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reflow doc comments
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@ -5,17 +5,18 @@
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//! There are, broadly speaking, three different kinds of save media that can be
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//! found in official Game Carts:
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//!
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//! * Battery-Backed SRAM: The simplest kind of save media, which can be accessed
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//! like normal memory. You can have SRAM up to 32KiB, and while there exist a
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//! few variants this does not matter much for a game developer.
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//! * Battery-Backed SRAM: The simplest kind of save media, which can be
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//! accessed like normal memory. You can have SRAM up to 32KiB, and while
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//! there exist a few variants this does not matter much for a game developer.
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//! * EEPROM: A kind of save media based on very cheap chips and slow chips.
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//! These are accessed using a serial interface based on reading/writing bit
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//! streams into IO registers. This memory comes in 8KiB and 512 byte versions,
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//! which unfortunately cannot be distinguished at runtime.
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//! * Flash: A kind of save media based on flash memory. Flash memory can be read
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//! like ordinary memory, but writing requires sending commands using multiple
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//! IO register spread across the address space. This memory comes in 64KiB
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//! and 128KiB variants, which can thankfully be distinguished using a chip ID.
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//! streams into IO registers. This memory comes in 8KiB and 512 byte
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//! versions, which unfortunately cannot be distinguished at runtime.
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//! * Flash: A kind of save media based on flash memory. Flash memory can be
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//! read like ordinary memory, but writing requires sending commands using
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//! multiple IO register spread across the address space. This memory comes in
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//! 64KiB and 128KiB variants, which can thankfully be distinguished using a
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//! chip ID.
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//!
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//! As these various types of save media cannot be easily distinguished at
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//! runtime, the kind of media in use should be set manually.
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//!
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//! ## Using save media
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//!
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//! To access save media, use the [`SaveManager::access`] or [`SaveManager::access_with_timer`] methods to create a new
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//! [`SaveData`] object. Its methods are used to read or write save media.
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//! To access save media, use the [`SaveManager::access`] or
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//! [`SaveManager::access_with_timer`] methods to create a new [`SaveData`]
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//! object. Its methods are used to read or write save media.
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//!
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//! Reading data from the savegame is simple. Use [`read`] to copy data from an
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//! offset in the savegame into a buffer in memory.
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//!
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//! Writing to save media requires you to prepare the area for writing by calling
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//! the [`prepare_write`] method to return a [`SavePreparedBlock`], which contains
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//! the actual [`write`] method.
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//! Writing to save media requires you to prepare the area for writing by
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//! calling the [`prepare_write`] method to return a [`SavePreparedBlock`],
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//! which contains the actual [`write`] method.
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//!
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//! The `prepare_write` method leaves everything in a sector that overlaps the
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//! range passed to it in an implementation defined state. On some devices it may
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//! do nothing, and on others, it may clear the entire range to `0xFF`.
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//! range passed to it in an implementation defined state. On some devices it
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//! may do nothing, and on others, it may clear the entire range to `0xFF`.
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//!
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//! Because writes can only be prepared on a per-sector basis, a clear on a range
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//! of `4000..5000` on a device with 4096 byte sectors will actually clear a range
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//! of `0..8192`. Use [`sector_size`] to find the sector size, or [`align_range`]
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//! to directly calculate the range of memory that will be affected by the clear.
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//! Because writes can only be prepared on a per-sector basis, a clear on a
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//! range of `4000..5000` on a device with 4096 byte sectors will actually clear
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//! a range of `0..8192`. Use [`sector_size`] to find the sector size, or
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//! [`align_range`] to directly calculate the range of memory that will be
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//! affected by the clear.
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//!
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//! [`read`]: SaveData::read
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//! [`prepare_write`]: SaveData::prepare_write
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//! * Atmel flash chips have a sector size of 128 bytes. Reads to any alignment
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//! are efficient, however, unaligned writes are extremely slow.
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//! `prepare_write` does not immediately erase any data.
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//! * EEPROM has a sector size of 8 bytes. Unaligned reads and writes are
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//! slower than aligned writes, however, this is easily mitigated by the
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//! small sector size.
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//! * EEPROM has a sector size of 8 bytes. Unaligned reads and writes are slower
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//! than aligned writes, however, this is easily mitigated by the small sector
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//! size.
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use crate::save::utils::Timeout;
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use crate::sync::{Mutex, RawMutexGuard};
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