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146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/**
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******************************************************************************
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*
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* @file pios.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* Parts by Thorsten Klose (tk@midibox.org) (tk@midibox.org)
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* @brief Access layer between DOSFS and PIOS
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Include files */
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#include <pios.h>
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#include "dosfs.h"
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/* Local variables */
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/* For caching - this feature has to be explicitly enabled, as it isn't reentrant */
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/* and requires to use the same buffer pointer whenever reading a file. */
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static uint32_t last_sector;
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static uint8_t caching_enabled = 0;
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void DFS_CachingEnabledSet(uint8_t enable)
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{
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caching_enabled = enable;
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last_sector = 0xffffffff;
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}
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/**
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* Converts directory name to canonical name
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* (missing pendant to DFS_anonicalToDir)
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* dest must point to a 13-byte buffer
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*/
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char *DFS_DirToCanonical(char *dest, char *src)
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{
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uint8_t pos = 0;
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while( pos < 8 && src[pos] != ' ' ) {
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*dest++ = src[pos++];
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}
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if( src[8] != ' ' ) {
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*dest++ = '.';
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pos = 8;
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while( pos < 11 && src[pos] != ' ' ) {
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*dest++ = src[pos++];
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}
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}
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/* Terminate string */
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*dest = 0;
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return dest;
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}
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/**
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* Read sector from SD Card
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* Returns 0 OK, nonzero for any error
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*/
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uint32_t DFS_ReadSector(uint8_t unit, uint8_t *buffer, uint32_t sector, uint32_t count)
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{
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/* Only allow access to single unit */
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if(unit != 0) {
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return 1;
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}
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/* According to README.txt, count is always 1 - check this! */
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if(count != 1) {
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return 2;
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}
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/* Cache: */
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if(caching_enabled && sector == last_sector) {
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/* we assume that sector is already in *buffer */
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/* since the user has to take care that the same buffer is used for file reads, this */
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/* feature has to be explicitly enabled with DFS_CachingEnabledSet(uint8_t enable) */
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return 0;
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}
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last_sector = sector;
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/* Forward to PIOS */
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int32_t status;
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if((status = PIOS_SDCARD_SectorRead(sector, buffer)) != 0) {
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/* Cannot access SD Card */
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return 3;
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}
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/* Success */
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return 0;
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}
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/**
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* Write sector to SD Card
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* Returns 0 OK, nonzero for any error
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*/
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uint32_t DFS_WriteSector(uint8_t unit, uint8_t *buffer, uint32_t sector, uint32_t count)
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{
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/* Only allow access to single unit */
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if(unit != 0) {
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return 1;
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}
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/* According to README.txt, count is always 1 - check this! */
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if(count != 1) {
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return 2;
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}
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/* Invalidate cache */
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last_sector = 0xffffffff;
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/* Forward to PIOS */
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int32_t status;
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if((status = PIOS_SDCARD_SectorWrite(sector, buffer)) < 0) {
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/* Cannot access SD Card */
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return 3;
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}
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/* Success */
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return 0;
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}
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