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108 lines
3.7 KiB
108 lines
3.7 KiB
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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#include "../../../libs/W25Qxx.h"
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#define HAS_SPI_FLASH_COMPRESSION 1
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/**
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* This class manages and optimizes SPI Flash data storage,
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* keeping an internal buffer to write and save full SPI flash
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* pages as needed.
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*
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* Since the data is always in the buffer, the class is also
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* able to support fast on-the-fly RLE compression/decompression.
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*
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* In testing with the current LVGL_UI it compacts 2.9MB of icons
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* (which have lots of runs) down to 370kB!!! As a result the UI
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* refresh rate becomes faster and now all LVGL UI can fit into a
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* tiny 2MB SPI Flash, such as the Chitu Board.
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*
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* == Usage ==
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*
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* Writing:
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*
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* The class keeps an internal buffer that caches data until it
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* fits into a full SPI Flash page. Each time the buffer fills up
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* the page is saved to SPI Flash. Sequential writes are optimal.
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*
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* SPIFlashStorage.beginWrite(myStartAddress);
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* while (there is data to write)
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* SPIFlashStorage.addData(myBuffer, bufferSize);
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* SPIFlashStorage.endWrite(); // Flush remaining buffer data
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*
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* Reading:
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*
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* When reading, it loads a full page from SPI Flash at once and
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* keeps it in a private SRAM buffer. Data is loaded as needed to
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* fullfill requests. Sequential reads are optimal.
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*
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* SPIFlashStorage.beginRead(myStartAddress);
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* while (there is data to read)
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* SPIFlashStorage.readData(myBuffer, bufferSize);
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*
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* Compression:
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*
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* The biggest advantage of this class is the RLE compression.
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* With compression activated a second buffer holds the compressed
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* data, so when writing data, as this buffer becomes full it is
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* flushed to SPI Flash.
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*
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* The same goes for reading: A compressed page is read from SPI
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* flash, and the data is uncompressed as needed to provide the
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* requested amount of data.
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*/
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class SPIFlashStorage {
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public:
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// Write operation
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static void beginWrite(uint32_t startAddress);
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static void endWrite();
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static void writeData(uint8_t *data, uint16_t size);
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// Read operation
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static void beginRead(uint32_t startAddress);
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static void readData(uint8_t *data, uint16_t size);
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static uint32_t getCurrentPage() { return m_currentPage; }
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private:
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static void flushPage();
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static void savePage(uint8_t *buffer);
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static void loadPage(uint8_t *buffer);
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static void readPage();
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static uint16_t inData(uint8_t *data, uint16_t size);
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static uint16_t outData(uint8_t *data, uint16_t size);
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static uint8_t m_pageData[SPI_FLASH_PageSize];
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static uint32_t m_currentPage;
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static uint16_t m_pageDataUsed;
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static inline uint16_t pageDataFree() { return SPI_FLASH_PageSize - m_pageDataUsed; }
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static uint32_t m_startAddress;
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#if HAS_SPI_FLASH_COMPRESSION
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static uint8_t m_compressedData[SPI_FLASH_PageSize];
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static uint16_t m_compressedDataUsed;
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static inline uint16_t compressedDataFree() { return SPI_FLASH_PageSize - m_compressedDataUsed; }
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#endif
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};
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extern SPIFlashStorage SPIFlash;
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