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stm32: add low power for g4

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This commit is contained in:
xoviat 2023-11-08 19:04:20 -06:00
parent 3bccb67231
commit 4b4c28d875
5 changed files with 171 additions and 141 deletions
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2
embassy-stm32/Cargo.toml
View file

@ -18,7 +18,7 @@ flavors = [
{ regex_feature = "stm32f7.*", target = "thumbv7em-none-eabi" },
{ regex_feature = "stm32c0.*", target = "thumbv6m-none-eabi" },
{ regex_feature = "stm32g0.*", target = "thumbv6m-none-eabi" },
{ regex_feature = "stm32g4.*", target = "thumbv7em-none-eabi" },
{ regex_feature = "stm32g4.*", target = "thumbv7em-none-eabi", features = ["low-power"] },
{ regex_feature = "stm32h5.*", target = "thumbv8m.main-none-eabihf" },
{ regex_feature = "stm32h7.*", target = "thumbv7em-none-eabi" },
{ regex_feature = "stm32l0.*", target = "thumbv6m-none-eabi", features = ["low-power"] },

162
embassy-stm32/src/rtc/mod.rs
View file

@ -33,6 +33,60 @@ use embassy_hal_internal::Peripheral;
use crate::peripherals::RTC;
use crate::rtc::sealed::Instance;
#[repr(u8)]
#[derive(Clone, Copy, Debug)]
pub(crate) enum WakeupPrescaler {
Div2 = 2,
Div4 = 4,
Div8 = 8,
Div16 = 16,
}
#[cfg(any(stm32wb, stm32f4, stm32l0, stm32g4))]
impl From<WakeupPrescaler> for crate::pac::rtc::vals::Wucksel {
fn from(val: WakeupPrescaler) -> Self {
use crate::pac::rtc::vals::Wucksel;
match val {
WakeupPrescaler::Div2 => Wucksel::DIV2,
WakeupPrescaler::Div4 => Wucksel::DIV4,
WakeupPrescaler::Div8 => Wucksel::DIV8,
WakeupPrescaler::Div16 => Wucksel::DIV16,
}
}
}
#[cfg(any(stm32wb, stm32f4, stm32l0, stm32g4))]
impl From<crate::pac::rtc::vals::Wucksel> for WakeupPrescaler {
fn from(val: crate::pac::rtc::vals::Wucksel) -> Self {
use crate::pac::rtc::vals::Wucksel;
match val {
Wucksel::DIV2 => WakeupPrescaler::Div2,
Wucksel::DIV4 => WakeupPrescaler::Div4,
Wucksel::DIV8 => WakeupPrescaler::Div8,
Wucksel::DIV16 => WakeupPrescaler::Div16,
_ => unreachable!(),
}
}
}
#[cfg(feature = "low-power")]
impl WakeupPrescaler {
pub fn compute_min(val: u32) -> Self {
*[
WakeupPrescaler::Div2,
WakeupPrescaler::Div4,
WakeupPrescaler::Div8,
WakeupPrescaler::Div16,
]
.iter()
.skip_while(|psc| **psc as u32 <= val)
.next()
.unwrap_or(&WakeupPrescaler::Div16)
}
}
/// Errors that can occur on methods on [RtcClock]
#[non_exhaustive]
#[derive(Clone, Debug, PartialEq, Eq)]
@ -277,6 +331,114 @@ impl Rtc {
pub fn write_backup_register(&self, register: usize, value: u32) {
RTC::write_backup_register(&RTC::regs(), register, value)
}
#[cfg(feature = "low-power")]
/// start the wakeup alarm and wtih a duration that is as close to but less than
/// the requested duration, and record the instant the wakeup alarm was started
pub(crate) fn start_wakeup_alarm(
&self,
requested_duration: embassy_time::Duration,
cs: critical_section::CriticalSection,
) {
use embassy_time::{Duration, TICK_HZ};
#[cfg(any(rtc_v3, rtc_v3u5))]
use crate::pac::rtc::vals::Calrf;
// Panic if the rcc mod knows we're not using low-power rtc
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
unsafe { crate::rcc::get_freqs() }.rtc.unwrap();
let requested_duration = requested_duration.as_ticks().clamp(0, u32::MAX as u64);
let rtc_hz = Self::frequency().0 as u64;
let rtc_ticks = requested_duration * rtc_hz / TICK_HZ;
let prescaler = WakeupPrescaler::compute_min((rtc_ticks / u16::MAX as u64) as u32);
// adjust the rtc ticks to the prescaler and subtract one rtc tick
let rtc_ticks = rtc_ticks / prescaler as u64;
let rtc_ticks = rtc_ticks.clamp(0, (u16::MAX - 1) as u64).saturating_sub(1) as u16;
self.write(false, |regs| {
regs.cr().modify(|w| w.set_wute(false));
#[cfg(any(
rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb
))]
{
regs.isr().modify(|w| w.set_wutf(false));
while !regs.isr().read().wutwf() {}
}
#[cfg(any(rtc_v3, rtc_v3u5))]
{
regs.scr().write(|w| w.set_cwutf(Calrf::CLEAR));
while !regs.icsr().read().wutwf() {}
}
regs.cr().modify(|w| w.set_wucksel(prescaler.into()));
regs.wutr().write(|w| w.set_wut(rtc_ticks));
regs.cr().modify(|w| w.set_wute(true));
regs.cr().modify(|w| w.set_wutie(true));
});
let instant = self.instant().unwrap();
trace!(
"rtc: start wakeup alarm for {} ms (psc: {}, ticks: {}) at {}",
Duration::from_ticks(rtc_ticks as u64 * TICK_HZ * prescaler as u64 / rtc_hz).as_millis(),
prescaler as u32,
rtc_ticks,
instant,
);
assert!(self.stop_time.borrow(cs).replace(Some(instant)).is_none())
}
#[cfg(feature = "low-power")]
/// stop the wakeup alarm and return the time elapsed since `start_wakeup_alarm`
/// was called, otherwise none
pub(crate) fn stop_wakeup_alarm(&self, cs: critical_section::CriticalSection) -> Option<embassy_time::Duration> {
use crate::interrupt::typelevel::Interrupt;
#[cfg(any(rtc_v3, rtc_v3u5))]
use crate::pac::rtc::vals::Calrf;
let instant = self.instant().unwrap();
if RTC::regs().cr().read().wute() {
trace!("rtc: stop wakeup alarm at {}", instant);
self.write(false, |regs| {
regs.cr().modify(|w| w.set_wutie(false));
regs.cr().modify(|w| w.set_wute(false));
#[cfg(any(
rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb
))]
regs.isr().modify(|w| w.set_wutf(false));
#[cfg(any(rtc_v3, rtc_v3u5))]
regs.scr().write(|w| w.set_cwutf(Calrf::CLEAR));
crate::pac::EXTI
.pr(0)
.modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
<RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::unpend();
});
}
self.stop_time.borrow(cs).take().map(|stop_time| instant - stop_time)
}
#[cfg(feature = "low-power")]
pub(crate) fn enable_wakeup_line(&self) {
use crate::interrupt::typelevel::Interrupt;
use crate::pac::EXTI;
<RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::unpend();
unsafe { <RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::enable() };
EXTI.rtsr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
EXTI.imr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
}
}
pub(crate) fn byte_to_bcd2(byte: u8) -> (u8, u8) {

138
embassy-stm32/src/rtc/v2.rs
View file

@ -6,145 +6,7 @@ use crate::peripherals::RTC;
use crate::rtc::sealed::Instance;
#[allow(dead_code)]
#[repr(u8)]
#[derive(Clone, Copy, Debug)]
pub(crate) enum WakeupPrescaler {
Div2 = 2,
Div4 = 4,
Div8 = 8,
Div16 = 16,
}
#[cfg(any(stm32wb, stm32f4, stm32l0))]
impl From<WakeupPrescaler> for crate::pac::rtc::vals::Wucksel {
fn from(val: WakeupPrescaler) -> Self {
use crate::pac::rtc::vals::Wucksel;
match val {
WakeupPrescaler::Div2 => Wucksel::DIV2,
WakeupPrescaler::Div4 => Wucksel::DIV4,
WakeupPrescaler::Div8 => Wucksel::DIV8,
WakeupPrescaler::Div16 => Wucksel::DIV16,
}
}
}
#[cfg(any(stm32wb, stm32f4, stm32l0))]
impl From<crate::pac::rtc::vals::Wucksel> for WakeupPrescaler {
fn from(val: crate::pac::rtc::vals::Wucksel) -> Self {
use crate::pac::rtc::vals::Wucksel;
match val {
Wucksel::DIV2 => WakeupPrescaler::Div2,
Wucksel::DIV4 => WakeupPrescaler::Div4,
Wucksel::DIV8 => WakeupPrescaler::Div8,
Wucksel::DIV16 => WakeupPrescaler::Div16,
_ => unreachable!(),
}
}
}
#[allow(dead_code)]
impl WakeupPrescaler {
pub fn compute_min(val: u32) -> Self {
*[
WakeupPrescaler::Div2,
WakeupPrescaler::Div4,
WakeupPrescaler::Div8,
WakeupPrescaler::Div16,
]
.iter()
.skip_while(|psc| **psc as u32 <= val)
.next()
.unwrap_or(&WakeupPrescaler::Div16)
}
}
impl super::Rtc {
#[cfg(feature = "low-power")]
/// start the wakeup alarm and wtih a duration that is as close to but less than
/// the requested duration, and record the instant the wakeup alarm was started
pub(crate) fn start_wakeup_alarm(
&self,
requested_duration: embassy_time::Duration,
cs: critical_section::CriticalSection,
) {
use embassy_time::{Duration, TICK_HZ};
// Panic if the rcc mod knows we're not using low-power rtc
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
unsafe { crate::rcc::get_freqs() }.rtc.unwrap();
let requested_duration = requested_duration.as_ticks().clamp(0, u32::MAX as u64);
let rtc_hz = Self::frequency().0 as u64;
let rtc_ticks = requested_duration * rtc_hz / TICK_HZ;
let prescaler = WakeupPrescaler::compute_min((rtc_ticks / u16::MAX as u64) as u32);
// adjust the rtc ticks to the prescaler and subtract one rtc tick
let rtc_ticks = rtc_ticks / prescaler as u64;
let rtc_ticks = rtc_ticks.clamp(0, (u16::MAX - 1) as u64).saturating_sub(1) as u16;
self.write(false, |regs| {
regs.cr().modify(|w| w.set_wute(false));
regs.isr().modify(|w| w.set_wutf(false));
while !regs.isr().read().wutwf() {}
regs.cr().modify(|w| w.set_wucksel(prescaler.into()));
regs.wutr().write(|w| w.set_wut(rtc_ticks));
regs.cr().modify(|w| w.set_wute(true));
regs.cr().modify(|w| w.set_wutie(true));
});
let instant = self.instant().unwrap();
trace!(
"rtc: start wakeup alarm for {} ms (psc: {}, ticks: {}) at {}",
Duration::from_ticks(rtc_ticks as u64 * TICK_HZ * prescaler as u64 / rtc_hz).as_millis(),
prescaler as u32,
rtc_ticks,
instant,
);
assert!(self.stop_time.borrow(cs).replace(Some(instant)).is_none())
}
#[cfg(feature = "low-power")]
/// stop the wakeup alarm and return the time elapsed since `start_wakeup_alarm`
/// was called, otherwise none
pub(crate) fn stop_wakeup_alarm(&self, cs: critical_section::CriticalSection) -> Option<embassy_time::Duration> {
use crate::interrupt::typelevel::Interrupt;
let instant = self.instant().unwrap();
if RTC::regs().cr().read().wute() {
trace!("rtc: stop wakeup alarm at {}", instant);
self.write(false, |regs| {
regs.cr().modify(|w| w.set_wutie(false));
regs.cr().modify(|w| w.set_wute(false));
regs.isr().modify(|w| w.set_wutf(false));
crate::pac::EXTI
.pr(0)
.modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
<RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::unpend();
});
}
self.stop_time.borrow(cs).take().map(|stop_time| instant - stop_time)
}
#[cfg(feature = "low-power")]
pub(crate) fn enable_wakeup_line(&self) {
use crate::interrupt::typelevel::Interrupt;
use crate::pac::EXTI;
<RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::unpend();
unsafe { <RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::enable() };
EXTI.rtsr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
EXTI.imr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
}
/// Applies the RTC config
/// It this changes the RTC clock source the time will be reset
pub(super) fn configure(&mut self, async_psc: u8, sync_psc: u16) {

8
embassy-stm32/src/rtc/v3.rs
View file

@ -95,7 +95,7 @@ impl super::Rtc {
})
}
pub(super) fn write<F, R>(&mut self, init_mode: bool, f: F) -> R
pub(super) fn write<F, R>(&self, init_mode: bool, f: F) -> R
where
F: FnOnce(&crate::pac::rtc::Rtc) -> R,
{
@ -129,6 +129,12 @@ impl super::Rtc {
impl sealed::Instance for crate::peripherals::RTC {
const BACKUP_REGISTER_COUNT: usize = 32;
#[cfg(all(feature = "low-power", stm32g4))]
const EXTI_WAKEUP_LINE: usize = 20;
#[cfg(all(feature = "low-power", stm32g4))]
type WakeupInterrupt = crate::interrupt::typelevel::RTC_WKUP;
fn read_backup_register(_rtc: &Rtc, register: usize) -> Option<u32> {
#[allow(clippy::if_same_then_else)]
if register < Self::BACKUP_REGISTER_COUNT {

2
tests/stm32/Cargo.toml
View file

@ -10,7 +10,7 @@ stm32f103c8 = ["embassy-stm32/stm32f103c8", "not-gpdma"]
stm32f429zi = ["embassy-stm32/stm32f429zi", "chrono", "eth", "stop", "can", "not-gpdma", "dac-adc-pin", "rng"]
stm32g071rb = ["embassy-stm32/stm32g071rb", "cm0", "not-gpdma", "dac-adc-pin"]
stm32c031c6 = ["embassy-stm32/stm32c031c6", "cm0", "not-gpdma"]
stm32g491re = ["embassy-stm32/stm32g491re", "chrono", "not-gpdma", "rng"]
stm32g491re = ["embassy-stm32/stm32g491re", "chrono", "stop", "not-gpdma", "rng"]
stm32h755zi = ["embassy-stm32/stm32h755zi-cm7", "chrono", "not-gpdma", "eth", "dac-adc-pin", "rng"]
stm32h753zi = ["embassy-stm32/stm32h753zi", "chrono", "not-gpdma", "eth", "rng"]
stm32h7a3zi = ["embassy-stm32/stm32h7a3zi", "not-gpdma", "rng"]