main.cpp

00001 #include "mbed.h"
00002 
00003 Serial pc(USBTX,USBRX); // do not need when we aren't communicating with pc
00004 DigitalOut myled1(LED1); //LEDs 1 and 2
00005 DigitalOut myled2(LED2);
00006 DigitalIn button(p17); // button attached to p17
00007 Timer led2timer; // create timer
00008 
00009 int main() {
00010 
00011 int currentstate=0; // set variables as integers
00012 int previousstate=0;
00013 int counter=0;
00014 
00015 led2timer.start(); // starts timer
00016 
00017     while(1) {
00018         
00019         currentstate=button.read(); // set current state
00020         
00021         if (currentstate==1){ // button pressed
00022             if (led2timer.read()>=1){ // blinks 1s interval when pressed
00023                 myled2=!myled2;
00024                 led2timer.reset(); // reset timer
00025                 }
00026             
00027             if (currentstate==previousstate){ // no change
00028                 }
00029                 
00030             else{ // change in state adds counter
00031                 counter=counter+1;
00032                 pc.printf("count=%i \r\n",counter);
00033                 }
00034                 
00035             } // if
00036             
00037         else { // button released
00038             if (led2timer.read()>=0.3){ // blinks 0.3s interval when released
00039                 myled2=!myled2;
00040                 led2timer.reset(); // reset timer
00041                 }
00042             
00043             if (currentstate==previousstate){ // no change
00044                 }
00045                 
00046             else{ // change in state adds counter
00047                 counter=counter+1;
00048                 pc.printf("count=%i \r\n",counter);
00049                 }
00050             
00051             } // else
00052         
00053         if (counter==10){ // counter reaches 10 turns on led1
00054             myled1=1;
00055             } // if
00056         
00057         previousstate=currentstate; //set previous state at loop end
00058         
00059         wait(0.1); // prevents the counter from counting switch bounces
00060                    // wait is ok because it it shorter than the timer 0.3
00061         
00062     } // while
00063     
00064 } // main