File content as of revision 2:de155cad0909:

#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.

    initialize_global_vars();
    showTitle();

    while (true) {
        if (ButtonTimer > BUTTONTIME) {       
            for (i=0; i<NUMBUTS; i++) { // index will be 0 or 1
                if(!buttons[i]) { // a buttton is pressed
                    displayState = i;
                } // if ! buttons
                else{
                        if(!buttons[i]){
                            { 
                                if(!buttons[i + 1]){
                                        displayState = 2;
                                    }
                                if(!buttons[i-1]){
                                                displayState = 2;
                                            }    }
                                }
                    }
            }// for loop to look at buttons
            
            switch (displayState){
                    case RESETTINGSTATE:
                        if (!statetoggle){
                            secondsCount = 0;
                            displayState = TIMINGSTATE;
                        }
                        rled = 0.0;
                        gled = 1.0;
                        break;
                    case TIMINGSTATE : {
                        statetoggle = !statetoggle;
                        if(statetoggle){
                            secondsCount = secondsCount + BUTTONTIME;
                        }
                        rled = 1.0;
                        gled = 0.0;
                        break;
                    }
                    case STOPPEDSTATE : {
                        
                        displayState = RESETTINGSTATE;
                        
                        rled = 0.0;
                        gled = 1.0;
                        break;
                    }
            }
         ButtonTimer.reset();
            // 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,"\r\n%1d.%02d.%1d \r\n",minutesCount,seconds,fifthSeconds);
            pc.printf (lcdData,"\r\n%1d.%02d.%1d","\r\n",minutesCount,seconds,fifthSeconds);
            LCDMess(lcdData);
        }// end Button timer
    }
}