S32KのトピックSPI Master Slave communication with two EVB

SPI Master Slave communication with two EVB

P007 — Wed, 27 Sep 2023 08:43:45 GMT

Hi ,

I am using the S32K146EVB for LPSPI communication, In that I'm using the one EVB as a master and another EVB as a slave.

only half duplex is working.

Not getting the data from slave.

I also used the example code for master attached below.

Re: SPI Master Slave communication with two EVB

danielmartynek — Wed, 27 Sep 2023 09:27:36 GMT

Hi Pankaj Unde,

In that case, there is something wrong with the Slave device.

Have you tried the SDK example instead?

It utilizes both Master and Slave in the one project.

Regards,

Daniel

Re: SPI Master Slave communication with two EVB

P007 — Wed, 27 Sep 2023 15:05:06 GMT

Thanks @danielmartynek

I am using the DS32 ARM for this.
I have tried that example code .
Used that code in both slave and master EVB,
but only it is giving the data on MOSI.

Re: SPI Master Slave communication with two EVB

danielmartynek — Wed, 27 Sep 2023 15:37:47 GMT

Did you connect the right pins?

If you modified the example projects, please attached both projects here.

Or create a ticket if you don't want to share it publicly.

Make sure the lpspi transfer API on the Slave device is called before the Master starts the transfer.

The Slave must have data in the TX FIFO when the transfer starts.

Regards,

Daniel

Re: SPI Master Slave communication with two EVB

P007 — Tue, 03 Oct 2023 08:55:21 GMT

Hi @danielmartynek

Please find the attached example codes, which I am using for communicating EVB.

Re: SPI Master Slave communication with two EVB

danielmartynek — Fri, 29 Sep 2023 07:07:31 GMT

Hi @P007,

You configured both MCUs as SPI Masters.

And this is what you call in the Slave project you attached:

for(;;)
{
LPSPI1_16bits_read = LPSPI1_receive_16bits(); /* Receive half word on LSPI1 */
LPSPI1_transmit_16bits(tx_16bits); /* Transmit half word (16 bits) on LPSPI1 */
counter++;
}

As I have already mentioned, when the Master starts the transfer, the LPSPI TX FIFO on the Slave's side must be filled with data provided it is a full-duplex format. But your code is waiting for RX data instead.

Please use the SDK or RTD drivers at least for the Slave device.

Regards,

Daniel