74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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* Copyright (C) EdgeTX
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*
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* Based on code named
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* opentx - https://github.com/opentx/opentx
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* th9x - http://code.google.com/p/th9x
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* er9x - http://code.google.com/p/er9x
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* gruvin9x - http://code.google.com/p/gruvin9x
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*
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* License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
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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 version 2 as
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* published by the Free Software Foundation.
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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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#pragma once
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#include "hal/fatfs_diskio.h"
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// tunable parameters
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#if !defined(DISK_CACHE_BLOCKS_NUM)
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#define DISK_CACHE_BLOCKS_NUM 32 // no cache blocks
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#endif
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#if !defined(DISK_CACHE_BLOCK_SECTORS)
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#define DISK_CACHE_BLOCK_SECTORS 16 // no sectors
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#endif
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struct DiskCacheStats
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{
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uint32_t noHits;
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uint32_t noMisses;
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uint32_t noWrites;
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};
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class DiskCacheBlock;
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class DiskCache
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{
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public:
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DiskCache();
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void initialize(const diskio_driver_t* drv);
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void clear();
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DRESULT read(BYTE drv, BYTE* buff, DWORD sector, UINT count);
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DRESULT write(BYTE drv, const BYTE* buff, DWORD sector, UINT count);
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const DiskCacheStats& getStats() const;
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int getHitRate() const;
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private:
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DiskCacheStats stats;
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uint32_t lastBlock;
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DiskCacheBlock* blocks;
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const diskio_driver_t* diskDrv;
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uint32_t sectors;
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uint32_t getSectors(uint8_t lun);
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};
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extern DiskCache diskCache;
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DRESULT disk_cache_read(BYTE drv, BYTE* buff, DWORD sector, UINT count);
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DRESULT disk_cache_write(BYTE drv, const BYTE* buff, DWORD sector, UINT count);
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