time/stopwatch/source/main.c

#include <nds.h>

#include <stdio.h>
#include <time.h>

//the speed of the timer when using ClockDivider_1024
#define TIMER_SPEED (BUS_CLOCK/1024)

typedef enum
{
    timerState_Stop,
    timerState_Pause,
    timerState_Running
}TimerStates;


int main()
{
    consoleDemoInit();

    uint ticks = 0;
    TimerStates state = timerState_Stop;
    int down = keysDown();

    while(!(down & KEY_START))
    {
        swiWaitForVBlank();
        consoleClear();
        scanKeys();
        down = keysDown();

        if(state == timerState_Running)
        {
            ticks += timerElapsed(0);
        }

        if(down & KEY_A)
        {
            if(state == timerState_Stop)
            {
                timerStart(0, ClockDivider_1024, 0, NULL);
                state = timerState_Running;
            }
            else if(state == timerState_Pause)
            {
                timerUnpause(0);
                state = timerState_Running;
            }
            else if(state == timerState_Running)
            {
                ticks += timerPause(0);
                state = timerState_Pause;
            }
        }
        else if(down & KEY_B)
        {
            timerStop(0);
            ticks = 0;
            state = timerState_Stop;
        }

        iprintf("Press A to start and pause the \ntimer, B to clear the timer \nand start to quit the program.\n\n");
        iprintf("ticks:  %u\n", ticks);
        iprintf("second: %u:%u\n", ticks/TIMER_SPEED, ((ticks%TIMER_SPEED)*1000) /TIMER_SPEED);
    }

    if(state != timerState_Stop)
    {
        timerStop(0);
    }

    return 0;
}