main.c

/* 
 * File:   main.c
 * Author: gvanhoy
 * Student: Toan Chu
 * Description: lab 0.
 * Created on August 27, 2015, 10:14 AM
 */

#include <xc.h>
#include <sys/attribs.h>
#include "switch.h"
#include "timer.h"
#include "led.h"
#include "interrupt.h"
#include "config.h"

#define OUTPUT 0
#define INPUT 1

//TODO: Define states of the state machine
typedef enum stateTypeEnum{
    init, waitPush, waitRelease, prevLED, nextLED 
} stateType;
stateType state = init; 

int main() {    
    //This function is necessary to use interrupts. 
    enableInterrupts();
    
    //TODO: Write each initialization function
    initSwitch1();
    initLEDs();
    //initTimer2();
    initTimer1();
    int led; 
    int i;
    while(1){
        switch(state)
        {
            //init case
            case init:
                led = 0;
                turnOnLED(0);//turn the top LED on
                state = waitPush;//move on to the next state
            break;
            //waitPush state
            case waitPush:
                if(PORTDbits.RD6 == 0)//check if the switch is pushed
                {
                    //for(i=0;i<10000;i++);
                    TMR1CLR = 0xFFFF;; // Clear the timer interrupt flag
                    state = waitRelease;                    
                    T1CONbits.TON = 1;//enable timer
                    IFS0bits.T1IF = 0;//put the flag down
                }
                else state = waitPush;//stay in waitPush if the switch is not pushed                    
                break;
            //waitRelease state
            case waitRelease:
                if(PORTDbits.RD6 == 1)//check if the switch is pushed
                { 
                    if(IFS0bits.T1IF == 1)//check if the flag is on
                    {
                        state = prevLED;//move to the previous state if the flag is on when hold more than 2 seconds
                        T1CONbits.TON = 0;//clear the timer when not in use
                    }
                    else{
                        state = nextLED;//move to the next state
                        T1CONbits.TON = 0;//clear the timer when not in use
                    } 
                }
                else{
                    state = waitRelease;//move to waitRelease
                }
                break;
            //go back to previous LED state
            case prevLED:
                if(led == 0)led=2;
                else if(led == 1)led=0;
                else if(led == 2)led=1;
                
                turnOnLED(led);                
                IFS0bits.T1IF = 0; 
                state = waitPush;
                T1CONbits.TON = 0;
                break;
            //go to next LED state
            case nextLED:
                if(led==0) led=1;
                else if(led == 1)led=2;
                else if (led == 2) led=0;
                
                turnOnLED(led);
                IFS0bits.T1IF = 0;
                state = waitPush;
                T1CONbits.TON = 0;
                break;
            
            default: break;            
        }             
    }
    
    return 0;
}