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how many clock cycles does TI-RTOS take for context switching

Arslan Ahmad Faisal
Prodigy 230 points

Other Parts Discussed in Thread: MSP430F5438A, SYSBIOS

Hello

I am using TI-RTOS on MSP430F5438A microcontroller.

My question is:

                How many clock cycles does TI-RTOS take for context switching.

Thanks!

Arslan

  • 0
    TI__Mastermind 21645 points

    Hi Arslan,

    What version of TI-RTOS are you using ? I have shared some numbers from TI-RTOS 2.00.02 below. This version of TI-RTOS includes SYS/BIOS 6.40.02 kernel. The cdoc for this kernel includes the MSP430 benchmarks: http://downloads.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/sysbios/6_40_02_27/exports/bios_6_40_02_27/docs/cdoc/ti/sysbios/benchmarks/doc-files/benchmarks.html

    I am using the MSP430 small model benchmarks as reference here. You can also obtain the large model numbers from the above link.

    On the small model, a semaphore post with no context switch takes 194 cpu cycles and a sempahore post with context switch takes 286 cycles. If you take the difference of these numbers, you get 92 cycles which should roughly be the number of cpu cycles it takes to do a task context switch.

    Best,

    Ashish