Giuseppe Pota
A guitar Tuner project made by: Guarino Yuri Pota Giuseppe Sito Leonardo It is made up of a circuit of signal amplification(using LM386 OP-AMP), and a circuit of many LEDs that display if the guitar is tuned or not.
main.cpp
- Committer:
- gpota
- Date:
- 2018-12-09
- Revision:
- 1:45d485b8966f
- Parent:
- 0:2529b7b37e9a
File content as of revision 1:45d485b8966f:
#include "mbed.h"
#include "mbed.h"
#include "arm_math.h"
#include "arm_const_structs.h"
#define SAMP_FREQ 2000
InterruptIn button(PC_13);
DigitalOut El(D2);
DigitalOut A(D3);
DigitalOut D(D4);
DigitalOut G(D5);
DigitalOut B(D6);
DigitalOut Eh(D7);
DigitalOut Led_Ok(D9);
DigitalOut Led_Down(D10);
DigitalOut Led_Up(D8);
Serial pc (SERIAL_TX,SERIAL_RX);
AnalogIn analog_value(A0);
const int FFT_LEN = 1024;
const int bins = 1000;
float Ing[FFT_LEN];
const static arm_cfft_instance_f32 *S;
float samples[FFT_LEN*2];
float magnitudes[FFT_LEN];
float freq_window[bins];
int c =0;
void selectNote() {
c++;
if(c==1)
{
El=1;
A=0;
D=0;
G=0;
B=0;
Eh=0;
}
else if(c==2)
{
El=0;
A=1;
D=0;
G=0;
B=0;
Eh=0;
}
else if(c==3)
{
El=0;
A=0;
D=1;
G=0;
B=0;
Eh=0;
}
else if(c==4)
{
El=0;
A=0;
D=0;
G=1;
B=0;
Eh=0;
}
else if(c==5)
{
El=0;
A=0;
D=0;
G=0;
B=1;
Eh=0;
}
else if(c==6)
{
El=0;
A=0;
D=0;
G=0;
B=0;
Eh=1;
}
else if(c==7)
c=0;
}
int main() {
El=0;
A=0;
D=0;
G=0;
B=0;
Eh=0;
El=1;wait(0.1);El=0;
A=1;wait(0.1);A=0;
D=1;wait(0.1);D=0;
G=1;wait(0.1);G=0;
B=1;wait(0.1);B=0;
Eh=1;wait(0.1);Eh=0;
El=1;A=1;D=1;G=1;B=1;Eh=1;wait(0.2);
El=0;A=0;D=0;G=0;B=0;Eh=0;
Led_Down=1;
Led_Up=0;
Led_Ok=0;
int32_t i = 0;
pc.printf("\r\n\r\nFFT test program!\r\n");
// Init arm_ccft_32
switch (FFT_LEN)
{
case 16:
S = & arm_cfft_sR_f32_len16;
break;
case 32:
S = & arm_cfft_sR_f32_len32;
break;
case 64:
S = & arm_cfft_sR_f32_len64;
break;
case 128:
S = & arm_cfft_sR_f32_len128;
break;
case 256:
S = & arm_cfft_sR_f32_len256;
break;
case 512:
S = & arm_cfft_sR_f32_len512;
break;
case 1024:
S = & arm_cfft_sR_f32_len1024;
break;
case 2048:
S = & arm_cfft_sR_f32_len2048;
break;
case 4096:
S = & arm_cfft_sR_f32_len4096;
break;
}
while(1) {
button.rise(&selectNote);
for (int k = 0; k < 1024; k++) {
Ing[k] = (short) (analog_value.read_u16() - 0x8000);
wait_us(1e6/SAMP_FREQ);
}
//Riempiamo il vettore per la FFT
for(i = 0; i< FFT_LEN*2; i+=2)
{
samples[i] = Ing[i];
samples[i+1] = 0;
}
arm_cfft_f32(S, samples, 0, 1);
// Calcola la FFT
arm_cmplx_mag_f32(samples, magnitudes, FFT_LEN);
if(c==1){
int max=3;
int j=2;
do{
if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<100)&&(j*1000/1024>30))//restringo la banda a [30Hz, 100Hz]
max=j;
j++;
}while(j<1024/2);
float maxx=(float)max*1000/1024;
if(maxx<82){
Led_Down=1;
Led_Up=0;
Led_Ok=0;
}
if(maxx>84){
Led_Down=0;
Led_Up=1;
Led_Ok=0;
}
else if(maxx>82.3 &&maxx<=84){
Led_Down=0;
Led_Up=0;
Led_Ok=1;
}
}
//--------------A STRING------------------
if(c==2){
int max=3;
int j=2;
do{
if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<130)&&(j*1000/1024>90))//restringo la banda a [90Hz, 130Hz]
max=j;
j++;
}while(j<1024/2);
float maxx=(float)max*1000/1024;
//pc.printf("Il massimo in ampiezza è alla frequenza %f Hertz \n",(float)max*1000/1024);
if(maxx<110){
Led_Down=1;
Led_Up=0;
Led_Ok=0;
}
if(maxx>112){
Led_Down=0;
Led_Up=1;
Led_Ok=0;
}
else if(maxx>110 &&maxx<113){
Led_Down=0;
Led_Up=0;
Led_Ok=1;
}
}
//--------------D STRING------------------
if(c==3){
int max=3;
int j=2;
do{
if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<160)&&(j*1000/1024>130))//restringo la banda a [130Hz, 160Hz]
max=j;
j++;
}while(j<1024/2);
float maxx=(float)max*1000/1024;
//pc.printf("Il massimo in ampiezza è alla frequenza %f Hertz \n",(float)max*1000/1024);
if(maxx<147){
Led_Down=1;
Led_Up=0;
Led_Ok=0;
}
if(maxx>149){
Led_Down=0;
Led_Up=1;
Led_Ok=0;
}
else if(maxx>147 &&maxx<149){
Led_Down=0;
Led_Up=0;
Led_Ok=1;
}
}
//--------------G STRING------------------
if(c==4){
int max=3;
int j=2;
do{
if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<210)&&(j*1000/1024>170))//restringo la banda a [170Hz, 210Hz]
max=j;
j++;
}while(j<1024/2);
float maxx=(float)max*1000/1024;
//pc.printf("Il massimo in ampiezza è alla frequenza %f Hertz \n",(float)max*1000/1024);
if(maxx<196){
Led_Down=1;
Led_Up=0;
Led_Ok=0;
}
if(maxx>203){
Led_Down=0;
Led_Up=1;
Led_Ok=0;
}
else if(maxx>=196 &&maxx<=197.5){
Led_Down=0;
Led_Up=0;
Led_Ok=1;
}
}
//--------------B STRING------------------
if(c==5){
int max=3;
int j=2;
do{
if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<260)&&(j*1000/1024>230))//restringo la banda a [230Hz, 260Hz]
max=j;
j++;
}while(j<1024/2);
float maxx=(float)max*1000/1024;
//pc.printf("Il massimo in ampiezza è alla frequenza %f Hertz \n",(float)max*1000/1024);
if(maxx<244){
Led_Down=1;
Led_Up=0;
Led_Ok=0;
}
if(maxx>250){
Led_Down=0;
Led_Up=1;
Led_Ok=0;
}
else if(maxx>246 &&maxx<250){
Led_Down=0;
Led_Up=0;
Led_Ok=1;
}
}
//--------------Eh STRING------------------
if(c==6){
int max=3;
int j=2;
do{
if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<340)&&(j*1000/1024>310))//restringo la banda a [340Hz, 310Hz]
max=j;
j++;
}while(j<1024/2);
float maxx=(float)max*1000/1024;
//pc.printf("Il massimo in ampiezza è alla frequenza %f Hertz \n",(float)max*1000/1024);
if(maxx<327){
Led_Down=1;
Led_Up=0;
Led_Ok=0;
}
if(maxx>334){
Led_Down=0;
Led_Up=1;
Led_Ok=0;
}
else if(maxx>330.3 &&maxx<333.5){
Led_Down=0;
Led_Up=0;
Led_Ok=1;
}
}
}
}