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stm32: rtc/low-power cleanup

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This commit is contained in:
xoviat 2023-09-15 18:41:33 -05:00
parent 5a158b94bd
commit 6da75ea285
5 changed files with 63 additions and 83 deletions
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3
embassy-stm32/src/exti.rs
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@ -39,6 +39,9 @@ fn exticr_regs() -> pac::afio::Afio {
} }
pub unsafe fn on_irq() { pub unsafe fn on_irq() {
#[cfg(feature = "low-power")]
crate::low_power::on_wakeup_irq();
#[cfg(not(any(exti_c0, exti_g0, exti_l5, exti_u5, exti_h5, exti_h50)))] #[cfg(not(any(exti_c0, exti_g0, exti_l5, exti_u5, exti_h5, exti_h50)))]
let bits = EXTI.pr(0).read().0; let bits = EXTI.pr(0).read().0;
#[cfg(any(exti_c0, exti_g0, exti_l5, exti_u5, exti_h5, exti_h50))] #[cfg(any(exti_c0, exti_g0, exti_l5, exti_u5, exti_h5, exti_h50))]

47
embassy-stm32/src/low_power.rs
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@ -5,7 +5,6 @@ use cortex_m::peripheral::SCB;
use embassy_executor::*; use embassy_executor::*;
use crate::interrupt; use crate::interrupt;
use crate::interrupt::typelevel::Interrupt;
use crate::rcc::low_power_ready; use crate::rcc::low_power_ready;
use crate::time_driver::{get_driver, RtcDriver}; use crate::time_driver::{get_driver, RtcDriver};
@ -19,36 +18,20 @@ foreach_interrupt! {
(RTC, rtc, $block:ident, WKUP, $irq:ident) => { (RTC, rtc, $block:ident, WKUP, $irq:ident) => {
#[interrupt] #[interrupt]
unsafe fn $irq() { unsafe fn $irq() {
unsafe { EXECUTOR.as_mut().unwrap() }.on_wakeup_irq(); EXECUTOR.as_mut().unwrap().on_wakeup_irq();
} }
}; };
} }
// pub fn timer_driver_pause_time() { #[allow(dead_code)]
// pause_time(); pub(crate) unsafe fn on_wakeup_irq() {
// } EXECUTOR.as_mut().unwrap().on_wakeup_irq();
}
pub fn stop_with_rtc(rtc: &'static Rtc) { pub fn stop_with_rtc(rtc: &'static Rtc) {
unsafe { EXECUTOR.as_mut().unwrap() }.stop_with_rtc(rtc) unsafe { EXECUTOR.as_mut().unwrap() }.stop_with_rtc(rtc)
} }
// pub fn start_wakeup_alarm(requested_duration: embassy_time::Duration) {
// let rtc_instant = unsafe { EXECUTOR.as_mut().unwrap() }
// .rtc
// .unwrap()
// .start_wakeup_alarm(requested_duration);
//
// unsafe { EXECUTOR.as_mut().unwrap() }.last_stop = Some(rtc_instant);
// }
//
// pub fn set_sleepdeep() {
// unsafe { EXECUTOR.as_mut().unwrap() }.scb.set_sleepdeep();
// }
//
// pub fn stop_wakeup_alarm() -> RtcInstant {
// unsafe { EXECUTOR.as_mut().unwrap() }.rtc.unwrap().stop_wakeup_alarm()
// }
/// Thread mode executor, using WFE/SEV. /// Thread mode executor, using WFE/SEV.
/// ///
/// This is the simplest and most common kind of executor. It runs on /// This is the simplest and most common kind of executor. It runs on
@ -91,27 +74,11 @@ impl Executor {
} }
pub(self) fn stop_with_rtc(&mut self, rtc: &'static Rtc) { pub(self) fn stop_with_rtc(&mut self, rtc: &'static Rtc) {
trace!("low power: stop with rtc configured");
self.time_driver.set_rtc(rtc); self.time_driver.set_rtc(rtc);
#[cfg(not(stm32l0))]
crate::interrupt::typelevel::RTC_WKUP::unpend();
#[cfg(not(stm32l0))]
unsafe {
crate::interrupt::typelevel::RTC_WKUP::enable()
};
#[cfg(stm32l0)]
crate::interrupt::typelevel::RTC::unpend();
#[cfg(stm32l0)]
unsafe {
crate::interrupt::typelevel::RTC::enable()
};
rtc.enable_wakeup_line(); rtc.enable_wakeup_line();
trace!("low power: stop with rtc configured");
} }
fn configure_pwr(&mut self) { fn configure_pwr(&mut self) {

40
embassy-stm32/src/rtc/mod.rs
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@ -124,9 +124,6 @@ impl Default for RtcCalibrationCyclePeriod {
impl Rtc { impl Rtc {
pub fn new(_rtc: impl Peripheral<P = RTC>, rtc_config: RtcConfig) -> Self { pub fn new(_rtc: impl Peripheral<P = RTC>, rtc_config: RtcConfig) -> Self {
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
use crate::rcc::get_freqs;
RTC::enable_peripheral_clk(); RTC::enable_peripheral_clk();
BackupDomain::enable_rtc(); BackupDomain::enable_rtc();
@ -135,20 +132,7 @@ impl Rtc {
stop_time: Mutex::const_new(CriticalSectionRawMutex::new(), Cell::new(None)), stop_time: Mutex::const_new(CriticalSectionRawMutex::new(), Cell::new(None)),
}; };
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))] let frequency = Self::frequency();
let freqs = unsafe { get_freqs() };
// Load the clock frequency from the rcc mod, if supported
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
let frequency = match freqs.rtc {
Some(hertz) => hertz,
None => freqs.rtc_hse.unwrap(),
};
// Assume the default value, if not supported
#[cfg(not(any(rcc_wb, rcc_f4, rcc_f410)))]
let frequency = Hertz(32_768);
let async_psc = ((frequency.0 / rtc_config.frequency.0) - 1) as u8; let async_psc = ((frequency.0 / rtc_config.frequency.0) - 1) as u8;
let sync_psc = (rtc_config.frequency.0 - 1) as u16; let sync_psc = (rtc_config.frequency.0 - 1) as u16;
@ -157,6 +141,22 @@ impl Rtc {
this this
} }
fn frequency() -> Hertz {
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
let freqs = unsafe { crate::rcc::get_freqs() };
// Load the clock frequency from the rcc mod, if supported
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
match freqs.rtc {
Some(hertz) => hertz,
None => freqs.rtc_hse.unwrap(),
}
// Assume the default value, if not supported
#[cfg(not(any(rcc_wb, rcc_f4, rcc_f410)))]
Hertz(32_768)
}
/// Set the datetime to a new value. /// Set the datetime to a new value.
/// ///
/// # Errors /// # Errors
@ -264,6 +264,12 @@ pub(crate) mod sealed {
pub trait Instance { pub trait Instance {
const BACKUP_REGISTER_COUNT: usize; const BACKUP_REGISTER_COUNT: usize;
#[cfg(feature = "low-power")]
const EXTI_WAKEUP_LINE: usize;
#[cfg(feature = "low-power")]
type WakeupInterrupt: crate::interrupt::typelevel::Interrupt;
fn regs() -> Rtc { fn regs() -> Rtc {
crate::pac::RTC crate::pac::RTC
} }

50
embassy-stm32/src/rtc/v2.rs
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@ -67,15 +67,10 @@ impl super::Rtc {
pub(crate) fn start_wakeup_alarm(&self, requested_duration: embassy_time::Duration) { pub(crate) fn start_wakeup_alarm(&self, requested_duration: embassy_time::Duration) {
use embassy_time::{Duration, TICK_HZ}; use embassy_time::{Duration, TICK_HZ};
#[cfg(not(stm32l0))] #[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
use crate::rcc::get_freqs; unsafe { crate::rcc::get_freqs() }.rtc.unwrap();
#[cfg(not(stm32l0))]
let rtc_hz = unsafe { get_freqs() }.rtc.unwrap().0 as u64;
#[cfg(stm32l0)]
let rtc_hz = 32_768u64;
let rtc_hz = Self::frequency().0 as u64;
let rtc_ticks = requested_duration.as_ticks() * rtc_hz / TICK_HZ; let rtc_ticks = requested_duration.as_ticks() * rtc_hz / TICK_HZ;
let prescaler = WakeupPrescaler::compute_min((rtc_ticks / u16::MAX as u64) as u32); let prescaler = WakeupPrescaler::compute_min((rtc_ticks / u16::MAX as u64) as u32);
@ -112,17 +107,14 @@ impl super::Rtc {
#[cfg(feature = "low-power")] #[cfg(feature = "low-power")]
pub(crate) fn enable_wakeup_line(&self) { pub(crate) fn enable_wakeup_line(&self) {
use crate::interrupt::typelevel::Interrupt;
use crate::pac::EXTI; use crate::pac::EXTI;
#[cfg(stm32l0)] <RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::unpend();
EXTI.rtsr(0).modify(|w| w.set_line(20, true)); unsafe { <RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::enable() };
#[cfg(stm32l0)]
EXTI.imr(0).modify(|w| w.set_line(20, true));
#[cfg(not(stm32l0))] EXTI.rtsr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
EXTI.rtsr(0).modify(|w| w.set_line(22, true)); EXTI.imr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
#[cfg(not(stm32l0))]
EXTI.imr(0).modify(|w| w.set_line(22, true));
} }
#[cfg(feature = "low-power")] #[cfg(feature = "low-power")]
@ -138,17 +130,11 @@ impl super::Rtc {
regs.cr().modify(|w| w.set_wute(false)); regs.cr().modify(|w| w.set_wute(false));
regs.isr().modify(|w| w.set_wutf(false)); regs.isr().modify(|w| w.set_wutf(false));
#[cfg(not(stm32l0))] crate::pac::EXTI
crate::pac::EXTI.pr(0).modify(|w| w.set_line(22, true)); .pr(0)
.modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
#[cfg(stm32l0)] <RTC as crate::rtc::sealed::Instance>::WakeupInterrupt::unpend();
crate::pac::EXTI.pr(0).modify(|w| w.set_line(20, true));
#[cfg(not(stm32l0))]
crate::interrupt::typelevel::RTC_WKUP::unpend();
#[cfg(stm32l0)]
crate::interrupt::typelevel::RTC::unpend();
}); });
critical_section::with(|cs| { critical_section::with(|cs| {
@ -280,6 +266,18 @@ impl super::Rtc {
impl sealed::Instance for crate::peripherals::RTC { impl sealed::Instance for crate::peripherals::RTC {
const BACKUP_REGISTER_COUNT: usize = 20; const BACKUP_REGISTER_COUNT: usize = 20;
#[cfg(all(feature = "low-power", stm32f4))]
const EXTI_WAKEUP_LINE: usize = 22;
#[cfg(all(feature = "low-power", stm32l0))]
const EXTI_WAKEUP_LINE: usize = 20;
#[cfg(all(feature = "low-power", stm32f4))]
type WakeupInterrupt = crate::interrupt::typelevel::RTC_WKUP;
#[cfg(all(feature = "low-power", stm32l0))]
type WakeupInterrupt = crate::interrupt::typelevel::RTC;
fn enable_peripheral_clk() { fn enable_peripheral_clk() {
#[cfg(any(rtc_v2l4, rtc_v2wb))] #[cfg(any(rtc_v2l4, rtc_v2wb))]
{ {

6
embassy-stm32/src/time_driver.rs
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@ -372,6 +372,12 @@ impl RtcDriver {
#[cfg(feature = "low-power")] #[cfg(feature = "low-power")]
/// Resume the timer with the given offset /// Resume the timer with the given offset
pub(crate) fn resume_time(&self) { pub(crate) fn resume_time(&self) {
if T::regs_gp16().cr1().read().cen() {
// Time isn't currently stopped
return;
}
self.stop_wakeup_alarm(); self.stop_wakeup_alarm();
T::regs_gp16().cr1().modify(|w| w.set_cen(true)); T::regs_gp16().cr1().modify(|w| w.set_cen(true));