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CCS/TMS320F28377D: the effect of TMU with sci txinterrupt

shook xu
Intellectual 745 points

Part Number: TMS320F28377D

Tool/software: Code Composer Studio

hi！

In my program i set the fp_mode to strict,shown as the follow picture

when i compile this program the ccs will give some advices 

then i download the program to 28377d, but after i run the program the sci tx ISR will not work correctly, i set the sci TX interrupt per 100us, but the tx ISR was not work in per 100us. 

after i set th fp_mode to relaxed, the sci TX ISR will work a little better, but is not work as per 100us. 

why!

thank you!

  • 0
    TI__Mastermind 43730 points

    if you select fp mode to be strict, there are some strict restrictions on how floating point computations are computed (think space crafts).

    hence operation take a lot longer and your CPU might be overloaded so much that it cannot get to the ISR

    For many control applications for motors and digital power it is not required to compute that ways and a fp_relaxed mode is ok