000,B00000,B00000,B11111,B11111,B11111,B11111,B11111};
byte v6[8] = {
B00000,B00000,B11111,B11111,B11111,B11111,B11111,B11111};
byte v7[8] = {
B00000,B11111,B11111,B11111,B11111,B11111,B11111,B11111};
byte v8[8] = {
B11111,B11111,B11111,B11111,B11111,B11111,B11111,B11111};
void setup() {
// Serial.begin(9600);
lcd.begin(16, 2);
lcd.clear();
lcd.createChar(1, v1);
lcd.createChar(2, v2);
lcd.createChar(3, v3);
lcd.createChar(4, v4);
lcd.createChar(5, v5);
lcd.createChar(6, v6);
lcd.createChar(7, v7);
lcd.createChar(8, v8);
//analogReference(DEFAULT);
// servo1.attach(5);
// servo2.attach(6);
// servo3.attach(9);
// servo4.attach(10);
// servo1.write(pos1);
// servo2.write(pos2);
// servo3.write(pos3);
// servo4.write(pos4);
}
void loop() {
// delay(10);
for (i=0; i < 64; i++){
val = ((analogRead(LCHAN) / 4 ) - 128); // chose how to interpret the data from analog in
data[i] = val;
im[i] = 0;
if (channels ==2){
Rval = ((analogRead(RCHAN) / 4 ) - 128); // chose how to interpret the data from analog in
Rdata[i] = Rval;
Rim[i] = 0;
}
};
fix_fft(data,im,6,0); // Send the data through fft
if (channels == 2){
fix_fft(Rdata,Rim,6,0); // Send the data through fft
}
// get the absolute value of the values in the array, so we're only dealing with positive numbers
for (i=0; i< 32 ;i++){
data[i] = sqrt(data[i] * data[i] + im[i] * im[i]);
}
if (channels ==2){
for (i=16; i< 32 ;i++){
data[i] = sqrt(Rdata[i-16] * Rdata[i-16] + Rim[i-16] * Rim[i-16]);
}
}
// todo: average as many or as little dynamically based on yres
for (i=0; i<32; i++) {
data_avgs[i] = (data[i]);// + data[i*2+1]);// + data[i*3 + 2]);// + data[i*4 + 3]); // add 3 samples to be averaged, use 4 when yres < 16
data_avgs[i] = constrain(data_avgs[i],0,9-gain); //data samples * range (0-9) = 9
data_avgs[i] = map(data_avgs[i], 0, 9-gain, 0, yres); // remap averaged values
}
//servos();
decay(1);
//thirtytwoband();
//mono();
//stereo8();
stereo16();
} // end loop
void decay(int decayrate){
//// reduce the values of the last peaks by 1
if (decaytest == decayrate){
for (x=0; x < 32; x++) {
peaks[x] = peaks[x] - 1; // subtract 1 from each column peaks
decaytest = 0;
}
}
decaytest++;
}
void mono(){
for (x=0; x < xres; x++) { // repeat for each column of the display horizontal resolution
y = data_avgs[x]; // get current column value
z= peaks[x];
if (y > z){
peaks[x]=y;
}
y= peaks[x];
if (y <= 8){
lcd.setCursor(x,0); // clear first row
lcd.print(" ");
lcd.setCursor(x,1); // draw second row
if (y == 0){
lcd.print(" "); // save a glyph
}
else {
lcd.write(y);
}
}
else{
lcd.setCursor(x,0); // draw first row
if (y == 9){
lcd.write(" ");
}
else {
lcd.write(y-8); // same chars 1-8 as 9-16
}
lcd.setCursor(x,1);
lcd.write(8);
} // end display
} // end xres
}
void stereo8(){
for (x=0; x < 8; x++) {
y = data_avgs[x];
z= peaks[x];
if (y > z){
peaks[x]=y;
}
y= peaks[x];
if (y <= 8){
lcd.setCursor(x,0); // clear first row
lcd.print(" ");
lcd.setCursor(x,1); // draw second row
if (y == 0){
lcd.print(" "); // save a glyph
}
else {
lcd.write(y);
}
}
else{
lcd.setCursor(x,0); // draw first row
if (y == 9){
lcd.write(" ");
}
else {
lcd.write(y-8); // same chars 1-8 as 9-16
}
lcd.setCursor(x,1);
lcd.write(8);
}
}
for (x=16; x < 32; x++) {
y = data_avgs[x];
z= peaks[x];
if (y > z){
peaks[x]=y;
}
y= peaks[x];
if (y <= 8){
lcd.setCursor(x-8,0); // clear first row
lcd.print(" ");
lcd.setCursor(x-8,1); // draw second row
if (y == 0){
lcd.print(" "); // save a glyph
}
else {
lcd.write(y);
}
}
else{
lcd.setCursor(x-8,0); // draw first row
if (y == 9){
lcd.write(" ");
}
else {
lcd.write(y-8); // same chars 1-8 as 9-16
}
lcd.setCursor(x-8,1);
lcd.write(8);
}
}
}
void stereo16(){
for (x=0; x < 16; x++) {
y = data_avgs[x];
z= peaks[x];
if (y > z){
peaks[x]=y;
}
y= peaks[x];
if (x < xres){
lcd.setCursor(x,0); // draw first row
if (y == 0){
lcd.print(" "); // save a glyph
}
else {
lcd.write(y);
}
}
}
for (x=16; x < 32; x++) {
y = data_avgs[x];
z= peaks[x];
if (y > z){
peaks[x]=y;
}
y= peaks[x];
if (x-16 < xres){
lcd.setCursor(x-16,1); // draw second row
if (y == 0){
lcd.print(" "); // save a glyph
}
else {
lcd.write(y);
}
}
}
}
void thirtytwoband(){
for (x=0; x < 32; x++) {
y = data_avgs[x];
z= peaks[x];
if (y > z){
peaks[x]=y;
}
y= peaks[x];
if (x < 16){
lcd.setCursor(x,0); // draw second row
if (y == 0){
lcd.print(" "); // save a glyph
}
else {
lcd.write(y);
}
}
else{
lcd.setCursor(x-16,1);
if (y == 0){
lcd.print(" ");
}
else {
lcd.write(y);
}
}
}
}
void goservo(){
for (x=0; x < xres; x++) { // repeat for each column of the display horizontal resolution
y = data_avgs[x]; // get current column value
if (calibrate != 1){
servomap = map(y, 0, yres, 90, 180);
servomap2 = map(y, 0, yres, 90, 00);
if ( x== xres/8){
servo1.write(servomap);
}
if (x == xres/4){
servo2.write(servomap2);
}
if (x == xres/2){
servo3.write(servomap);
}
if (x == xres/1){
servo4.write(servomap2);
}
}
}
}
It’s an Audio-Spectrum-Analyzer.ino based on hte fix_ftt lib.
My problem :
/home/seb/Arduino/Audio-Spectrum-Analyzer.ino/Audio-Spectrum-Analyzer.ino.ino:90: undefined reference to `fix_fft(char*, char*, int, int)'
The lib is installed.
The var send into the functions are the good type (i think)?
Have you an idea to help me please?
