Lee Nam Cheol / Mbed OS lab03-pwm-music

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main.cpp

Committer:
namcheol
Date:
2020-04-21
Revision:
1:45d0e3e16b3a
Parent:
0:f31836d48420

File content as of revision 1:45d0e3e16b3a:

#include "mbed.h"
#include "pitches.h"

PwmOut buzzer(PTA1);   //buzzer = PTA1
int length = 56;
float frequency[] = {NOTE_E6, NOTE_DS6, NOTE_E6, NOTE_DS6, NOTE_E6, NOTE_B5, NOTE_D6, NOTE_C6, NOTE_A5,
                        NOTE_C5, NOTE_E5, NOTE_A5, NOTE_B5,
                        NOTE_E5, NOTE_GS5, NOTE_B5, NOTE_C6,
                        NOTE_E6, NOTE_DS6, NOTE_E6, NOTE_DS6, NOTE_E6, NOTE_B5, NOTE_D6,NOTE_C6, NOTE_A5,
                        NOTE_C5, NOTE_E5, NOTE_A5, NOTE_B5,
                        NOTE_E5, NOTE_GS5, NOTE_B5, NOTE_C6,
                        NOTE_B5, NOTE_C6, NOTE_D6, NOTE_E6,
                        NOTE_G5, NOTE_F6, NOTE_E6, NOTE_D6,
                        NOTE_F5, NOTE_E6, NOTE_D6, NOTE_C6,
                        NOTE_E5, NOTE_D6, NOTE_C6, NOTE_B5,
                        NOTE_E5, NOTE_E6};
float beat[] = {12,12,12,12,12,12,12,12,9,
                12,12,12,9,
                12,12,12,9,
                12,12,12,12,12,12,12,12,9,
                12,12,12,9,
                12,12,12,9,
                12,12,12,9,
                12,12,12,9,
                12,12,12,9,
                12,12,12,9,
                12,9};


int main()
{
    while(true) {
        for(int i = 0; i <= length; i++) {
            if(frequency[i] == 0)
                buzzer = 0.0;
            else {
                buzzer.period(1.0 / frequency[i]);  //period = (1.0 / frequency)
                buzzer = 0.5;       //duty cycle = 50%
            }
            thread_sleep_for(3500.0 / beat[i]); //duration = (C / beat)ms
        }
    }
}