osd-contiki/examples/fat/example-fat.c

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/*
* Copyright (c) 2016, Benoît Thébaudeau <benoit@wsystem.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*---------------------------------------------------------------------------*/
/**
* \file
* Example demonstrating how to use the FAT file system.
*/
/*---------------------------------------------------------------------------*/
#include <stdio.h>
#include "contiki.h"
#include "ff.h"
/*---------------------------------------------------------------------------*/
PROCESS(example_fat_process, "FAT example");
AUTOSTART_PROCESSES(&example_fat_process);
/*---------------------------------------------------------------------------*/
#define TEST_FILENAME "test.txt"
#define TEST_LINE "Hello world!"
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(example_fat_process, ev, data)
{
static FATFS FatFs; /* Work area (file system object) for logical drive */
FIL fil; /* File object */
char line[82]; /* Line buffer */
FRESULT fr; /* FatFs return code */
PROCESS_BEGIN();
printf("FAT example\n");
/* Register work area to the default drive */
f_mount(&FatFs, "", 0);
printf("Writing \"%s\" to \"%s\"\n", TEST_LINE, TEST_FILENAME);
/* Create the test file */
fr = f_open(&fil, TEST_FILENAME, FA_WRITE | FA_CREATE_ALWAYS);
if(fr) {
printf("f_open() error: %d\n", fr);
PROCESS_EXIT();
}
/* Write the test line */
f_printf(&fil, "%s\n", TEST_LINE);
/* Close the file */
f_close(&fil);
printf("Reading back \"%s\":\n\n", TEST_FILENAME);
/* Open the test file */
fr = f_open(&fil, TEST_FILENAME, FA_READ);
if(fr) {
printf("f_open() error: %d\n", fr);
PROCESS_EXIT();
}
/* Read all the lines and display them */
while(f_gets(line, sizeof(line), &fil)) {
printf(line);
}
/* Close the file */
f_close(&fil);
printf("\nDone\n");
PROCESS_END();
}