buzzer.h

00001 
00002 #include "mbed.h"
00003 DigitalOut gnd(PTA4)
00004 gnd = 0;
00005 PwmOut
00006     buzzer(PTA5);
00007             float frequency[]={659,554,659,554,550,494,554,587,494,659,554,440};
00008             //frequency array
00009             float beat[]={1,1,1,1,1,0.5,0.5,1,1,1,1,2};
00010             //beat array
00011     int
00012     main() {
00013     while (1) {
00014     for (
00015         int
00016         i
00017         =0;
00018         i
00019         <=11;
00020         i
00021         ++) {
00022             buzzer.period
00023             (1/(frequency[
00024             i
00025             ])); 
00026             // set PWM period
00027                 buzzer=0.5;
00028                 set duty cycle
00029                 wait(0.5*beat[
00030                 i
00031                 ]);
00032                 hold for beat period
00033                 }
00034         }
00035 }