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EthanMankins
Senior
December 4, 2024
Solved

FATFS + RTOS + touchgfx

  • December 4, 2024
  • 6 replies
  • 1536 views

I have a working project that simply writes to a a file on an SD card (Using STM32H7B3I-DK, Not Using RTOS).

When I add it to a touchgfx project, f_mount() and f_open() return NO_FILE_SYSTEM. This happens even after f_mkfs() returns FR_OK. I have the following parameters:

  • Freertos - task : stack 512 (words)  Priority : osPriorityRealtime
  • Project manage - linker settings Minimum Heap Size : 0x1000
  • Project manage - linker settings Maximum Heap Size  : 0x1000
  • FATFS - SDMMC instance : SDMMC1 Use DMA template - Enabled
  • SDMMC1 - Use clock divide factor : 2

There is no DMA Settings tab in SDMMC1, is this an issue?

EDIT: I have tried it with just RTOS and FATFS and It works... The issue occurs when touchgfx is in the project

This topic has been closed for replies.
Best answer by EthanMankins

@GaetanGodart , @Andrew Neil 

I discovered that the issue was occurred only when touchGFX was part of the project. I found another post and copied in their solution and It works:

 MPU_InitStruct.Number = MPU_REGION_NUMBER3;
 MPU_InitStruct.BaseAddress = 0x24000000;
 MPU_InitStruct.Size = MPU_REGION_SIZE_512KB;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;

 Why this is the issue? I don't know.

Could you explain how this was causing a NO_FILE_SYSTEM error in FATFS?

6 replies

Andrew Neil
Andrew Neil
Super User
December 4, 2024

Don't forget to mark the solution on your previous thread:

https://community.st.com/t5/stm32-mcus-embedded-software/fatfs-failure-with-freertos/td-p/750161

 

@EthanMankins wrote:

f_mount() and f_open() return NO_FILE_SYSTEM. 

So step into those functions and see why they do that.

Compare & contrast with your working version ...

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
EthanMankinsAuthor
Senior
December 4, 2024

@Andrew Neil , sorry forgot to mark prev thread...

The code I put in regard SD card is the same, the only difference is the new one has RTOS.

I have found  a very weird behavior. If I place a breakpoint on the following line in find_volume() and then click resume once it hits it, f_mount() works fine:

(line 3060) fmt = bsect ? check_fs(fs, bsect) : 3;	/* Check the partition */

This makes me think there's some sort of timing issue... not sure how to fix it though since I have already given this task Realtime priority

Andrew Neil
Andrew Neil
Super User
December 5, 2024
@EthanMankins wrote:

This makes me think there's some sort of timing issue... 

Indeed.

 

@EthanMankins wrote:

not sure how to fix it though since I have already given this task Realtime priority

But the fact that a breakpoint "fixes" it suggests that the problem is with going too fast - not too slow.

Instrument the code so that you what's happening - in both cases.

Do you have a logic analyser to see what's actually happening on the wires?

 

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
EthanMankinsAuthorBest answer
Senior
December 5, 2024

@GaetanGodart , @Andrew Neil 

I discovered that the issue was occurred only when touchGFX was part of the project. I found another post and copied in their solution and It works:

 MPU_InitStruct.Number = MPU_REGION_NUMBER3;
 MPU_InitStruct.BaseAddress = 0x24000000;
 MPU_InitStruct.Size = MPU_REGION_SIZE_512KB;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;

 Why this is the issue? I don't know.

Could you explain how this was causing a NO_FILE_SYSTEM error in FATFS?

GaetanGodart
GaetanGodart
ST Employee
December 9, 2024

Hello @EthanMankins ,

 

I am glad you found a solution!

I am not an expert at FATFS but I assume that TouchGFX changes the MPU settings and that FATFS require specific MPU settings that got changed by the TouchGFX TBS setup.

 

Regards,

Gaetan GodartSoftware engineer at ST (TouchGFX)
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