get_multiecho.c

Measure Multiecho Distance

Author

Satofumi KAMIMURA

$Id$

#include "urg_sensor.h"
#include "urg_utils.h"
#include "open_urg_sensor.h"
#include <stdio.h>
#include <stdlib.h>


static void print_echo_data(long data[], int index)
{
    int i;

    // [mm]
    for (i = 0; i < URG_MAX_ECHO; ++i) {
        printf("%ld, ", data[(URG_MAX_ECHO * index) + i]);
    }
}


static void print_data(urg_t *urg, long data[], int data_n, long time_stamp)
{
#if 1
    int front_index;

    (void)data_n;

    // \~japanese 前方のデータのみを表示
    // \~english display data in front of sensor
    front_index = urg_step2index(urg, 0);
    print_echo_data(data, front_index);
    printf("%ld\n", time_stamp);

#else
    (void)urg;

    int i;

    // \~japanese 全てのデータを表示
    // \~english display all steps data
    printf("# n = %d, time_stamp = %ld\n", data_n, time_stamp);
    for (i = 0; i < data_n; ++i) {
        print_echo_data(data, i);
        printf("\n");
    }
#endif
}


int main(int argc, char *argv[])
{
    enum {
        CAPTURE_TIMES = 10,
    };
    urg_t urg;
    long *data = NULL;
    long time_stamp;
    int n;
    int i;

    if (open_urg_sensor(&urg, argc, argv) < 0) {
        return 1;
    }

    data = (long *)malloc(urg_max_data_size(&urg) *
                          URG_MAX_ECHO * sizeof(data[0]));
    if (!data) {
        perror("urg_max_index()");
        return 1;
    }

    // \~japanese データ取得
    // \~english Measurement data
    urg_start_measurement(&urg, URG_MULTIECHO, CAPTURE_TIMES, 0);
    for (i = 0; i < CAPTURE_TIMES; ++i) {
        n = urg_get_multiecho(&urg, data, &time_stamp);
        if (n <= 0) {
            printf("urg_get_multiecho: %s\n", urg_error(&urg));
            free(data);
            urg_close(&urg);
            return 1;
        }
        print_data(&urg, data, n, time_stamp);
    }

    free(data);
    urg_close(&urg);

#if defined(URG_MSC)
    getchar();
#endif
    return 0;
}