HC-SR04/main.c

/*
 * main.c
 *
 * Copyright 2024 dh33ex <dh33ex@riseup.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA or visit <http://www.gnu.org/licenses/>.
 *
 *
 */

#include <msp430g2553.h>
#include "hc-sr04.h"

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;

    /* use 1 MHz */
    if (CALBC1_1MHZ != 0xFF) {
        DCOCTL = 0;
        BCSCTL1 = CALBC1_1MHZ;
        DCOCTL = CALDCO_1MHZ;
    }

    P1DIR |= BIT0;
    P1OUT &= ~BIT0;

    HC_SR04_init(BIT1, BIT2);

    while (1) {
        __delay_cycles(10000);

        float distance = HC_SR04_mesure(BIT1, BIT2);

        if (distance > 20) {
            P1OUT |= BIT0;
        } else {
            P1OUT &= ~BIT0;
        }
    }

    return 0;
}