259 lines
9.3 KiB
C
259 lines
9.3 KiB
C
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/*
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* Copyright (c) 2006-2012 by Roland Riegel <feedback@roland-riegel.de>
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <string.h>
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#include <avr/pgmspace.h>
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#include <avr/sleep.h>
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#include "fat.h"
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#include "fat_config.h"
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#include "partition.h"
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#include "sd_raw.h"
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#include "sd_raw_config.h"
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#include "lcd.h"
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#define DEBUG 1
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/**
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* \mainpage MMC/SD/SDHC card library
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*
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* This project provides a general purpose library which implements read and write
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* support for MMC, SD and SDHC memory cards.
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*
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* It includes
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* - low-level \link sd_raw MMC, SD and SDHC read/write routines \endlink
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* - \link partition partition table support \endlink
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* - a simple \link fat FAT16/FAT32 read/write implementation \endlink
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*
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* \section circuit The circuit
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* The circuit which was mainly used during development consists of an Atmel AVR
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* microcontroller with some passive components. It is quite simple and provides
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* an easy test environment. The circuit which can be downloaded on the
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* <a href="http://www.roland-riegel.de/sd-reader/">project homepage</a> has been
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* improved with regard to operation stability.
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*
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* I used different microcontrollers during development, the ATmega8 with 8kBytes
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* of flash, and its pin-compatible alternative, the ATmega168 with 16kBytes flash.
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* The first one is the one I started with, but when I implemented FAT16 write
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* support, I ran out of flash space and switched to the ATmega168. For FAT32, an
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* ATmega328 is required.
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*
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* The circuit board is a self-made and self-soldered board consisting of a single
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* copper layer and standard DIL components, except of the MMC/SD card connector.
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*
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* The connector is soldered to the bottom side of the board. It has a simple
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* eject button which, when a card is inserted, needs some space beyond the connector
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* itself. As an additional feature the connector has two electrical switches
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* to detect wether a card is inserted and wether this card is write-protected.
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*
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* \section pictures Pictures
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* \image html pic01.jpg "The circuit board used to implement and test this application."
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* \image html pic02.jpg "The MMC/SD card connector on the soldering side of the circuit board."
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*
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* \section software The software
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* The software is written in C (ISO C99). It might not be the smallest or
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* the fastest one, but I think it is quite flexible. See the project's
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* <a href="http://www.roland-riegel.de/sd-reader/benchmarks/">benchmark page</a> to get an
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* idea of the possible data rates.
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*
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* I implemented an example application providing a simple command prompt which is accessible
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* via the UART at 9600 Baud. With commands similiar to the Unix shell you can browse different
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* directories, read and write files, create new ones and delete them again. Not all commands are
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* available in all software configurations.
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* - <tt>cat \<file\></tt>\n
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* Writes a hexdump of \<file\> to the terminal.
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* - <tt>cd \<directory\></tt>\n
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* Changes current working directory to \<directory\>.
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* - <tt>disk</tt>\n
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* Shows card manufacturer, status, filesystem capacity and free storage space.
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* - <tt>init</tt>\n
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* Reinitializes and reopens the memory card.
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* - <tt>ls</tt>\n
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* Shows the content of the current directory.
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* - <tt>mkdir \<directory\></tt>\n
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* Creates a directory called \<directory\>.
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* - <tt>mv \<file\> \<file_new\></tt>\n
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* Renames \<file\> to \<file_new\>.
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* - <tt>rm \<file\></tt>\n
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* Deletes \<file\>.
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* - <tt>sync</tt>\n
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* Ensures all buffered data is written to the card.
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* - <tt>touch \<file\></tt>\n
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* Creates \<file\>.
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* - <tt>write \<file\> \<offset\></tt>\n
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* Writes text to \<file\>, starting from \<offset\>. The text is read
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* from the UART, line by line. Finish with an empty line.
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*
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* \htmlonly
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* <p>
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* The following table shows some typical code sizes in bytes, using the 20090330 release with a
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* buffered read-write MMC/SD configuration, FAT16 and static memory allocation:
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* </p>
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*
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* <table border="1" cellpadding="2">
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* <tr>
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* <th>layer</th>
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* <th>code size</th>
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* <th>static RAM usage</th>
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* </tr>
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* <tr>
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* <td>MMC/SD</td>
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* <td align="right">2410</td>
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* <td align="right">518</td>
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* </tr>
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* <tr>
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* <td>Partition</td>
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* <td align="right">456</td>
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* <td align="right">17</td>
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* </tr>
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* <tr>
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* <td>FAT16</td>
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* <td align="right">7928</td>
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* <td align="right">188</td>
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* </tr>
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* </table>
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*
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* <p>
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* The static RAM is mostly used for buffering memory card access, which
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* improves performance and reduces implementation complexity.
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* </p>
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*
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* <p>
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* Please note that the numbers above do not include the C library functions
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* used, e.g. some string functions. These will raise the numbers somewhat
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* if they are not already used in other program parts.
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* </p>
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*
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* <p>
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* When opening a partition, filesystem, file or directory, a little amount
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* of RAM is used, as listed in the following table. Depending on the library
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* configuration, the memory is either allocated statically or dynamically.
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* </p>
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*
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* <table border="1" cellpadding="2">
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* <tr>
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* <th>descriptor</th>
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* <th>dynamic/static RAM</th>
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* </tr>
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* <tr>
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* <td>partition</td>
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* <td align="right">17</td>
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* </tr>
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* <tr>
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* <td>filesystem</td>
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* <td align="right">26</td>
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* </tr>
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* <tr>
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* <td>file</td>
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* <td align="right">53</td>
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* </tr>
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* <tr>
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* <td>directory</td>
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* <td align="right">49</td>
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* </tr>
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* </table>
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*
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* \endhtmlonly
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*
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* \section adaptation Adapting the software to your needs
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* The only hardware dependent part is the communication layer talking to the
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* memory card. The other parts like partition table and FAT support are
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* completely independent, you could use them even for managing Compact Flash
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* cards or standard ATAPI hard disks.
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*
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* By changing the MCU* variables in the Makefile, you can use other Atmel
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* microcontrollers or different clock speeds. You might also want to change
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* the configuration defines in the files fat_config.h, partition_config.h,
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* sd_raw_config.h and sd-reader_config.h. For example, you could disable
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* write support completely if you only need read support.
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*
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* For further information, visit the project's
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* <a href="http://www.roland-riegel.de/sd-reader/faq/">FAQ page</a>.
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*
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* \section bugs Bugs or comments?
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* If you have comments or found a bug in the software - there might be some
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* of them - you may contact me per mail at feedback@roland-riegel.de.
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*
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* \section acknowledgements Acknowledgements
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* Thanks go to Ulrich Radig, who explained on his homepage how to interface
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* MMC cards to the Atmel microcontroller (http://www.ulrichradig.de/).
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* I adapted his work for my circuit.
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*
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* \section copyright Copyright 2006-2012 by Roland Riegel
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation (http://www.gnu.org/copyleft/gpl.html).
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* At your option, you can alternatively redistribute and/or modify the following
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* files under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation (http://www.gnu.org/copyleft/lgpl.html):
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* - byteordering.c
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* - byteordering.h
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* - fat.c
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* - fat.h
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* - fat_config.h
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* - partition.c
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* - partition.h
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* - partition_config.h
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* - sd_raw.c
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* - sd_raw.h
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* - sd_raw_config.h
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* - sd-reader_config.h
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*/
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static struct fat_file_struct* open_file_in_dir(struct fat_fs_struct* fs, struct fat_dir_struct* dd, const char* name);
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int main()
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{
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lcd_init(LCD_DISP_ON);
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/* we will just use ordinary idle mode */
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set_sleep_mode(SLEEP_MODE_IDLE);
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/* open first partition */
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struct partition_struct* partition = partition_open(sd_raw_read,
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sd_raw_read_interval,
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0,
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0,
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0
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);
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if(!partition)
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{
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/* If the partition did not open, assume the storage device
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* is a "superfloppy", i.e. has no MBR.
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*/
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partition = partition_open(sd_raw_read,
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sd_raw_read_interval,
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0,
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0,
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-1
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);
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}
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/* open file system */
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struct fat_fs_struct* fs = fat_open(partition);
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/* open root directory */
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struct fat_dir_entry_struct directory;
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fat_get_dir_entry_of_path(fs, "/", &directory);
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struct fat_dir_struct* dd = fat_open_dir(fs, &directory);
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// Print out all files/directories in top level
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while (1) {
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struct fat_dir_entry_struct dir_entry;
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while(fat_read_dir(dd, &dir_entry)) {
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// print out directory entry name
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lcd_clrscr();
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lcd_gotoxy(0,0);
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lcd_puts(dir_entry.long_name);
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}
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}
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return 0;
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} |