SysTick

[Zek_De]

Hi guys, I am trying software timers without using interrupt

SysTick->CTRL = 0x5; 

SysTick->LOAD = 0xFFFFFF;

SysTick->VAL  = 0; 

when start the program, what will happen with SysTick->VAL  = 0; 

it is value start with 0xFFFFFF or 0?

[Tesla DeLorean]

Can you not simply observe and see experimentally?

The SysTick is a 24-bit DOWN COUNT, it typically loads the value specified, and when it gets to zero it interrupts and reloads.

[Zek_De]

Unfortunately I dont have my MCU now, I am at another city for now, but I got the point in datasheet thank you

[S.Ma]

Better study the RTC then.

Try to use interrupts with timers.

Interrupts is something important to learn.