what happen "if uwTick reach to max limit HAL_MAX_DELAY"

[vchau.2]

Hi all,

How loop back handled in hal layer if uwTick reach to the max limit HAL_MAX_DELAY=0xffffffff

[Tesla DeLorean]

​

Don't​ delay for 50 day intervals.

​

If you need to do that, perhaps consider a different approach?​

​

F​or shorter delays it should handle correctly unless they break the code again..

[vchau.2]

I'm taking about short delay,

Let uwTick current value is 0xFFFFFFF0 and then use HAL_Delay(1000)

As per HAL_Delay function

 uint32_t tickstart = HAL_GetTick();

 uint32_t wait = Delay;

 /* Add a freq to guarantee minimum wait */

 if (wait < HAL_MAX_DELAY)

 {

  wait += (uint32_t)(uwTickFreq);

 }

 while((HAL_GetTick() - tickstart) < wait)

after 256 tick HAL_GetTick returns 0 because of integer value roll over and this while become false and never get 1000 ms delay and All HAL library will failed because HAL_GetTick() function used in complete HAL library.

[Pavel A.]

Why 256?

Just play with it, use a blinking led or smth. It works.

[Michal Dudka]

Nick Gammon demonstrate how to handle millis (aka GetTick) to avoid overflow problems:

https://www.gammon.com.au/millis