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STM32F413 DMA1 peripheral restrictions?

Forum|Forum|7 years ago
January 18, 2019
8 replies
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I'm having trouble understanding this from the datasheet and reference.

What peripherals are allowable targets for DMA1 memory-to-peripheral transfers?

Thanks, Best Regards, Dave

PS: I tried to use a stream in DMA1 to write to a DMA control register, and it fails...

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Best answer by waclawek.jan

Oh, of course not. This is the picture you are looking for:

and this one:

(There's also Tab.1 in RM, but that's way less sexy).

However, except for timer, I don't recommend you to use any other peripheral-port target than the data register of the peripheral which triggers that stream. And note, that on the memory port you can't access peripherals (not even APB1 peripherals), only memories. So, for most practical purposes, the table given by md.suhel is adequate.

JW

MSuhe

Associate III

Below table from the reference manual should provide you the information you are looking for.

Dave NadlerAuthor

Senior III

The question posed is: What are the restrictions on peripheral targets (ie, peripherals that can be written to) for DMA1?

The posted table shows DMA request channels; not what I asking about...

Thanks!

waclawek.janBest answer

Super User

Oh, of course not. This is the picture you are looking for:

and this one:

(There's also Tab.1 in RM, but that's way less sexy).

However, except for timer, I don't recommend you to use any other peripheral-port target than the data register of the peripheral which triggers that stream. And note, that on the memory port you can't access peripherals (not even APB1 peripherals), only memories. So, for most practical purposes, the table given by md.suhel is adequate.

JW

Tesla DeLorean

Guru

>>What peripherals are allowable targets for DMA1...

APB1 targets

DMA2 can do memory-to-memory, so APB2 targets, plus anything else, ie GPIOB->ODR

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Dave NadlerAuthor

Senior III

Thanks @Community member - I saw that but I've confused about the nomenclature. In the datasheet there's a memory table that shows the following. AHB1 vs. APB1? What I'm missing is which peripherals are associated with APB1? Aha! Thanks @Community member for pointing me to the diagram and table.

Appreciate the help!

Dave NadlerAuthor

Senior III

And I now see why my DMA failed. I'll need to rework the puzzle to get a trigger into some DMA2 stream (perhaps by chaining timers)... Thanks Guys!

waclawek.jan

Super User

> What I'm missing is which peripherals are associated with APB1?

Those in the red circle in that second picture I posted above.

And, as I've said there, in Tab1 in RM they are listed, with APB1 in the column next to them. (those which have AHB1 in that column, belong to... ehm... AHB1; similar with other buses).

JW

S.Ma

Principal

There are 2 DMA stream/channel tables. You can choose one element per column.

What is in the box is the DMA incoming memory request trigger signal source.

If it is SPI_TX, means it's for the memory to peripheral transfer.

Find in which table the peripheral you'd like to use is located.

One DMA per clock domain...

SThom.7

Associate III

On this note there is an error in Table 30. DMA1 Request Mapping:

Channel 5 Stream 0, should be UART8_TX (Not Rx)

I

Imen.D

ST Technical Moderator

Hello @SThom.7 ,

Thanks for reporting this typo.

We will take care to fix this typo for coming release of RM0430.

Regards,

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks

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