PWM not working after upgrade to nrf Connect SDK 1.9.1

[csteaderman]

Since upgrading to nrf Connect SDK 1.9.1, I no longer have PWM output. No errors returned when calling pwm_pin_set_usec, yet no output.

I tried upgrading to the latest nrf Connect SDK (2.2.0), thinking that perhaps a bug was fixed, but the number of changes (include paths, etc) was too daunting.

[Sigurd Hellesvik]

Hi,

Can you post the part of your code where you use pwm_pin_set_usec()?

Regards,
Sigurd Hellesvik

[csteaderman]

#define AFE_CLOCK_NODE  DT_ALIAS(afe_clock)

#if DT_NODE_HAS_STATUS(AFE_CLOCK_NODE, okay)

#ifndef DT_PWMS_LABEL

#define AFE_CLOCK_LABEL DT_NODELABEL(AFE_CLOCK_NODE)

#else

#define AFE_CLOCK_LABEL DT_PWMS_LABEL(AFE_CLOCK_NODE)

#endif

#define AFE_CLOCK_CHANNEL   DT_PWMS_CHANNEL(AFE_CLOCK_NODE)

#define AFE_CLOCK_FLAGS DT_PWMS_FLAGS(AFE_CLOCK_NODE)

#else

#error "Unsupported board: afe-clock devicetree alias is not defined"

#define AFE_CLOCK_LABEL ""

#define AFE_CLOCK_CHANNEL   0

#define AFE_CLOCK_FLAGS 0

#endif

 

    int ret = 0;

    _AfeClock_dev = device_get_binding(AFE_CLOCK_LABEL);

    if (!_AfeClock_dev) {

        Z_LOG(LOG_LEVEL_ERR, "Error: didn't find %s device.", AFE_CLOCK_LABEL);

        ret |= 0x1;

    }

 

    ret = pwm_pin_set_usec(AfeClock_dev, AFE_CLOCK_CHANNEL,

                   PWM_USEC(period), PWM_USEC(width), AFE_CLOCK_FLAGS);

    if (ret) {

        Z_LOG(LOG_LEVEL_ERR, "Error %d: failed to set pulse width.", ret);

    }

[Sigurd Hellesvik]

The code looks good to me.

Can you try the zephyr fade_led sample on your board, to see if it behaves in the same way or not?

Regards,
Sigurd Hellesvik

[csteaderman]

Not easily. My development is beyond using dev boards, and I am running on a custom PCBA now. When I probe the GPIO line that is supposed to have the PWM signal on it, it is at 0V.

Again, this code worked on 1.6.1, but since "upgrading" to 1.9.1, the PWM output stopped working.

[Sigurd Hellesvik]

Then I have another suggestion that you can try to debug:

Use Debugging for both v1.6.0 and v1.9.1.
Inspect the PWM peripheral in the debugging interface as such:

Do you see any difference here between the versions?

Regards,
Sigurd Hellesvik

[csteaderman]

I do not have my hardware with me today. I will get back to you tomorrow with results. Thanks for the suggestion.

[csteaderman]

1.6.1:

1.9.1:

Best I can tell, they are the same.