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I am looking for ways to diagnose a problem with a vibration motor NFP-3C-03208B using Zephyr on a custom nrf5340 boardh. I have working on a nordic dk but is not working on a custom board. The device appears to be ready but not working or erroring when using. It appears to be initializing:

static const struct pwm_dt_spec vib_motor = PWM_DT_SPEC_GET(DT_ALIAS(vibrator_pwm));

and is ready:

if (!device_is_ready(vib_motor.dev)) {
    LOG_ERR("Vibration motor control not supported");
    return -ENODEV;
} else {
    LOG_DBG("Vibration Motor is ready");

    if (vib_motor.dev->name) {
        LOG_DBG("Vibration Motor name: %s", vib_motor.dev->name);
    } else {
       LOG_DBG("Vibration Motor name is NULL");
    }
}

as seen from the rtt log:

00> [00:00:00.684,783] <dbg> vibration_manager: vibration_manager_init: Vibration Motor is ready
00> [00:00:00.684,814] <dbg> vibration_manager: vibration_manager_init: Vibration Motor name: pwm@22000

but when I test it, nothing happens. It's the same code as I use on the dk which is working with the same motor:

ret = pwm_set_pulse_dt(&vib_motor, pulse_width);
if (ret < 0) {
    LOG_ERR("Failed to set pulse width: %i", ret);
    return;
}

The dtsi has this:

&pinctrl {

    ...

    pwm1_default: pwm1_default {
        group1 {
            psels = <NRF_PSEL(PWM_OUT1, 0, 18)>;
        };
    };

    pwm1_sleep: pwm1_sleep {
        group1 {
            psels = <NRF_PSEL(PWM_OUT1, 0, 18)>;
            low-power-enable;
        };
    };
};

The dts:

/ {
    ...

    pwmleds {
        compatible = "pwm-leds";
    
        vibrator_pwm: pwm_led_1 {
            pwms = <&pwm1 0 20000 PWM_POLARITY_NORMAL>;
            label = "Vibration Motor";
        };
    };
};

&pwm1 {
    status = "okay";
    pinctrl-0 = <&pwm1_default>;
    pinctrl-1 = <&pwm1_sleep>;
    pinctrl-names = "default", "sleep";
};

And the overlay has:

    aliases {
        vibrator-pwm = &vibrator_pwm;
    };

Any ideas on how I should diagnose further would be a great help.

Improve this question
1
  • When a zephyr project works on a DK but not a custom board, I usually recommend that you compare build/zephyr/.config between the DK build and the custom board build. This will show any differences in Kconfig files. Then do the same for build/zephyr/zephyr.dts. You should not expect these to be identical, but it is a good way to narrow down the possibilities Commented May 2 at 14:20
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