nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

Edvin — Mon, 17 Mar 2025 08:59:23 GMT

It is possible to increase the output on the nRF53 using the VREGHVOUT register. This won't work on the Audio DK, because there are some regulators going in to the chip, and the VDD can't be higher than the supplied voltage. But on a custom board, you can set the pin voltage up to 3.3V.

Best regards,

Edvin

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Sat, 15 Mar 2025 10:54:17 GMT

Thanks, Edvin. I found the issue—my LED is designed for 3V, but the GPIO is only outputting approximately 1.5V, which is why it isn’t lighting up. The reason I was confused is that when I connected the LED to VBUS and GND, it lit up since VBUS outputs approximately 5V.

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

Edvin — Fri, 14 Mar 2025 23:38:50 GMT

Oh sorry, I referred to the red LED in the blank plastic window in the middle. I didn't actually measure the voltage on the pin header, where you have connected the external LED.

But have you tried measuring the pin with a multimeter/voltmeter? And what voltage does your LED require? And are you sure you put the LED in the right orientation? Have you tried connecting it the other way?

Best regards,

Edvin

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Fri, 14 Mar 2025 04:16:26 GMT

hi Edvin I tested your code it is still same I am attaching the photo as zip, You can see that external LED connected is not glowing, pwm0 is still blinking in red, even after you disabled it.I tested it in 2 boards

devzone.nordicsemi.com/.../nrfPhoto.zip

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

Edvin — Thu, 13 Mar 2025 14:50:20 GMT

[quote user="Edvin Holmseth"]

Or alternatively, instead of using /delete-node/, you could move the pin used for pwm_led_0, by adding this to your .overlay file:

[/quote]

If you would have tried this, you would have seen that it worked.

However, I found it better to disable the PWM, since it is not being used. Please see the attached project:

devzone.nordicsemi.com/.../fade_5F00_led_5F00_1_5F00_no_5F00_pwm.zip

Best regards,

Edvin

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Thu, 13 Mar 2025 12:41:50 GMT

Or do you have any sample code for Audio DK to make any GPIO pin to high state,

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Wed, 12 Mar 2025 15:42:31 GMT

devzone.nordicsemi.com/.../fade_5F00_led_5F00_1.rar

My NCS version is 2.9.0. Yes target board is nrf5340 Audio DK

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

Edvin — Wed, 12 Mar 2025 13:42:40 GMT

Can you please .zip and upload the entire application folder, so that I can run it on my desk?

You are building for the target board nrf5340_audio_dk/nrf5340/cpuapp, right? What NCS version are you using?

Best regards,

Edvin

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Wed, 12 Mar 2025 10:26:30 GMT

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/printk.h>

static const struct gpio_dt_spec spec = GPIO_DT_SPEC_GET(DT_ALIAS(newpin), testpin_gpios);

int main(void)
{
    int ret;

    if (!gpio_is_ready_dt(&spec)) {
        printk("Error: GPIO device %s is not ready\n", spec.port->name);
        return 0;
    }

    ret = gpio_pin_configure_dt(&spec, GPIO_OUTPUT_ACTIVE);
    if (ret < 0) {
        printk("Error %d: Failed to configure GPIO pin\n", ret);
        return 0;
    }

    printk("Setting GPIO HIGH on %d \n",spec.pin);

    /* Set GPIO HIGH */
    gpio_pin_set_dt(&spec, 1);

    while (1) {
        k_sleep(K_FOREVER); // Keep running
    }
	return 0;
}

Above is my code I am not referring any PWM , I tried P0.08 also. But I am not getting any voltage in GPIO.

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

Edvin — Wed, 12 Mar 2025 09:25:12 GMT

Yes, you would need to remove all references to pwm0 in your application. It is probably easier to use another pin, instead of the P0.07.

Or alternatively, instead of using /delete-node/, you could move the pin used for pwm_led_0, by adding this to your .overlay file:

&pinctrl {
	pwm0_default: pwm0_default {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 8)>,
				<NRF_PSEL(PWM_OUT1, 0, 25)>,
				<NRF_PSEL(PWM_OUT2, 0, 26)>;
		};
	};

	pwm0_sleep: pwm0_sleep {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 8)>,
				<NRF_PSEL(PWM_OUT1, 0, 25)>,
				<NRF_PSEL(PWM_OUT2, 0, 26)>;
			low-power-enable;
		};
	};
};

But note that P0.07 will still be physically connected to the LED on the Audio DK.

Also note that I now moved the first PWM channel to pin P0.08, but you can move it to any pin you'd prefer, that is free.

BR,

Edvin

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Wed, 12 Mar 2025 07:25:07 GMT

When i am adding "

/delete-node/ &pwm0;"

/{
	testpin: zephyr,user {
		testpin-gpios = <&gpio0 7 0>;
	};

	aliases {
		newpin = &testpin;
	};
};

&gpio0 {
	status = "okay";
};

&gpiote {
	status = "okay";
};

/delete-node/ &pwm0;

I am getting error "devicetree error: /pwmleds/pwm_led_0: undefined node label 'pwm0'"

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

Edvin — Tue, 11 Mar 2025 14:37:05 GMT

Hello,

So it is P0.07 you want to control, right?

By default, this is connected to the red RGB led. Software wise, it is being controlled by PWM0, channel 0:

(this is from NCS\zephyr\boards\nordic\nrf5340_audio_dk\nrf5340_audio_dk_nrf5340_cpuapp_common.dtsi)

I have not tested this from the application, but you can try to add a file, nrf5340_audio_dk_nrf5340_cpuapp.overlay in your application's root folder (same folder as the CMakeLists.txt), and add the following line to it:

/delete-node/ &pwm0;

This will, however, disable the RGB leds on the Audio DK.

You would probably see, if you made your application set the color to red (without the line above), see that the voltage would be high.

Best regards,

Edvin

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Tue, 11 Mar 2025 07:16:01 GMT

I tested with blinky example, I changed the pin in overlay file like below. I am not getting any voltage in GPIO pin P0.08. When configure it to P0.07 or P0.25 built-in Leds are flashing without issue.

&rgb1_red {
	gpios = <&gpio0 8 0>;
};

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

saurabh — Mon, 10 Mar 2025 16:29:35 GMT

P0.07/AIN3 RGB LED 1 Red color input pin this is default connection on nRF5340 Audio dk board can you check on P0.08 and check your firmware is working or not.

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

saurabh — Mon, 10 Mar 2025 16:22:40 GMT

Can you check by blinking led in loop and see any changes in voltage

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

arun98475 — Mon, 10 Mar 2025 16:07:38 GMT

that is working fine, here also in built-in led is working. But if i connect an external led in P0.07 and GND it is not working

RE: nRF5340 Audio DK: GPIO P0.07 Not Outputting High?

saurabh — Mon, 10 Mar 2025 15:56:33 GMT

Hello Arun can you try blinky example