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Kamil Duljas
Senior III
April 28, 2023
Solved

STM32CubeMX bug: Wrong ADC resolution for STM32L476

  • April 28, 2023
  • 6 replies
  • 2204 views

Hi,

I notice that CubeMx allow choose 16-bit resolution but STM32L476 has range from 6 to 12 bit.


_legacyfs_online_stmicro_images_0693W00000bj2D5QAI.png 

When I generate code I can't compile it:


_legacyfs_online_stmicro_images_0693W00000bj2ESQAY.png
_legacyfs_online_stmicro_images_0693W00000bj283QAA.pngMoreover in datasheet we read on page 1:


_legacyfs_online_stmicro_images_0693W00000bj2EwQAI.png 

but it's only one information about mystic 16-bit resolution :D

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Best answer by Kamil Duljas

Pleas look at my first post. CubeMx generate ADC_RESOLUTION_16B that not exist in ADC header for this board .

https://github.com/STMicroelectronics/STM32CubeL4/blob/e691a513a48d0014f201ce35a265cbfca446396d/Drivers/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_adc.h#L465

6 replies

Peter BENSCH
Peter BENSCH
ST Technical Moderator
April 28, 2023

Well, we are talking about a 12-bit ADC with hardware oversampling.

In the generated code you will find at the very bottom: hadc1.Init.OversamplingMode = DISABLE;, which is set by the CubeMX setting in "ADC_Regular_ConversionMode". You will get 16bit oversampling when enabled.

Does it answer your question?

Regards

/Peter

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Kamil DuljasAuthor
Senior III
April 28, 2023

I don't think so. CubeMx should not generate code that you can't compile it​

Dudo
Peter BENSCH
Peter BENSCH
ST Technical Moderator
April 28, 2023

What does the ability to compile have to do with 16-bit oversampling?

Can't you compile the code?

Do you know how 16-bit oversampling works?

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Imen.D
ST Technical Moderator
May 2, 2023

Hello All,

Issue confirmed and an internal ticket (ID 150960) is submitted in order to fix this.

(PS: ID 150960 is an internal tracking number and is not accessible or usable by customers).

Thank you for your contribution.

Imen

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