211 lines
8.7 KiB
C++
211 lines
8.7 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* \file
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* \brief SdVolume class
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*/
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/**
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* Arduino SdFat Library
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* Copyright (C) 2009 by William Greiman
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*
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* This file is part of the Arduino Sd2Card Library
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*/
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#ifndef _SDVOLUME_H_
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#define _SDVOLUME_H_
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#include "SdFatConfig.h"
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#include "Sd2Card.h"
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#include "SdFatStructs.h"
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//==============================================================================
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// SdVolume class
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/**
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* \brief Cache for an SD data block
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*/
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union cache_t {
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uint8_t data[512]; // Used to access cached file data blocks.
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uint16_t fat16[256]; // Used to access cached FAT16 entries.
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uint32_t fat32[128]; // Used to access cached FAT32 entries.
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dir_t dir[16]; // Used to access cached directory entries.
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mbr_t mbr; // Used to access a cached Master Boot Record.
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fat_boot_t fbs; // Used to access to a cached FAT boot sector.
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fat32_boot_t fbs32; // Used to access to a cached FAT32 boot sector.
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fat32_fsinfo_t fsinfo; // Used to access to a cached FAT32 FSINFO sector.
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};
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/**
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* \class SdVolume
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* \brief Access FAT16 and FAT32 volumes on SD and SDHC cards.
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*/
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class SdVolume {
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public:
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// Create an instance of SdVolume
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SdVolume() : fatType_(0) {}
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/**
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* Clear the cache and returns a pointer to the cache. Used by the WaveRP
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* recorder to do raw write to the SD card. Not for normal apps.
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* \return A pointer to the cache buffer or zero if an error occurs.
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*/
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cache_t* cacheClear() {
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if (!cacheFlush()) return 0;
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cacheBlockNumber_ = 0xFFFFFFFF;
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return &cacheBuffer_;
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}
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/**
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* Initialize a FAT volume. Try partition one first then try super
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* floppy format.
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*
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* \param[in] dev The Sd2Card where the volume is located.
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*
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* \return true for success, false for failure.
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* Reasons for failure include not finding a valid partition, not finding
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* a valid FAT file system or an I/O error.
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*/
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bool init(Sd2Card* dev) { return init(dev, 1) ? true : init(dev, 0); }
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bool init(Sd2Card* dev, uint8_t part);
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// inline functions that return volume info
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uint8_t blocksPerCluster() const { return blocksPerCluster_; } //> \return The volume's cluster size in blocks.
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uint32_t blocksPerFat() const { return blocksPerFat_; } //> \return The number of blocks in one FAT.
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uint32_t clusterCount() const { return clusterCount_; } //> \return The total number of clusters in the volume.
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uint8_t clusterSizeShift() const { return clusterSizeShift_; } //> \return The shift count required to multiply by blocksPerCluster.
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uint32_t dataStartBlock() const { return dataStartBlock_; } //> \return The logical block number for the start of file data.
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uint8_t fatCount() const { return fatCount_; } //> \return The number of FAT structures on the volume.
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uint32_t fatStartBlock() const { return fatStartBlock_; } //> \return The logical block number for the start of the first FAT.
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uint8_t fatType() const { return fatType_; } //> \return The FAT type of the volume. Values are 12, 16 or 32.
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int32_t freeClusterCount();
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uint32_t rootDirEntryCount() const { return rootDirEntryCount_; } /** \return The number of entries in the root directory for FAT16 volumes. */
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/**
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* \return The logical block number for the start of the root directory
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* on FAT16 volumes or the first cluster number on FAT32 volumes.
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*/
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uint32_t rootDirStart() const { return rootDirStart_; }
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/**
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* Sd2Card object for this volume
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* \return pointer to Sd2Card object.
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*/
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Sd2Card* sdCard() { return sdCard_; }
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/**
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* Debug access to FAT table
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*
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* \param[in] n cluster number.
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* \param[out] v value of entry
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* \return true for success or false for failure
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*/
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bool dbgFat(uint32_t n, uint32_t* v) { return fatGet(n, v); }
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private:
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// Allow SdBaseFile access to SdVolume private data.
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friend class SdBaseFile;
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// value for dirty argument in cacheRawBlock to indicate read from cache
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static bool const CACHE_FOR_READ = false;
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// value for dirty argument in cacheRawBlock to indicate write to cache
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static bool const CACHE_FOR_WRITE = true;
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#if USE_MULTIPLE_CARDS
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cache_t cacheBuffer_; // 512 byte cache for device blocks
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uint32_t cacheBlockNumber_; // Logical number of block in the cache
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Sd2Card* sdCard_; // Sd2Card object for cache
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bool cacheDirty_; // cacheFlush() will write block if true
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uint32_t cacheMirrorBlock_; // block number for mirror FAT
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#else
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static cache_t cacheBuffer_; // 512 byte cache for device blocks
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static uint32_t cacheBlockNumber_; // Logical number of block in the cache
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static Sd2Card* sdCard_; // Sd2Card object for cache
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static bool cacheDirty_; // cacheFlush() will write block if true
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static uint32_t cacheMirrorBlock_; // block number for mirror FAT
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#endif
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uint32_t allocSearchStart_; // start cluster for alloc search
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uint8_t blocksPerCluster_; // cluster size in blocks
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uint32_t blocksPerFat_; // FAT size in blocks
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uint32_t clusterCount_; // clusters in one FAT
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uint8_t clusterSizeShift_; // shift to convert cluster count to block count
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uint32_t dataStartBlock_; // first data block number
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uint8_t fatCount_; // number of FATs on volume
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uint32_t fatStartBlock_; // start block for first FAT
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uint8_t fatType_; // volume type (12, 16, OR 32)
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uint16_t rootDirEntryCount_; // number of entries in FAT16 root dir
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uint32_t rootDirStart_; // root start block for FAT16, cluster for FAT32
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bool allocContiguous(uint32_t count, uint32_t* curCluster);
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uint8_t blockOfCluster(uint32_t position) const { return (position >> 9) & (blocksPerCluster_ - 1); }
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uint32_t clusterStartBlock(uint32_t cluster) const { return dataStartBlock_ + ((cluster - 2) << clusterSizeShift_); }
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uint32_t blockNumber(uint32_t cluster, uint32_t position) const { return clusterStartBlock(cluster) + blockOfCluster(position); }
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cache_t* cache() { return &cacheBuffer_; }
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uint32_t cacheBlockNumber() const { return cacheBlockNumber_; }
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#if USE_MULTIPLE_CARDS
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bool cacheFlush();
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bool cacheRawBlock(uint32_t blockNumber, bool dirty);
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#else
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static bool cacheFlush();
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static bool cacheRawBlock(uint32_t blockNumber, bool dirty);
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#endif
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// used by SdBaseFile write to assign cache to SD location
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void cacheSetBlockNumber(uint32_t blockNumber, bool dirty) {
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cacheDirty_ = dirty;
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cacheBlockNumber_ = blockNumber;
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}
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void cacheSetDirty() { cacheDirty_ |= CACHE_FOR_WRITE; }
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bool chainSize(uint32_t beginCluster, uint32_t* size);
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bool fatGet(uint32_t cluster, uint32_t* value);
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bool fatPut(uint32_t cluster, uint32_t value);
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bool fatPutEOC(uint32_t cluster) { return fatPut(cluster, 0x0FFFFFFF); }
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bool freeChain(uint32_t cluster);
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bool isEOC(uint32_t cluster) const {
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if (FAT12_SUPPORT && fatType_ == 12) return cluster >= FAT12EOC_MIN;
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if (fatType_ == 16) return cluster >= FAT16EOC_MIN;
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return cluster >= FAT32EOC_MIN;
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}
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bool readBlock(uint32_t block, uint8_t* dst) { return sdCard_->readBlock(block, dst); }
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bool writeBlock(uint32_t block, const uint8_t* dst) { return sdCard_->writeBlock(block, dst); }
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// Deprecated functions
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#if ALLOW_DEPRECATED_FUNCTIONS
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public:
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/**
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* \deprecated Use: bool SdVolume::init(Sd2Card* dev);
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* \param[in] dev The SD card where the volume is located.
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* \return true for success or false for failure.
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*/
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bool init(Sd2Card& dev) { return init(&dev); }
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/**
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* \deprecated Use: bool SdVolume::init(Sd2Card* dev, uint8_t vol);
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* \param[in] dev The SD card where the volume is located.
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* \param[in] part The partition to be used.
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* \return true for success or false for failure.
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*/
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bool init(Sd2Card& dev, uint8_t part) { return init(&dev, part); }
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#endif // ALLOW_DEPRECATED_FUNCTIONS
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};
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#endif // _SDVOLUME_H_
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