/*
 * lab2_base.c
 *
 *  Created on: Dec 5, 2017
 *      Author: johnsontimoj
 */
///////////////////////////////////////////
//
// This codes flashes an external LED on and off
//    and prints on or off to the console
//
// The external LED is connected to P4.0
//    which is bit 0 on PORT 4
//
// Inputs: none
// Outputs: external LED
//
/////////////////////////////////////////////

// includes
#include "msp.h"     // includes all the MSP details
#include <stdio.h>   // includes our print and scan functions

void main(void){
    setbuf(stdout, NULL);	// Code Composer Bug Fix

    // Set the direction for Port 4, bit 0 to OUTPUT
    //    this requires Port4 direction register bit 0 to be a 1
    // Want P4 Direction register to be abcd efg1
    // So we would take the current value abcd efgh
    //    and OR it with 0000 0001
    // This would require:                          P4->DIR = P4->DIR | 0x01;
    //    but we can use the shorthand version:     P4->DIR |= 0x01;
    P4->DIR |= 0x01;

    printf("Lab2 base\n");      // print out lab ID and a new line

    while(1){           // create an infinite loop

        // Set the value for Port 4, bit 0 to 1 to turn on the LED
        //    this requires Port4 output register bit 0 to be a 1
        P4->OUT |= 0x01;
        printf("ON\n");

        // Delay for 1 sec (3M clocks given a 3MHz clock frequency - default for msp432)
        __delay_cycles(3000000);

        // Set the value for Port 4, bit 0 to 0 to turn off the LED
        //    this requires Port4 output register bit 0 to be a 0
        P4->OUT &= ~0x01;
        printf("OFF\n");

        // Delay for 1 sec
        __delay_cycles(3000000);

    } // end while
    return;
} // end main