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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,201 @@ | ||
| //! Micro-Controller Out (MCO) pins | ||
| use super::Rcc; | ||
| use crate::time::Hertz; | ||
|
|
||
| pub use crate::stm32::rcc::cfgr1::MCO1SEL as MCO1; | ||
| pub use crate::stm32::rcc::cfgr1::MCO2SEL as MCO2; | ||
|
|
||
| /// Clock settings for Micro-Controller Out 1 (MCO1) | ||
| pub struct MCO1Config { | ||
| pub(super) source: MCO1, | ||
| pub(super) frequency: Option<u32>, | ||
| } | ||
| impl Default for MCO1Config { | ||
| fn default() -> MCO1Config { | ||
| Self { | ||
| source: MCO1::Hsi, | ||
| frequency: None, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Clock settings for Micro-Controller Out 2 (MCO2) | ||
| pub struct MCO2Config { | ||
| pub(super) source: MCO2, | ||
| frequency: Option<u32>, | ||
| } | ||
| impl Default for MCO2Config { | ||
| fn default() -> MCO2Config { | ||
| Self { | ||
| source: MCO2::Sysclk, | ||
| frequency: None, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| macro_rules! calculate_prescaler { | ||
| () => { | ||
| /// Calculates the prescaler and the resulting clock frequency | ||
| pub(super) fn calculate_prescaler( | ||
| &self, | ||
| in_ck: u32, | ||
| ) -> (u8, Option<Hertz>) { | ||
| // Running? | ||
| if let Some(freq) = self.frequency { | ||
| // Calculate prescaler | ||
| let prescaler = match (in_ck + freq - 1) / freq { | ||
| 0 => unreachable!(), | ||
| x @ 1..=15 => x, | ||
| _ => { | ||
| panic!("Clock is too fast to achieve {} Hz MCO!", freq) | ||
| } | ||
| }; | ||
|
|
||
| (prescaler as u8, Some(Hertz::from_raw(in_ck / prescaler))) | ||
| } else { | ||
| // Disabled | ||
| (0, None) | ||
| } | ||
| } | ||
| }; | ||
| } | ||
| impl MCO1Config { | ||
| calculate_prescaler!(); | ||
| } | ||
| impl MCO2Config { | ||
| calculate_prescaler!(); | ||
| } | ||
|
|
||
| impl Rcc { | ||
| /// Checks the MCO1 setup and sets further requirements in `config` if they | ||
| /// are currently set to `None` | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if the MCO1 setup is invalid, or if it is inconsistent with the | ||
| /// rest of the `config` | ||
| pub(super) fn mco1_setup(&mut self) { | ||
| // HSI always runs | ||
|
|
||
| // LSE unimplemented | ||
|
|
||
| // HSE must be explicitly stated | ||
| if self.config.mco1.source == MCO1::Hse { | ||
| assert!( | ||
| self.config.hse.is_some(), | ||
| "HSE is required for MCO1. Explicitly state its frequency with `use_hse`" | ||
| ); | ||
| } | ||
|
|
||
| // Set pll1_q_ck based on requirement | ||
| if self.config.mco1.source == MCO1::Pll1Q | ||
| && self.config.pll1.q_ck.is_none() | ||
| { | ||
| self.config.pll1.q_ck = self.config.mco1.frequency; | ||
| } | ||
|
|
||
| // HSI48 always runs | ||
| } | ||
|
|
||
| /// Checks the MCO2 setup and sets further requirements in `config` if they | ||
| /// are currently set to `None` | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if the MCO2 setup is invalid, or if it is inconsistent with the | ||
| /// rest of the `config` | ||
| pub(super) fn mco2_setup(&mut self) { | ||
| // Set sysclk based on requirement | ||
| if self.config.mco2.source == MCO2::Sysclk | ||
| && self.config.sys_ck.is_none() | ||
| { | ||
| self.config.sys_ck = self.config.mco2.frequency; | ||
| } | ||
|
|
||
| // Set pll2_p_ck based on requirement | ||
| if self.config.mco2.source == MCO2::Pll2P | ||
| && self.config.pll2.p_ck.is_none() | ||
| { | ||
| self.config.pll2.p_ck = self.config.mco2.frequency; | ||
| } | ||
|
|
||
| // HSE must be explicitly stated | ||
| if self.config.mco2.source == MCO2::Hse { | ||
| assert!( | ||
| self.config.hse.is_some(), | ||
| "HSE is required for MCO2. Explicitly state its frequency with `use_hse`" | ||
| ); | ||
| } | ||
|
|
||
| // Set pll1_p_ck based on requirement | ||
| if self.config.mco2.source == MCO2::Pll1P | ||
| && self.config.pll1.p_ck.is_none() | ||
| { | ||
| self.config.pll1.p_ck = self.config.mco2.frequency; | ||
| } | ||
|
|
||
| // CSI always runs | ||
|
|
||
| // LSI unimplemented | ||
| } | ||
| } | ||
|
|
||
| macro_rules! mco1_setters { | ||
| ($($mco_setter:ident: $source:ident $doc:expr),+) => { | ||
| /// Setters for Micro-Controller Out 1 (MCO1) | ||
| impl Rcc { | ||
| $( | ||
| /// Set the MCO1 output frequency. The clock is sourced from | ||
| #[doc=$doc] | ||
| /// | ||
| /// This only enables the signal within the RCC block, it does | ||
| /// not enable the MCO1 output pin itself (use the GPIO for | ||
| /// that). | ||
| #[must_use] | ||
| pub fn $mco_setter(mut self, freq: Hertz) -> Self { | ||
| self.config.mco1.source = MCO1::$source; | ||
| self.config.mco1.frequency = Some(freq.raw()); | ||
| self | ||
| } | ||
| )+ | ||
| } | ||
| } | ||
| } | ||
| mco1_setters! { | ||
| mco1_from_hsi: Hsi "the HSI", | ||
| //mco1_from_lse: Lse "the LSE", UNIMPLEMENTED | ||
| mco1_from_hse: Hse "the HSE", | ||
| mco1_from_pll1_q_ck: Pll1Q "pll1_q_ck", | ||
| mco1_from_hsi48: Hsi48 "HSI48" | ||
| } | ||
|
|
||
| macro_rules! mco2_setters { | ||
| ($($mco_setter:ident: $source:ident $doc:expr),+) => { | ||
| /// Setters for Micro-Controller Out 2 (MCO2) | ||
| impl Rcc { | ||
| $( | ||
| /// Set the MCO2 output frequency. The clock is sourced from | ||
| #[doc=$doc] | ||
| /// | ||
| /// This only enables the signal within the RCC block, it does | ||
| /// not enable the MCO2 output pin itself (use the GPIO for | ||
| /// that). | ||
| #[must_use] | ||
| pub fn $mco_setter(mut self, freq: Hertz) -> Self { | ||
| self.config.mco2.source = MCO2::$source; | ||
| self.config.mco2.frequency = Some(freq.raw()); | ||
| self | ||
| } | ||
| )+ | ||
| } | ||
| } | ||
| } | ||
| mco2_setters! { | ||
| mco2_from_sys_ck: Sysclk "sys_ck", | ||
| mco2_from_pll2_p_ck: Pll2P "pll2_p_ck", | ||
| mco2_from_hse: Hse "the HSE", | ||
| mco2_from_pll1_p_ck: Pll1P "pll1_p_ck", | ||
| mco2_from_csi: Csi "CSI", | ||
| mco2_from_lsi: Lsi "the LSI" | ||
| } |