Hi, i want to transform HAL function call 'HAL_I2C_Mem_Read_DMA' and 'Mem_Write' into Low Layer call. How it is done?

[B_12159]

 I found examples in STM32CubeIDE but they don't concern the special topic 'Mem', meaning writing device address and internal register address together within one data packet.

[Amira]

Hello B_12159,

The HAL and LL are complementary and cover a wide range of application requirements:

• The HAL offers high-level and feature-oriented APIs with a high-portability level. These hide the MCU and peripheral complexity from the end-user.
• The LL offers low-level APIs at register level, with better optimization but less portability. These require deep knowledge of the MCU and peripheral specifications.

But mixed use of low-layer APIs and HAL drivers is possible, several examples showing how to use HAL and LL in the same application are provided within stm32f4 firmware package (refer to Examples_MIX projects).

You can refer to the following user manual for more details (5.2 section) : https://www.st.com/resource/en/user_manual/dm00189702-description-of-stm32f7-hal-and-lowlayer-drivers-stmicroelectronics.pdf

PS: Once your question is answered, please click on "Select as Best" for the comment containing the answer to your initial question.

I would this help you !

Thanks & Regards,

Amira

[B_12159]

Hello Amira, thanks for your answer. Mixing is big problem. I have to choose HAL or LL in CubeIDE. LL is mandatory in my application. Have to fit in motor control application. I already used HAL in this case but it was too slow. Working with MC Workbench stopped.

[Amira]

If I'm not wrong, you're using CubeMX to generate your code that's why you cannot MIX HAL & LL drivers ?