PWM demo not working on nRF52840-DK

[thvdveld]

When running the PWM demo on the nRF52840-dk, nothing happens. Not even the following is printed:

nrf-hal/examples/pwm-demo/src/main.rs

Line 121 in 7d648ad

rprintln!("Press a button to start a demo");

I added a print statement in the init function, which seems to work. But after that, nothing happens.
I use cargo embed --release --target=thumbv7em-none-eabihf to run the example.