LPC MicrocontrollersのトピックLittlefs LPCXpresso55S16

Littlefs LPCXpresso55S16

ahmed007 — Mon, 12 Jun 2023 15:07:38 GMT

Hello community! I'm working on a project with the LPCXpresso55S16 microcontroller and I'm using the Littelfs project for managing data storage in the flash memory. I would like to know if anyone has experience with creating, writing, and reading data using Littelfs on this specific microcontroller. Could you share an example or provide any guidance on how to accomplish this? Any help would be greatly appreciated. Thank you!

Ahmed,

Re: Littlefs LPCXpresso55S16

ErichStyger — Mon, 12 Jun 2023 17:06:31 GMT

Hi @ahmed007 ,

yes, we used LittleFS with the LPC55S16 in different projects (one I have described in https://mcuoneclipse.com/2021/12/30/lorawan-with-nxp-lpc55s16-and-arm-cortex-m33/). For space (data amount) reasons we mostly used an external flash device (Winbond in that case) with it, but we used as well MinINI and LittleFS usint the internal FLASH memory for others.

The Flash memory of the LPC55x is somewhat 'special', but we have covered that with the McuFlash module in these projects which works for other devices too. The McuFlash module implements the block device used by all the different file systems (MinINI, LittleFS, FatFS (https://mcuoneclipse.com/2021/05/15/using-fatfs-and-minini-with-the-nxp-lpc55s16-evk/)) we are using.

I recommend you have a look at the above article/projects (link to Github is in the article).

I hope this helps,

Erich

Re: Littlefs LPCXpresso55S16

ahmed007 — Mon, 19 Jun 2023 09:32:54 GMT

Dear Erich,

I appreciate your kind gesture of sharing those valuable links. After thoroughly reviewing your LoRa project, I have some concerns. I couldn't locate the McuFlash API code for reading and writing to the flash. Additionally, I noticed that you opted for minINI instead of littlefs.

If you happen to have another example that includes a straightforward McuFlash API and utilizes littlefs, I would be delighted if you could share it with me.

Thank you.

Best regards,

Ahmed

Re: Littlefs LPCXpresso55S16

ErichStyger — Mon, 19 Jun 2023 12:36:06 GMT

Hi @ahmed007 ,

you can find the McuFlash module here:

https://github.com/ErichStyger/mcuoneclipse/blob/master/Examples/MCUXpresso/McuLib/src/McuFlash.c

Erich

Re: Littlefs LPCXpresso55S16

ErichStyger — Mon, 19 Jun 2023 14:59:08 GMT

Hi @ahmed007 ,

The example on GitHub (https://github.com/ErichStyger/mcuoneclipse/tree/master/Examples/MCUXpresso/LPC55S16-EVK/LPC55S16_Blinky ) provides all kind of file system support.

It is just a matter of configuration and what you want. I have just pushed an update on GitHub and configured it to use LittleFS with the internal FLASH (32 blocks at 0x200 each). Please check it out, it is very generic and configurable. Below is an example LittleFS session with formatting and mounting a device, and then operating on to the file system:

This all can be combined with minINI and FatFS (external SD card) as well, so please have a look at the example.

I hope this helps,

Erich

Re: Littlefs LPCXpresso55S16

ahmed007 — Mon, 19 Jun 2023 15:12:17 GMT

Hi @ErichStyger ,

Thank you very much for your efforts, Erich! Thank you for your contribution and the valuable resources you've provided. Your efforts are greatly appreciated!

Best regards,

Ahmed

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 12:23:10 GMT

Hi @ErichStyger ,

I want to express my gratitude for your tremendous support. After carefully studying and attempting the example you provided, I regret to inform you that the code did not successfully mount the LittleFS on the LPCXpresso55S16. Unfortunately, I encountered the same error as in my previous code.

The issue arises when the lfs_mount function returns a result of -84. This particular result is derived from the following line of code:

lfs_stag_t tag = lfs_dir_fetchmatch(lfs, &dir, dir.tail, LFS_MKTAG(0x7ff, 0x3ff, 0), LFS_MKTAG(LFS_TYPE_SUPERBLOCK, 0, 8), NULL, lfs_dir_find_match, &(struct lfs_dir_find_match){ lfs, "littlefs", 8});

Upon debugging, I discovered that the generated tag inside the above function is considered invalid, leading to the function returning -84. This invalidity is caused by a corrupted directory pair.

To provide further context, I have shared my code at the following GitHub link: https://github.com/ahmedbouzid07/littlefs_lpcxpresso55s16/tree/master/lpcxpresso55s16_flashiap1

I have removed multiple configuration files from your code, as I will solely be working with LPCXpresso55S16. Consequently, there is no need to utilize preprocessors, and I have also omitted the shell part.

If you have the time and willingness, I would greatly appreciate your assistance in finding a solution to this predicament.

Thank you very much for your valuable support.

Re: Littlefs LPCXpresso55S16

ErichStyger — Wed, 21 Jun 2023 12:53:50 GMT

Hi @ahmed007 ,

Just to check: have you tried my example 'as is' without modifications, as that works fine on my side.

Did you format your storage area first, as outlined in my terminal screenshot? Do not remove or change anything, unless you know what you are doing. The Shell support is there for a reason.

Just in case, I have attached you the binary files I'm using with my board/system.

I hope this helps,

Erich

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 12:57:07 GMT

hi @ErichStyger ,

Yes I tried and I got like this :

in the rawformat function, the lfs_dir_commit function returns an error.

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 13:01:42 GMT

Hi @ErichStyger

Actually, I did but I got multiple errors and one of them is in the McuLib.h returns that I have these files missed. I tried to locate them but I didn't find them.

/* Include shared modules, which are used for the whole project */

#include "PE_Types.h"

#include "PE_Error.h"

#include "PE_Const.h"

#include "IO_Map.h"

#include "Cpu.h" /* include CPU related interfaces and defines */

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 13:04:07 GMT

Hi @ErichStyger

Another question, Could you give me how to open an interactive terminal with the board? Since I know how to open a serial terminal with the MCUXpresso IDE terminal feature. I tried to open a serial terminal with Putty and I choose the right COM but didn't succeed.

Re: Littlefs LPCXpresso55S16

ErichStyger — Wed, 21 Jun 2023 13:05:57 GMT

Hi @ahmed007 ,

Your screenshot shows me that you are not using the example I have provided, but your own (modified) one.

Please try first with my full example.

Erich

Re: Littlefs LPCXpresso55S16

ErichStyger — Wed, 21 Jun 2023 13:08:30 GMT

Hi @ahmed007 ,

please use my example, as it has all the settings set in a correct way. The McuLib is just one directory level up, as you can see in the project (linked folder).

If you are unfamiliar with git: simply get the full repository as zip file, then load the project after unzipping the repository.

Erich

Re: Littlefs LPCXpresso55S16

ErichStyger — Wed, 21 Jun 2023 13:10:29 GMT

The LPC55S16 LinkServer debug firmware comes with a VCOM port. The application is using that UART to VCOM.

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 13:16:05 GMT

Hi @ErichStyger,

Are you talking about this example: https://github.com/ErichStyger/mcuoneclipse/tree/master/Examples/MCUXpresso/LPC55S16-EVK/LPC55S16_Blinky/source.

If so I think it uses FatFs and minINI and use LittleFS to program the SD card, not the on-chip flash.

Should I try first as it is?

Ahmed.

Re: Littlefs LPCXpresso55S16

ErichStyger — Wed, 21 Jun 2023 13:34:14 GMT

Hi @ahmed007 ,

short answer: yes.

longer answer: that example includes both FatFS (with SD card) and littleFS (using on-chip Flash). And yes, it supports as well MinINI for both.

Erich

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 14:19:28 GMT

Hello, Erich Styger!

I want to express my gratitude for your valuable support. I'm pleased to inform you that the example you provided is functioning smoothly on the board. The littlefs has been successfully mounted, allowing us to both write and read files.

I would like to inquire whether you suggest making modifications to your example to align with my specific requirements. In my project, I intend to automate the tasks and refrain from opening a UART terminal on the LPCXpresso. Therefore, it is essential for the file system to be mounted automatically.

Thank you once again for your assistance.

Best regards, Ahmed

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 14:31:41 GMT

Hi @ErichStyger ,

Thank you for being so supportive. I kindly request your guidance in locating the section where the short names of commands are defined and assigned to their respective functions.

Thank you in advance for your assistance.

Best regards, Ahmed

Re: Littlefs LPCXpresso55S16

ErichStyger — Wed, 21 Jun 2023 14:51:01 GMT

Hi @ahmed007 ,

I'm sorry, but I think I don't understand what you are talking about?

But just in case: you have all the source files and code, so you should be able to see how it works?

Erich

Re: Littlefs LPCXpresso55S16

ahmed007 — Wed, 21 Jun 2023 15:05:24 GMT

Hi @ErichStyger ,

For example, to list directory files or to write binaries to a file we used short commands like ls, or bincat, but these names are not function names, so I thought that we are assigned to this abbreviation like ls the function McuLFS_FileList. I make a small search if there is a file where you assign command names to function but I didn't find anything, that's what I am asking about.

Ahmed,