PROCESSOR-SDK-J722S: how to get timerp inputClkHz

?? ?

Intellectual 280 points

Part Number: PROCESSOR-SDK-J722S

Tool/software:

Hi TI expert,
1. i am using J722s evm and sdk v11 example code as environment. sdcard, spl boot mode.

2. i want to use timer in visionapp, mcu20. and i got init code as below

TimerP_Params_init(&timerParams);

timerParams.inputPreScaler = 1u;

timerParams.inputClkHz = 250u * 1000u * 1000u;

timerParams.periodInUsec = durationUs; // eg 100us

timerParams.oneshotMode = 0;

timerParams.enableOverflowInt = 1;

TimerP_setup(timerBase, &timerParams);

my question is:
1. if i want get a 100us interrupt inverval, and i set periodInUsec =100, the interrupt trigger is not correct. i want to know how to set value inputPreScaler/ inputClkHz to make it correct. where can i get them.

thanks

1 month ago

0 Karthikeyan S 1 month ago

TI__Genius 13230 points

Hi,

I'm looking into this, I'll get back to you.

Regards,

Karthik

+1 Doredla Sudheer Kumar 1 month ago in reply to Karthikeyan S

TI__Guru 64520 points

Hi,

?? ? said:
my question is:
1. if i want get a 100us interrupt inverval, and i set periodInUsec =100, the interrupt trigger is not correct. i want to know how to set value inputPreScaler/ inputClkHz to make it correct. where can i get them.

Please check the CTRL MMR register of TIMERx CLK SEL to know what input clock is selected for this.

Also, refer to the default values of PLLs/
https://software-dl.ti.com/tisci/esd/09_02_07/5_soc_doc/j722s/pll_data.html

The Default Timer functional clock input is a 25MHz crystal clock, as per the TI EVM.
You need to pass 25MHz below if the Timer functional clock is an input crystal.
" timerParams.inputClkHz = 250u * 1000u * 1000u;"

Best Regards,
Sudheer

Processors

Processors forum

PROCESSOR-SDK-J722S: how to get timerp inputClkHz