S32KのトピックUsing 2 SPI modules with a MUX for TPL loopback

Using 2 SPI modules with a MUX for TPL loopback

Vishal_Pandey — Mon, 06 Dec 2021 10:32:23 GMT

Hi !

At any point of time only one TPL Transceiver is active on the bus i.e., Half duplex. So can we use 2 SPI's instead of 3 as we have Enable options for 2 transceivers as shown in the figure below ?

SPI1 used as Master and SPI2 is used as Slave

Vishal

Re: Using 2 SPI modules with a MUX for TPL loopback

danielmartynek — Tue, 07 Dec 2021 10:31:25 GMT

Hello Vishal,

The MCU has 3 LPSPI instances + FlexIO that can emulate SPI.

So why you don't use it?

Anyway, we can't confirm that your proposed solution will work.

This is really an application issue.

If you have any specific questions on the LPSPI / FlexIO WH, please let me know,

Regards,

Daniel

Re: Using 2 SPI modules with a MUX for TPL loopback

Vishal_Pandey — Tue, 07 Dec 2021 17:43:04 GMT

Hi Daniel,

Thanks for responding ! Flex IO is being used for an other application peripheral(memory). It will be helpful if you can point out the drawbacks of using 2 SPI modules then I can think of emulating SPI through External IC or USART.

R ,

Vishal

Re: Using 2 SPI modules with a MUX for TPL loopback

danielmartynek — Thu, 09 Dec 2021 11:13:59 GMT

Hello @Vishal_Pandey,

It is difficult for me to review the design because I don't know the use case.

If the two transceivers don't start transfers at the same it, it should be feasible.

As I said, it is an application issue.

If you have any questions on the LPSPI, FlexIO modules or the MCU overall, please let me know,

Regards,

Daniel