1.下载源码
在github下载littlefs
littlefs-project/littlefs: A little fail-safe filesystem designed for microcontrollers
2.添加源码到工程
将四个文件加入工程lfs.c，lfs.h,lfs_util.c,lfs_util.h
修改lfs_util.h：
替换MALLOC和Free函数接口，由c库函数更改为freertos对应函数，及添加断言以便debug
index c1999fa..9dd9765 100644
--- a/Lib/littlefs/lfs_util.h
+++ b/Lib/littlefs/lfs_util.h
@@ -43,7 +43,7 @@
#include <stdbool.h>
#include <string.h>
#include <inttypes.h>
-
+#include "FreeRTOS.h"
#ifndef LFS_NO_MALLOC
#include <stdlib.h>
#endif
@@ -68,6 +68,7 @@ extern "C"
// code footprint
// Logging functions
+#define LFS_YES_TRACE
#ifndef LFS_TRACE
#ifdef LFS_YES_TRACE
#define LFS_TRACE_(fmt, ...) \
@@ -113,6 +114,13 @@ extern "C"
#ifndef LFS_NO_ASSERT
#define LFS_ASSERT(test) assert(test)
#else
+#define assert(x) \
+ if ((x) == 0) \
+ { \
+ __asm volatile("ebreak"); \
+ for (;;) \
+ ; \
+ }
#define LFS_ASSERT(test)
#endif
#endif
@@ -246,7 +254,9 @@ static inline void *lfs_malloc(size_t size) {
#if defined(LFS_MALLOC)
return LFS_MALLOC(size);
#elif !defined(LFS_NO_MALLOC)
- return malloc(size);
+// return malloc(size);
+ extern void *pvPortMalloc( size_t xWantedSize );
+ return pvPortMalloc(size);
#else
(void)size;
return NULL;
@@ -258,7 +268,9 @@ static inline void lfs_free(void *p) {
#if defined(LFS_FREE)
LFS_FREE(p);
#elif !defined(LFS_NO_MALLOC)
- free(p);
+// free(p);
+ extern void vPortFree( void *pv );
+ vPortFree(p);
#else
(void)p;
#endif
3.新建lfs_port.c
重写cfg中，read，prog，erase，sync函数,本文默认设置为静态内存
#define OFFSETBLOCK 3
/**
* lfs与底层flash读数据接口
* @param c
* @param block 块编号
* @param off 块内偏移地址
* @param buffer 用于存储读取到的数据
* @param size 要读取的字节数
* @return
*/
static int lfs_deskio_read(const struct lfs_config *c, lfs_block_t block, lfs_off_t off, void *buffer, lfs_size_t size)
{
if(W25Qx_OK == w25qxx_read((uint8_t *)buffer, c->block_size * (OFFSETBLOCK+block) + off, size))
return LFS_ERR_OK;
else
return LFS_ERR_IO;
}
/**
* lfs与底层flash写数据接口
* @param c
* @param block 块编号
* @param off 块内偏移地址
* @param buffer 待写入的数据
* @param size 待写入数据的大小
* @return
*/
static int lfs_deskio_prog(const struct lfs_config *c, lfs_block_t block, lfs_off_t off, const void *buffer, lfs_size_t size)
{
if(W25Qx_OK == w25qxx_write((uint8_t *)buffer, c->block_size * (OFFSETBLOCK+block) + off, size))
return LFS_ERR_OK;
else
return LFS_ERR_IO;
}
/**
* lfs与底层flash擦除接口
* @param c
* @param block 块编号
* @return
*/
static int lfs_deskio_erase(const struct lfs_config *c, lfs_block_t block)
{
printf("block:%d,i:%d",block,(OFFSETBLOCK+block)*c->block_size);
if(W25Qx_OK == w25qxx_erase_block((OFFSETBLOCK+block)*c->block_size))
// int ret = w25qxx_erase_block((OFFSETBLOCK+block));
return LFS_ERR_OK;
else
return LFS_ERR_IO;
}
static int lfs_deskio_sync(const struct lfs_config *c)
{
if(W25Qx_OK == w25qxx_getstatus())
return LFS_ERR_OK;
else
return LFS_ERR_IO;
}
const struct lfs_config lfs_w25qxx_cfg =
{
// block device operations
.read = lfs_deskio_read,
.prog = lfs_deskio_prog,
.erase = lfs_deskio_erase,
.sync = lfs_deskio_sync,
// block device configuration
.read_size = 256,
.prog_size = 256,
.block_size = 4096,
.block_count = 512,
.cache_size = 256,
.lookahead_size = 128,
.block_cycles = 500,
.name_max=128,
.file_max=128,
.attr_max=128,
.context=512,
// 使用静态内存必须设置这几个缓存
.read_buffer = read_buffer,
.prog_buffer = prog_buffer,
.lookahead_buffer = lookahead_buffer,
};
4.测试
运行环境：stm32f103rct6+freertos+platformio
测试代码：
int lfs_first_run(void){
lfs_t lfs;
lfs_file_t file;
// w25qxx_erase_chip();
// mount the filesystem
int err = lfs_mount(&lfs, &lfs_w25qxx_cfg);
// reformat if we can't mount the filesystem
// this should only happen on the first boot
if (err) {
lfs_format(&lfs, &lfs_w25qxx_cfg);
lfs_mount(&lfs, &lfs_w25qxx_cfg);
}
// 检查剩余空间
int total_blocks = lfs_w25qxx_cfg.block_count;
int used_blocks = lfs_fs_size(&lfs);
int free_blocks = total_blocks - used_blocks;
printf("Free space: %d blocks (%d bytes)\n",
free_blocks, free_blocks * lfs_w25qxx_cfg.block_size);
bytes_to_mb(free_blocks * lfs_w25qxx_cfg.block_size);
}
测试结果，掉电后写入norflash的数据不会丢失：
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版权声明：本文为CSDN博主「rain042233」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/aa25012/article/details/150059509
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