Is this a bug in the HAL library about smbus?

[one V]

[Imen.D]

Hello,

Which CubeMx and Cube package versions used ?

I cannot reproduce this issue. Can you please share your ioc file for check.

Kind Regards,

Imen

[one V]

[Imen.D]

Hi,

After more check, I confirm that the problem exists for hdmarx and hdmatx with I2C4.

I transfer this issue to developer team for fix.

Thanks for your contribution.

Thanks,

Imen

[one V]

By the way, i2c4 can read external device data, but the i2c+BMDA method does not work. How to solve it?

[Nesrine.JLASSI]

Hi @one V​ 

Thanks for the feedback.

It will be corrected in the next STM32CubeMX version .

Regards,

Nesrine

[one V]

So, the code generated by STM32CUBEMX(5.0.1) in I2C4+BDMA mode is not working now?

[Nesrine.JLASSI]

​Hi @one V​ 

DMA requests should not be used when I2C mode is set to one of the SMBUS modes.

That will be corrected in the next STM32CubeMX version.

Regards,

Nesrine

[one V]

Thank you for your reply.

However, I2C mode does not seem to work, can you test it?

[Nesrine.JLASSI]

Hi @one V​ 

In STM32Cube_FW_H7_V1.3.2\Drivers\STM32H7xx_HAL_Driver\Inc path.

In the typedef struct __I2C_HandleTypeDef of stm32h7xx_hal_i2c.h file, you will find :

DMA_HandleTypeDef      *hdmatx;    

DMA_HandleTypeDef      *hdmarx;     

but it isn't available in stm32h7xx_hal_smbus.h

So, when I2C mode is set to one of the SMBUS modes as shown in this figure:

The DMA Tab must be removed when I2C is set to SMBUS mode .

==> This problem only exists for I2C4.

This bug will be fixed in the next STM32CubeMX version ( STM32CubeMX 5.1: That will be available Week 9 ).

Regards,

Nesrine.

[one V]

No, no. I already know what you said, and this is why I reported the bug to you. I want to ask is the I2C(i2c+BDMA) mode working properly?

[Nesrine.JLASSI]

​Hi @one V​ 

No problem when using the I2C (I2C + BDMA) mode as long as there is the definition of hdmatx and hdmarx in the stm32h7xx_hal_i2c.h file.

Regards,

Nesrine.

[one V]

Yes, the generated code will not report an error, which I also know. But what I mean is, have you actually measured it available?

Thank you again for your answer.