intervalMeasure.cpp

00001 #include "mbed.h"
00002 #include "dispBoB.h"
00003 
00004 dispBoB db(p28, p27, p26);          //instantiate a dispBoB object
00005 InterruptIn trigger(p12);           //set up the trigger as an external interrupt
00006 Timer t;
00007 
00008 bool b = false;
00009 
00010 void trig(){                        //function to call upon interrupt
00011     db.locate(0);
00012     db.printf("%06d", t.read_ms()); //print current time reading 
00013     if(b == false){
00014         t.start();                  //start timer
00015         b = true;
00016     } else {
00017         t.stop();                   //stop timer
00018         db.printf("06d", t.read_ms());  //print out stopwatch time in milliseconds
00019         t.reset();                  //reset and restart timer
00020         t.start();
00021     }
00022 }
00023 
00024 int main() {
00025     trigger.mode(PullUp);           //activate internal pull up (hardware specific)
00026     db.init();                      //ALWAYS initialise the dispBoB 
00027     db.cls();                       
00028     trigger.rise(&trig);            //attach trig() to interrupt on rising edge of trigger
00029 
00030     db.printf("%06d", t.read_ms()); //print initial time reading (000000)
00031     
00032     //To change the timebase just replace the read_ms() function with
00033     //read() for seconds and read_us() for microseconds. These use a 32bit 
00034     //int microsecond counter, so have a max time of ~30mins
00035 }