Trying to set up PWMs on a custom board

RE: Trying to set up PWMs on a custom board

Paul15 — Thu, 20 Oct 2022 20:56:35 GMT

Hi Oivind,

I was able to figure out the issue, it looks like this was due to an incorrect setting in the device tree.

pwm_dev0: pwm_dev0 {
pwms = <&pwm0 26 PWM_USEC(1000) PWM_POLARITY_NORMAL>;

Should be set to &pwm0 0 instead (PWM channel, not port channel)

Øivind — Thu, 20 Oct 2022 11:34:18 GMT

Try to edit blinky_pwm to use your pwm_dev0 node instead. It would be very helpful to know if that works.

Paul15 — Mon, 17 Oct 2022 15:48:43 GMT

Paul15 — Mon, 17 Oct 2022 15:47:18 GMT

Blinky is using the default pin of that project. I have tested pins 0.26 and 0.27 as GPIOs, and they are able to toggle.

Paul15 — Mon, 17 Oct 2022 15:44:37 GMT

Hi Oivind,

pwm_set_dt is returning "-22"

Øivind — Mon, 17 Oct 2022 11:27:38 GMT

To be clear, blinky_pwm works correctly with the leds on P0.26 and P0.27?

If so, could I see The full code for your main.c? And can you check the return values for the calls to pwm_set_dt()?

Paul15 — Fri, 14 Oct 2022 15:42:44 GMT

Hi Oivind,

I have tried blinky_pwm and that works correctly. Blinky is also what I used as an example for this project.

Øivind — Fri, 14 Oct 2022 11:11:37 GMT

Hi,

As a start, could you try
zephyr/samples/basic/blinky_pwm
and see if that works?

That should narrow down where the issue is.

Paul15 — Thu, 13 Oct 2022 21:46:43 GMT

Other comments:

- Program compiles correctly and is able to be flashed to the PCBA.

- Other part of the program work, so it is executing interrupts correctly.