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M
morthy
Associate II
June 26, 2025
Solved

Why is my MP135 program running so slowly?

  • June 26, 2025
  • 1 reply
  • 503 views

my code only made changes the io, no rtos, no interrupt, but it cost over 1 us.  the picture is that io sta. and clockp1.jpgp2.jpg

Best answer by PatrickF

Hi @morthy 

maybe you missed to enable the I & D caches ?

Regards.

1 reply

PatrickF
PatrickFBest answer
Technical Moderator
July 3, 2025

Hi @morthy 

maybe you missed to enable the I & D caches ?

Regards.

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M
morthyAuthor
Associate II
July 9, 2025

oh,you are right, after i enable the cache,the runtime speed doubled.

PatrickF
PatrickF
Technical Moderator
July 9, 2025

Hi,

only doubled ?

I guess only Instruction cache were enabled (as it is simple as set a bit).

Data cache might bring more perf (e.g. write to GPIO section will be posted, so 0 waits), but this need to setup MMU with correct regions (usually sections attributes are : memories as "NORMAL", peripherals as "DEVICE" ).
I'm not fully knowledgeable on how to do it with HAL, but I assume functions to do such exists (maybe examples).

Regards.

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