S32KのトピックRe: How to realize SPI continuous transfer ?

How to realize SPI continuous transfer ?

vienpeng — Wed, 09 Dec 2020 01:38:22 GMT

Hi, everyone ！

I am writting a spi driver for chip S32K146, and I want to realize spi continuous transfer.

my code is shown follow, it doesn't work.

what should I do to realize this function.

my code

The wave of spi lines are shonw as fllow. The CS pin is pulled high after each byte. But I want the CS pin keep low until the last byte transfer is completed.

Can you give me some siggestions or some demo code ? Thank you !

Re: How to realize SPI continuous transfer ?

Alexis_A — Fri, 11 Dec 2020 03:19:51 GMT

Hello @vienpeng,

Have you tried looking at the SDK example lpspi_transfer_s32k146? If you use the config tool you only need to enable this in the option the PCS continuous checkbox:

Best Regards,

Alexis Andalon

Re: How to realize SPI continuous transfer ?

vienpeng — Thu, 17 Dec 2020 07:13:20 GMT

Hi, @Alexis_A

Thank you for your reply !

Where can I find the tool mentioned in your reply ? I just know "Processor Expert" integrated in S32DS. Your tool looks like containing more detailed configurations.

Re: How to realize SPI continuous transfer ?

Alexis_A — Thu, 17 Dec 2020 17:31:57 GMT

Hello @vienpeng.,

The new config tool is included in the latest release for the S32 Design Studio 3.3 (link)

Best Regards,

Alexis Andalon

Re: How to realize SPI continuous transfer ?

vienpeng — Thu, 17 Dec 2020 17:46:21 GMT

@Alexis_A ,thank you, it's helpful for me, I'll study it !

Re: How to realize SPI continuous transfer ?

vienpeng — Wed, 10 Mar 2021 20:24:37 GMT

Hi, @Alexis_A ,

My problem (how to realize SPI continuous transfer) has not been solved. It has taken me a lot of time.

I have checked some demos, but they are all based on interrupt or DMA.

I want to realize this function without interrupt and DMA.

Could you please provide me with a simple demo or a description of registers operation sequence?

Thank you !