topic Re: Problem in LPIT configure in S32K

Problem in LPIT configure

subham_dey — Wed, 29 Jan 2020 10:31:27 GMT

I am trying to configure LPIT timer for 1ms in s32k146 board. I am not getting the accuarte output. please help me to do this. Is it possible to configure LPIT for 10 ms or whatever time i want .I am attaching the code. Please tell me what should i do and how i can change the timer interrupt time. kindly help me asap.

Re: Problem in LPIT configure

subham_dey — Thu, 30 Jan 2020 14:15:42 GMT

Thanks Danial for replying. can u kindly tell me how do u calculate??

and if i want to configure 3 timer in different interrupt at together value then how to do it??

Re: Problem in LPIT configure

danielmartynek — Thu, 30 Jan 2020 14:48:22 GMT

Hi subham.dey@embitel.com,

I think it is quite straight-forward, it depends on the LPIT function clock, which is common for all 4 LPIT channels, and the values in TVALn registers which selects a timeout period for each LPIT channel. So, although all the four channels runs at the same clock, each channels can generate an interrupt at a different timeout period.

Please refer to the S32K1xx reference manual for more information.

Thank you,

Regards,

Daniel

Re: Problem in LPIT configure

subham_dey — Fri, 31 Jan 2020 09:40:43 GMT

Thanks Daniel. I understood the concept..Now it works fine.

Re: Problem in LPIT configure

gowthaman_krish — Fri, 28 Feb 2020 06:17:44 GMT

Hi Shubam / Daniel

Hope you Guys doing good .

Recently i am also plan to configure some Timer interrupt , then i got some doubts and referred your inputs .

Now According to my understanding above the issue :

freq is = 40MHZ

can you let me know how LPIT timeout period (TMR_TVAL) value put 400000 for 10MS ?

 LPIT0->TMR[0].TVAL = 400000;

for 10 MS ???

please provide steps how you calculated

Thanks in advance.

Re: Problem in LPIT configure

subham_dey — Fri, 28 Feb 2020 10:01:39 GMT

Hi Gowthaman,

According to the understanding, your system clock frequency is 40 MHz.

LPIT0->TMR[0].TVAL = TIMER0_LOAD_VALUE;

If u want to configure the timer for 10ms then TIMER0_LOAD_VALUE will be

(SPLLDIV2_CLK_FREQ /TIMER0_PERIOD_HZ)

if timer period is 10ms then in Hz it will be 100Hz

hence 40MHz/100=40000000/100=400000

if any query u have u can let me know.

Re: Problem in LPIT configure

gowthaman_krish — Wed, 15 Apr 2020 11:59:29 GMT

sorry for late reply

thanks subham dey..