WFI instruction

takafuminaka — Fri, 11 Jul 2014 06:21:07 GMT

Hi chipexpert.

After returning from WFI instruction, 5% of our custom boards doesn't work properly.

For example, after calling WFI instruction,

PWM doesn't output any signal(always LOW or HIGH) until 1msec timer interrupt happens.

Is there any procedure for using WFI instructnion?

Is it possible to use WFI instruction with iMX6 Solo processor?

Our BSP is "Custom Board" based Collage(by Sophia Systems Japan).

Regards,

Takafumi.

Re: WFI instruction

igorpadykov — Sat, 12 Jul 2014 13:59:16 GMT

Hi Takafumi

yes, definitely it is possible (and necessary)

to use WFI instruction with iMX6 Solo processor.

I would suggest to start search cause of this misbehaviour by narrowing

down possible reasons: software, hardware.

Please start with SDK low power test (SDK/apps/power_modes_test)

and check if it will work.

Other option - run minimal image (without GPU,VPU, GUI).

This may point to power supply issues (spikes, bad filtering) on power lines.

Best regards

chip

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