Devicetree Visual Editor PWM signal configuration question

Question

Hi, 
 I want to implement a pwm output signal on a particular pin of the nRF52840DK working with the latest nRF Connect for VS Code. What would be the recommended way to setup the configuration using the Devicetree Visual Editor? I'm getting confused at the start as this pwm is not associated with an LED and I want to differentiate it from the default PWM LED support. What if I want 2 or 3 of these type signals? Devicetree node zephyr,user doesn't seem to support more than 1 PWM signal. 
 Thanks, 
 Ken

AHaug · Accepted Answer

Hi, 
 Øyvind is currently out of office so I'll be handling this case until he's back. 
 Ken58 said: Yes, I have seen the course, which is good, but it does not address my question 
 The PWM course does address this. If you follow along with exercise 2 you will end up with an overlay that looks like this for the nRF52840DK https://github.com/NordicDeveloperAcademy/ncs-inter/blob/main/lesson4/inter_less4_exer2_solution/boards/nrf52840dk_nrf52840.overlay i.e compatibles that are not coupled with the pmw_led instances, which is how I wrote the exercise to do. From here can set up the different channels through the Devicetree visual helper or by further modifying the overlayfile (i.e select which channels the pwm instances should use). 
 Ken58 said: The Devicetree Visual Editor can't do everything you might want. I had to edit the .overlay file directly to define the required nodes, like pwm_led_0 in your example. Correct? 
 Yes, this is correct. The proper way to do this is to do it through .overlay files or in the case of custom boards to do it in the .dts or board files directly. Think of the Devicetree helper as a "helper" and not a complete tool w.r.t how the documentations states to modify overlay-files. 
 Kind regards, Andreas