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l.rs
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#[cfg(any(stm32l0, stm32l1))]
pub use crate::pac::pwr::vals::Vos as VoltageScale;
use crate::pac::rcc::regs::Cfgr;
#[cfg(any(stm32wb, stm32wl))]
pub use crate::pac::rcc::vals::Hsepre as HsePrescaler;
pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Msirange as MSIRange, Ppre as APBPrescaler, Sw as Sysclk};
use crate::pac::{FLASH, RCC};
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,
}
#[derive(Clone, Copy, Eq, PartialEq)]
pub struct Hse {
/// HSE frequency.
pub freq: Hertz,
/// HSE mode.
pub mode: HseMode,
/// HSE prescaler
#[cfg(any(stm32wb, stm32wl))]
pub prescaler: HsePrescaler,
}
/// Clocks configuration
pub struct Config {
// base clock sources
pub msi: Option<MSIRange>,
pub hsi: bool,
pub hse: Option<Hse>,
#[cfg(crs)]
pub hsi48: Option<super::Hsi48Config>,
// pll
pub pll: Option<Pll>,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
pub pllsai1: Option<Pll>,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
pub pllsai2: Option<Pll>,
// sysclk, buses.
pub sys: Sysclk,
pub ahb_pre: AHBPrescaler,
pub apb1_pre: APBPrescaler,
#[cfg(not(stm32u0))]
pub apb2_pre: APBPrescaler,
#[cfg(any(stm32wl5x, stm32wb))]
pub core2_ahb_pre: AHBPrescaler,
#[cfg(any(stm32wl, stm32wb))]
pub shared_ahb_pre: AHBPrescaler,
// low speed LSI/LSE/RTC
pub ls: super::LsConfig,
#[cfg(any(stm32l0, stm32l1))]
pub voltage_scale: VoltageScale,
/// Per-peripheral kernel clock selection muxes
pub mux: super::mux::ClockMux,
}
impl Default for Config {
#[inline]
fn default() -> Config {
Config {
hse: None,
hsi: false,
msi: Some(MSIRange::RANGE4M),
sys: Sysclk::MSI,
ahb_pre: AHBPrescaler::DIV1,
apb1_pre: APBPrescaler::DIV1,
#[cfg(not(stm32u0))]
apb2_pre: APBPrescaler::DIV1,
#[cfg(any(stm32wl5x, stm32wb))]
core2_ahb_pre: AHBPrescaler::DIV1,
#[cfg(any(stm32wl, stm32wb))]
shared_ahb_pre: AHBPrescaler::DIV1,
pll: None,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
pllsai1: None,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
pllsai2: None,
#[cfg(crs)]
hsi48: Some(Default::default()),
ls: Default::default(),
#[cfg(any(stm32l0, stm32l1))]
voltage_scale: VoltageScale::RANGE1,
mux: Default::default(),
}
}
}
#[cfg(stm32wb)]
pub const WPAN_DEFAULT: Config = Config {
hse: Some(Hse {
freq: Hertz(32_000_000),
mode: HseMode::Oscillator,
prescaler: HsePrescaler::DIV1,
}),
sys: Sysclk::PLL1_R,
#[cfg(crs)]
hsi48: Some(super::Hsi48Config { sync_from_usb: false }),
msi: None,
hsi: false,
ls: super::LsConfig::default_lse(),
pll: Some(Pll {
source: PllSource::HSE,
prediv: PllPreDiv::DIV2,
mul: PllMul::MUL12,
divp: Some(PllPDiv::DIV3), // 32 / 2 * 12 / 3 = 64Mhz
divq: Some(PllQDiv::DIV4), // 32 / 2 * 12 / 4 = 48Mhz
divr: Some(PllRDiv::DIV3), // 32 / 2 * 12 / 3 = 64Mhz
}),
pllsai1: None,
ahb_pre: AHBPrescaler::DIV1,
core2_ahb_pre: AHBPrescaler::DIV2,
shared_ahb_pre: AHBPrescaler::DIV1,
apb1_pre: APBPrescaler::DIV1,
apb2_pre: APBPrescaler::DIV1,
mux: super::mux::ClockMux::default(),
};
fn msi_enable(range: MSIRange) {
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl, stm32u0))]
RCC.cr().modify(|w| {
#[cfg(not(stm32wb))]
w.set_msirgsel(crate::pac::rcc::vals::Msirgsel::CR);
w.set_msirange(range);
w.set_msipllen(false);
});
#[cfg(any(stm32l0, stm32l1))]
RCC.icscr().modify(|w| w.set_msirange(range));
RCC.cr().modify(|w| w.set_msion(true));
while !RCC.cr().read().msirdy() {}
}
pub(crate) unsafe fn init(config: Config) {
// Switch to MSI to prevent problems with PLL configuration.
if !RCC.cr().read().msion() {
// Turn on MSI and configure it to 4MHz.
msi_enable(MSIRange::RANGE4M)
}
if RCC.cfgr().read().sws() != Sysclk::MSI {
// Set MSI as a clock source, reset prescalers.
RCC.cfgr().write_value(Cfgr::default());
// Wait for clock switch status bits to change.
while RCC.cfgr().read().sws() != Sysclk::MSI {}
}
#[cfg(stm32wl)]
{
// Set max latency
FLASH.acr().modify(|w| w.set_prften(true));
FLASH.acr().modify(|w| w.set_latency(2));
}
// Set voltage scale
#[cfg(any(stm32l0, stm32l1))]
{
while crate::pac::PWR.csr().read().vosf() {}
crate::pac::PWR.cr().write(|w| w.set_vos(config.voltage_scale));
while crate::pac::PWR.csr().read().vosf() {}
}
#[cfg(stm32l5)]
crate::pac::PWR.cr1().modify(|w| {
w.set_vos(crate::pac::pwr::vals::Vos::RANGE0);
});
let rtc = config.ls.init();
let msi = config.msi.map(|range| {
msi_enable(range);
msirange_to_hertz(range)
});
// If LSE is enabled and the right freq, enable calibration of MSI
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl))]
if config.ls.lse.map(|x| x.frequency) == Some(Hertz(32_768)) {
RCC.cr().modify(|w| w.set_msipllen(true));
}
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| {
#[cfg(stm32wl)]
w.set_hsebyppwr(hse.mode == HseMode::Bypass);
#[cfg(not(stm32wl))]
w.set_hsebyp(hse.mode == HseMode::Bypass);
w.set_hseon(true);
});
while !RCC.cr().read().hserdy() {}
hse.freq
});
#[cfg(crs)]
let hsi48 = config.hsi48.map(|config| super::init_hsi48(config));
#[cfg(not(crs))]
let hsi48: Option<Hertz> = None;
let _plls = [
&config.pll,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
&config.pllsai1,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
&config.pllsai2,
];
// L4 has shared PLLSRC, PLLM, check it's equal in all PLLs.
#[cfg(all(stm32l4, not(rcc_l4plus)))]
match super::util::get_equal(_plls.into_iter().flatten().map(|p| (p.source, p.prediv))) {
Err(()) => panic!("Source must be equal across all enabled PLLs."),
Ok(None) => {}
Ok(Some((source, prediv))) => RCC.pllcfgr().write(|w| {
w.set_pllm(prediv);
w.set_pllsrc(source);
}),
};
// L4+, WL has shared PLLSRC, check it's equal in all PLLs.
#[cfg(any(rcc_l4plus, stm32wl))]
match super::util::get_equal(_plls.into_iter().flatten().map(|p| p.source)) {
Err(()) => panic!("Source must be equal across all enabled PLLs."),
Ok(None) => {}
Ok(Some(source)) => RCC.pllcfgr().write(|w| {
w.set_pllsrc(source);
}),
};
let pll_input = PllInput {
hse,
hsi,
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl, stm32u0))]
msi,
};
let pll = init_pll(PllInstance::Pll, config.pll, &pll_input);
#[cfg(any(stm32l4, stm32l5, stm32wb))]
let pllsai1 = init_pll(PllInstance::Pllsai1, config.pllsai1, &pll_input);
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
let pllsai2 = init_pll(PllInstance::Pllsai2, config.pllsai2, &pll_input);
let sys_clk = match config.sys {
Sysclk::HSE => hse.unwrap(),
Sysclk::HSI => hsi.unwrap(),
Sysclk::MSI => msi.unwrap(),
Sysclk::PLL1_R => pll.r.unwrap(),
#[cfg(stm32u0)]
Sysclk::LSI | Sysclk::LSE => todo!(),
#[cfg(stm32u0)]
Sysclk::_RESERVED_6 | Sysclk::_RESERVED_7 => unreachable!(),
};
#[cfg(rcc_l4plus)]
assert!(sys_clk.0 <= 120_000_000);
#[cfg(all(stm32l4, not(rcc_l4plus)))]
assert!(sys_clk.0 <= 80_000_000);
let hclk1 = sys_clk / config.ahb_pre;
let (pclk1, pclk1_tim) = super::util::calc_pclk(hclk1, config.apb1_pre);
#[cfg(not(stm32u0))]
let (pclk2, pclk2_tim) = super::util::calc_pclk(hclk1, config.apb2_pre);
#[cfg(any(stm32l4, stm32l5, stm32wlex))]
let hclk2 = hclk1;
#[cfg(any(stm32wl5x, stm32wb))]
let hclk2 = sys_clk / config.core2_ahb_pre;
#[cfg(any(stm32l4, stm32l5, stm32wlex))]
let hclk3 = hclk1;
#[cfg(any(stm32wl5x, stm32wb))]
let hclk3 = sys_clk / config.shared_ahb_pre;
// Set flash wait states
#[cfg(any(stm32l0, stm32l1))]
let latency = match (config.voltage_scale, sys_clk.0) {
(VoltageScale::RANGE1, ..=16_000_000) => false,
(VoltageScale::RANGE2, ..=8_000_000) => false,
(VoltageScale::RANGE3, ..=4_200_000) => false,
_ => true,
};
#[cfg(stm32l4)]
let latency = match hclk1.0 {
0..=16_000_000 => 0,
0..=32_000_000 => 1,
0..=48_000_000 => 2,
0..=64_000_000 => 3,
_ => 4,
};
#[cfg(stm32l5)]
let latency = match hclk1.0 {
// VCORE Range 0 (performance), others TODO
0..=20_000_000 => 0,
0..=40_000_000 => 1,
0..=60_000_000 => 2,
0..=80_000_000 => 3,
0..=100_000_000 => 4,
_ => 5,
};
#[cfg(stm32wl)]
let latency = match hclk3.0 {
// VOS RANGE1, others TODO.
..=18_000_000 => 0,
..=36_000_000 => 1,
_ => 2,
};
#[cfg(stm32wb)]
let latency = match hclk3.0 {
// VOS RANGE1, others TODO.
..=18_000_000 => 0,
..=36_000_000 => 1,
..=54_000_000 => 2,
..=64_000_000 => 3,
_ => 4,
};
#[cfg(stm32u0)]
let latency = match hclk1.0 {
// VOS RANGE1, others TODO.
..=24_000_000 => 0,
..=48_000_000 => 1,
_ => 2,
};
#[cfg(stm32l1)]
FLASH.acr().write(|w| w.set_acc64(true));
#[cfg(not(stm32l5))]
FLASH.acr().modify(|w| w.set_prften(true));
FLASH.acr().modify(|w| w.set_latency(latency));
while FLASH.acr().read().latency() != latency {}
RCC.cfgr().modify(|w| {
w.set_sw(config.sys);
w.set_hpre(config.ahb_pre);
#[cfg(stm32u0)]
w.set_ppre(config.apb1_pre);
#[cfg(not(stm32u0))]
w.set_ppre1(config.apb1_pre);
#[cfg(not(stm32u0))]
w.set_ppre2(config.apb2_pre);
});
while RCC.cfgr().read().sws() != config.sys {}
#[cfg(any(stm32wl, stm32wb))]
{
RCC.extcfgr().modify(|w| {
w.set_shdhpre(config.shared_ahb_pre);
#[cfg(any(stm32wl5x, stm32wb))]
w.set_c2hpre(config.core2_ahb_pre);
});
while !RCC.extcfgr().read().shdhpref() {}
#[cfg(any(stm32wl5x, stm32wb))]
while !RCC.extcfgr().read().c2hpref() {}
}
config.mux.init();
set_clocks!(
sys: Some(sys_clk),
hclk1: Some(hclk1),
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl))]
hclk2: Some(hclk2),
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl))]
hclk3: Some(hclk3),
pclk1: Some(pclk1),
#[cfg(not(stm32u0))]
pclk2: Some(pclk2),
pclk1_tim: Some(pclk1_tim),
#[cfg(not(stm32u0))]
pclk2_tim: Some(pclk2_tim),
#[cfg(stm32wl)]
pclk3: Some(hclk3),
hsi: hsi,
hse: hse,
msi: msi,
hsi48: hsi48,
#[cfg(any(stm32l0, stm32l1))]
pll1_vco_div_2: pll.vco.map(|c| c/2u32),
#[cfg(not(any(stm32l0, stm32l1)))]
pll1_p: pll.p,
#[cfg(not(any(stm32l0, stm32l1)))]
pll1_q: pll.q,
pll1_r: pll.r,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
pllsai1_p: pllsai1.p,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
pllsai1_q: pllsai1.q,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
pllsai1_r: pllsai1.r,
#[cfg(not(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5)))]
pllsai2_p: None,
#[cfg(not(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5)))]
pllsai2_q: None,
#[cfg(not(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5)))]
pllsai2_r: None,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
pllsai2_p: pllsai2.p,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
pllsai2_q: pllsai2.q,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
pllsai2_r: pllsai2.r,
#[cfg(dsihost)]
dsi_phy: None, // DSI PLL clock not supported, don't call `RccPeripheral::frequency()` in the drivers
rtc: rtc,
// TODO
sai1_extclk: None,
sai2_extclk: None,
lsi: None,
lse: None,
);
}
#[cfg(any(stm32l0, stm32l1))]
fn msirange_to_hertz(range: MSIRange) -> Hertz {
Hertz(32_768 * (1 << (range as u8 + 1)))
}
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl, stm32u0))]
fn msirange_to_hertz(range: MSIRange) -> Hertz {
match range {
MSIRange::RANGE100K => Hertz(100_000),
MSIRange::RANGE200K => Hertz(200_000),
MSIRange::RANGE400K => Hertz(400_000),
MSIRange::RANGE800K => Hertz(800_000),
MSIRange::RANGE1M => Hertz(1_000_000),
MSIRange::RANGE2M => Hertz(2_000_000),
MSIRange::RANGE4M => Hertz(4_000_000),
MSIRange::RANGE8M => Hertz(8_000_000),
MSIRange::RANGE16M => Hertz(16_000_000),
MSIRange::RANGE24M => Hertz(24_000_000),
MSIRange::RANGE32M => Hertz(32_000_000),
MSIRange::RANGE48M => Hertz(48_000_000),
_ => unreachable!(),
}
}
#[derive(PartialEq, Eq, Clone, Copy)]
enum PllInstance {
Pll,
#[cfg(any(stm32l4, stm32l5, stm32wb))]
Pllsai1,
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
Pllsai2,
}
fn pll_enable(instance: PllInstance, enabled: bool) {
match instance {
PllInstance::Pll => {
RCC.cr().modify(|w| w.set_pllon(enabled));
while RCC.cr().read().pllrdy() != enabled {}
}
#[cfg(any(stm32l4, stm32l5, stm32wb))]
PllInstance::Pllsai1 => {
RCC.cr().modify(|w| w.set_pllsai1on(enabled));
while RCC.cr().read().pllsai1rdy() != enabled {}
}
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
PllInstance::Pllsai2 => {
RCC.cr().modify(|w| w.set_pllsai2on(enabled));
while RCC.cr().read().pllsai2rdy() != enabled {}
}
}
}
pub use pll::*;
#[cfg(any(stm32l0, stm32l1))]
mod pll {
use super::{pll_enable, PllInstance};
pub use crate::pac::rcc::vals::{Plldiv as PllDiv, Pllmul as PllMul, Pllsrc as PllSource};
use crate::pac::RCC;
use crate::time::Hertz;
#[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,
}
pub(super) struct PllInput {
pub hsi: Option<Hertz>,
pub hse: Option<Hertz>,
}
#[allow(unused)]
#[derive(Default)]
pub(super) struct PllOutput {
pub r: Option<Hertz>,
pub vco: Option<Hertz>,
}
pub(super) fn init_pll(instance: PllInstance, config: Option<Pll>, input: &PllInput) -> PllOutput {
// Disable PLL
pll_enable(instance, false);
let Some(pll) = config else { return PllOutput::default() };
let pll_src = match pll.source {
PllSource::HSE => unwrap!(input.hse),
PllSource::HSI => unwrap!(input.hsi),
};
let vco_freq = pll_src * pll.mul;
let r = vco_freq / pll.div;
assert!(r <= 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
pll_enable(instance, true);
PllOutput {
r: Some(r),
vco: Some(vco_freq),
}
}
}
#[cfg(any(stm32l4, stm32l5, stm32wb, stm32wl, stm32u0))]
mod pll {
use super::{pll_enable, PllInstance};
pub use crate::pac::rcc::vals::{
Pllm as PllPreDiv, Plln as PllMul, Pllp as PllPDiv, Pllq as PllQDiv, Pllr as PllRDiv, Pllsrc as PllSource,
};
use crate::pac::RCC;
use crate::time::Hertz;
#[derive(Clone, Copy)]
pub struct Pll {
/// PLL source
pub source: PllSource,
/// PLL pre-divider (DIVM).
pub prediv: PllPreDiv,
/// PLL multiplication factor.
pub mul: PllMul,
/// PLL P division factor. If None, PLL P output is disabled.
pub divp: Option<PllPDiv>,
/// PLL Q division factor. If None, PLL Q output is disabled.
pub divq: Option<PllQDiv>,
/// PLL R division factor. If None, PLL R output is disabled.
pub divr: Option<PllRDiv>,
}
pub(super) struct PllInput {
pub hsi: Option<Hertz>,
pub hse: Option<Hertz>,
pub msi: Option<Hertz>,
}
#[allow(unused)]
#[derive(Default)]
pub(super) struct PllOutput {
pub p: Option<Hertz>,
pub q: Option<Hertz>,
pub r: Option<Hertz>,
}
pub(super) fn init_pll(instance: PllInstance, config: Option<Pll>, input: &PllInput) -> PllOutput {
// Disable PLL
pll_enable(instance, false);
let Some(pll) = config else { return PllOutput::default() };
let pll_src = match pll.source {
PllSource::DISABLE => panic!("must not select PLL source as DISABLE"),
PllSource::HSE => unwrap!(input.hse),
PllSource::HSI => unwrap!(input.hsi),
PllSource::MSI => unwrap!(input.msi),
};
let vco_freq = pll_src / pll.prediv * pll.mul;
let p = pll.divp.map(|div| vco_freq / div);
let q = pll.divq.map(|div| vco_freq / div);
let r = pll.divr.map(|div| vco_freq / div);
#[cfg(stm32l5)]
if instance == PllInstance::Pllsai2 {
assert!(q.is_none(), "PLLSAI2_Q is not available on L5");
assert!(r.is_none(), "PLLSAI2_R is not available on L5");
}
macro_rules! write_fields {
($w:ident) => {
$w.set_plln(pll.mul);
if let Some(divp) = pll.divp {
$w.set_pllp(divp);
$w.set_pllpen(true);
}
if let Some(divq) = pll.divq {
$w.set_pllq(divq);
$w.set_pllqen(true);
}
if let Some(divr) = pll.divr {
$w.set_pllr(divr);
$w.set_pllren(true);
}
};
}
match instance {
PllInstance::Pll => RCC.pllcfgr().write(|w| {
w.set_pllm(pll.prediv);
w.set_pllsrc(pll.source);
write_fields!(w);
}),
#[cfg(any(stm32l4, stm32l5, stm32wb))]
PllInstance::Pllsai1 => RCC.pllsai1cfgr().write(|w| {
#[cfg(any(rcc_l4plus, stm32l5))]
w.set_pllm(pll.prediv);
#[cfg(stm32l5)]
w.set_pllsrc(pll.source);
write_fields!(w);
}),
#[cfg(any(stm32l47x, stm32l48x, stm32l49x, stm32l4ax, rcc_l4plus, stm32l5))]
PllInstance::Pllsai2 => RCC.pllsai2cfgr().write(|w| {
#[cfg(any(rcc_l4plus, stm32l5))]
w.set_pllm(pll.prediv);
#[cfg(stm32l5)]
w.set_pllsrc(pll.source);
write_fields!(w);
}),
}
// Enable PLL
pll_enable(instance, true);
PllOutput { p, q, r }
}
}