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Diffstat (limited to 'Tonokip_Firmware/SdVolume.cpp')
-rw-r--r--Tonokip_Firmware/SdVolume.cpp295
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diff --git a/Tonokip_Firmware/SdVolume.cpp b/Tonokip_Firmware/SdVolume.cpp
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--- a/Tonokip_Firmware/SdVolume.cpp
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-/* Arduino SdFat Library
- * Copyright (C) 2009 by William Greiman
- *
- * This file is part of the Arduino SdFat Library
- *
- * This Library is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This Library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with the Arduino SdFat Library. If not, see
- * <http://www.gnu.org/licenses/>.
- */
-#include "SdFat.h"
-//------------------------------------------------------------------------------
-// raw block cache
-// init cacheBlockNumber_to invalid SD block number
-uint32_t SdVolume::cacheBlockNumber_ = 0XFFFFFFFF;
-cache_t SdVolume::cacheBuffer_; // 512 byte cache for Sd2Card
-Sd2Card* SdVolume::sdCard_; // pointer to SD card object
-uint8_t SdVolume::cacheDirty_ = 0; // cacheFlush() will write block if true
-uint32_t SdVolume::cacheMirrorBlock_ = 0; // mirror block for second FAT
-//------------------------------------------------------------------------------
-// find a contiguous group of clusters
-uint8_t SdVolume::allocContiguous(uint32_t count, uint32_t* curCluster) {
- // start of group
- uint32_t bgnCluster;
-
- // flag to save place to start next search
- uint8_t setStart;
-
- // set search start cluster
- if (*curCluster) {
- // try to make file contiguous
- bgnCluster = *curCluster + 1;
-
- // don't save new start location
- setStart = false;
- } else {
- // start at likely place for free cluster
- bgnCluster = allocSearchStart_;
-
- // save next search start if one cluster
- setStart = 1 == count;
- }
- // end of group
- uint32_t endCluster = bgnCluster;
-
- // last cluster of FAT
- uint32_t fatEnd = clusterCount_ + 1;
-
- // search the FAT for free clusters
- for (uint32_t n = 0;; n++, endCluster++) {
- // can't find space checked all clusters
- if (n >= clusterCount_) return false;
-
- // past end - start from beginning of FAT
- if (endCluster > fatEnd) {
- bgnCluster = endCluster = 2;
- }
- uint32_t f;
- if (!fatGet(endCluster, &f)) return false;
-
- if (f != 0) {
- // cluster in use try next cluster as bgnCluster
- bgnCluster = endCluster + 1;
- } else if ((endCluster - bgnCluster + 1) == count) {
- // done - found space
- break;
- }
- }
- // mark end of chain
- if (!fatPutEOC(endCluster)) return false;
-
- // link clusters
- while (endCluster > bgnCluster) {
- if (!fatPut(endCluster - 1, endCluster)) return false;
- endCluster--;
- }
- if (*curCluster != 0) {
- // connect chains
- if (!fatPut(*curCluster, bgnCluster)) return false;
- }
- // return first cluster number to caller
- *curCluster = bgnCluster;
-
- // remember possible next free cluster
- if (setStart) allocSearchStart_ = bgnCluster + 1;
-
- return true;
-}
-//------------------------------------------------------------------------------
-uint8_t SdVolume::cacheFlush(void) {
- if (cacheDirty_) {
- if (!sdCard_->writeBlock(cacheBlockNumber_, cacheBuffer_.data)) {
- return false;
- }
- // mirror FAT tables
- if (cacheMirrorBlock_) {
- if (!sdCard_->writeBlock(cacheMirrorBlock_, cacheBuffer_.data)) {
- return false;
- }
- cacheMirrorBlock_ = 0;
- }
- cacheDirty_ = 0;
- }
- return true;
-}
-//------------------------------------------------------------------------------
-uint8_t SdVolume::cacheRawBlock(uint32_t blockNumber, uint8_t action) {
- if (cacheBlockNumber_ != blockNumber) {
- if (!cacheFlush()) return false;
- if (!sdCard_->readBlock(blockNumber, cacheBuffer_.data)) return false;
- cacheBlockNumber_ = blockNumber;
- }
- cacheDirty_ |= action;
- return true;
-}
-//------------------------------------------------------------------------------
-// cache a zero block for blockNumber
-uint8_t SdVolume::cacheZeroBlock(uint32_t blockNumber) {
- if (!cacheFlush()) return false;
-
- // loop take less flash than memset(cacheBuffer_.data, 0, 512);
- for (uint16_t i = 0; i < 512; i++) {
- cacheBuffer_.data[i] = 0;
- }
- cacheBlockNumber_ = blockNumber;
- cacheSetDirty();
- return true;
-}
-//------------------------------------------------------------------------------
-// return the size in bytes of a cluster chain
-uint8_t SdVolume::chainSize(uint32_t cluster, uint32_t* size) const {
- uint32_t s = 0;
- do {
- if (!fatGet(cluster, &cluster)) return false;
- s += 512UL << clusterSizeShift_;
- } while (!isEOC(cluster));
- *size = s;
- return true;
-}
-//------------------------------------------------------------------------------
-// Fetch a FAT entry
-uint8_t SdVolume::fatGet(uint32_t cluster, uint32_t* value) const {
- if (cluster > (clusterCount_ + 1)) return false;
- uint32_t lba = fatStartBlock_;
- lba += fatType_ == 16 ? cluster >> 8 : cluster >> 7;
- if (lba != cacheBlockNumber_) {
- if (!cacheRawBlock(lba, CACHE_FOR_READ)) return false;
- }
- if (fatType_ == 16) {
- *value = cacheBuffer_.fat16[cluster & 0XFF];
- } else {
- *value = cacheBuffer_.fat32[cluster & 0X7F] & FAT32MASK;
- }
- return true;
-}
-//------------------------------------------------------------------------------
-// Store a FAT entry
-uint8_t SdVolume::fatPut(uint32_t cluster, uint32_t value) {
- // error if reserved cluster
- if (cluster < 2) return false;
-
- // error if not in FAT
- if (cluster > (clusterCount_ + 1)) return false;
-
- // calculate block address for entry
- uint32_t lba = fatStartBlock_;
- lba += fatType_ == 16 ? cluster >> 8 : cluster >> 7;
-
- if (lba != cacheBlockNumber_) {
- if (!cacheRawBlock(lba, CACHE_FOR_READ)) return false;
- }
- // store entry
- if (fatType_ == 16) {
- cacheBuffer_.fat16[cluster & 0XFF] = value;
- } else {
- cacheBuffer_.fat32[cluster & 0X7F] = value;
- }
- cacheSetDirty();
-
- // mirror second FAT
- if (fatCount_ > 1) cacheMirrorBlock_ = lba + blocksPerFat_;
- return true;
-}
-//------------------------------------------------------------------------------
-// free a cluster chain
-uint8_t SdVolume::freeChain(uint32_t cluster) {
- // clear free cluster location
- allocSearchStart_ = 2;
-
- do {
- uint32_t next;
- if (!fatGet(cluster, &next)) return false;
-
- // free cluster
- if (!fatPut(cluster, 0)) return false;
-
- cluster = next;
- } while (!isEOC(cluster));
-
- return true;
-}
-//------------------------------------------------------------------------------
-/**
- * Initialize a FAT volume.
- *
- * \param[in] dev The SD card where the volume is located.
- *
- * \param[in] part The partition to be used. Legal values for \a part are
- * 1-4 to use the corresponding partition on a device formatted with
- * a MBR, Master Boot Record, or zero if the device is formatted as
- * a super floppy with the FAT boot sector in block zero.
- *
- * \return The value one, true, is returned for success and
- * the value zero, false, is returned for failure. Reasons for
- * failure include not finding a valid partition, not finding a valid
- * FAT file system in the specified partition or an I/O error.
- */
-uint8_t SdVolume::init(Sd2Card* dev, uint8_t part) {
- uint32_t volumeStartBlock = 0;
- sdCard_ = dev;
- // if part == 0 assume super floppy with FAT boot sector in block zero
- // if part > 0 assume mbr volume with partition table
- if (part) {
- if (part > 4)return false;
- if (!cacheRawBlock(volumeStartBlock, CACHE_FOR_READ)) return false;
- part_t* p = &cacheBuffer_.mbr.part[part-1];
- if ((p->boot & 0X7F) !=0 ||
- p->totalSectors < 100 ||
- p->firstSector == 0) {
- // not a valid partition
- return false;
- }
- volumeStartBlock = p->firstSector;
- }
- if (!cacheRawBlock(volumeStartBlock, CACHE_FOR_READ)) return false;
- bpb_t* bpb = &cacheBuffer_.fbs.bpb;
- if (bpb->bytesPerSector != 512 ||
- bpb->fatCount == 0 ||
- bpb->reservedSectorCount == 0 ||
- bpb->sectorsPerCluster == 0) {
- // not valid FAT volume
- return false;
- }
- fatCount_ = bpb->fatCount;
- blocksPerCluster_ = bpb->sectorsPerCluster;
-
- // determine shift that is same as multiply by blocksPerCluster_
- clusterSizeShift_ = 0;
- while (blocksPerCluster_ != (1 << clusterSizeShift_)) {
- // error if not power of 2
- if (clusterSizeShift_++ > 7) return false;
- }
- blocksPerFat_ = bpb->sectorsPerFat16 ?
- bpb->sectorsPerFat16 : bpb->sectorsPerFat32;
-
- fatStartBlock_ = volumeStartBlock + bpb->reservedSectorCount;
-
- // count for FAT16 zero for FAT32
- rootDirEntryCount_ = bpb->rootDirEntryCount;
-
- // directory start for FAT16 dataStart for FAT32
- rootDirStart_ = fatStartBlock_ + bpb->fatCount * blocksPerFat_;
-
- // data start for FAT16 and FAT32
- dataStartBlock_ = rootDirStart_ + ((32 * bpb->rootDirEntryCount + 511)/512);
-
- // total blocks for FAT16 or FAT32
- uint32_t totalBlocks = bpb->totalSectors16 ?
- bpb->totalSectors16 : bpb->totalSectors32;
- // total data blocks
- clusterCount_ = totalBlocks - (dataStartBlock_ - volumeStartBlock);
-
- // divide by cluster size to get cluster count
- clusterCount_ >>= clusterSizeShift_;
-
- // FAT type is determined by cluster count
- if (clusterCount_ < 4085) {
- fatType_ = 12;
- } else if (clusterCount_ < 65525) {
- fatType_ = 16;
- } else {
- rootDirStart_ = bpb->fat32RootCluster;
- fatType_ = 32;
- }
- return true;
-}
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