```
    // Set up the timer so the clocks are configured
    let mut latch_timer = hal::timer::Timer::tim2(p.TIM2, 250.khz(), clocks, &mut rcc.apb1);
    // Turn up the update interrupt
    latch_timer.listen(hal::timer::Event::TimeOut);
    // Get our raw timer back so we can configure PWM now that PSC (prescaler)
    // and ARR (auto-reload register) have been set for us.
    p.TIM2 = latch_timer.free();
    // enable PWM output mode 1 (OC1M=7) with pre-load enabled on channel 1
    p.TIM2
        .ccmr1_output()
        .modify(|_r, w| unsafe { w.oc1m().bits(7).oc1pe().set_bit() });
    // set up an output pulse of 5 clock cycles on channel 1
    p.TIM2.ccr1.write(|w| unsafe { w.bits(5) });
    // Enable the output
    p.TIM2.ccer.modify(|_, w| w.cc1e().set_bit());
    // set auto-reload
    p.TIM2.cr1.modify(|_, w| w.arpe().set_bit());
    // Initialise the registers
    p.TIM2.egr.write(|w| w.ug().set_bit());
    // turn the timer back on
    p.TIM2.cr1.modify(|_, w| w.cen().set_bit());
```