#include  <msp430x20x2.h>

#define LEDul   0x01        //The upper left LED is connected to bit 0
#define LEDml   0x02        //The middle left LED is connected to bit 1
#define LEDll   0x04
#define LEDc    0x08        //The center LED is connected to bit 3
#define LEDur   0x10
#define LEDmr   0x20
#define LEDlr   0x40

#define PB        0x40

#define    DIESTATE1 1            //Note: these numbers are abitrary,
#define    DIESTATE2 2            //  they just need to be unique.
#define    DIESTATE3 3
#define    DIESTATE4 4
#define    DIESTATE5 5
#define    DIESTATE6 6
//Also... if you know C, a quicker way to do this is to create an enumerated type (enum)

void LED_Die(int val) {
    switch (val) {
        case 0:  P1OUT = 0; break;
        case 1:  P1OUT = LEDc; break;
        case 2:  P1OUT = LEDur | LEDll; break;
        case 3:  P1OUT = LEDc | LEDul | LEDlr; break;
        case 4:  P1OUT = LEDul | LEDll | LEDur | LEDlr; break;
        case 5:  P1OUT = LEDc | LEDul | LEDll | LEDur | LEDlr; break;
        case 6:  P1OUT = LEDul | LEDll | LEDur | LEDlr | LEDml | LEDmr; break;
        default: P1OUT = 0;        // This should never happen!
    }
}
            
        
//*********************************************************************
void main(void) {
volatile int myState;
    WDTCTL = WDTPW + WDTHOLD;  // Stop watchdog
    P1DIR = P1DIR | LEDc |LEDul | LEDll | LEDur | LEDlr | LEDml | LEDmr;   // P1.0-P1.6 are output
    P2SEL = P2SEL & ~PB;       //Clear select bit (makes P2.6 an input)
   
    myState = DIESTATE1;
    
    while (1) {         //Do this forever
        //**************************************************************
        //Code for state transitions.  This code only figures out what
        //state transitions to make, and then makes them.
        switch (myState) {
             case DIESTATE1: if (!(PB & P2IN)) myState = DIESTATE2;
                             break;
             case DIESTATE2: if (!(PB & P2IN)) myState = DIESTATE3;
                             break;
             case DIESTATE3: if (!(PB & P2IN)) myState = DIESTATE4;
                             break;
             case DIESTATE4: if (!(PB & P2IN)) myState = DIESTATE5;
                             break;
             case DIESTATE5: if (!(PB & P2IN)) myState = DIESTATE6;
                             break;
             case DIESTATE6: if (!(PB & P2IN)) myState = DIESTATE1;
                             break;
             default:        myState=DIESTATE1;    // This should never happen!
        }
        
        //**************************************************************
        //Code for state outputs.  This just decides on system outputs
        //based on the current state and inputs to system.
         switch (myState) {
             case DIESTATE1: if (!(PB & P2IN)) LED_Die(0);
                             else LED_Die(1);
                             break;
             case DIESTATE2: if (!(PB & P2IN)) LED_Die(0);
                             else LED_Die(2);
                             break;
             case DIESTATE3: if (!(PB & P2IN)) LED_Die(0);
                             else LED_Die(3);
                             break;
             case DIESTATE4: if (!(PB & P2IN)) LED_Die(0);
                             else LED_Die(4);
                             break;
             case DIESTATE5: if (!(PB & P2IN)) LED_Die(0);
                             else LED_Die(5);
                             break;
             case DIESTATE6: if (!(PB & P2IN)) LED_Die(0);
                             else LED_Die(6);
                             break;
             default:        LED_Die(0);  // This should never happen!
        }
    }
}