Rufaida Ahmed / Mbed 2 deprecated Elevator

Dependencies:   PinDetect mbed Servo

ding.cpp@0:81f78497df4e, 2012-06-18 (annotated)

Committer:
Rufaida
Date:
Mon Jun 18 17:47:17 2012 +0000
Revision:
0:81f78497df4e

        

        
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/*including the libarary of the ding*/





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#include "ding.h"





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/*definitions*/





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Ticker rhythm;





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DigitalIn button(p20);





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AnalogOut piezo(p18);





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int i, done=0;





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float c;





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int sample_count;





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const signed short *pos;





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signed short Var16s;





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int Var32s;





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unsigned short Var16us;





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/*Function to start the ding sound ticker function*/





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void myrhythm (void) {





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    if (sample_count) {





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        Var16s= *pos;





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        pos++;





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        Var32s=Var16s;                       //Cast into integer





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        Var32s+=32768;                       //Add offset (32768)





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        Var16us=(unsigned short)Var32s;      //Cast into unsigned short





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        piezo.write_u16(Var16us);            //Write to Analog out





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        if (--sample_count==0)





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            new_event(ev_Timeout);





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    }





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}





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/*the ticker function*/





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void Start_up_sound (void) {





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    sample_count=0;





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    rhythm.attach_us(&myrhythm,23);





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}





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void start_ding(void) {





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    sample_count= 0x28030;              //The sample number





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    pos=ding;





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}