Hey Gang, I have given this a grand attempt and i think i maybe missing something fundamental to making pwm with the Tcc1Pwm.  I got the code to compile but nothing is happening. I feel like im referencing everything properly. 
I've commited my code [here](https://github.com/salsasteve/atsamd/blob/feature/led_matrix_demo/boards/matrix_portal_m4/examples/pwm.rs)
If someone could point to some docs or any reference code i would greatly appreciate it. Ill im trying to do in the snippet below is blink an led with pwm.
```
let mut tcc1pwm = Tcc1Pwm::new(
        &clocks.tcc0_tcc1(&gclk0).unwrap(),
        1.kHz(),
        peripherals.TCC1,
        TCC1Pinout::Pa14(red_led),
        &mut peripherals.MCLK,
    );
    let max_duty = tcc1pwm.get_max_duty();
    let min_duty = 0;

    loop {
        tcc1pwm.set_duty(Channel::_2, max_duty);
        delay.delay_ms(1000u16);
        tcc1pwm.set_duty(Channel::_2, min_duty);
        delay.delay_ms(1000u16);
    }
```