Maximum SPI buffer size

AnhNguyenDuc — Mon, 16 Oct 2023 11:12:02 GMT

Hi,

I have some definitions of the maximum size of the buffer data when communicating via SPI (256 bytes, 1024 bytes,...).

In SPI S32K drivers (on S32DS), Do we have a limitation for the SPI buffer size? Or Can we configure it?

I'm using S32K1xx, S32K312 with both autosar and non-autosar versions.

Thanks.

Re: Maximum SPI buffer size

cuongnguyenphu — Tue, 17 Oct 2023 03:35:41 GMT

Hi,
As far as I know, Autosar define 2 types of buffer: Internal and external buffer.
With Internal buffer, RTD limits Tx and Rx buffer to SpiIbNBuffer (max 65535) bytes. Please check define IB in file Spi_<>_PBcfg.c as below:

For external buffer, you can define your own Tx/Rx buffer and call Spi_SetupEB() to set buffer for your SPI channel. This function limits the size of your buffer as SpiEbMaxLength (max 65535 bytes)

topic Maximum SPI buffer size in S32K

Maximum SPI buffer size

Re: Maximum SPI buffer size