topic Re: When using FLEXIO_SPI, how to toggle CS in Muti byte unit. in S32K

When using FLEXIO_SPI, how to toggle CS in Muti byte unit.

HyungGyuKim76 — Fri, 28 Jan 2022 07:56:44 GMT

Hi,

I'm using S32K148U EVB kit.

Implemented FLEXIO_SPI using the provided RTM3.0 v3.0. However, the SPI waveform comes out as below.

When transferring from Master, 10 bytes(NUMBER_OF_FRAMES is 10) are transmitted as shown below. However, CS is toggled in units of 1 byte.

SPI_MasterTransferBlocking(&spi1Instance, master_send, master_receive, (uint8_t) NUMBER_OF_FRAMES, (uint8_t) TIMEOUT);

How can toggle CS each of transfer size?

If possible, please provide example code.

Re: When using FLEXIO_SPI, how to toggle CS in Muti byte unit.

danielmartynek — Fri, 28 Jan 2022 13:43:37 GMT

Hello @HyungGyuKim76,

Do you want to keep the CS asserted during the 10byte transfer or what is the frame size required here?

The driver supports 1byte, 2byte and 4byte frames.

If you want to send 10byte frames, you need to control the CS pin by the GPIO driver - toggle the pin before and after this SPI_MasterTransferBlocking() function is called.

BR, Daniel

Re: When using FLEXIO_SPI, how to toggle CS in Muti byte unit.

HyungGyuKim76 — Fri, 28 Jan 2022 16:29:45 GMT

It works normally by simply changing the CS pin to gpio. thank you.

Re: When using FLEXIO_SPI, how to toggle CS in Muti byte unit.

HyungGyuKim76 — Fri, 04 Feb 2022 09:01:15 GMT

Sloved it by using CS as GPIO.

Re: When using FLEXIO_SPI, how to toggle CS in Muti byte unit.

RishikeshB — Tue, 20 Sep 2022 04:17:34 GMT

at what pins you are checking the output