use cortex_m::peripheral::DWT;
use rcc::Clocks;
#[derive(Clone, Copy, Debug)]
pub struct Bps(pub u32);
#[derive(Clone, Copy, Debug)]
pub struct Hertz(pub u32);
#[derive(Clone, Copy, Debug)]
pub struct KiloHertz(pub u32);
#[derive(Clone, Copy, Debug)]
pub struct MegaHertz(pub u32);
pub trait U32Ext {
fn bps(self) -> Bps;
fn hz(self) -> Hertz;
fn khz(self) -> KiloHertz;
fn mhz(self) -> MegaHertz;
}
impl U32Ext for u32 {
fn bps(self) -> Bps {
Bps(self)
}
fn hz(self) -> Hertz {
Hertz(self)
}
fn khz(self) -> KiloHertz {
KiloHertz(self)
}
fn mhz(self) -> MegaHertz {
MegaHertz(self)
}
}
impl Into<Hertz> for KiloHertz {
fn into(self) -> Hertz {
Hertz(self.0 * 1_000)
}
}
impl Into<Hertz> for MegaHertz {
fn into(self) -> Hertz {
Hertz(self.0 * 1_000_000)
}
}
impl Into<KiloHertz> for MegaHertz {
fn into(self) -> KiloHertz {
KiloHertz(self.0 * 1_000)
}
}
#[derive(Clone, Copy)]
pub struct MonoTimer {
frequency: Hertz,
}
impl MonoTimer {
pub fn new(mut dwt: DWT, clocks: Clocks) -> Self {
dwt.enable_cycle_counter();
drop(dwt);
MonoTimer { frequency: clocks.sysclk(), }
}
pub fn frequency(&self) -> Hertz {
self.frequency
}
pub fn now(&self) -> Instant {
Instant { now: DWT::get_cycle_count(), }
}
}
#[derive(Clone, Copy, Debug)]
pub struct Instant {
now: u32,
}
impl Instant {
pub fn elapsed(&self) -> u32 {
DWT::get_cycle_count().wrapping_sub(self.now)
}
}