test_uart_send.c

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/**
 * @file test_uart_send.c
 * Tests the uart send functionality.
 *
 * @author Lorenz Meier <lorenz@px4.io>
 */

#include <px4_platform_common/px4_config.h>

#include <sys/types.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <arch/board/board.h>

#include "tests_main.h"

#include <math.h>
#include <float.h>
#include <drivers/drv_hrt.h>


int test_uart_send(int argc, char *argv[])
{
    /* input handling */
    char *uart_name = "/dev/ttyS3";

    if (argc > 1) { uart_name = argv[1]; }

    /* assuming NuttShell is on UART1 (/dev/ttyS0) */
    int test_uart = open(uart_name, O_RDWR | O_NONBLOCK | O_NOCTTY); //

    if (test_uart < 0) {
        printf("ERROR opening UART %s, aborting..\n", uart_name);
        return test_uart;

    } else {
        printf("Writing to UART %s\n", uart_name);
    }

    char sample_test_uart[25];// = {'S', 'A', 'M', 'P', 'L', 'E', ' ', '\n'};

    int i, n;

    uint64_t start_time = hrt_absolute_time();

    for (i = 0; i < 30000; i++) {
        n = sprintf(sample_test_uart, "SAMPLE #%d\n", i);
        write(test_uart, sample_test_uart, n);
    }

    int interval = hrt_absolute_time() - start_time;

    int bytes = i * sizeof(sample_test_uart);

    printf("Wrote %d bytes in %d ms on UART %s\n", bytes, interval / 1000, uart_name);

    close(test_uart);

    return 0;
}