/*------------------------------------------------------------------------------
 * File:        p1.c
 * Function:    Prints out variables according to their Data Type with the size and the ranges of the variables
 * Description:
 * Input:       None
 * Output:      "
 * Author(s):   Noah Woodlee
 * Lab Section: 09
 * Date:        Nov 1, 2021
 *----------------------------------------------------------------------------*/

#include <msp430.h>
#define   SW1_PRESSED ((BIT0&P1IFG)==0)  // SW1 Status
#define   SW2_PRESSED ((BIT1&P1IFG)==0)  // SW2 Status

int Up =1;

int main(void)
{
    WDTCTL = WDT_MDLY_8;          // 8 ms interval
	_EINT();                      // Enable interrupts
	IE1 |= WDTIE;                 // Enable WDT interrupt
	P2DIR |= (BIT1 + BIT2);         // P2.1 and P2.2 set up as output
	P2SEL &= ~BIT1;               // Clear P2.1
	P2OUT |= BIT1;                // Turn on LED2
	P2OUT &= ~BIT2;               // Turn Off LED1
	P2SEL |= BIT2;                // P2.2 special function (TB0 output)
	TB0CTL = TBSSEL_2 | MC_1;     // Upmode
	TB0CCTL1 |= (OUTMOD_2 + CCIE);   // TB1 output is in Up mode and Interrupt
	TB0CCTL0 = CCIE;              // TB0 count triggers interrupt
	TB0CCR0 = 750;                // Set TB0 (and maximum) count value
	TB0CCR1 = Up;                 // Set TB1 count value
	P1IE |= BIT0;                   // P1.0 interrupt enabled
	P1IE |= BIT1;                   // P1.1 interrupt enabled
	P1IES |= BIT0;                  // P1.0 hi/low edge
	P1IFG &= ~BIT0;                 // P1.0 IFG cleared
	P1IES |= BIT1;                  // P1.1 hi/low edge
	P1IFG &= ~BIT1;                 // P1.1 IFG cleared
	_BIS_SR(LPM0_bits + GIE);   // Enter Low Power Mode 3
}

#pragma vector = TIMERB0_VECTOR
__interrupt void timerISR(void)
{
    P2OUT |= BIT1;                // Turn off LED2
    TB0CCTL0 &= ~CCIFG;            // Clear interrupt flag
}

#pragma vector = TIMERB1_VECTOR
__interrupt void timerISR2(void)
{
    P2OUT &= ~BIT1;                // Toggle LED2
    TB0CCTL1 &= ~CCIFG;            // Clear interrupt flag
}

// Watchdog Timer interrupt service routine
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
{
    TB0CCR1 += Up;          // Up=1, CCR1 will increase; Up = -1 CCR1 will decrease
    if(TB0CCR1 == 750){     // If CCR1 is upper-bound, Up becomes -1
        Up = -1;
    }
    if(TB0CCR1 ==0 ){       // If CCR1 is upper-bound, Up becomes 1
            Up = 1;
        }
}

// Port 1 interrupt service routine
#pragma vector = PORT1_VECTOR
__interrupt void Port1_ISR (void) {
    if(!SW1_PRESSED)
        WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
      }
    else if(!SW2_PRESSED)  WDTCTL = WDT_MDLY_8;          // 8 ms interval
    P1IES |= BIT0;                  // P1.0 hi/low edge
    P1IFG &= ~BIT0;                 // P1.0 IFG cleared
    P1IES |= BIT1;                  // P1.1 hi/low edge
    P1IFG &= ~BIT1;                 // P1.1 IFG cleared
}