1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

use crate::pac::{RCC, SYSCFG};
use crate::rcc::Enable;
use core::fmt;
use core::ops::Deref;

/// Extension trait that constrains the `SYSCFG` peripheral
pub trait SysCfgExt {
    /// Constrains the `SYSCFG` peripheral so it plays nicely with the other abstractions
    fn constrain(self) -> SysCfg;
}

impl SysCfgExt for SYSCFG {
    fn constrain(self) -> SysCfg {
        unsafe {
            // NOTE(unsafe) this reference will only be used for atomic writes with no side effects.
            let rcc = &(*RCC::ptr());

            // Enable clock.
            SYSCFG::enable(rcc);
        }

        SysCfg(self)
    }
}

pub struct SysCfg(SYSCFG);

impl Deref for SysCfg {
    type Target = SYSCFG;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

#[cfg(feature = "defmt")]
impl defmt::Format for SysCfg {
    fn format(&self, f: defmt::Formatter) {
        defmt::write!(f, "SysCfg(SYSCFG)");
    }
}

impl fmt::Debug for SysCfg {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("SysCfg").finish()
    }
}