PWM pins in nrf 52840 dongle for driving servo motors

[Akshay Khairkar]

Hello, I doing the code for driving servo motors using nrf52840 dongle, in datasheet i am not able to findout the PWM pins in so i tried driving with GPIO pin(P1.13) and not getting the accurate results, please provide PWM pin-outs or reference for the same.

Accepting immediate response.

[Himanshu]

Try referring it to the examples/peripherals/pwm_driver and pwm_library. There are examples for nRF52840 DK. This should give you some insight

[Akshay Khairkar]

Why Nordic Semiconductors support not giving proper response every time i have asked the PWM pins which can used but support is telling me to refer examples/peripherals/pwm_driver and pwm_library. I have already referred  made a code according to my requirement .

Anyway it is working now.

[Himanshu]

Why did you assume that I am from Nordic Semiconductor support staff? I am a newbie to the Nordic products and have found the examples helpful. 

[Akshay Khairkar]

Ohh I am so sorry i didn't know that. So for this response

[Edvin]

Hello,

It may be true that we often refer to the examples in the SDK, but to answer your original question: Any of the pins can be PWM pins. See the dongle pinout here. Choose any of the pins that you have access to.

 

in datasheet i am not able to findout the PWM pins in so i tried driving with GPIO pin(P1.13) and not getting the accurate results,

 This is a quite vague description of the issue. You tried using pin P1.13. How did you use it? what was the observed behavior? How did you set up the PWM? 

Remember that we don't know anything about your application, nor the behavior of the chip when you run your application. This is why it is often useful to refer to examples, as Himanshu did here. In many cases, you would compare your implementation with that example, and look at the differences/similarities, and even maybe find out why the application is not working the way you intended it to do. 

 

Akshay Khairkar said:

Anyway it is working now.

 I interpret this as this ticket can be closed for now. 

Best regards,

Edvin

[Mariano]

Hi, I'm trying to setup the pwm on pin P0.9 but it does not work. I'm following the zephyr pwm blink example with nrf52840 adding this overlay configuration:

&pinctrl {

    /********************** PWM **********************/

    pwm0_default: pwm0_default {

        group1 {

            psels = <NRF_PSEL(PWM_OUT0, 0, 9)>,

                <NRF_PSEL(PWM_OUT1, 0, 10)>,

                <NRF_PSEL(PWM_OUT2, 0, 12)>;

            nordic,invert;

        };

    };

    pwm0_sleep: pwm0_sleep {

        group1 {

            psels = <NRF_PSEL(PWM_OUT0, 0, 9)>,

                <NRF_PSEL(PWM_OUT1, 0, 10)>,

                <NRF_PSEL(PWM_OUT2, 0, 12)>;

            low-power-enable;

        };

    };

};

So, I'm moving from pin P0.13 to P0.9 and I dont get any singnal in the pin. If I replace P0.9 by P0.30 in the same code I see the expected pwm on pin 30. Any clue about it is not working for the other case?

[Edvin]

P0.09 and P0.10 on the nRF52840 are set up to be NFC pins by default. To use these GPIOs as normal GPIOs, please add this line to your prj.conf file:

CONFIG_NFCT_PINS_AS_GPIOS=y

Best regards,

Edvin