diff --git a/embassy-stm32/src/rcc/bd.rs b/embassy-stm32/src/rcc/bd.rs new file mode 100644 index 00000000..e0973769 --- /dev/null +++ b/embassy-stm32/src/rcc/bd.rs @@ -0,0 +1,168 @@ +#[derive(Copy, Clone, Debug, PartialEq)] +#[repr(u8)] +pub enum RtcClockSource { + /// 00: No clock + NoClock = 0b00, + /// 01: LSE oscillator clock used as RTC clock + LSE = 0b01, + /// 10: LSI oscillator clock used as RTC clock + LSI = 0b10, + /// 11: HSE oscillator clock divided by 32 used as RTC clock + HSE = 0b11, +} + +pub struct BackupDomain {} + +impl BackupDomain { + #[cfg(any( + rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb + ))] + fn unlock_registers() { + #[cfg(any(rtc_v2f2, rtc_v2f3, rtc_v2l1))] + let cr = crate::pac::PWR.cr(); + #[cfg(any(rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l4, rtc_v2wb))] + let cr = crate::pac::PWR.cr1(); + + // TODO: Missing from PAC for l0 and f0? + #[cfg(not(any(rtc_v2f0, rtc_v2l0)))] + { + if !cr.read().dbp() { + cr.modify(|w| w.set_dbp(true)); + while !cr.read().dbp() {} + } + } + } + + #[cfg(any(rtc_v3, rtc_v3u5))] + fn unlock_registers() { + // Unlock the backup domain + #[cfg(not(any(rtc_v3u5, rcc_wl5, rcc_wle)))] + { + if !crate::pac::PWR.cr1().read().dbp() { + crate::pac::PWR.cr1().modify(|w| w.set_dbp(true)); + while !crate::pac::PWR.cr1().read().dbp() {} + } + } + #[cfg(any(rcc_wl5, rcc_wle))] + { + use crate::pac::pwr::vals::Dbp; + + if crate::pac::PWR.cr1().read().dbp() != Dbp::ENABLED { + crate::pac::PWR.cr1().modify(|w| w.set_dbp(Dbp::ENABLED)); + while crate::pac::PWR.cr1().read().dbp() != Dbp::ENABLED {} + } + } + } + + #[cfg(any( + rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb + ))] + pub fn set_rtc_clock_source(clock_source: RtcClockSource) { + #[cfg(not(rtc_v2wb))] + use stm32_metapac::rcc::vals::Rtcsel; + + #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] + let cr = crate::pac::RCC.bdcr(); + #[cfg(any(rtc_v2l0, rtc_v2l1))] + let cr = crate::pac::RCC.csr(); + + Self::unlock_registers(); + + cr.modify(|w| { + // Select RTC source + #[cfg(not(rtc_v2wb))] + w.set_rtcsel(Rtcsel::from_bits(clock_source as u8)); + #[cfg(rtc_v2wb)] + w.set_rtcsel(clock_source as u8); + }); + } + + #[cfg(any(rtc_v3, rtc_v3u5))] + pub fn set_rtc_clock_source(clock_source: RtcClockSource) { + let clock_source = clock_source as u8; + #[cfg(not(any(rcc_wl5, rcc_wle)))] + let clock_source = crate::pac::rcc::vals::Rtcsel::from_bits(clock_source); + + Self::unlock_registers(); + + crate::pac::RCC.bdcr().modify(|w| { + // Select RTC source + w.set_rtcsel(clock_source); + }); + } + + #[cfg(any( + rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb + ))] + pub fn enable_rtc() { + #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] + let reg = crate::pac::RCC.bdcr().read(); + #[cfg(any(rtc_v2l0, rtc_v2l1))] + let reg = crate::pac::RCC.csr().read(); + + #[cfg(any(rtc_v2h7, rtc_v2l4, rtc_v2wb))] + assert!(!reg.lsecsson(), "RTC is not compatible with LSE CSS, yet."); + + if !reg.rtcen() { + Self::unlock_registers(); + + #[cfg(not(any(rtc_v2l0, rtc_v2l1, rtc_v2f2)))] + crate::pac::RCC.bdcr().modify(|w| w.set_bdrst(true)); + #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] + let cr = crate::pac::RCC.bdcr(); + #[cfg(any(rtc_v2l0, rtc_v2l1))] + let cr = crate::pac::RCC.csr(); + + cr.modify(|w| { + // Reset + #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] + w.set_bdrst(false); + + w.set_rtcen(true); + w.set_rtcsel(reg.rtcsel()); + + // Restore bcdr + #[cfg(any(rtc_v2l4, rtc_v2wb))] + w.set_lscosel(reg.lscosel()); + #[cfg(any(rtc_v2l4, rtc_v2wb))] + w.set_lscoen(reg.lscoen()); + + w.set_lseon(reg.lseon()); + + #[cfg(any(rtc_v2f0, rtc_v2f7, rtc_v2h7, rtc_v2l4, rtc_v2wb))] + w.set_lsedrv(reg.lsedrv()); + w.set_lsebyp(reg.lsebyp()); + }); + } + } + + #[cfg(any(rtc_v3, rtc_v3u5))] + pub fn enable_rtc() { + let bdcr = crate::pac::RCC.bdcr(); + + let reg = bdcr.read(); + assert!(!reg.lsecsson(), "RTC is not compatible with LSE CSS, yet."); + + if !reg.rtcen() { + Self::unlock_registers(); + + bdcr.modify(|w| w.set_bdrst(true)); + + bdcr.modify(|w| { + // Reset + w.set_bdrst(false); + + w.set_rtcen(true); + w.set_rtcsel(reg.rtcsel()); + + // Restore bcdr + w.set_lscosel(reg.lscosel()); + w.set_lscoen(reg.lscoen()); + + w.set_lseon(reg.lseon()); + w.set_lsedrv(reg.lsedrv()); + w.set_lsebyp(reg.lsebyp()); + }); + } + } +} diff --git a/embassy-stm32/src/rcc/f4.rs b/embassy-stm32/src/rcc/f4.rs index ee9cb289..10d3322a 100644 --- a/embassy-stm32/src/rcc/f4.rs +++ b/embassy-stm32/src/rcc/f4.rs @@ -8,8 +8,8 @@ use crate::gpio::sealed::AFType; use crate::gpio::Speed; use crate::pac::rcc::vals::{Hpre, Ppre, Sw}; use crate::pac::{FLASH, PWR, RCC}; +use crate::rcc::bd::{BackupDomain, RtcClockSource}; use crate::rcc::{set_freqs, Clocks}; -use crate::rtc::{Rtc, RtcClockSource}; use crate::time::Hertz; use crate::{peripherals, Peripheral}; @@ -470,7 +470,7 @@ pub(crate) unsafe fn init(config: Config) { } config.rtc.map(|clock_source| { - Rtc::set_clock_source(clock_source); + BackupDomain::set_rtc_clock_source(clock_source); }); let rtc = match config.rtc { diff --git a/embassy-stm32/src/rcc/l4.rs b/embassy-stm32/src/rcc/l4.rs index 4c4b4bfd..1f02254b 100644 --- a/embassy-stm32/src/rcc/l4.rs +++ b/embassy-stm32/src/rcc/l4.rs @@ -9,8 +9,8 @@ use crate::gpio::sealed::AFType; use crate::gpio::Speed; use crate::pac::rcc::vals::{Hpre, Msirange, Pllsrc, Ppre, Sw}; use crate::pac::{FLASH, PWR, RCC}; +use crate::rcc::bd::{BackupDomain, RtcClockSource as RCS}; use crate::rcc::{set_freqs, Clocks}; -use crate::rtc::{Rtc, RtcClockSource as RCS}; use crate::time::Hertz; use crate::{peripherals, Peripheral}; @@ -429,7 +429,7 @@ pub(crate) unsafe fn init(config: Config) { // Wait until LSE is running while !RCC.bdcr().read().lserdy() {} - Rtc::set_clock_source(RCS::LSE); + BackupDomain::set_rtc_clock_source(RCS::LSE); } RtcClockSource::LSI32 => { // Turn on the internal 32 kHz LSI oscillator @@ -438,7 +438,7 @@ pub(crate) unsafe fn init(config: Config) { // Wait until LSI is running while !RCC.csr().read().lsirdy() {} - Rtc::set_clock_source(RCS::LSI); + BackupDomain::set_rtc_clock_source(RCS::LSI); } } diff --git a/embassy-stm32/src/rcc/mod.rs b/embassy-stm32/src/rcc/mod.rs index f9ac88d9..7b68495b 100644 --- a/embassy-stm32/src/rcc/mod.rs +++ b/embassy-stm32/src/rcc/mod.rs @@ -1,5 +1,6 @@ #![macro_use] +pub(crate) mod bd; pub mod bus; use core::mem::MaybeUninit; diff --git a/embassy-stm32/src/rcc/wb.rs b/embassy-stm32/src/rcc/wb.rs index 653d4d59..6a3eab70 100644 --- a/embassy-stm32/src/rcc/wb.rs +++ b/embassy-stm32/src/rcc/wb.rs @@ -1,6 +1,6 @@ pub use super::bus::{AHBPrescaler, APBPrescaler}; +use crate::rcc::bd::{BackupDomain, RtcClockSource}; use crate::rcc::Clocks; -use crate::rtc::{Rtc, RtcClockSource}; use crate::time::{khz, mhz, Hertz}; /// Most of clock setup is copied from stm32l0xx-hal, and adopted to the generated PAC, @@ -375,5 +375,7 @@ pub(crate) fn configure_clocks(config: &Config) { w.set_shdhpre(config.ahb3_pre.into()); }); - config.rtc.map(|clock_source| Rtc::set_clock_source(clock_source)); + config + .rtc + .map(|clock_source| BackupDomain::set_rtc_clock_source(clock_source)); } diff --git a/embassy-stm32/src/rcc/wl.rs b/embassy-stm32/src/rcc/wl.rs index 29f50dc6..8a9b24c9 100644 --- a/embassy-stm32/src/rcc/wl.rs +++ b/embassy-stm32/src/rcc/wl.rs @@ -1,8 +1,8 @@ pub use super::bus::{AHBPrescaler, APBPrescaler, VoltageScale}; use crate::pac::pwr::vals::Dbp; use crate::pac::{FLASH, PWR, RCC}; +use crate::rcc::bd::{BackupDomain, RtcClockSource as RCS}; use crate::rcc::{set_freqs, Clocks}; -use crate::rtc::{Rtc, RtcClockSource as RCS}; use crate::time::Hertz; /// Most of clock setup is copied from stm32l0xx-hal, and adopted to the generated PAC, @@ -231,7 +231,7 @@ pub(crate) unsafe fn init(config: Config) { // Wait until LSE is running while !RCC.bdcr().read().lserdy() {} - Rtc::set_clock_source(RCS::LSE); + BackupDomain::set_rtc_clock_source(RCS::LSE); } RtcClockSource::LSI32 => { // Turn on the internal 32 kHz LSI oscillator @@ -240,7 +240,7 @@ pub(crate) unsafe fn init(config: Config) { // Wait until LSI is running while !RCC.csr().read().lsirdy() {} - Rtc::set_clock_source(RCS::LSI); + BackupDomain::set_rtc_clock_source(RCS::LSI); } } diff --git a/embassy-stm32/src/rtc/mod.rs b/embassy-stm32/src/rtc/mod.rs index 1f1abb78..0f915951 100644 --- a/embassy-stm32/src/rtc/mod.rs +++ b/embassy-stm32/src/rtc/mod.rs @@ -10,6 +10,7 @@ use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex; use embassy_sync::blocking_mutex::Mutex; pub use self::datetime::{DateTime, DayOfWeek, Error as DateTimeError}; +use crate::rcc::bd::BackupDomain; /// refer to AN4759 to compare features of RTC2 and RTC3 #[cfg_attr(any(rtc_v1), path = "v1.rs")] @@ -107,19 +108,6 @@ pub struct Rtc { stop_time: Mutex>>, } -#[derive(Copy, Clone, Debug, PartialEq)] -#[repr(u8)] -pub enum RtcClockSource { - /// 00: No clock - NoClock = 0b00, - /// 01: LSE oscillator clock used as RTC clock - LSE = 0b01, - /// 10: LSI oscillator clock used as RTC clock - LSI = 0b10, - /// 11: HSE oscillator clock divided by 32 used as RTC clock - HSE = 0b11, -} - #[derive(Copy, Clone, PartialEq)] pub struct RtcConfig { /// Asynchronous prescaler factor @@ -189,7 +177,7 @@ impl Rtc { stop_time: Mutex::const_new(CriticalSectionRawMutex::new(), Cell::new(None)), }; - Self::enable(); + BackupDomain::enable_rtc(); rtc_struct.configure(rtc_config); rtc_struct.rtc_config = rtc_config; diff --git a/embassy-stm32/src/rtc/v2.rs b/embassy-stm32/src/rtc/v2.rs index bf926f98..1e0ca9b4 100644 --- a/embassy-stm32/src/rtc/v2.rs +++ b/embassy-stm32/src/rtc/v2.rs @@ -2,7 +2,7 @@ use stm32_metapac::rtc::vals::{Init, Osel, Pol}; #[cfg(feature = "low-power")] use super::RtcInstant; -use super::{sealed, RtcClockSource, RtcConfig}; +use super::{sealed, RtcConfig}; use crate::pac::rtc::Rtc; use crate::peripherals::RTC; use crate::rtc::sealed::Instance; @@ -73,22 +73,6 @@ impl WakeupPrescaler { } impl super::Rtc { - fn unlock_registers() { - #[cfg(any(rtc_v2f2, rtc_v2f3, rtc_v2l1))] - let cr = crate::pac::PWR.cr(); - #[cfg(any(rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l4, rtc_v2wb))] - let cr = crate::pac::PWR.cr1(); - - // TODO: Missing from PAC for l0 and f0? - #[cfg(not(any(rtc_v2f0, rtc_v2l0)))] - { - if !cr.read().dbp() { - cr.modify(|w| w.set_dbp(true)); - while !cr.read().dbp() {} - } - } - } - #[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 @@ -155,69 +139,6 @@ impl super::Rtc { }) } - #[allow(dead_code)] - pub(crate) fn set_clock_source(clock_source: RtcClockSource) { - #[cfg(not(rtc_v2wb))] - use stm32_metapac::rcc::vals::Rtcsel; - - #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] - let cr = crate::pac::RCC.bdcr(); - #[cfg(any(rtc_v2l0, rtc_v2l1))] - let cr = crate::pac::RCC.csr(); - - Self::unlock_registers(); - - cr.modify(|w| { - // Select RTC source - #[cfg(not(rtc_v2wb))] - w.set_rtcsel(Rtcsel::from_bits(clock_source as u8)); - #[cfg(rtc_v2wb)] - w.set_rtcsel(clock_source as u8); - }); - } - - pub(super) fn enable() { - #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] - let reg = crate::pac::RCC.bdcr().read(); - #[cfg(any(rtc_v2l0, rtc_v2l1))] - let reg = crate::pac::RCC.csr().read(); - - #[cfg(any(rtc_v2h7, rtc_v2l4, rtc_v2wb))] - assert!(!reg.lsecsson(), "RTC is not compatible with LSE CSS, yet."); - - if !reg.rtcen() { - Self::unlock_registers(); - - #[cfg(not(any(rtc_v2l0, rtc_v2l1, rtc_v2f2)))] - crate::pac::RCC.bdcr().modify(|w| w.set_bdrst(true)); - #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] - let cr = crate::pac::RCC.bdcr(); - #[cfg(any(rtc_v2l0, rtc_v2l1))] - let cr = crate::pac::RCC.csr(); - - cr.modify(|w| { - // Reset - #[cfg(not(any(rtc_v2l0, rtc_v2l1)))] - w.set_bdrst(false); - - w.set_rtcen(true); - w.set_rtcsel(reg.rtcsel()); - - // Restore bcdr - #[cfg(any(rtc_v2l4, rtc_v2wb))] - w.set_lscosel(reg.lscosel()); - #[cfg(any(rtc_v2l4, rtc_v2wb))] - w.set_lscoen(reg.lscoen()); - - w.set_lseon(reg.lseon()); - - #[cfg(any(rtc_v2f0, rtc_v2f7, rtc_v2h7, rtc_v2l4, rtc_v2wb))] - w.set_lsedrv(reg.lsedrv()); - w.set_lsebyp(reg.lsebyp()); - }); - } - } - /// Applies the RTC config /// It this changes the RTC clock source the time will be reset pub(super) fn configure(&mut self, rtc_config: RtcConfig) { diff --git a/embassy-stm32/src/rtc/v3.rs b/embassy-stm32/src/rtc/v3.rs index 3297303e..12952b15 100644 --- a/embassy-stm32/src/rtc/v3.rs +++ b/embassy-stm32/src/rtc/v3.rs @@ -1,74 +1,11 @@ use stm32_metapac::rtc::vals::{Calp, Calw16, Calw8, Fmt, Init, Key, Osel, Pol, TampalrmPu, TampalrmType}; -use super::{sealed, RtcCalibrationCyclePeriod, RtcClockSource, RtcConfig}; +use super::{sealed, RtcCalibrationCyclePeriod, RtcConfig}; use crate::pac::rtc::Rtc; use crate::peripherals::RTC; use crate::rtc::sealed::Instance; impl super::Rtc { - fn unlock_registers() { - // Unlock the backup domain - #[cfg(not(any(rtc_v3u5, rcc_wl5, rcc_wle)))] - { - if !crate::pac::PWR.cr1().read().dbp() { - crate::pac::PWR.cr1().modify(|w| w.set_dbp(true)); - while !crate::pac::PWR.cr1().read().dbp() {} - } - } - #[cfg(any(rcc_wl5, rcc_wle))] - { - use crate::pac::pwr::vals::Dbp; - - if crate::pac::PWR.cr1().read().dbp() != Dbp::ENABLED { - crate::pac::PWR.cr1().modify(|w| w.set_dbp(Dbp::ENABLED)); - while crate::pac::PWR.cr1().read().dbp() != Dbp::ENABLED {} - } - } - } - - #[allow(dead_code)] - pub(crate) fn set_clock_source(clock_source: RtcClockSource) { - let clock_source = clock_source as u8; - #[cfg(not(any(rcc_wl5, rcc_wle)))] - let clock_source = crate::pac::rcc::vals::Rtcsel::from_bits(clock_source); - - Self::unlock_registers(); - - crate::pac::RCC.bdcr().modify(|w| { - // Select RTC source - w.set_rtcsel(clock_source); - }); - } - - pub(super) fn enable() { - let bdcr = crate::pac::RCC.bdcr(); - - let reg = bdcr.read(); - assert!(!reg.lsecsson(), "RTC is not compatible with LSE CSS, yet."); - - if !reg.rtcen() { - Self::unlock_registers(); - - bdcr.modify(|w| w.set_bdrst(true)); - - bdcr.modify(|w| { - // Reset - w.set_bdrst(false); - - w.set_rtcen(true); - w.set_rtcsel(reg.rtcsel()); - - // Restore bcdr - w.set_lscosel(reg.lscosel()); - w.set_lscoen(reg.lscoen()); - - w.set_lseon(reg.lseon()); - w.set_lsedrv(reg.lsedrv()); - w.set_lsebyp(reg.lsebyp()); - }); - } - } - /// Applies the RTC config /// It this changes the RTC clock source the time will be reset pub(super) fn configure(&mut self, rtc_config: RtcConfig) {