94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
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/*
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* c't-Bot
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your
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* option) any later version.
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* This program is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307, USA.
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*
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*/
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/*! @file mini-fat.c
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* @brief Routinen zum Auffinden von markierten Files auf einer MMC-Karte.
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* Dies ist keine vollstaendige FAT-Unterstuetzung, sondern sucht nur eien Datei, die mit einer 3-Zeichen Sequenz beginnt.
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* @author Benjamin Benz (bbe@heise.de)
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* @author Ulrich Radig (mail@ulrichradig.de) www.ulrichradig.de
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* @date 07.11.06
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*/
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#include "ct-Bot.h"
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#ifdef MCU
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#ifdef MINI_FAT_AVAILABLE
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#include "mmc.h"
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#include "display.h"
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#include "mini-fat.h"
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/*!
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* Sucht einen Block auf der MMC-Karte, dessen erste drei Bytes dem key entsprechen
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* liefert dann den folgenden Block zurueck.
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* Achtung das prinzip geht nur, wenn die Dateien nicht fragmentiert sind
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* @param key 3 Byte zur Identifikation
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* @param buffer Zeiger auf 512 Byte Puffer im SRAM
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*/
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uint32 mini_fat_find_block(const char* filename, uint8* buffer){
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// Suche nach der Datei fuer die Katrte
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int8 found = False;
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uint32 card_size= mmc_get_size() >> 9; // groesse der Karte in Bloecken
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#ifdef DISPLAY_AVAILABLE
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display_cursor(2,1);
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display_printf("Find %s: 0x",filename);
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uint16 i=0, j=0;
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#endif
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uint32 block=0;
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while(found == False && block < card_size){
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#ifdef DISPLAY_AVAILABLE
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display_cursor(2,13);
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display_printf("%02x%04x",j,i );
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if (i==65535)
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j++;
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i++;
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#endif
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mmc_read_sector(block++,buffer);
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uint8 i;
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for (i=0; i<MMC_FILENAME_MAX; i++)
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if (filename[i] == '\0'){
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found = True;
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break;
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} else if (filename[i] != buffer[i]) break;
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}
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if (found == False)
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return 0xFFFFFFFF;
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#ifdef DISPLAY_AVAILABLE
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i= block & 0xFFFF;
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j= (block >> 16) & 0xFFFF;
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display_cursor(2,1);
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display_printf("Found %s: 0x%02x%04x",filename,j,i);
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#endif
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// auf der Karte markieren, dass wir sie in der Hand hatten
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// buffer[3]++;
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// mmc_write_sector(block-1,buffer,0);
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return block;
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}
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#endif
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#endif
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