Fatema A.Razaq
a simple code for elevator
Dependencies: PinDetect mbed Servo
beeper.cpp@0:85829f7bbe62, 2012-06-04 (annotated)
- Committer:
- kemken
- Date:
- Mon Jun 04 13:51:43 2012 +0000
- Revision:
- 0:85829f7bbe62
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| kemken | 0:85829f7bbe62 | 1 | /* |
| kemken | 0:85829f7bbe62 | 2 | * PROGRAM RESPONSIBLE FOR BEEPING. |
| kemken | 0:85829f7bbe62 | 3 | * ^^^^^^^ ^^^^^^^^^^^ ^^^ ^^^^^^^ |
| kemken | 0:85829f7bbe62 | 4 | * |
| kemken | 0:85829f7bbe62 | 5 | * FILE NAME: beeper.cpp |
| kemken | 0:85829f7bbe62 | 6 | * USAGE: a simple beep program. |
| kemken | 0:85829f7bbe62 | 7 | */ |
| kemken | 0:85829f7bbe62 | 8 | |
| kemken | 0:85829f7bbe62 | 9 | |
| kemken | 0:85829f7bbe62 | 10 | |
| kemken | 0:85829f7bbe62 | 11 | /* |
| kemken | 0:85829f7bbe62 | 12 | * including the wanted library files. |
| kemken | 0:85829f7bbe62 | 13 | */ |
| kemken | 0:85829f7bbe62 | 14 | #include "mbed.h" |
| kemken | 0:85829f7bbe62 | 15 | #include "beeper.h" |
| kemken | 0:85829f7bbe62 | 16 | #include "main.h" |
| kemken | 0:85829f7bbe62 | 17 | |
| kemken | 0:85829f7bbe62 | 18 | AnalogOut beeper(p18); /*set the voltage of an analog output pin*/ |
| kemken | 0:85829f7bbe62 | 19 | Ticker bing_timer; /* using ticker class which repeatedly call a function*/ |
| kemken | 0:85829f7bbe62 | 20 | |
| kemken | 0:85829f7bbe62 | 21 | /*--------------------------*\ |
| kemken | 0:85829f7bbe62 | 22 | * defineding the variables* |
| kemken | 0:85829f7bbe62 | 23 | \*--------------------------*/ |
| kemken | 0:85829f7bbe62 | 24 | const signed short *ptr; |
| kemken | 0:85829f7bbe62 | 25 | signed short a; |
| kemken | 0:85829f7bbe62 | 26 | int b; |
| kemken | 0:85829f7bbe62 | 27 | unsigned short c; |
| kemken | 0:85829f7bbe62 | 28 | int order; |
| kemken | 0:85829f7bbe62 | 29 | |
| kemken | 0:85829f7bbe62 | 30 | void bing(void) { // a function that defined the number of elements |
| kemken | 0:85829f7bbe62 | 31 | order=23118; |
| kemken | 0:85829f7bbe62 | 32 | ptr=ding; |
| kemken | 0:85829f7bbe62 | 33 | } |
| kemken | 0:85829f7bbe62 | 34 | |
| kemken | 0:85829f7bbe62 | 35 | void beep (void) { // a function responsible of creating sound |
| kemken | 0:85829f7bbe62 | 36 | |
| kemken | 0:85829f7bbe62 | 37 | if (order) { |
| kemken | 0:85829f7bbe62 | 38 | /******************************************************** |
| kemken | 0:85829f7bbe62 | 39 | * this part is converting sined values to unsigned * |
| kemken | 0:85829f7bbe62 | 40 | * so as to make the sound clear * |
| kemken | 0:85829f7bbe62 | 41 | ********************************************************/ |
| kemken | 0:85829f7bbe62 | 42 | a=*ptr; |
| kemken | 0:85829f7bbe62 | 43 | ptr++; |
| kemken | 0:85829f7bbe62 | 44 | b=a; |
| kemken | 0:85829f7bbe62 | 45 | c= (unsigned short)b; |
| kemken | 0:85829f7bbe62 | 46 | beeper=c; |
| kemken | 0:85829f7bbe62 | 47 | if (--order==0) // when the beeping is finish a new event will be called (timeout) |
| kemken | 0:85829f7bbe62 | 48 | new_event(timeout); |
| kemken | 0:85829f7bbe62 | 49 | } |
| kemken | 0:85829f7bbe62 | 50 | } |
| kemken | 0:85829f7bbe62 | 51 | |
| kemken | 0:85829f7bbe62 | 52 | void bing_start (void) { // a ticker function for the beeper. |
| kemken | 0:85829f7bbe62 | 53 | beeper=0; |
| kemken | 0:85829f7bbe62 | 54 | order=0; |
| kemken | 0:85829f7bbe62 | 55 | bing_timer.attach_us(&beep,23); // repeatedly call "beep" function. |
| kemken | 0:85829f7bbe62 | 56 | } |