srf04.h

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/*
 * Copyright (C) 2018 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include <stdint.h>
#include <stdio.h>
 
#include "periph/gpio.h"
#include "xtimer.h"
 
#ifdef __cplusplus
extern "C" {
#endif

enum {
    SRF04_OK            =  0,   
    SRF04_ERR_INVALID   = -1,   
    SRF04_ERR_MEASURING = -2,   
    SRF04_ERR_GPIO      = -3,   
};

typedef struct {
    gpio_t trigger;     
    gpio_t echo;        
} srf04_params_t;

typedef struct {
    srf04_params_t p;   
    int32_t distance;   
    uint32_t time;      
} srf04_t;

int srf04_init(srf04_t *dev, const srf04_params_t *params);

void srf04_trigger(const srf04_t *dev);

int srf04_read(const srf04_t *dev);

int srf04_get_distance(const srf04_t *dev);
 
#ifdef __cplusplus
}
#endif