Revision as of 19:04, 19 August 2022

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 ===[[Getting Started with STM32]]===
 ===[[STM32 - Using DMA for Serial Receive]]===
-=LittleFS Flash File System=
+===[[STM32 - LittleFS Flash File System Interfacing]]===
-In the Embedded world, LittleFS is quickly being adopted as the Embedded filesystem of choice.<br>
-Although SpiFFS, has held that position for many years, it is no longer being maintained, while LittleFS is quickly being adopted.<br>
-LittleFS appears to be even more compact and has additional security in that it creates and maintains a CRC for each file, and verifies the CRC each time the file is read.
-* Compact
-* Power-loss resilience
-* Dynamic wear leveling
-* Bounded RAM/ROM
-* Maintains revision count and CRC (security features)
-* Well documented and available on GitHub: https://github.com/littlefs-project/littlefs
-==The Hardware==
-Using only a NUCLEO-F103RB.  (Allocated the last 32K of program FLASH memory for LittleFS)<br>
-==The Software==
- LittleFS requires three functions to interact with the FLASH memory:
-) ReadFlash
-) WriteFlash
-) EraseFlash
- LittleFS requires a configuration data structure filled out so it knows about the FLASH
- and some rather small RAM buffers.
-) Its smallest erasable sector size
-) The smallest block size it can read
-) The smallest block size it can write
- It will also need some rather small RAM buffers
- I put all my interface code into a separate file, littlefs_interface.c.
- It includes:
- lfs_read()  - function to read STM32F103RB FLASH memory
- lfs_prog()  - function to program / write STM32F103RB FLASH memory
- lfs_erase() - function to erase a STM32F103RB FLASH memory sector
- lfs_sync()  - synchronization function - stub
- struct lfs_config lfs_cfg; - filled out defining the flash, buffers, and access functions
-==Command Line Functions==
- Since I enjoy using a command line interface, additional functions are included:
- int cl_dir(void);       - Display a file system directory
- int cl_make_dir(void);  - Make a test directory
- int cl_remove(void);    - Remove a file / directory
- int cl_make_file(void); - Make a test file
- int cl_cat(void);       - Display a file
- int cl_file_dump(void); - Hexadecimal dump of the file contents
- int cl_copy(void);      - File copy
- int cl_rename(void);    - File / directory rename
- ... plus a few other test functions
 ===[[STM32 - How To]]===
 ===[[1.3" Color LCD Display "shield" for Raspberry Pi Pico]]===

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