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stm32/rcc: switch to modern api for l0, l1.

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This commit is contained in:
Dario Nieuwenhuis 2023-11-05 03:06:13 +01:00
parent 056c409443
commit 8911a4d855
8 changed files with 124 additions and 112 deletions
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197
embassy-stm32/src/rcc/l0l1.rs
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@ -1,8 +1,8 @@
pub use crate::pac::pwr::vals::Vos as VoltageScale;
pub use crate::pac::rcc::vals::{
Hpre as AHBPrescaler, Msirange as MSIRange, Plldiv as PLLDiv, Pllmul as PLLMul, Ppre as APBPrescaler,
Hpre as AHBPrescaler, Msirange as MSIRange, Plldiv as PLLDiv, Plldiv as PllDiv, Pllmul as PLLMul, Pllmul as PllMul,
Pllsrc as PLLSource, Ppre as APBPrescaler, Sw as ClockSrc,
};
use crate::pac::rcc::vals::{Pllsrc, Sw};
#[cfg(crs)]
use crate::pac::{crs, CRS, SYSCFG};
use crate::pac::{FLASH, PWR, RCC};
@ -12,39 +12,50 @@ use crate::time::Hertz;
/// HSI speed
pub const HSI_FREQ: Hertz = Hertz(16_000_000);
/// System clock mux source
#[derive(Clone, Copy)]
pub enum ClockSrc {
MSI(MSIRange),
PLL(PLLSource, PLLMul, PLLDiv),
HSE(Hertz),
HSI,
#[derive(Clone, Copy, Eq, PartialEq)]
pub enum HseMode {
/// crystal/ceramic oscillator (HSEBYP=0)
Oscillator,
/// external analog clock (low swing) (HSEBYP=1)
Bypass,
}
/// PLL clock input source
#[derive(Clone, Copy)]
pub enum PLLSource {
HSI,
HSE(Hertz),
#[derive(Clone, Copy, Eq, PartialEq)]
pub struct Hse {
/// HSE frequency.
pub freq: Hertz,
/// HSE mode.
pub mode: HseMode,
}
impl From<PLLSource> for Pllsrc {
fn from(val: PLLSource) -> Pllsrc {
match val {
PLLSource::HSI => Pllsrc::HSI,
PLLSource::HSE(_) => Pllsrc::HSE,
}
}
#[derive(Clone, Copy)]
pub struct Pll {
/// PLL source
pub source: PLLSource,
/// PLL multiplication factor.
pub mul: PllMul,
/// PLL main output division factor.
pub div: PllDiv,
}
/// Clocks configutation
pub struct Config {
// base clock sources
pub msi: Option<MSIRange>,
pub hsi: bool,
pub hse: Option<Hse>,
#[cfg(crs)]
pub hsi48: bool,
pub pll: Option<Pll>,
pub mux: ClockSrc,
pub ahb_pre: AHBPrescaler,
pub apb1_pre: APBPrescaler,
pub apb2_pre: APBPrescaler,
#[cfg(crs)]
pub enable_hsi48: bool,
pub ls: super::LsConfig,
pub voltage_scale: VoltageScale,
}
@ -53,12 +64,18 @@ impl Default for Config {
#[inline]
fn default() -> Config {
Config {
mux: ClockSrc::MSI(MSIRange::RANGE5),
msi: Some(MSIRange::RANGE5),
hse: None,
hsi: false,
#[cfg(crs)]
hsi48: false,
pll: None,
mux: ClockSrc::MSI,
ahb_pre: AHBPrescaler::DIV1,
apb1_pre: APBPrescaler::DIV1,
apb2_pre: APBPrescaler::DIV1,
#[cfg(crs)]
enable_hsi48: false,
voltage_scale: VoltageScale::RANGE1,
ls: Default::default(),
}
@ -71,72 +88,68 @@ pub(crate) unsafe fn init(config: Config) {
PWR.cr().write(|w| w.set_vos(config.voltage_scale));
while PWR.csr().read().vosf() {}
let (sys_clk, sw) = match config.mux {
ClockSrc::MSI(range) => {
// Set MSI range
RCC.icscr().write(|w| w.set_msirange(range));
// Enable MSI
RCC.cr().write(|w| w.set_msion(true));
while !RCC.cr().read().msirdy() {}
let freq = 32_768 * (1 << (range as u8 + 1));
(Hertz(freq), Sw::MSI)
}
ClockSrc::HSI => {
// Enable HSI
RCC.cr().write(|w| w.set_hsion(true));
while !RCC.cr().read().hsirdy() {}
(HSI_FREQ, Sw::HSI)
}
ClockSrc::HSE(freq) => {
// Enable HSE
RCC.cr().write(|w| w.set_hseon(true));
while !RCC.cr().read().hserdy() {}
(freq, Sw::HSE)
}
ClockSrc::PLL(src, mul, div) => {
let freq = match src {
PLLSource::HSE(freq) => {
// Enable HSE
RCC.cr().write(|w| w.set_hseon(true));
while !RCC.cr().read().hserdy() {}
freq
}
PLLSource::HSI => {
// Enable HSI
RCC.cr().write(|w| w.set_hsion(true));
while !RCC.cr().read().hsirdy() {}
HSI_FREQ
}
};
// Disable PLL
RCC.cr().modify(|w| w.set_pllon(false));
while RCC.cr().read().pllrdy() {}
let freq = freq * mul / div;
assert!(freq <= Hertz(32_000_000));
RCC.cfgr().write(move |w| {
w.set_pllmul(mul);
w.set_plldiv(div);
w.set_pllsrc(src.into());
});
// Enable PLL
RCC.cr().modify(|w| w.set_pllon(true));
while !RCC.cr().read().pllrdy() {}
(freq, Sw::PLL1_P)
}
};
let rtc = config.ls.init();
let msi = config.msi.map(|range| {
RCC.icscr().modify(|w| w.set_msirange(range));
RCC.cr().modify(|w| w.set_msion(true));
while !RCC.cr().read().msirdy() {}
Hertz(32_768 * (1 << (range as u8 + 1)))
});
let hsi = config.hsi.then(|| {
RCC.cr().modify(|w| w.set_hsion(true));
while !RCC.cr().read().hsirdy() {}
HSI_FREQ
});
let hse = config.hse.map(|hse| {
RCC.cr().modify(|w| {
w.set_hsebyp(hse.mode == HseMode::Bypass);
w.set_hseon(true);
});
while !RCC.cr().read().hserdy() {}
hse.freq
});
let pll = config.pll.map(|pll| {
let freq = match pll.source {
PLLSource::HSE => hse.unwrap(),
PLLSource::HSI => hsi.unwrap(),
};
// Disable PLL
RCC.cr().modify(|w| w.set_pllon(false));
while RCC.cr().read().pllrdy() {}
let freq = freq * pll.mul / pll.div;
assert!(freq <= Hertz(32_000_000));
RCC.cfgr().write(move |w| {
w.set_pllmul(pll.mul);
w.set_plldiv(pll.div);
w.set_pllsrc(pll.source);
});
// Enable PLL
RCC.cr().modify(|w| w.set_pllon(true));
while !RCC.cr().read().pllrdy() {}
freq
});
let sys_clk = match config.mux {
ClockSrc::HSE => hse.unwrap(),
ClockSrc::HSI => hsi.unwrap(),
ClockSrc::MSI => msi.unwrap(),
ClockSrc::PLL1_P => pll.unwrap(),
};
let wait_states = match (config.voltage_scale, sys_clk.0) {
(VoltageScale::RANGE1, ..=16_000_000) => 0,
(VoltageScale::RANGE2, ..=8_000_000) => 0,
@ -150,7 +163,7 @@ pub(crate) unsafe fn init(config: Config) {
FLASH.acr().modify(|w| w.set_latency(wait_states != 0));
RCC.cfgr().modify(|w| {
w.set_sw(sw);
w.set_sw(config.mux);
w.set_hpre(config.ahb_pre);
w.set_ppre1(config.apb1_pre);
w.set_ppre2(config.apb2_pre);
@ -161,7 +174,7 @@ pub(crate) unsafe fn init(config: Config) {
let (pclk2, pclk2_tim) = super::util::calc_pclk(hclk1, config.apb2_pre);
#[cfg(crs)]
if config.enable_hsi48 {
if config.hsi48 {
// Reset CRS peripheral
RCC.apb1rstr().modify(|w| w.set_crsrst(true));
RCC.apb1rstr().modify(|w| w.set_crsrst(false));

3
embassy-stm32/src/rcc/l4l5.rs
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@ -193,9 +193,6 @@ pub(crate) unsafe fn init(config: Config) {
});
while !RCC.cr().read().msirdy() {}
// Enable as clock source for USB, RNG if running at 48 MHz
if range == MSIRange::RANGE48M {}
msirange_to_hertz(range)
});

2
examples/stm32l0/src/bin/button_exti.rs
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@ -12,7 +12,7 @@ use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut config = Config::default();
config.rcc.enable_hsi48 = true;
config.rcc.hsi48 = true;
let p = embassy_stm32::init(config);
let button = Input::new(p.PB2, Pull::Up);

2
examples/stm32l0/src/bin/lora_cad.rs
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@ -24,7 +24,7 @@ const LORA_FREQUENCY_IN_HZ: u32 = 903_900_000; // warning: set this appropriatel
async fn main(_spawner: Spawner) {
let mut config = embassy_stm32::Config::default();
config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSI;
config.rcc.enable_hsi48 = true;
config.rcc.hsi48 = true;
let p = embassy_stm32::init(config);
let mut spi_config = spi::Config::default();

2
examples/stm32l0/src/bin/lora_lorawan.rs
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@ -34,7 +34,7 @@ const LORAWAN_REGION: region::Region = region::Region::EU868; // warning: set th
async fn main(_spawner: Spawner) {
let mut config = embassy_stm32::Config::default();
config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSI;
config.rcc.enable_hsi48 = true;
config.rcc.hsi48 = true;
let p = embassy_stm32::init(config);
let mut spi_config = spi::Config::default();

2
examples/stm32l0/src/bin/lora_p2p_receive.rs
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@ -24,7 +24,7 @@ const LORA_FREQUENCY_IN_HZ: u32 = 903_900_000; // warning: set this appropriatel
async fn main(_spawner: Spawner) {
let mut config = embassy_stm32::Config::default();
config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSI;
config.rcc.enable_hsi48 = true;
config.rcc.hsi48 = true;
let p = embassy_stm32::init(config);
let mut spi_config = spi::Config::default();

2
examples/stm32l0/src/bin/lora_p2p_send.rs
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@ -24,7 +24,7 @@ const LORA_FREQUENCY_IN_HZ: u32 = 903_900_000; // warning: set this appropriatel
async fn main(_spawner: Spawner) {
let mut config = embassy_stm32::Config::default();
config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSI;
config.rcc.enable_hsi48 = true;
config.rcc.hsi48 = true;
let p = embassy_stm32::init(config);
let mut spi_config = spi::Config::default();

26
tests/stm32/src/common.rs
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@ -460,23 +460,25 @@ pub fn config() -> Config {
#[cfg(feature = "stm32l073rz")]
{
use embassy_stm32::rcc::*;
config.rcc.mux = ClockSrc::PLL(
// 32Mhz clock (16 * 4 / 2)
PLLSource::HSI,
PLLMul::MUL4,
PLLDiv::DIV2,
);
config.rcc.hsi = true;
config.rcc.pll = Some(Pll {
source: PLLSource::HSI,
mul: PLLMul::MUL4,
div: PLLDiv::DIV2, // 32Mhz clock (16 * 4 / 2)
});
config.rcc.mux = ClockSrc::PLL1_P;
}
#[cfg(any(feature = "stm32l152re"))]
{
use embassy_stm32::rcc::*;
config.rcc.mux = ClockSrc::PLL(
// 32Mhz clock (16 * 4 / 2)
PLLSource::HSI,
PLLMul::MUL4,
PLLDiv::DIV2,
);
config.rcc.hsi = true;
config.rcc.pll = Some(Pll {
source: PLLSource::HSI,
mul: PLLMul::MUL4,
div: PLLDiv::DIV2, // 32Mhz clock (16 * 4 / 2)
});
config.rcc.mux = ClockSrc::PLL1_P;
}
config