S32KのトピックRe: Possibility to use SPI manual software chip select

Possibility to use SPI manual software chip select

Othmane1 — Tue, 18 Apr 2023 09:19:15 GMT

I am trying to communicate with the TLE94103 component using SPI (LPSPI0), is it possible to use some pin that has the GPIO function to operate as a chip-select pin and use the other SPI pins (CLK, MOSI, and MISO) in their usual pins that have the functionalities for SPI?

and if I want to send and receive I am gonna first set the chip select GPIO to low and then set it to high after sending/receiving

is this possible?

Re: Possibility to use SPI manual software chip select

danielmartynek — Tue, 18 Apr 2023 11:50:48 GMT

Hello @Othmane1,

You did not specify the part number.

But yes, this is possible.

The CS selected in the LPSPI module does not have to be routed to a pin.

A GPIO can be used instead, but it would be your responsibility to assert and deassert the GPIO.

Why do you need that?

The LPSPI module allows configuring the PCS delays, frame size etc, it also allows continuous transfers with the CS asserted over multiple frames.

Regards,

Daniel

Re: Possibility to use SPI manual software chip select

elb1 — Wed, 30 Aug 2023 08:33:59 GMT

Hello, I have the same question but for different microcontrolller, is this (use chip select as gpio) also possible for mpc5748g ?
thank you

Re: Possibility to use SPI manual software chip select

danielmartynek — Wed, 30 Aug 2023 08:48:08 GMT

Hi @elb1,

Yes, this is the same, the CS of the SPI module does not have to be used, it can be controlled by a GPIO.

If you have any questions on mpc5748g, please create a new thread in the MPC5xxx community:

https://community.nxp.com/t5/MPC5xxx/bd-p/mpc5xxx

Regards,

Daniel

Re: Possibility to use SPI manual software chip select

elb1 — Wed, 30 Aug 2023 11:38:33 GMT

Okey thank you for your response