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Tiboww
Associate II
October 16, 2024
Question

Using pre-programmed bootloader on STM32G0B0RE

  • October 16, 2024
  • 16 replies
  • 6577 views

hello

I am developping on a STM32G0B0RE, I've learned after finishing my board and everything that boot pin can be used by default.

It is not a problem since I have ST-Link for production but I would like to be able to do firmware update through bootloader.

 

The issue is, since nBOOT_SEL is set to '1' by default I need to change it to 0 so I go in bootloader if my pin PA14-BOOT0 is tied up at startup. I find how to change it in STM32CubeProgrammer but I would like to do it in my firmware so the flashing process is not too complicated in factory.

 

I've tried this but it does not have any effect : 

Tiboww_0-1729088556950.png

Best Regards

Thibaud HABRAND

This topic has been closed for replies.

16 replies

mƎALLEm
mƎALLEm
ST Technical Moderator
October 16, 2024

Hello @Tiboww and welcome to the community,

Using user option byte:

SofLit_0-1729094824462.png

Refer to the RM0444 / 2.5 Boot configuration

 

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TibowwAuthor
Associate II
October 17, 2024

Hello

I know this table, as I said I've been able de modify "nBOOT_SEL" bit in the STM32CubeProgrammer but I would like to implement it in my firmware. So they only need to flash a firmware in factory. 

I am developping on STM32CubeIDE v1.16.0, I tried to use the function "HAL_FLASHEx_OBGetConfig". Can you tell me if I am using this function wrong or I have to do an other way ? 

Best Regards

Thibaud HABRAND

TibowwAuthor
Associate II
October 22, 2024

Hello 

 

@mƎALLEm Do you have any update on my case ?

 

Best Regards

Thibaud HABRAND

Shirley.Ye
Shirley.Ye
ST Employee
October 22, 2024

ShirleyYe_0-1729583993151.png

D you mean you cannot change your "nBOOT_SEL" bit from 1 to 0 by the function HAL_FLASHEx_OBProgram?

please note:

New option bytes configuration will be taken into account in two cases:
* - after an option bytes launch through the call of @ref HAL_FLASH_OB_Launch()
* - after a power reset (BOR reset or exit from Standby/Shutdown modes) 

TibowwAuthor
Associate II
October 22, 2024

Hello

I've tried to add HAL_FLASH_OB_Launch() : 

Tiboww_2-1729606178517.png Tiboww_1-1729606143898.png

Tiboww_3-1729606242296.png Tiboww_4-1729606264366.png

Tiboww_5-1729606297463.png Tiboww_6-1729606314161.png

 

 

I didi'nt tried power reset because when I do programm then get it seems like the modification didn't do anything in the register and it changed only my local structure.

BR 

Thibaud

 

 

 

 

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