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//! # Alternate Function I/Os
use crate::pac::{afio, AFIO};

use crate::rcc::APB2;

pub trait AfioExt {
    fn constrain(self, apb2: &mut APB2) -> Parts;
}

impl AfioExt for AFIO {
    fn constrain(self, apb2: &mut APB2) -> Parts {
        apb2.enr().modify(|_, w| w.afioen().set_bit());
        apb2.rstr().modify(|_, w| w.afiorst().set_bit());
        apb2.rstr().modify(|_, w| w.afiorst().clear_bit());

        Parts {
            evcr: EVCR { _0: () },
            mapr: MAPR { _0: () },
            exticr1: EXTICR1 { _0: () },
            exticr2: EXTICR2 { _0: () },
            exticr3: EXTICR3 { _0: () },
            exticr4: EXTICR4 { _0: () },
            mapr2: MAPR2 { _0: () },
        }
    }
}

pub struct Parts {
    pub evcr: EVCR,
    pub mapr: MAPR,
    pub exticr1: EXTICR1,
    pub exticr2: EXTICR2,
    pub exticr3: EXTICR3,
    pub exticr4: EXTICR4,
    pub mapr2: MAPR2,
}

pub struct EVCR {
    _0: (),
}

impl EVCR {
    pub fn evcr(&mut self) -> &afio::EVCR {
        unsafe { &(*AFIO::ptr()).evcr }
    }
}

pub struct MAPR {
    _0: (),
}

impl MAPR {
    pub fn mapr(&mut self) -> &afio::MAPR {
        unsafe { &(*AFIO::ptr()).mapr }
    }

    /// Disables the JTAG to free up pb3, pb4 and pa15 for normal use
    pub fn disable_jtag(&mut self) {
        self.mapr()
            .modify(|_, w| unsafe { w.swj_cfg().bits(0b010) })
    }
}

pub struct EXTICR1 {
    _0: (),
}

impl EXTICR1 {
    pub fn exticr1(&mut self) -> &afio::EXTICR1 {
        unsafe { &(*AFIO::ptr()).exticr1 }
    }
}

pub struct EXTICR2 {
    _0: (),
}

impl EXTICR2 {
    pub fn exticr2(&mut self) -> &afio::EXTICR2 {
        unsafe { &(*AFIO::ptr()).exticr2 }
    }
}

pub struct EXTICR3 {
    _0: (),
}

impl EXTICR3 {
    pub fn exticr3(&mut self) -> &afio::EXTICR3 {
        unsafe { &(*AFIO::ptr()).exticr3 }
    }
}

pub struct EXTICR4 {
    _0: (),
}

impl EXTICR4 {
    pub fn exticr4(&mut self) -> &afio::EXTICR4 {
        unsafe { &(*AFIO::ptr()).exticr4 }
    }
}

pub struct MAPR2 {
    _0: (),
}

impl MAPR2 {
    pub fn mapr2(&mut self) -> &afio::MAPR2 {
        unsafe { &(*AFIO::ptr()).mapr2 }
    }
}