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stm32/rcc: Add support for HSE Oscillator in stm32g0

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This commit is contained in:
Carlos Barrales Ruiz 2023-11-27 15:00:48 +01:00 committed by Dario Nieuwenhuis
parent b867f9b5b6
commit 09592ffa6a
1 changed files with 21 additions and 7 deletions
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28
embassy-stm32/src/rcc/g0.rs
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@ -10,10 +10,18 @@ use crate::time::Hertz;
/// HSI speed
pub const HSI_FREQ: Hertz = Hertz(16_000_000);
#[derive(Clone, Copy, Eq, PartialEq)]
pub enum HseMode {
/// crystal/ceramic oscillator (HSEBYP=0)
Oscillator,
/// external analog clock (low swing) (HSEBYP=1)
Bypass,
}
/// System clock mux source
#[derive(Clone, Copy)]
pub enum ClockSrc {
HSE(Hertz),
HSE(Hertz, HseMode),
HSI(HSIPrescaler),
PLL(PllConfig),
LSI,
@ -61,7 +69,7 @@ impl Default for PllConfig {
#[derive(Clone, Copy, Eq, PartialEq)]
pub enum PllSource {
HSI,
HSE(Hertz),
HSE(Hertz, HseMode),
}
/// Clocks configutation
@ -90,7 +98,7 @@ impl PllConfig {
pub(crate) fn init(self) -> Hertz {
let (src, input_freq) = match self.source {
PllSource::HSI => (vals::Pllsrc::HSI, HSI_FREQ),
PllSource::HSE(freq) => (vals::Pllsrc::HSE, freq),
PllSource::HSE(freq, _) => (vals::Pllsrc::HSE, freq),
};
let m_freq = input_freq / self.m;
@ -125,8 +133,11 @@ impl PllConfig {
RCC.cr().write(|w| w.set_hsion(true));
while !RCC.cr().read().hsirdy() {}
}
PllSource::HSE(_) => {
RCC.cr().write(|w| w.set_hseon(true));
PllSource::HSE(_, mode) => {
RCC.cr().write(|w| {
w.set_hsebyp(mode != HseMode::Oscillator);
w.set_hseon(true);
});
while !RCC.cr().read().hserdy() {}
}
}
@ -177,9 +188,12 @@ pub(crate) unsafe fn init(config: Config) {
(HSI_FREQ / div, Sw::HSI)
}
ClockSrc::HSE(freq) => {
ClockSrc::HSE(freq, mode) => {
// Enable HSE
RCC.cr().write(|w| w.set_hseon(true));
RCC.cr().write(|w| {
w.set_hseon(true);
w.set_hsebyp(mode != HseMode::Oscillator);
});
while !RCC.cr().read().hserdy() {}
(freq, Sw::HSE)