/* Sound the speaker at 440Hz
 *
 * The speaker is connected to P5.6.
 * The delay counter is empirically derived.
 *
 * Built and tested with MSP432P401R Rev. C, Keil MDK-ARM v5.24a and MSP432P4xx_DFP v3.1.0
 */

#include "msp.h"

void delay(void);

int main(void) {
    P5->DIR |= 0x40;        /* configure P5.6 as output */
    
    for (;;) {
        P5->OUT |= 0x40;
        delay();
        P5->OUT &= ~0x40;
        delay();
    }
}

void delay(void) {
    int i;
    
    for (i = 851; i > 0; i--);      /* Delay */
}