How long does Program Example 4.7 take to play through the tune once? Calculate

Question

How long does Program Example 4.7 take to play through the tune once? Calculate

this by checking the program, then measure it as the program plays.

/*Program Example 4.7: Plays the tune "Oranges and Lemons" on a piezo buzzer, using PWM #include "mbed.h" PwmOut buzzer (p26); //frequency array float frequency[]=(659, 554,659,554 ,440,494 , 554,587 ,494,659 , 554,440); float beat [ ]=(1,1,1,1,1,0,5,0·5,1,1,1,1,2); int main() //beat array while (1) (int buzzer.period (1/(2*frequency[i])); buzze r=0 . 5 ; wait ( , 4*beat [ i ] ) ; for 1-0 ; i

Explanation / Answer

Considering that wait is only responsible for delay and and all other code (instruction fetch, loop constraint checking, assignment etc) does not take any time.

Total wait time: 0.4*[1+1+1+1+1+0.5+0.5+1+1+1+1+2] sec = 4.8 sec

So going through the document it should take 4.8 secs

Reality: It took little more than 5secs

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