chVTGetSystemTime() restarts every 4s !!!!

[jonesrayan]

Hinthanks for this detailed answer, polled delay function you mean the oroginal funcion of arduino like delaymicroseconds() ??

[jonesrayan]

what do you mean by polled delay function ??.

[Giovanni]

Hinthanks for this detailed answer, polled delay function you mean the oroginal funcion of arduino like delaymicroseconds() ??

yes

[jonesrayan]

And it does'nt effect the performance of chibios ?? if i put a delaymicroseconds() in a thead ?.
i need those information because i"m building a quadcopter so i have to know what danger and what's safe

[Giovanni]

Of course it does affect the performance, that function wastes time into a loop. Your other option is to use hardware timers to generate those output signals.

You would be served better by an MCU with hardware PWMs.

Giovanni