Getting huge different Delay time in measuring a blocking delay timer which run in different memory address of STM32H7a3ii. Was this behavior of the MCU?

[WChan.5]

I create a simple blocking delay timer using simple looping and run in STM32H7a3ii. The program was linear, no code optimization, no interrupt. Without any changes of the blocking delay timer function, i found that when the blocking delay timer placed in certain address, it gave me a huge different delay time. the varies was about 6 times different. Please assist me for this behavior.

[FBL]

Hello @JScot.6​ 

Here is the AN4839 listing different solutions for cache maintenance and data coherency Level 1 cache on STM32F7 Series and STM32H7 Series

@Piranha​ if there are such, I guess you can try different solution, it depends on the application.

[WChan.5]

@F.Belaid​ , thanks for the information. i tried to clean the caches before call the blocking delay function, yet i still can reproduce the problem by using the method mentioned.