How to make the FDCAN with DMA.

Karthick008 · ‎2025-07-01

Hi, I'm not able to find any DMA available with CAN peripheral in STM32G4. After going deep search I found there's no such native DMA request available for CAN peripherals. So, I want to know is it true that STM32 controllers don't come with DMA with FDCAN/CAN. If available, then kindly share me the reference for making it work. Since, I want to have fast data transfer, and if I use the FDCAN with interrupt based, it will overload my CPU cycles. Thanks in advance.

Saket_Om · ‎2025-07-02

Hello @Karthick008

DMA cannot be used with FDCAN on STM32G4 because the peripheral does not provide DMA request lines.

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Saket_Om

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Saket_Om · ‎2025-07-02

Hello @Karthick008

DMA cannot be used with FDCAN on STM32G4 because the peripheral does not provide DMA request lines.

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Saket_Om

mƎALLEm · ‎2025-07-02

FDCAN and CAN cannot be used with DMA on all STM32 not specific to STM32G4 family.

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Andrew Neil · ‎2025-07-03

Follow-up question: How to handle high-volume FDCAN data without DMA?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.