imx6ul hrtimer problem

[wayneshih]

Hi,

I'm using imx6ulevk YOCTO sumo linux kernel L4.14.98-2.3.1.

I'm testing the minimum timing of hrtimer in imx6ul. My testing is just enable the hrtimer for a period (e.g 5 ms) and each period we toggle the gpio result.

I found that the minimum timer is only 96 micro seconds even though I set the timing to 50 micro second. It's quite slow.

In my application, I want at least 10 micro seconds timer.

Anyone have the idea?

[igorpadykov]

Hi wayneshih

reason for that may be large software overheads as linux is running many tasks

concurrently. One can try to achieve better resolution with M4 SDK (look at gpt_timer.c, epit.c)

SDK2.2_iMX6UL_WIN

Best regards
igor