Hello, I'm using an stm32f103C8 and trying to produce a precise delay funcion. I'm using a HSE of 72Mhz so a I supposed the clock cycle is equal to 13.8ns. The delay function is simply a while(count--) where count has the specific number of times for looping to gain the requested time. I made an hypothese that while(count--) takes 3 cycles to execute. So when I need to make 1µs delay I put 24 in count.
But I found that I make 4us with count =24 that means 4 times the desired time. Please can you help identify this problem?
Change your controller if it doesn't have a TIMER.
"Despite the capability of most timers, we still see people totally ignoring them, trying to do everything in software - including basic delays as counted number of iterations of a busy loop." - Per Westermark
Hello Sir, Do you suggest that I merge to Timer or systick? Did you encounter problems with software delay before and can you please tell me what are the causes of this problem
Use whichever meets your requirements!
SysTick, as the name suggests, is specifically intended for providing a System timing "Tick" to software.
Other timers tend to have far more flexibility for many more applications - so it may be a "waste" to use one where SysTick would do...
Only you know the specific requirements & constraints of your particular project - so only you can decide.