atsamd-hal 0.5.0

HAL and Peripheral access API for ATSAMD21 and ATSAMD51 microcontrollers
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use crate::gpio::{Pa19, Pa15, PfE};
use crate::clock;
use crate::timer::TimerParams;
use crate::time::Hertz;
use crate::hal::PwmPin;

use crate::target_device::{TC3, PM};

pub enum TC3Pinout {
    Pa15(Pa15<PfE>),
    Pa19(Pa19<PfE>),
}

pub enum Channel { 
    C0
}

macro_rules! pwm {
    ($($TYPE:ident: ($TC:ident, $pinout:ident, $clock:ident, $apmask:ident, $apbits:ident, $wrapper:ident),)+) => {
        $(

pub struct $TYPE {
    /// The frequency of the attached clock, not the period of the pwm.
    /// Used to calculate the period of the pwm.
    clock_freq: Hertz,
    tc: $TC,
    #[allow(dead_code)]
    pinout: $pinout,
}

impl $TYPE {
    pub fn new<F: Into<Hertz>> (
        clock: &clock::$clock,
        freq: F,
        tc: $TC,
        pinout: $pinout,
        pm: &mut PM,
    ) -> Self {
        let freq = freq.into();
        {
            let count = tc.count16();
            let params = TimerParams::new(freq, clock.freq().0);
            pm.$apmask.modify(|_, w| w.$apbits().set_bit());
            count.ctrla.write(|w| w.swrst().set_bit());
            while count.ctrla.read().bits() & 1 != 0 {}
            count.ctrla.modify(|_, w| w.enable().clear_bit());
            count.ctrla.modify(|_, w| {
                match params.divider {
                    1 => w.prescaler().div1(),
                    2 => w.prescaler().div2(),
                    4 => w.prescaler().div4(),
                    8 => w.prescaler().div8(),
                    16 => w.prescaler().div16(),
                    64 => w.prescaler().div64(),
                    256 => w.prescaler().div256(),
                    1024 => w.prescaler().div1024(),
                    _ => unreachable!(),
                }
            });
            count.ctrla.write(|w| w.wavegen().mpwm());
            count.cc[0].write(|w| unsafe { w.cc().bits(params.cycles as u16) });
            count.cc[1].write(|w| unsafe { w.cc().bits(0) });
            count.ctrla.modify(|_, w| w.enable().set_bit());
        }

        Self {
            clock_freq: clock.freq(),
            tc,
            pinout,
        }
    }

    pub fn set_period<P>(&mut self, period: P)
    where
        P: Into<Hertz>
    {
        let period = period.into();
        let params = TimerParams::new(period, self.clock_freq.0);
        let count = self.tc.count16();
        count.ctrla.modify(|_, w| w.enable().clear_bit());
        count.ctrla.modify(|_, w| {
                match params.divider {
                    1 => w.prescaler().div1(),
                    2 => w.prescaler().div2(),
                    4 => w.prescaler().div4(),
                    8 => w.prescaler().div8(),
                    16 => w.prescaler().div16(),
                    64 => w.prescaler().div64(),
                    256 => w.prescaler().div256(),
                    1024 => w.prescaler().div1024(),
                    _ => unreachable!(),
                }
            });
        count.ctrla.modify(|_, w| w.enable().set_bit());
        count.cc[0].write(|w| unsafe { w.cc().bits(params.cycles as u16) });
    }

    pub fn get_period(&self) -> Hertz {
        let count = self.tc.count16();
        let divisor = count.ctrla.read().prescaler().bits(); 
        let top = count.cc[0].read().cc().bits();
        Hertz(self.clock_freq.0 / divisor as u32 / (top + 1) as u32)
    }
}

impl PwmPin for $TYPE {
    type Duty = u16;

    fn disable(&mut self) {
        let count = self.tc.count16();
        count.ctrla.modify(|_, w| w.enable().clear_bit());
    }

    fn enable(&mut self) {
        let count = self.tc.count16();
        count.ctrla.modify(|_, w| w.enable().set_bit());
    }


    fn get_duty(&self) -> Self::Duty {
        let count = self.tc.count16();
        let duty: u16 = count.cc[1].read().cc().bits();
        duty 
    }

    fn get_max_duty(&self) -> Self::Duty {
        let count = self.tc.count16();
        let top = count.cc[0].read().cc().bits();
        top
    }

    fn set_duty(&mut self, duty: Self::Duty) {
        let count = self.tc.count16();
        count.cc[1].write(|w| unsafe {w.cc().bits(duty)});
    }
}

)+}}

pwm! {
    Pwm3: (TC3, TC3Pinout, Tcc2Tc3Clock, apbcmask, tc3_, Pwm3Wrapper),
}