Yasushi TAUCHI / Mbed 2 deprecated Sound_PWM_2

PWMによる音だし(疑似Sin波)

Dependencies:   mbed

main.cpp

Committer:
yueee_yt
Date:
2011-12-26
Revision:
0:5a95bead7a47
Child:
1:e1919d5190b3

File content as of revision 0:5a95bead7a47:

#define mC 261.626
#define mD 293.665
#define mE 329.628
#define mF 349.228
#define mG 391.995
#define mA 440.000
#define mB 493.883

#include "mbed.h"

Ticker timer;
PwmOut sp1(p25);
float ms[180];
float m1;

void sound_out(void) {
    static float j=0; 
    j=j+m1;
    if(j>180)j=j-180;
    sp1.write(ms[(int)j]);
}

int main() {
    float mm[]={mC,mD,mE,mF,mG,mA,mB,mC*2};
    int i;
    for (i=0;i<180;i++) {
        ms[i]=sin(2*3.1415*(float)i/180.0)/2.0+0.5;
    }

    sp1.period_us(10); 

    for (i=0;i<sizeof(mm);i++) {
        m1=mm[i]*180/10000;
        timer.attach_us(&sound_out,100);
        wait(0.5f);
    }
    sp1.write(0.0f);
    while (1);
}