Yasushi TAUCHI / Mbed 2 deprecated Sound_PWM_2

PWMによる音だし(疑似Sin波)

Dependencies:   mbed

main.cpp@1:e1919d5190b3, 2011-12-29 (annotated)

Committer:
yueee_yt
Date:
Thu Dec 29 06:06:16 2011 +0000
Revision:
1:e1919d5190b3
Parent:
0:5a95bead7a47 

        

        
Who changed what in which revision?

        

            
                
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yueee_yt

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#define mC 261.626





yueee_yt

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#define mD 293.665





yueee_yt

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#define mE 329.628





yueee_yt

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#define mF 349.228





yueee_yt

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#define mG 391.995





yueee_yt

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#define mA 440.000





yueee_yt

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#define mB 493.883





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yueee_yt

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#include "mbed.h"





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yueee_yt

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Ticker timer;





yueee_yt

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PwmOut sp1(p25);





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float ms[180];





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float m1;





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void sound_out(void) {





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    static float j=0;





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    j=j+m1;





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    if (j>180)j=j-180;





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    sp1.write(ms[(int)j]);





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}





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int main() {





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    float mm[]={mC,mD,mE,mF,mG,mA,mB,mC*2};





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    int i;





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    for (i=0; i<180; i++) {





yueee_yt

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        ms[i]=sin(2*3.1415*(float)i/180.0)/2.0+0.5;





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    }





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    sp1.period_us(10);





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    timer.attach_us(&sound_out,100);





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    for (i=0; i<sizeof(mm); i++) {





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        m1=mm[i]*180/10000;





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        wait(0.5f);





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    }





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    sp1.write(0.0f);





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    while (1);





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}