main.cpp

00001 /*****************************************************************/
00002 /*               How to use State Machines in C                  */
00003 /*                        Switch|Case                            */
00004 /*****************************************************************/
00005 
00006 // Librarys:
00007 #include "mbed.h"
00008 
00009 // Configuration:
00010 DigitalOut led(LED1);
00011 Serial pc(USBTX,USBRX);
00012 
00013 //Functions
00014 
00015 
00016 int main(){
00017 /************STATES**************/
00018     enum states{
00019         LED_OF_1S,
00020         LED_ON_2S,
00021         LED_OF_3S,
00022         LED_ON_4S      
00023         };
00024     enum states state = LED_OF_1S;
00025 while(1){
00026     switch(state){
00027         case LED_OF_1S:
00028             
00029             //Led off for 1 second:
00030             led=0;
00031             pc.printf("LED_OF");
00032             wait(1);
00033             state = LED_ON_2S;
00034             
00035             break;    
00036         case LED_ON_2S:
00037             
00038             //Led on for 2 seconds:
00039             led=1;
00040             pc.printf("LED_ON");
00041             wait(2);
00042             state = LED_OF_3S;
00043             
00044             break;
00045         case LED_OF_3S:
00046             
00047             //Led off for 3 seconds:
00048             led=0;
00049             pc.printf("LED_OF");
00050             wait(3);
00051             state = LED_ON_4S;
00052             break;
00053         case LED_ON_4S:
00054             
00055             //Led on for 4 seconds:
00056             led=1;
00057             pc.printf("LED_ON");
00058             wait(4);
00059             state = LED_OF_1S;
00060             break;
00061         }           
00062     }
00063 }
00064