CCS/MSP430FR2355: LED blinking code with timer interruppt

>SFRIE1 |= WDTIE; // Enable WDT interrupt

I don't see an ISR for this interrupt (WDT_VECTOR). Your program will freeze when it goes off.

I added the changes as suggested but still my codes goes inside timer interrupt once and then halts there and doesn't come out.

Do have a look on code.

//Header Files//
#include "msp430fr2355.h"
#include "stdint.h"

#define CALTDH0CTL1_256 *((unsigned int *)0x1A36)

void Init_Clocks (void);
void init_IO (void);
void init_WDT (void);
void init_TimerB (void);

unsigned int i = 0;
unsigned int j = 0;

void main (void)
{

WDTCTL = WDTPW + WDTHOLD; // Stop WDT
_delay_cycles(1000000);
Init_Clocks (); // Initialize clocks for 25 MHz

// init_TimerB ();

// init_WDT ();
init_IO ();

PM5CTL0 &= ~LOCKLPM5; // Engage GPIOs
// __enable_interrupt(); // Set GIE

_delay_cycles(1000000);

while(1)
{
j++;
if (j > 10000)
{
j = 0;
}
}
}
//end main

//WDT to restart ADC
void init_WDT (void)
{

WDTCTL = WDT_MDLY_32; // WDT 32ms from 1MHz, SMCLK, interval timer
//SFRIE1 |= WDTIE; // Enable WDT interrupt
}

void init_TimerB (void)
{

TB3CTL = TBSSEL__ACLK | MC_3 | TBCLR | TBIE; // SMCLK, up_down mode, clear TBR
TB3CCR0 = 3276;
TB3CCR1 = 1676;
TB3CCTL0 |= CCIE;

__bis_SR_register(GIE); // enable interrupts
__no_operation(); // For debugger

_EINT(); // Enable interrupts

}

// Clocks And Vcore
void Init_Clocks (void)
{

FRCTL0 = FRCTLPW | NWAITS_2;

__bis_SR_register(SCG0); // disable FLL
CSCTL3 |= SELREF__REFOCLK; // Set REFO as FLL reference source
CSCTL0 = 0; // clear DCO and MOD registers
CSCTL1 |= DCORSEL_7; // Set DCO = 24MHz
CSCTL2 = FLLD_0 + 731; // DCOCLKDIV = 24MHz
__delay_cycles(3);
__bic_SR_register(SCG0); // enable FLL
while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)); // FLL locked

CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK; // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
// default DCOCLKDIV as MCLK and SMCLK source
}

//IO INITIALISATION//
void init_IO (void)
{

//Indications
P2SEL0 &= ~ (BIT6); //GPIO-LED3
P2DIR |= (BIT6); //Output-LED3

__bis_SR_register(GIE);

}

/**************************************TIMERD0.1 INTERRUPT********************************************/

// Timer B1 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER3_B0_VECTOR
__interrupt void Timer3_B0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER3_B0_VECTOR))) Timer3_B0_ISR (void)
#else
#error Compiler not supported!
#endif
{

if (i > 100)
{
i = 0;
P2OUT |= (BIT6);
}
else
{
i++;
}

TB3CCTL1 &= ~CCIFG;
TB3CTL &= ~TBIFG;

}

I added the changes as suggested but still my codes goes inside timer interrupt once and then halts there and doesn't come out.

Do have a look on code.

//Header Files//
#include "msp430fr2355.h"
#include "stdint.h"

#define CALTDH0CTL1_256 *((unsigned int *)0x1A36)

void Init_Clocks (void);
void init_IO (void);
void init_WDT (void);
void init_TimerB (void);

unsigned int i = 0;
unsigned int j = 0;

void main (void)
{

WDTCTL = WDTPW + WDTHOLD; // Stop WDT
_delay_cycles(1000000);
Init_Clocks (); // Initialize clocks for 25 MHz

// init_TimerB ();

// init_WDT ();
init_IO ();

PM5CTL0 &= ~LOCKLPM5; // Engage GPIOs
// __enable_interrupt(); // Set GIE

_delay_cycles(1000000);

while(1)
{
j++;
if (j > 10000)
{
j = 0;
}
}
}
//end main

//WDT to restart ADC
void init_WDT (void)
{

WDTCTL = WDT_MDLY_32; // WDT 32ms from 1MHz, SMCLK, interval timer
//SFRIE1 |= WDTIE; // Enable WDT interrupt
}

void init_TimerB (void)
{

TB3CTL = TBSSEL__ACLK | MC_3 | TBCLR | TBIE; // SMCLK, up_down mode, clear TBR
TB3CCR0 = 3276;
TB3CCR1 = 1676;
TB3CCTL0 |= CCIE;

__bis_SR_register(GIE); // enable interrupts
__no_operation(); // For debugger

_EINT(); // Enable interrupts

}

// Clocks And Vcore
void Init_Clocks (void)
{

FRCTL0 = FRCTLPW | NWAITS_2;

__bis_SR_register(SCG0); // disable FLL
CSCTL3 |= SELREF__REFOCLK; // Set REFO as FLL reference source
CSCTL0 = 0; // clear DCO and MOD registers
CSCTL1 |= DCORSEL_7; // Set DCO = 24MHz
CSCTL2 = FLLD_0 + 731; // DCOCLKDIV = 24MHz
__delay_cycles(3);
__bic_SR_register(SCG0); // enable FLL
while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)); // FLL locked

CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK; // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
// default DCOCLKDIV as MCLK and SMCLK source
}

//IO INITIALISATION//
void init_IO (void)
{

//Indications
P2SEL0 &= ~ (BIT6); //GPIO-LED3
P2DIR |= (BIT6); //Output-LED3

__bis_SR_register(GIE);

}

/**************************************TIMERD0.1 INTERRUPT********************************************/

// Timer B1 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER3_B0_VECTOR
__interrupt void Timer3_B0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER3_B0_VECTOR))) Timer3_B0_ISR (void)
#else
#error Compiler not supported!
#endif
{

if (i > 100)
{
i = 0;
P2OUT |= (BIT6);
}
else
{
i++;
}

TB3CCTL1 &= ~CCIFG;
TB3CTL &= ~TBIFG;

}