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100 lines
2.9 KiB
100 lines
2.9 KiB
2 weeks ago
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/*
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* LittleFS block device adapter for W25QXX SPI Flash
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*
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* Maps littlefs read/prog/erase/sync callbacks to the W25QXX driver:
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* read -> W25QXX_Read
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* prog -> W25QXX_Write_NoCheck (littleFS guarantees erase-before-prog)
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* erase -> W25QXX_Erase_Sector (4 KiB sector)
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* sync -> W25QXX_Wait_Busy
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*/
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#ifndef LFS_FLASHBD_H
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#define LFS_FLASHBD_H
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#include "lfs.h"
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#include "lfs_util.h"
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* W25QXX 扇区大小固定为 4096 字节 */
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#define LFS_FLASHBD_SECTOR_SIZE 4096
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/* Flash 块设备配置 */
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struct lfs_flashbd_config {
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/* Flash 起始偏移地址（字节），必须 4096 对齐 */
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uint32_t base_addr;
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/* 使用的块（扇区）数量 */
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uint32_t block_count;
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};
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/* Flash 块设备状态 */
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typedef struct lfs_flashbd {
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const struct lfs_flashbd_config *cfg;
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} lfs_flashbd_t;
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/* 初始化块设备（内部调用 W25QXX_Init） */
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int lfs_flashbd_create(const struct lfs_config *cfg,
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const struct lfs_flashbd_config *bdcfg);
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/* 销毁块设备（当前为空操作） */
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int lfs_flashbd_destroy(const struct lfs_config *cfg);
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/* 读取一个块的区域 */
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int lfs_flashbd_read(const struct lfs_config *cfg, lfs_block_t block,
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lfs_off_t off, void *buffer, lfs_size_t size);
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/* 编程一个块的区域（块必须已擦除） */
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int lfs_flashbd_prog(const struct lfs_config *cfg, lfs_block_t block,
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lfs_off_t off, const void *buffer, lfs_size_t size);
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/* 擦除一个块（4 KiB 扇区） */
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int lfs_flashbd_erase(const struct lfs_config *cfg, lfs_block_t block);
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/* 同步块设备（等待 Flash 空闲） */
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int lfs_flashbd_sync(const struct lfs_config *cfg);
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/*
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* 便捷函数：用 W25QXX 默认参数填充 lfs_config 和 flashbd 配置。
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*
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* 调用者需提供 lfs_config、lfs_flashbd_t、lfs_flashbd_config 结构体
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* （可以是在栈上或静态分配），以及 Flash 起始地址和使用的块数量。
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*
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* 如果 read_buffer / prog_buffer / lookahead_buffer 为 NULL，
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* littleFS 会通过 lfs_malloc 动态分配缓存。
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* 静态 lookahead_buffer 大小需 >= lookahead_size = ceil(block_count / 8) 字节。
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*
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* 典型用法（W25Q80，从地址 0 开始使用全部 1 MB）：
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*
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* lfs_t lfs;
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* lfs_flashbd_t bd;
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* struct lfs_flashbd_config bd_cfg;
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* struct lfs_config cfg;
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* uint8_t read_buf[256], prog_buf[256], lookahead_buf[32]; // 256 块 -> 32 字节
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*
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* lfs_flashbd_default_config(&cfg, &bd, &bd_cfg, 0, 256,
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* read_buf, prog_buf, lookahead_buf);
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* lfs_format(&lfs, &cfg); // 首次使用需格式化
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* lfs_mount(&lfs, &cfg);
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*/
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void lfs_flashbd_default_config(
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struct lfs_config *cfg,
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lfs_flashbd_t *bd,
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struct lfs_flashbd_config *bdcfg,
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uint32_t base_addr,
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uint32_t block_count,
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void *read_buffer,
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void *prog_buffer,
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void *lookahead_buffer);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* LFS_FLASHBD_H */
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