/* Toggle LEDs on EduPad with MSP432 LaunchPad
 *
 * The four LEDs are connected to
 * LED3 - P2.4
 * LED2 - P2.5
 * LED1 - P3.3
 * LED0 - P3.2
 * CPU clock 3 MHz.
 *
 * Built and tested with MSP432P401R Rev. C, Keil MDK-ARM v5.24a and MSP432P4xx_DFP v3.1.0
 */

#include "msp.h"

void delayMs(int n);

int main(void) {
    P2->DIR |= 0x30;    /* P2.5, P2.4 set as output */
    P3->DIR |= 0xC;     /* P3.3, P3.2 set as output */

    while (1) {
        P2->OUT &= ~0x20;   /* turn off LED2, LED0 */
        P3->OUT &= ~4;
        P2->OUT |= 0x10;    /* turn on  LED3, LED1 */
        P3->OUT |= 8;
        delayMs(500);
        P2->OUT &= ~0x10;   /* turn off LED3, LED1 */
        P3->OUT &= ~8;
        P2->OUT |= 0x20;    /* turn on  LED2, LED0 */
        P3->OUT |= 4;
        delayMs(500);
    }
}

/* system clock at 3 MHz, MSP432P401R Rev. C, MSP432P4xx_DFP v3.1.0 */
void delayMs(int n) {
    int i, j;
    
    for (j = 0; j < n; j++)
        for (i = 750; i > 0; i--);      /* Delay */
}