How to use DMA on STM32L0 with FIFO threshold ?

[Alexandre T]

Posted on October 10, 2017 at 11:31

Hello,

I saw on the STM32L0 User Manual that FIFO mode and its threshold can be configured thanks to HAL_DMA_Init().

For a given stream, HAL_DMA_Init() API allows programming the required configuration

through the following parameters:

- Transfer Direction

- Source and Destination data formats

- Circular, Normal or peripheral flow control mode

- Channels Priority level

- Source and Destination Increment mode

- FIFO mode and its Threshold (if needed)

- Burst mode for Source and/or Destination (if needed).

But I don't find where I can enable it and choose my threshold as I never used DMA before ?

[waclawek.jan]

Posted on October 10, 2017 at 11:46

AFAIK the DMA in 'L0 (and 'F0/'L1/'L4) has no FIFO.

I guess this is some copy/paste artefact.

JW

[Alexandre T]

Posted on October 10, 2017 at 11:51

I found this

http://www.st.com/content/ccc/resource/technical/document/user_manual/41/78/8e/63/f9/32/44/12/DM00113898.pdf/files/DM00113898.pdf/jcr:content/translations/en.DM00113898.pdf

 page 50

[waclawek.jan]

Posted on October 10, 2017 at 12:11

That does not make it more real. Search for FIFO in the DMA chapter of the respective RM.

JW