topic Re: Kenitis KL05 DMA channel source in Kinetis Microcontrollers

Kenitis KL05 DMA channel source

cfk — Thu, 28 Dec 2023 02:03:25 GMT

Hi,i am recently use Kenitis family MCU KL05Z32 , but i conldn't find the dma channel source's details ,neither datasheet nor RM document,where could i find the dma request source of KL05? Could somebody help me?

Re: Kenitis KL05 DMA channel source

xiangjun_rong — Wed, 03 Jan 2024 03:37:54 GMT

Hi,

Pls refer to section 3.4.8.1 DMA MUX Request Sources in reference manual of KL05.

Hope it can help you

XiangJun Rong

Re: Kenitis KL05 DMA channel source

migry — Sat, 06 Jan 2024 16:52:38 GMT

Having used DMA in a small number of experimental configurations, and found the documentation "lacking".

I think naming this field as "SOURCE" is confusing.

DMA transfers are triggered by some event, which can include a ALWAYS trigger.

The SOURCE is the source of the TRIGGER.

For some reason the PIT timer gets a special feature in that the TRIG selects the PIT timer overflow as the trigger, but with limitations that you can only use DMA0 with PIT0, DMA1 with PIT1, etc.

While some of the trigger "sources" are obvious, there are a few which I couldn't figure out from the reference manual.

Re: Kenitis KL05 DMA channel source

xiangjun_rong — Mon, 08 Jan 2024 09:20:02 GMT

Hi,

As the section 3.4.8.1 DMA MUX request sources, the source number in Table 20 define the DMA request source.

The DMA triggering source can only be PITx channel, this is a special case, it can manipulate GPIO with PIT cycle.

Hope it can help you

XiangJun Rong