HAL I2C Slave using DMA and interrupts. Has anyone found a good description of how to use the HAL DMA functions?

[JTayl.4]

I see there are sequencing functions, but have found no examples or documentation on how to use them. I need to be able to RX an address, then a pointer, and then either read or write data on a restart, multiple bytes, then a stop.

By sequencing functions, I am referring to: HAL_I2C_Slave_Seq_Receive_DMA() and HAL_I2C_Slave_Seq_Transmit_DMA().

Does anyone have any examples or flowchart for how to use the DMA functions to receive and transmit from a slave's perspective?

Thank you!

Jeff

[Amira · Accepted solution]

Hello @JTayl.4​ 

You can find the description of these HAL APIs in the user manual. eg: https://www.st.com/resource/en/user_manual/dm00122016-description-of-stm32f3-hal-and-lowlayer-drivers-stmicroelectronics.pdf

You can also refer to the firmware example "I2C_TwoBoards_RestartComIT" under this path :

\STM32Cube\Repository\STM32Cube_FW_F3_V1.11.0\Projects\STM32F303K8-Nucleo\Examples\I2C\I2C_TwoBoards_RestartComIT. This example is using IT mode, but you can make some changes to use it with DMA mode (configuration of DMA)

Hope this would help you!

Regards,

Amira

[JTayl.4]

Hi Amira. Thank you. Somehow I missed that example when looking for examples in the STM32CubeIDE. I have my code up and running now. Should have asked sooner. %)