transform the function HAL_GetTick() in a 64bit

[JJoao.1]

Hello Everybody,

I would like transform the HAL_GetTick() function more than 49 days.

I don't find a NVIC overflow on this function to increment a second variable.

In my while I have do this with

uint32_t		Mem_GetTick;
uint64_t		Tick64;

while (1)
  {
       if (HAL_GetTick() != Mem_GetTick)
	{
		Mem_GetTick = HAL_GetTick();
		Tick64++;
	}
.
.
.
}

MAybe there is a more efficicent solution

Thank you to share your exeprience

[Tesla DeLorean]

>>Maybe there is a more efficient solution

In SysTick or via HAL_IncTick() ??

You really shouldn't have any timeouts / spin loops that wait for 49-50 days, perhaps address those parts of the code.

Try to use delta time measurements, and not wait of things like >= time-in-future or >= (start + delay-time)

Some STM32 have a 64-bit count in the ETH-PTP hardware

[Karl Yamashita]

Why don't you use the RTC peripheral? It'll be more accurate than using Systick and incrementing a uint64_t variable. It could drift over time due to n amount of instruction cycles it take to increment the 64 bit value.

[LCE]

What you are doing in the while loop will go wrong as soon as you do other stuff in there (that takes more than a millisecond).

Why not build a timer with a 1 ms interrupt, in its ISR you can count these 1 ms ticks with a uint64_t.

Or just hack the SysTick interrupt by incrementing an extra uint64_t variable. Or do you need "clean" HAL ?

[waclawek.jan]

> Or just hack the SysTick interrupt by incrementing an extra uint64_t variable.

...  and when using it, keep atomicity in mind.

JW

[PGump.1]

Hi,

---

@waclawek.jan wrote:

> Or just hack the SysTick interrupt by incrementing an extra uint64_t variable.

...  and when using it, keep atomicity in mind.

JW

---

If you are going to reference the uint64_t often, then, atomicity may become inconvenient. You could consider using a uint32_t variable inside the SysTick interrupt at different rate - like :-

     if ((uwTick % 10) == 0) myunit32++;    // every 10mS = 490 days'ish....

I hope this helps.

Kind regards
Pedro