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sebxx4
Associate III
February 19, 2026
Solved

[STM32H730ZBT] I2S no data with DMA and D-Cache enabled

  • February 19, 2026
  • 1 reply
  • 98 views

Hello, 

I need to have D-Cache enabled to improve performance of FMC external SDRAM (it's >3x slower without D-Cache enabled). I also want to use I2S for audio. But with D-Cache enabled, I don't get any data from ADC. What can I do to use I2S with D-Cache enabled?

Best answer by mƎALLEm

Hello,

You need to ensure a data coherency when it turns to the DMA usage while D-cache is enabled.

Need to perform cache maintenance by software.

Refer to the AN4839 "Level 1 cache on STM32F7 Series and STM32H7 Series", especially the section: 3.2 Example for cache maintenance and data coherency and the scenario described in it:

mALLEm_0-1771514592953.png

 

1 reply

mƎALLEm
mƎALLEmBest answer
Technical Moderator
February 19, 2026

Hello,

You need to ensure a data coherency when it turns to the DMA usage while D-cache is enabled.

Need to perform cache maintenance by software.

Refer to the AN4839 "Level 1 cache on STM32F7 Series and STM32H7 Series", especially the section: 3.2 Example for cache maintenance and data coherency and the scenario described in it:

mALLEm_0-1771514592953.png

 

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