PWM

The PWM sample demonstrates how to configure and use Pulse Width Modulation (PWM) with nRF Connect SDK Bare Metal option.

Requirements

The sample supports the following development kits:

Simple board variantsMCUboot board variants

The following board variants do not have DFU capabilities:

S115:

Hardware platform	PCA	Board target
nRF54L15 DK	PCA10156	bm_nrf54l15dk/nrf54l15/cpuapp/s115_softdevice
nRF54L15 DK (emulating nRF54L10)	PCA10156	bm_nrf54l15dk/nrf54l10/cpuapp/s115_softdevice
nRF54L15 DK (emulating nRF54L05)	PCA10156	bm_nrf54l15dk/nrf54l05/cpuapp/s115_softdevice
nRF54LM20 DK	PCA10184	bm_nrf54lm20dk/nrf54lm20a/cpuapp/s115_softdevice

S145:

Hardware platform	PCA	Board target
nRF54L15 DK	PCA10156	bm_nrf54l15dk/nrf54l15/cpuapp/s145_softdevice
nRF54L15 DK (emulating nRF54L10)	PCA10156	bm_nrf54l15dk/nrf54l10/cpuapp/s145_softdevice
nRF54L15 DK (emulating nRF54L05)	PCA10156	bm_nrf54l15dk/nrf54l05/cpuapp/s145_softdevice
nRF54LM20 DK	PCA10184	bm_nrf54lm20dk/nrf54lm20a/cpuapp/s145_softdevice

Overview

The sample initializes a PWM instance that blinks LED 1 and LED 3 on the device.

Note

This sample uses GPIO pins connected to LEDs to demonstrate PWM functionality. The PWM signal can only be exposed on GPIO pins that belong to the same domain as the PWM instance. This limits which LEDs on a given DK can be used. For example, on the nRF54L Series, PWM20/21/22 and GPIO Port P1 share the same domain. Therefore, on the nRF54L15 DK, only LEDs connected to P1 work with PWM: LED 1 and LED 3.

User interface

LED 0:

Lit when the device is initialized.

LED 1:

Breathing pattern.

LED 3:

Breathing pattern.

Building and running

This sample can be found under samples/peripherals/pwm/ in the Bare Metal folder structure.

For details on how to create, configure, and program a sample, see Getting Started with the samples.

Testing

You can test this sample by performing the following steps:

1. Compile and program the application.

2. Observe that the PWM sample initialized message is printed.

3. Observe that LED 1 and LED 3 have a breathing pattern.