px4-firmware/apps/px4/tests/tests_file.c

/****************************************************************************
 *
 *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
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 * modification, are permitted provided that the following conditions
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/**
 * @file tests_file.c
 *
 * File write test.
 */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <systemlib/err.h>
#include <systemlib/perf_counter.h>
#include <string.h>

#include <drivers/drv_hrt.h>

#include "tests.h"

int
test_file(int argc, char *argv[])
{
	uint8_t buf[512];
	hrt_abstime start, end;
	perf_counter_t wperf = perf_alloc(PC_ELAPSED, "SD writes");

	int fd = open("/fs/microsd/testfile", O_TRUNC | O_WRONLY | O_CREAT);
	memset(buf, 0, sizeof(buf));

	start = hrt_absolute_time();
	for (unsigned i = 0; i < 1024; i++) {
		perf_begin(wperf);
		write(fd, buf, sizeof(buf));
		perf_end(wperf);
	}
	end = hrt_absolute_time();

	close(fd);

	warnx("512KiB in %llu microseconds", end - start);
	perf_print_counter(wperf);
	perf_free(wperf);

	return 0;
}