/**
 * @file    main.c
 * @brief   UART console, interrupt-driven 4×4 keypad input, and Morse LED blink on MSP430FR2355.
 *
 * Initializes peripheral modules and enters low-power mode, waking on keypress
 * interrupts to blink Morse code on LED and echo keys over UART.
 *
 * @date    2025-07-02
 */

#include <msp430.h>
#include <driverlib.h>
#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include "src/keypad.h"
#include "src/morse.h"
#include "src/i2c.h"
#include "src/lcd.h"
#include "src/Board.h"
#include "src/timer.h"
#include "src/state_machine.h"

/** On-board LED port and pin (used by Morse module) */
#define LED_PORT        GPIO_PORT_P1    /**< On-board LED port */
#define LED_PIN         GPIO_PIN0       /**< On-board LED pin */

/**
 * @brief Main application entry point.
 *
 * Sets up GPIO, UART, keypad interrupts, and enters low-power loop.
 * On keypress, echoes key over UART.
 *
 * @return Never returns
 */
int main(void)
{
    /* Stop watchdog and unlock GPIO pins */
    WDT_A_hold(WDT_A_BASE);
    PMM_unlockLPM5();

    /* Initialize on-board LED (used by Morse blinking) */
    GPIO_setAsOutputPin(LED_PORT, LED_PIN);
    GPIO_setOutputLowOnPin(LED_PORT, LED_PIN);

    init_timer();
    i2c_init();
    lcd_init();

    sm_init();
    sm_loop();
}