Use STM32 as I2C Slave with DMA

[jenspogo]

Hey guys

I had an working system with an raspberry pi Master and an STM32F103 slave which collects data from other slaves via another I2C bus. I have done over 6000k measurements. I just added a few temperature sensors and it kills a lot of timing. To overcome this problem, I would like to use DMA for the raspberry-STM connection. I have seen the SPI DMA example and it seems not to be that easy.

has anyone did that with I2C? And does it work with the STMf103?

Greets, Jens

[fpiSTM]

Which core you used ?

[jenspogo]

I'm still a little bit confused by the cores, but it should be the official ST Core from https://github.com/stm32duino/BoardMana ... index.json

[fpiSTM]

Currently DMA is not used for I2C.
If you want use it you will have to implement it yourself using the HAL/LL directly.

[jenspogo]

Hey thank you for your reply!
I think, that goes beyond my programming skills...
Is there a plan to implement this feature?

Greets

[ag123]

normally i2c is well below 1Mbps. Hence, dma is hardly used, i'd guess.
i'd think spi may be more appropriate if you'd like to try using dma.
but i've not tried playing with slave modes.
i think for slave mode, it may require falling back to HAL rather than arduino api as well.