/* www.MicroDigitalEd.com
 * p5_6.c Toggling blue LEDs at 1 Hz using Timer32 one-shot mode
 *
 * This program uses Timer32 to generate 1 second delay to
 * toggle the blue LED.
 * Master clock is running at 3 MHz. Timer32 is configured
 * as one-shot mode to count down from 3,000,000 to 0 to give
 * a 1 second delay. In order to restart another one-shot,
 * the TIMER32_1->LOAD register is reloaded.
 * The blue LED is connected to P2.2.
 *
 * Tested with Keil 5.20 and MSP432 Device Family Pack V2.2.0.
 */
#include "msp.h"

int main(void) {
    /* initialize P2.2 for blue LED */
    P2->SEL1 &= ~4;             /* configure P2.2 as simple I/O */
    P2->SEL0 &= ~4;
    P2->DIR |= 4;               /* P2.2 set as output */

    TIMER32_1->LOAD = 3000000;  /* set the reload value */

    /* no prescaler, one-shot mode, disable interrupt, 32-bit timer. */
    TIMER32_1->CONTROL = 0xC3;

    while (1) {
        while((TIMER32_1->RIS & 1) == 0); /* wait until the RAW_IFG is set */
        TIMER32_1->INTCLR = 0;          /* clear raw interrupt flag */
        P2->OUT ^= 4;           	    /* toggle blue LED */
        TIMER32_1->LOAD = 3000000;  /* reload LOAD register to restart one-shot */
    }
}