File content as of revision 0:569d2e559397:

/*
Zasto ljudi cudno cuju?
    -Filip Stevanovic

Da bi smo bili bolji predatori, evolucija je coveku razvila veoma osetljiva cula.
Da bi se to ostvarilo, mozak signale sa cula logaritmuje, i tako se promene
na veoma malim nivoima jasno uocavaju dok se promene na velikim nivoima skoro uopste
ne primecuju.

Hvala na paznji
*/

#include "mbed.h"

//Constants
#define DebouncePeriod 100    //Period that a button needs to stabilise in miliseconds. 100 should be okay
#define ArbitraryWaitPeriod 1 //Aritrary pooling waiting periods, its should be the in the scale of tens of miliseconds to max 100

//Constants for frequency spectrum function
const int n = 5000;
const int k = -4950;

//Pins
#define A PA_10
#define B PA_9
#define C PA_8
#define D PB_10
#define E PB_5
#define F PB_4
#define G PB_3
#define SEL1 PB_6
#define SEL2 PC_7
#define SW1 PC_9
#define POT1 PA_0
#define POT2 PA_1
#define BUZZ PA_11
#define LD2 PB_15

//Pin/Object declaration
PwmOut buzzer (BUZZ);
DigitalOut led2 (LD2);
InterruptIn sw1 (SW1);
AnalogIn pot1 (POT1);
AnalogIn pot2 (POT2);
BusOut display (A,B,C,D,E,F,G);
BusOut select (SEL2,SEL1);

//Timer declaration
Timer t;

//Global variable for updating the display when SW1 is pressed
int value = 0;

//ISR for Switch1 (Fall)
void ISR_sw1(){
    //If the button recently fell, dont do the ISR again (Debounce)
    //If it didnt, do it and save the new time when you did it
    if(t.read_ms()> DebouncePeriod){
        value = pot1 * 100;
        led2 = !led2;
        t.reset();
    }
}

//Show digit on display
void SegDisp (int num){
    switch(num){
        case 0:display = 0b1000000;break;   
        case 1:display = 0b1111001;break;   
        case 2:display = 0b0100100;break;   
        case 3:display = 0b0110000;break;   
        case 4:display = 0b0011001;break;   
        case 5:display = 0b0010010;break;   
        case 6:display = 0b0000010;break;   
        case 7:display = 0b1111000;break;   
        case 8:display = 0b0000000;break;   
        case 9:display = 0b0010000;break;   
        default:display = 0x7f;    break;
    
    }
}

//Convert number to digits and show on display
void PrintDisp(int num){
    int j = num%10,d = num/10;
    if(d==0)
        SegDisp(-1);
    else
        SegDisp(d);
    select = 0b01;
    wait_ms(ArbitraryWaitPeriod);
    SegDisp(j);
    select = 0b10;
    wait_ms(ArbitraryWaitPeriod);
}

//Main
int main(){
    //Starting timer
    t.start();
    //Binding ISR to fall for Switch1
    sw1.fall(&ISR_sw1);
    
    //Main Loop
    while(1){
        //Pooling Pot1 i Pot2
        buzzer=pot1*0.5f; //Arbitrarno deljenje sa 2 jer je apsolutno isto da li je duty 0.25 ili 0.75
        buzzer.period_us(k*pot2+n); //Linearise  frequency from 20Hz to 20kHz 
        
        //Print Pot1 to Display
        PrintDisp(value); //It never gets to 1 so it wont get to 100 thus its limited to 99
        
        //Pooling time is integrated in PrintDisp function
    }
}