topic Re: S32K344 LPSPI DUAL CLOCK MODE in S32K

S32K344 LPSPI DUAL CLOCK MODE

MyLV — Mon, 04 Sep 2023 04:26:35 GMT

Hi NXP team,

I want to reduce Spi_AsyncTransmit() consumption on S32K344.

when I changed Core_LCK down to 80Mhz and the Spi_AsyncTransmit() executed time is 104 μs in result. if Core_LCK is 160Mhz then executed time is 52 μs.

According to RM, S32K344 support to 160Mhz in maximum.

MyLV_0-1693801157662.png

any suggestion to have done thru SPI configuration please?

When I check on Lpspi_Ip_Cfg.h file there is LPSPI_IP_DUAL_CLOCK_MODE ( Dual clock configuration). I confused about it.

Could you explain?

@cuongnguyenphu

Re: S32K344 LPSPI DUAL CLOCK MODE

cuongnguyenphu — Wed, 13 Sep 2023 08:51:15 GMT

Can you explan your question in more detail please? I cannot understand your question

Re: S32K344 LPSPI DUAL CLOCK MODE

MyLV — Thu, 14 Sep 2023 00:23:54 GMT

Hi @cuongnguyenphu

Thank you for replying.

I want to reduce Spi_AsyncTransmit() executing time. It seem only Core_LCK (MCU configuration) impact on the processing time.

Is there any solution to reduce the Spi_AsyncTransmit() executing time through SPI configuration?

Related to Clock, LPSPI_IP_DUAL_CLOCK_MODE is available inside SPI configuration.

From my understanding, the LPSPI_IP_DUAL_CLOCK_MODE allows user to change the clock mode at runtime, but it only effects the SPI data exchange rate, NOT the execution time of Spi_AsyncTransmit() right?

Best Regards,

MyLV

Re: S32K344 LPSPI DUAL CLOCK MODE

cuongnguyenphu — Tue, 19 Sep 2023 10:32:15 GMT

Hi @MyLV ,
Yes you're right, the setting LPSPI DUAL CLOCK MODE only effects to SPI data exchange rate.
To change Core_clk in runtime you should do as following:
1. Config 2 Mcu Clock setting mode, let's say: Clock Setting 0 for Core_Clk 80Mhz, and Clock Setting 1 for Core_Clk 160Mhz.
In S32CT, you can do this by below steps:
- In Clock tool, create 2 functional groups:

cuongnguyenphu_0-1695119255444.png

- Config Core_Clk for each Functional group

2. In Peripheral Tool, in MCU module, create 2 MCU Clock setting config coresponds to 2 Functional group of Clock tool in step1:

cuongnguyenphu_1-1695119433734.png

- Generate code.

3. In run-time, whenever you want to change the clock setting, just call Mcu_InitClock(<param>) with <Param> is the ID of MCU clock setting, which is generated in Mcu_Cfg.h file