SPI1 dma source - FRDM-K22F

[errorek123]

Hello,

I'm writing some code to handle SPI dma transfer but it seems like K22 chip got common source for TX and RX for SPI1. Does it mean it can be either be used for receive data or transmit data and it can't be used for both? Is there any workaround or i have to live with that or switch SPI0 if both rx and tx dma is needed?

[kerryzhou · Accepted solution]

Hi Brian Smith ,

  Your are right, in the FRDM-K22 on board K22 chip, the SPI1 share the transmit and receive request.

  So, in my opinion, if you want to use both the Transmit and receive DMA function, it's better to use SPI0 interface, it has the separated request source:

Wish it helps you!

If you still have question about it, please kindly let me know.

Have a great day,
Kerry

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