Blink with Timer MSP430

Blinking the Internal LED on MSP430F5529LP: To blink the internal LED (LED1) on the MSP430F5529LP Launch Pad, you can use a timer interrupt. Here’s an example code snippet that achieves this:

#include <msp430.h>
#include <msp430f5529.h>

unsigned int timerCount = 0;

void main(void) {
    WDTCTL = WDTPW + WDTHOLD; // Disable watchdog
    P1DIR |= BIT0; // Set P1.0 (LED1) to output direction
    P1OUT &= ~BIT0; // Turn off the LED initially

    TA0CCR0 = (32768 - 1); // Set timer period (32768 cycles for 1 second)
    TA0CCTL0 = (CCIE + OUTMOD_6); // Enable interrupts for CCR0, toggle output
    TA0CTL = (TASSEL_0 + MC_1 + ID_3 + TACLR); // SMCLK, div 8, up mode, clear timer

    __enable_interrupt(); // Enable global interrupts

    for (;;) {
        // Do nothing while waiting for interrupts. Ideal place to use low power modes!

#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer0_A0_ISR(void) {
    timerCount = (timerCount + 1) % 3;
    if (timerCount == 0) {
        P1OUT ^= BIT0; // Toggle LED1
  1. Make sure to initialize the timer and interrupt correctly. The example above uses Timer A0 and toggles the LED every third interrupt. Adjust the timer settings as needed1.
  2. Using LPM3 for Delay and Wake-Up: If you want to generate a delay using Low-Power Mode 3 (LPM3) and wake up after the delay, follow these steps:
  3. Troubleshooting MSP430FR2311 Issues: If you’re facing issues after flashing the MSP430FR2311, ensure that you’ve configured the device correctly. Here’s an example snippet that puts the device into LPM4.5:
// Configure P2.6 and P2.7 as input direction pins
P2DIR &= ~(BIT6 + BIT7);
// Configure P2.6 and P2.7 as pulled-down
P2OUT &= ~(BIT6 + BIT7);
// Enable resistor register for P2.6 and P2.7
P2REN |= (BIT6 + BIT7);
// Set low-to-high edge for P2.6 and P2.7
P2IES &= ~(BIT6 + BIT7);
// Clear all P2 interrupt flags
P2IFG = 0x00;
// Enable interrupts for P2.6 and P2.7
P2IE |= (BIT6 + BIT7);

Feel free to ask if you need further assistance or have additional questions! 😊

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