To achieve timing interval <1ms

QNX DEVELOPERS Realtime and Embedded
1

Hi ,

I am working on a critical project in QNX 6.3.0 where i need to run a particular part of a code less than 1ms.
But i found below lines in QNX help
If your CPU is 40 MHz or better, a tick is 1 ms.

Does this mean that i cannot run the timer less than 1ms.

Please help me in this regard.

regards
Pradeep

2

The OS is providing “software based” timers with the tick as the timebase, you can have thousands of them. Less than 1ms would mean a lot of overhead. You could make the tick smaller, but I would advise against that. I’d simply use another hardware timer.

3

HI,

Thanks for the quick reply,

Please suggest me how to change the tick size, Is it using clock_period() function and does this effect the hardware clock of the computer.

regards
Pradeep