File content as of revision 2:5ad6ad8c563a:

#include "mbed.h"
#include <math.h>  
#include "SLCD.h"

#define LEDON false
#define LEDOFF true
#define NUMBUTS 2
#define LBUT PTC12  // port addresses for buttons
#define RBUT PTC3
#define STOPPEDSTATE 0
#define TIMINGSTATE  1
#define RESETTINGSTATE 2
#define PRINTDELTA 0.01
#define LCDCHARLEN 10
#define BUTTONTIME 0.2
#define FULLMINUTE 60 //seconds
#define PROGNAME "kl46z_stop_watch_v1\n\r"
#define LCDTITLE "STPW"
#define TITLEWAIT 2.0

//#define PRINTDBUG // uncomment if printing to serial port desired

SLCD slcd; //define LCD display
Serial pc(USBTX, USBRX);

Timer ButtonTimer; // for reading button states
DigitalIn buttons[NUMBUTS] = {RBUT, LBUT};
int displayState = STOPPEDSTATE;



void initialize_global_vars(){
    pc.printf(PROGNAME);
    // set up DAQ timer
    // set up DAQ timers
    ButtonTimer.start();
    ButtonTimer.reset(); 
} 

void LCDMess(char *lMess){
        slcd.Home();
        slcd.clear();
        slcd.printf(lMess);
}
void showTitle(){
    LCDMess(LCDTITLE);
    wait(TITLEWAIT);
    return;
}
int main(void) {
    int i;
    char lcdData[LCDCHARLEN];
    PwmOut gled(LED_GREEN);
    PwmOut rled(LED_RED);
    pc.printf(PROGNAME);
    float secondsCount = 0.0;
    int minutesCount; // for displaying mininuts
    int seconds; //
    int fifthSeconds;
    bool statetoggle = false; //was in stopped state.
    
    int RButtonState;
    int LButtonState;
    
    
    initialize_global_vars();
    showTitle();

     while (true) {
        
        LButtonState = !buttons[1].read();
        RButtonState = !buttons[0].read();
        
        
        if (ButtonTimer > BUTTONTIME){
            for (i=0; i<NUMBUTS; i++){ // index will be 0 or 1 
                
                    if(LButtonState && RButtonState) {  //a butttons is pressed
                        displayState = RESETTINGSTATE;
                        statetoggle = !statetoggle;              

                            break;
                    }
                    else if(LButtonState){
                        displayState = TIMINGSTATE;
                             statetoggle = !statetoggle;              
                             break;
                    }
                    else if(RButtonState){
                        displayState = STOPPEDSTATE;              
                            break;
                    }
                    else{
                        ButtonTimer.reset();
                        break;
                    } 
            }
        
            
            ButtonTimer.reset();
            switch (displayState){
                    case STOPPEDSTATE : {                     
                        rled = 0.0;
                        gled = 1.0;
                        break;
                    }
                    
                    case RESETTINGSTATE:
                        if (statetoggle){
                            secondsCount = 0;
                            displayState = TIMINGSTATE;
                        }
                        rled = 0.0;
                        gled = 0.0;
                        break;
                        
                        
                    case TIMINGSTATE : {
                        if(statetoggle){
                            secondsCount = secondsCount + BUTTONTIME; 
                        }                   
                        rled = 1.0;
                        gled = 0.0;
                        break;
                    }
            }
            
            // Parse the seconds
            seconds = (int)secondsCount; // make seconds "mask"
            fifthSeconds = (int)((secondsCount - (float)seconds) * 10); // the 0.2 seconds
            minutesCount = seconds / FULLMINUTE;
            seconds = seconds % FULLMINUTE;          
            sprintf (lcdData,"%1d.%02d.%1d",minutesCount,seconds,fifthSeconds);  
            LCDMess(lcdData);            
        }// end Button timer
    }
}