S32K144 LPIT timer is inaccurate

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S32K144 LPIT timer is inaccurate

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547416104
Contributor III

Hello EveryOne,

I usd SDK to config the LPIT, and delay 100ms to send command to slave IC,but I find the time interval is inaccurate, it is more than 100ms. I check the timer task, no redundant code is running, whether need to do other configure for the lpit module?

thanks!

547416104_0-1674028242481.png

547416104_1-1674028275760.png

 

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi 

Please toggle a GPIO in LPIT interrupt and measure the period by using oscilloscope. I try to modify the lpit_periodic_interrupt_s32k144 SDK example and able to get 1ms when input Timer period 1000.


Best Regards,
Robin
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547416104
Contributor III

The issue is fixed, timer is holded by ADC autocalibration active.

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi 

Please toggle a GPIO in LPIT interrupt and measure the period by using oscilloscope. I try to modify the lpit_periodic_interrupt_s32k144 SDK example and able to get 1ms when input Timer period 1000.


Best Regards,
Robin
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- We are following threads for 7 weeks after the last post, later replies are ignored
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