RTOS/TM4C1292NCPDT: How TI RTOS Clock tick time is derived from system clock

The RTOS Tick comes from the NVIC Systick, and is typically set at 1ms.
Such "internal tick" does not affect the CPU system clock.
I don't use RTOS, but I believe that the system clock is configured just like any board without RTOS, with SysCtlClockFreqSet().
The RTOS User Guide .pdf inside the RTOS /docs folder should be able to teach you more on this kind of things.
Bruno

Hi Bala,

SYS/BIOS (the kernel for TI-RTOS) has a Boot module for TivaC.  The boot code runs early on (before main()) and sets up the system clock frequency.  The default frequency is 120MHz for this device, so you shouldn't need to change any of the Boot configuration.  (You can check the SYS/BIOS cdoc under ti.catalog.arm.cortexm4.tiva.ce.Boot for configuration, if you're intersted.)  The Boot code for setting the system clock frequency is pretty much identical to the TivaWare SysCtlClockFreqSet() function.

Best regards,

Janet

Hi Janet,

Thanks for your reply. 

i have attached the snippet below. i want to measure clock cycle required for piece of code. for that i am using Event count in CCS debugging tool.

if i understand correctly, below statement is true.

Event count * 8.33ns (processor operating frequency 120MHz) =Total time required for piece of code.

Please clarify.

Regards

Bala