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stm32/rtc: more rtc cleanup

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This commit is contained in:
xoviat 2023-10-25 19:50:30 -05:00
parent 0cc3e18db6
commit 0beb84768e
3 changed files with 173 additions and 120 deletions
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191
embassy-stm32/src/rtc/datetime.rs
View File

@ -4,8 +4,60 @@ use core::convert::From;
#[cfg(feature = "chrono")]
use chrono::{self, Datelike, NaiveDate, Timelike, Weekday};
use super::byte_to_bcd2;
use crate::pac::rtc::Rtc;
#[cfg(any(feature = "defmt", feature = "time"))]
use crate::peripherals::RTC;
#[cfg(any(feature = "defmt", feature = "time"))]
use crate::rtc::sealed::Instance;
/// Represents an instant in time that can be substracted to compute a duration
pub struct RtcInstant {
/// 0..59
pub second: u8,
/// 0..256
pub subsecond: u16,
}
impl RtcInstant {
#[allow(dead_code)]
pub(super) fn from(second: u8, subsecond: u16) -> Result<Self, super::RtcError> {
Ok(Self { second, subsecond })
}
}
#[cfg(feature = "defmt")]
impl defmt::Format for RtcInstant {
fn format(&self, fmt: defmt::Formatter) {
defmt::write!(
fmt,
"{}:{}",
self.second,
RTC::regs().prer().read().prediv_s() - self.subsecond,
)
}
}
#[cfg(feature = "time")]
impl core::ops::Sub for RtcInstant {
type Output = embassy_time::Duration;
fn sub(self, rhs: Self) -> Self::Output {
use embassy_time::{Duration, TICK_HZ};
let second = if self.second < rhs.second {
self.second + 60
} else {
self.second
};
let psc = RTC::regs().prer().read().prediv_s() as u32;
let self_ticks = second as u32 * (psc + 1) + (psc - self.subsecond as u32);
let other_ticks = rhs.second as u32 * (psc + 1) + (psc - rhs.subsecond as u32);
let rtc_ticks = self_ticks - other_ticks;
Duration::from_ticks(((rtc_ticks * TICK_HZ as u32) / (psc + 1)) as u64)
}
}
/// Errors regarding the [`DateTime`] struct.
#[derive(Clone, Debug, PartialEq, Eq)]
@ -32,19 +84,85 @@ pub enum Error {
/// Structure containing date and time information
pub struct DateTime {
/// 0..4095
pub year: u16,
year: u16,
/// 1..12, 1 is January
pub month: u8,
month: u8,
/// 1..28,29,30,31 depending on month
pub day: u8,
day: u8,
///
pub day_of_week: DayOfWeek,
day_of_week: DayOfWeek,
/// 0..23
pub hour: u8,
hour: u8,
/// 0..59
pub minute: u8,
minute: u8,
/// 0..59
pub second: u8,
second: u8,
}
impl DateTime {
pub const fn year(&self) -> u16 {
self.year
}
pub const fn month(&self) -> u8 {
self.month
}
pub const fn day(&self) -> u8 {
self.day
}
pub const fn day_of_week(&self) -> DayOfWeek {
self.day_of_week
}
pub const fn hour(&self) -> u8 {
self.hour
}
pub const fn minute(&self) -> u8 {
self.minute
}
pub const fn second(&self) -> u8 {
self.second
}
pub fn from(
year: u16,
month: u8,
day: u8,
day_of_week: u8,
hour: u8,
minute: u8,
second: u8,
) -> Result<Self, Error> {
let day_of_week = day_of_week_from_u8(day_of_week)?;
if year > 4095 {
Err(Error::InvalidYear)
} else if month < 1 || month > 12 {
Err(Error::InvalidMonth)
} else if day < 1 || day > 31 {
Err(Error::InvalidDay)
} else if hour > 23 {
Err(Error::InvalidHour)
} else if minute > 59 {
Err(Error::InvalidMinute)
} else if second > 59 {
Err(Error::InvalidSecond)
} else {
Ok(Self {
year,
month,
day,
day_of_week,
hour,
minute,
second,
})
}
}
}
#[cfg(feature = "chrono")]
@ -142,58 +260,3 @@ pub(super) fn validate_datetime(dt: &DateTime) -> Result<(), Error> {
Ok(())
}
}
pub(super) fn write_date_time(rtc: &Rtc, t: DateTime) {
let (ht, hu) = byte_to_bcd2(t.hour as u8);
let (mnt, mnu) = byte_to_bcd2(t.minute as u8);
let (st, su) = byte_to_bcd2(t.second as u8);
let (dt, du) = byte_to_bcd2(t.day as u8);
let (mt, mu) = byte_to_bcd2(t.month as u8);
let yr = t.year as u16;
let yr_offset = (yr - 1970_u16) as u8;
let (yt, yu) = byte_to_bcd2(yr_offset);
use crate::pac::rtc::vals::Ampm;
rtc.tr().write(|w| {
w.set_ht(ht);
w.set_hu(hu);
w.set_mnt(mnt);
w.set_mnu(mnu);
w.set_st(st);
w.set_su(su);
w.set_pm(Ampm::AM);
});
rtc.dr().write(|w| {
w.set_dt(dt);
w.set_du(du);
w.set_mt(mt > 0);
w.set_mu(mu);
w.set_yt(yt);
w.set_yu(yu);
w.set_wdu(day_of_week_to_u8(t.day_of_week));
});
}
pub(super) fn datetime(
year: u16,
month: u8,
day: u8,
day_of_week: u8,
hour: u8,
minute: u8,
second: u8,
) -> Result<DateTime, Error> {
let day_of_week = day_of_week_from_u8(day_of_week)?;
Ok(DateTime {
year,
month,
day,
day_of_week,
hour,
minute,
second,
})
}

89
embassy-stm32/src/rtc/mod.rs
View File

@ -9,7 +9,8 @@ use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
#[cfg(feature = "low-power")]
use embassy_sync::blocking_mutex::Mutex;
pub use self::datetime::{DateTime, DayOfWeek, Error as DateTimeError};
pub use self::datetime::{DateTime, DayOfWeek, Error as DateTimeError, RtcInstant};
use crate::rtc::datetime::day_of_week_to_u8;
use crate::time::Hertz;
/// refer to AN4759 to compare features of RTC2 and RTC3
@ -39,48 +40,6 @@ pub enum RtcError {
NotRunning,
}
#[cfg(feature = "low-power")]
/// Represents an instant in time that can be substracted to compute a duration
struct RtcInstant {
second: u8,
subsecond: u16,
}
#[cfg(all(feature = "low-power", feature = "defmt"))]
impl defmt::Format for RtcInstant {
fn format(&self, fmt: defmt::Formatter) {
defmt::write!(
fmt,
"{}:{}",
self.second,
RTC::regs().prer().read().prediv_s() - self.subsecond,
)
}
}
#[cfg(feature = "low-power")]
impl core::ops::Sub for RtcInstant {
type Output = embassy_time::Duration;
fn sub(self, rhs: Self) -> Self::Output {
use embassy_time::{Duration, TICK_HZ};
let second = if self.second < rhs.second {
self.second + 60
} else {
self.second
};
let psc = RTC::regs().prer().read().prediv_s() as u32;
let self_ticks = second as u32 * (psc + 1) + (psc - self.subsecond as u32);
let other_ticks = rhs.second as u32 * (psc + 1) + (psc - rhs.subsecond as u32);
let rtc_ticks = self_ticks - other_ticks;
Duration::from_ticks(((rtc_ticks * TICK_HZ as u32) / (psc + 1)) as u64)
}
}
pub struct RtcTimeProvider {
_private: (),
}
@ -113,7 +72,7 @@ impl RtcTimeProvider {
let month = bcd2_to_byte((dr.mt() as u8, dr.mu()));
let year = bcd2_to_byte((dr.yt(), dr.yu())) as u16 + 1970_u16;
return self::datetime::datetime(year, month, day, weekday, hour, minute, second)
return DateTime::from(year, month, day, weekday, hour, minute, second)
.map_err(RtcError::InvalidDateTime);
}
}
@ -134,7 +93,7 @@ impl RtcTimeProvider {
let month = bcd2_to_byte((dr.mt() as u8, dr.mu()));
let year = bcd2_to_byte((dr.yt(), dr.yu())) as u16 + 1970_u16;
self::datetime::datetime(year, month, day, weekday, hour, minute, second).map_err(RtcError::InvalidDateTime)
DateTime::from(year, month, day, weekday, hour, minute, second).map_err(RtcError::InvalidDateTime)
}
}
}
@ -223,14 +182,46 @@ impl Rtc {
/// Will return `RtcError::InvalidDateTime` if the datetime is not a valid range.
pub fn set_datetime(&mut self, t: DateTime) -> Result<(), RtcError> {
self::datetime::validate_datetime(&t).map_err(RtcError::InvalidDateTime)?;
self.write(true, |rtc| self::datetime::write_date_time(rtc, t));
self.write(true, |rtc| {
let (ht, hu) = byte_to_bcd2(t.hour() as u8);
let (mnt, mnu) = byte_to_bcd2(t.minute() as u8);
let (st, su) = byte_to_bcd2(t.second() as u8);
let (dt, du) = byte_to_bcd2(t.day() as u8);
let (mt, mu) = byte_to_bcd2(t.month() as u8);
let yr = t.year() as u16;
let yr_offset = (yr - 1970_u16) as u8;
let (yt, yu) = byte_to_bcd2(yr_offset);
use crate::pac::rtc::vals::Ampm;
rtc.tr().write(|w| {
w.set_ht(ht);
w.set_hu(hu);
w.set_mnt(mnt);
w.set_mnu(mnu);
w.set_st(st);
w.set_su(su);
w.set_pm(Ampm::AM);
});
rtc.dr().write(|w| {
w.set_dt(dt);
w.set_du(du);
w.set_mt(mt > 0);
w.set_mu(mu);
w.set_yt(yt);
w.set_yu(yu);
w.set_wdu(day_of_week_to_u8(t.day_of_week()));
});
});
Ok(())
}
#[cfg(feature = "low-power")]
#[cfg(not(rtc_v2f2))]
/// Return the current instant.
fn instant(&self) -> RtcInstant {
pub fn instant(&self) -> Result<RtcInstant, RtcError> {
let r = RTC::regs();
let tr = r.tr().read();
let subsecond = r.ssr().read().ss();
@ -239,7 +230,7 @@ impl Rtc {
// Unlock the registers
r.dr().read();
RtcInstant { second, subsecond }
RtcInstant::from(second, subsecond.try_into().unwrap())
}
/// Return the current datetime.

13
embassy-stm32/src/rtc/v2.rs
View File

@ -95,15 +95,16 @@ impl super::Rtc {
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,
self.instant(),
instant,
);
assert!(self.stop_time.borrow(cs).replace(Some(self.instant())).is_none())
assert!(self.stop_time.borrow(cs).replace(Some(instant)).is_none())
}
#[cfg(feature = "low-power")]
@ -112,8 +113,9 @@ impl super::Rtc {
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 {}", self.instant());
trace!("rtc: stop wakeup alarm at {}", instant);
self.write(false, |regs| {
regs.cr().modify(|w| w.set_wutie(false));
@ -128,10 +130,7 @@ impl super::Rtc {
});
}
self.stop_time
.borrow(cs)
.take()
.map(|stop_time| self.instant() - stop_time)
self.stop_time.borrow(cs).take().map(|stop_time| instant - stop_time)
}
#[cfg(feature = "low-power")]