S32KのトピックRe: Delay of LPSPI between frames

Delay of LPSPI between frames

fumiaki — Fri, 28 May 2021 05:09:07 GMT

Regarding to the delay such PCSSCK, SCKPCS and DBT of S32K144 LPSPI CCR, SCKPCS in reference manual states "configures the delay from the last SCK edge to the PCS negation".

Even without PCS negation between frames, do the delays occur correctly?

When CS has been kept assertion between frames using GPIO, it seemed like the delays occurred.

Re: Delay of LPSPI between frames

danielmartynek — Fri, 28 May 2021 07:08:43 GMT

Hi @fumiaki,

The LPSPI module does not have an option to disable the PCS.

So even if you don't use the PCS output of the LPSPI module on a port but you use a GPIO instead, the module still keeps generating it with the configurable delay.

Regards,

Daniel