I2C DMA fails when moving buffer from AXI RAM to SRAM. Working with STM32H753. DMAing I2m works from AXI SRAM but not SRAM1/2/3. only change is to move the buffer location. Device is a gt911 touch screen. Any suggestions?

[waclawek.jan · Accepted solution]

DMA+Caching issues?

https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devices

JW

[PCevo.1]

Basically yes, this article straightened things out, thank you.

[PCevo.1]

Good morning,

The issue appears to have been trying to DMA to DTCM RAM. Once the buffer was moved out of DTCM RAM everything worked as expected. The article linked in the response above provide the required information.