S32K中的主题 SPI not working with 2mbps baudrate on example code

SPI not working with 2mbps baudrate on example code

Sukumar21 — Fri, 06 Oct 2023 11:06:49 GMT

Dear Nxp team,

I have an s32k144 EVM board. In this i am trying to establish SPI communication. I have used the Design studio 3.4. and I am using example lpspi_transfer_s32k146 sample project. I tried testing it with default setting (1mbps baud rate on spi). This works OK. but when i change the baud rate to 2mbps, the clock is distorted the spi fails.

I have attached the Config tool file for 1mbps and 2mbps setting

Clock with 2mbps setting:

clock with 1 mbps:

I have also attached the project zip.

Re: SPI not working with 2mbps baudrate on example code

PetrS — Fri, 06 Oct 2023 13:05:59 GMT

Hi,

maybe this is just sample issue on analyzer itself. Do you have selected sample rate high enough?
A 2MHz is not so high freq for an output pin, and data is clocked out at higher rate.

BR, Petr

Re: SPI not working with 2mbps baudrate on example code

Sukumar21 — Fri, 06 Oct 2023 13:25:41 GMT

Hey Petr, Thanks for reply, SO i have slave IC that works on SPI at 2M-6M clock data rate. and i have to interface it with s32k146.
The problem was communication never got through hence i have to shift to logic analyzer.

The same is seen on DSO also.

Re: SPI not working with 2mbps baudrate on example code

PetrS — Tue, 10 Oct 2023 10:33:10 GMT

Hi,

I tried your code on S32K146EVB and below is signal measured

I see no issue here.

BR, Petr