PWM grouped mode

The sample demonstrates a basic functionality of the nrfx_pwm driver for a sequence loaded in the group mode.

Requirements

The sample supports the following development kits:

Board	Support	Number of LEDs expected to blink
nrf52dk_nrf52832	Yes	4
nrf52833dk_nrf52833	Yes	4
nrf52840dk_nrf52840	Yes	4
nrf5340dk_nrf5340	Yes	4
nrf54l15dk_nrf54l15	Yes	2
nrf9160dk_nrf9160	Yes	4

Overview

Application initializes the nrfx_pwm driver. It starts two-sequence playback on LEDs and replays this sequence NUM_OF_LOOPS times. The pwm_handler() is executed with a relevant log message after every loop. Additionally, it changes SEQ1 each time it is called.

‍For more information, see PWM driver - nrfx documentation.

Wiring

To run this sample, no special configuration is needed. You should monitor the output from the board to check if it is as expected.

Building and running

To run this sample, build it for the appropriate board and then flash it as per instructions in Building and running section.

Sample output

You should see the following output:

- Starting nrfx_pwm example for sequences loaded in grouped mode.
- Loops: 1 / 6
- SEQ1 changed to sequence number 2 from the seq array
- Loops: 2 / 6
- SEQ1 changed to sequence number 1 from the seq array
- Loops: 3 / 6
- SEQ1 changed to sequence number 2 from the seq array
- Loops: 4 / 6
- SEQ1 changed to sequence number 1 from the seq array
- Loops: 5 / 6
- SEQ1 changed to sequence number 2 from the seq array
- Loops: 6 / 6
- SEQ1 changed to sequence number 1 from the seq array
- PWM finished

Two or four LEDs on the development kit should blink in the following sequence:

PWM grouped example