Kinetis MicrocontrollersのトピックKL26 as SPI Slave (DMA)

KL26 as SPI Slave (DMA)

abby — Thu, 09 Oct 2014 07:57:18 GMT

Hi All,

I use KL26 as a 16-bit SPI slave device and DMA to move receive data.

So I need to access both SPI_DH and SPI_DL in one receive event.

My question is how to assign DMA Data Source address?

Because SPI_DH and SPI_DL has different address.

Is there any KL26 16-bit SPI slave example with DMA for reference?

Thank you.

Abby

Re: KL26 as SPI Slave (DMA)

Alice_Yang — Fri, 10 Oct 2014 09:42:36 GMT

HI Abby,

You can config ssize 16-bit and select DMA data transfers in 16-bit blocks .

Hope it helps

Alice

Re: KL26 as SPI Slave (DMA)

kerryzhou — Fri, 10 Oct 2014 09:51:53 GMT

Hi Abby Chen,

From the reference manual of KL26, you can use the FIFO mode FIFOMODE=1, just like the following:

You can set the address of DL as the source of your DMA, the DMA will read the data from the DH:DL automatically.

Now, we don't have the sample code of KL SPI DMA, you should do it by yourself.

Wish it helps you!

Have a great day,
Jingjing

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