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h7: implement RTC and LSE clock configuration

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This commit is contained in:
Matt Ickstadt
2023-10-03 16:45:05 -05:00
parent 65ed19aae2
commit f01609036f
12 changed files with 231 additions and 51 deletions
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61
embassy-stm32/src/rtc/mod.rs
View File

@ -93,21 +93,50 @@ impl RtcTimeProvider {
///
/// Will return an `RtcError::InvalidDateTime` if the stored value in the system is not a valid [`DayOfWeek`].
pub fn now(&self) -> Result<DateTime, RtcError> {
let r = RTC::regs();
let tr = r.tr().read();
let second = bcd2_to_byte((tr.st(), tr.su()));
let minute = bcd2_to_byte((tr.mnt(), tr.mnu()));
let hour = bcd2_to_byte((tr.ht(), tr.hu()));
// Reading either RTC_SSR or RTC_TR locks the values in the higher-order
// calendar shadow registers until RTC_DR is read.
let dr = r.dr().read();
// For RM0433 we use BYPSHAD=1 to work around errata ES0392 2.19.1
#[cfg(rcc_h7rm0433)]
loop {
let r = RTC::regs();
let ss = r.ssr().read().ss();
let dr = r.dr().read();
let tr = r.tr().read();
let weekday = dr.wdu();
let day = bcd2_to_byte((dr.dt(), dr.du()));
let month = bcd2_to_byte((dr.mt() as u8, dr.mu()));
let year = bcd2_to_byte((dr.yt(), dr.yu())) as u16 + 1970_u16;
// If an RTCCLK edge occurs during read we may see inconsistent values
// so read ssr again and see if it has changed. (see RM0433 Rev 7 46.3.9)
let ss_after = r.ssr().read().ss();
if ss == ss_after {
let second = bcd2_to_byte((tr.st(), tr.su()));
let minute = bcd2_to_byte((tr.mnt(), tr.mnu()));
let hour = bcd2_to_byte((tr.ht(), tr.hu()));
self::datetime::datetime(year, month, day, weekday, hour, minute, second).map_err(RtcError::InvalidDateTime)
let weekday = dr.wdu();
let day = bcd2_to_byte((dr.dt(), dr.du()));
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)
.map_err(RtcError::InvalidDateTime);
}
}
#[cfg(not(rcc_h7rm0433))]
{
let r = RTC::regs();
let tr = r.tr().read();
let second = bcd2_to_byte((tr.st(), tr.su()));
let minute = bcd2_to_byte((tr.mnt(), tr.mnu()));
let hour = bcd2_to_byte((tr.ht(), tr.hu()));
// Reading either RTC_SSR or RTC_TR locks the values in the higher-order
// calendar shadow registers until RTC_DR is read.
let dr = r.dr().read();
let weekday = dr.wdu();
let day = bcd2_to_byte((dr.dt(), dr.du()));
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)
}
}
}
@ -175,18 +204,18 @@ impl Rtc {
}
fn frequency() -> Hertz {
#[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
#[cfg(any(rcc_wb, rcc_f4, rcc_f410, rcc_h5, rcc_h50, rcc_h7, rcc_h7rm0433, rcc_h7ab))]
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))]
#[cfg(any(rcc_wb, rcc_f4, rcc_f410, rcc_h5, rcc_h50, rcc_h7, rcc_h7rm0433, rcc_h7ab))]
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)))]
#[cfg(not(any(rcc_wb, rcc_f4, rcc_f410, rcc_h5, rcc_h50, rcc_h7, rcc_h7rm0433, rcc_h7ab)))]
Hertz(32_768)
}

2
embassy-stm32/src/rtc/v2.rs
View File

@ -157,6 +157,8 @@ impl super::Rtc {
w.set_fmt(stm32_metapac::rtc::vals::Fmt::TWENTY_FOUR_HOUR);
w.set_osel(Osel::DISABLED);
w.set_pol(Pol::HIGH);
#[cfg(rcc_h7rm0433)]
w.set_bypshad(true);
});
rtc.prer().modify(|w| {