S32K148 LPSPI AUTOPCS

[SONGTAOSI]

Hi,

I counfig LPSPI1 as slave, LPSPI0 as master ,and LPSPI0 transfer data to LPSPI1,and LPSPI1_AUTOPCS bit is set,   TCR[CPHA]=1.The SCK(LPAPI0 produce )remain more than 4 LPSPI clock cycle between word. But when i do not connect LPSPI0_PCS0 to LPSPI1_PCS0, the transfer between LPSPI0 and LPSPI1 is failure，LPSPI1 can't receve data which from LPSPI0. 

Whether my understand correctly about ?  :  LPSPI1_AUTOPCS = 1,and TCR[CPHA]=1,andThe SCK(LPAPI0 produce )remain more than 4 LPSPI clock cycle between word. If the above conditions are met，Even if the LPSPI1_PCS0 not connect to LPSPI0_PCS0,LPSPI can receve data from LPSPI0.

ooking forward to your reply！

[danielmartynek]

Hi @SONGTAOSI,

Have you scoped the bus? Can you show the oscillograms?

What is the LPSPI functional clock and CCR, TCR configuration?

Have you tried increasing the SCKPCS, PCSSCK or DBT parameters?

Regadrs,

Daniel

[SONGTAOSI]

Hi,

Thank fou your reply.

my bus clock is 48MHz, and Function clock is 8M.

LPSPI0_CCR 

LPSPI1_TCR

Are there any other conditions required to configure AUTOPCS？

Thanks!

[danielmartynek]

Thanks @SONGTAOSI, this seems to be correct.

Did you configure the polarity of the selected PCS as described here:

Regards,

Daniel

[SONGTAOSI]

Hi,

I  configure the polarity of  PCS0 = 1,selected PTD3 as PCS0,but i configure  PTD3  as GPIO .

[danielmartynek]

Hi @SONGTAOSI,

Does it mean it works now?

[SONGTAOSI]

Hi,

Sorry,It still can't work now. Could you please provide a Demo about LPSPI AUTOPCS?Thank you very much！

[danielmartynek]

Hello @SONGTAOSI,

I'm sorry for the delay.

Please find the test project attached (S32DS 3.4, SDK RTM 4.0.3)

The slave receives 4 8bit frames in the AUTOPCS mode (1MHz).

Regards,

Daniel