PIT Timer clock source

Reyna_pan45 — Tue, 05 Dec 2023 09:14:36 GMT

hi ALL

I created a project about pit timer about 1 ms timer interrupt with RTD 3.0.0 ,S32DS 3.5, s32K312

PIT clock frequency is 30 MHz ,so 1 ms =1/( 30 MHz/30000)

so PIT_PERIOD = 30000，but the timer is incorrect ,

and i debug the project find the PIT clock frequency ≈ 121 MHz

could you tell me was wrong with my project ?thanks

see attached file "pit_test.zip"

Re: PIT Timer clock source

PetrS — Tue, 05 Dec 2023 12:36:42 GMT

Hi,

your system is running out of FIRC not SPLL due to wrong clock init API used.
So instead of Clock_Ip_InitClock(&Clock_Ip_aClockConfig[0]); use rather

Clock_Ip_Init(&Clock_Ip_aClockConfig[0]);

then have #define PIT_PERIOD 30000U /* 1ms */ as you calculated

BR, Petr