* using `stm32-hal`:
```rust
    let mut ec_timer = Timer::new_tim2(dp.TIM2, 2_400., &clock_cfg, &mut dp.RCC);
    ec_timer.enable_pwm_output(Channel::One, OutputCompare::Pwm1, CountDir::Up, 0.5);
    ec_timer.enable();
```

Also, set up the pin in analog mode. It may or may not be the default mode depending on your MCU