rp-hal-boards/rp2040-hal/src/clocks/clock_sources.rs
Hmvp ffa97842e2
Improve clock frequency stuff for uninitialized clocks and add some examples (#64)
* Improve clock frequency stuff for uninitialized clocks

- Made clocks singletons so the frequency handling actually works as expected
- Added initial frequencies
- Improved the docs
- Added a Clock trait

* Add pico examples.

These have the benefit of knowing which external crystal is attached.
Even though it always should be a 12 MHz crystal.
Thus we can setup the clocks properly

I also changed the rp2040 examples to work out of the box for pico boards since that will probably be used most of the time
2021-07-26 20:24:58 +10:00

94 lines
1.9 KiB
Rust

//! Available clocks
use super::*;
use crate::{
gpio::{
bank0::{Gpio20, Gpio22},
FunctionClock, Pin,
},
pll::{Locked, PhaseLockedLoop},
rosc::{Enabled, RingOscillator},
typelevel::Sealed,
xosc::{CrystalOscillator, Stable},
};
use pac::{PLL_SYS, PLL_USB};
pub(crate) type PllSys = PhaseLockedLoop<Locked, PLL_SYS>;
impl Sealed for PllSys {}
impl ClockSource for PllSys {
fn get_freq(&self) -> Hertz {
self.operating_frequency()
}
}
pub(crate) type PllUsb = PhaseLockedLoop<Locked, PLL_USB>;
impl Sealed for PllUsb {}
impl ClockSource for PllUsb {
fn get_freq(&self) -> Hertz {
self.operating_frequency()
}
}
impl ClockSource for UsbClock {
fn get_freq(&self) -> Hertz {
self.frequency
}
}
impl ClockSource for AdcClock {
fn get_freq(&self) -> Hertz {
self.frequency
}
}
impl ClockSource for RtcClock {
fn get_freq(&self) -> Hertz {
self.frequency
}
}
impl ClockSource for SystemClock {
fn get_freq(&self) -> Hertz {
self.frequency
}
}
impl ClockSource for ReferenceClock {
fn get_freq(&self) -> Hertz {
self.frequency
}
}
pub(crate) type Xosc = CrystalOscillator<Stable>;
impl Sealed for Xosc {}
impl ClockSource for Xosc {
fn get_freq(&self) -> Hertz {
self.operating_frequency()
}
}
pub(crate) type Rosc = RingOscillator<Enabled>;
impl Sealed for Rosc {}
// We are assuming the second output is never phase shifted (see 2.17.4)
impl ClockSource for RingOscillator<Enabled> {
fn get_freq(&self) -> Hertz {
self.operating_frequency()
}
}
// GPIN0
pub(crate) type GPin0 = Pin<Gpio20, FunctionClock>;
impl ClockSource for GPin0 {
fn get_freq(&self) -> Hertz {
todo!()
}
}
// GPIN1
pub(crate) type GPin1 = Pin<Gpio22, FunctionClock>;
impl ClockSource for Pin<Gpio22, FunctionClock> {
fn get_freq(&self) -> Hertz {
todo!()
}
}