Merge pull request #254 from thalesfragoso/f0-rcc

F0 rcc

11 files changed, 427 insertions, 112 deletions

diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index 8163624f3..4e37c94fe 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -45,6 +45,79 @@ net = ["embassy-net", "vcell"]
 
 # BEGIN GENERATED FEATURES
 # Generated by gen_features.py. DO NOT EDIT.
+stm32f030c6 = [ "stm32-metapac/stm32f030c6",]
+stm32f030c8 = [ "stm32-metapac/stm32f030c8",]
+stm32f030cc = [ "stm32-metapac/stm32f030cc",]
+stm32f030f4 = [ "stm32-metapac/stm32f030f4",]
+stm32f030k6 = [ "stm32-metapac/stm32f030k6",]
+stm32f030r8 = [ "stm32-metapac/stm32f030r8",]
+stm32f030rc = [ "stm32-metapac/stm32f030rc",]
+stm32f031c4 = [ "stm32-metapac/stm32f031c4",]
+stm32f031c6 = [ "stm32-metapac/stm32f031c6",]
+stm32f031e6 = [ "stm32-metapac/stm32f031e6",]
+stm32f031f4 = [ "stm32-metapac/stm32f031f4",]
+stm32f031f6 = [ "stm32-metapac/stm32f031f6",]
+stm32f031g4 = [ "stm32-metapac/stm32f031g4",]
+stm32f031g6 = [ "stm32-metapac/stm32f031g6",]
+stm32f031k4 = [ "stm32-metapac/stm32f031k4",]
+stm32f031k6 = [ "stm32-metapac/stm32f031k6",]
+stm32f038c6 = [ "stm32-metapac/stm32f038c6",]
+stm32f038e6 = [ "stm32-metapac/stm32f038e6",]
+stm32f038f6 = [ "stm32-metapac/stm32f038f6",]
+stm32f038g6 = [ "stm32-metapac/stm32f038g6",]
+stm32f038k6 = [ "stm32-metapac/stm32f038k6",]
+stm32f042c4 = [ "stm32-metapac/stm32f042c4",]
+stm32f042c6 = [ "stm32-metapac/stm32f042c6",]
+stm32f042f4 = [ "stm32-metapac/stm32f042f4",]
+stm32f042f6 = [ "stm32-metapac/stm32f042f6",]
+stm32f042g4 = [ "stm32-metapac/stm32f042g4",]
+stm32f042g6 = [ "stm32-metapac/stm32f042g6",]
+stm32f042k4 = [ "stm32-metapac/stm32f042k4",]
+stm32f042k6 = [ "stm32-metapac/stm32f042k6",]
+stm32f042t6 = [ "stm32-metapac/stm32f042t6",]
+stm32f048c6 = [ "stm32-metapac/stm32f048c6",]
+stm32f048g6 = [ "stm32-metapac/stm32f048g6",]
+stm32f048t6 = [ "stm32-metapac/stm32f048t6",]
+stm32f051c4 = [ "stm32-metapac/stm32f051c4",]
+stm32f051c6 = [ "stm32-metapac/stm32f051c6",]
+stm32f051c8 = [ "stm32-metapac/stm32f051c8",]
+stm32f051k4 = [ "stm32-metapac/stm32f051k4",]
+stm32f051k6 = [ "stm32-metapac/stm32f051k6",]
+stm32f051k8 = [ "stm32-metapac/stm32f051k8",]
+stm32f051r4 = [ "stm32-metapac/stm32f051r4",]
+stm32f051r6 = [ "stm32-metapac/stm32f051r6",]
+stm32f051r8 = [ "stm32-metapac/stm32f051r8",]
+stm32f051t8 = [ "stm32-metapac/stm32f051t8",]
+stm32f058c8 = [ "stm32-metapac/stm32f058c8",]
+stm32f058r8 = [ "stm32-metapac/stm32f058r8",]
+stm32f058t8 = [ "stm32-metapac/stm32f058t8",]
+stm32f070c6 = [ "stm32-metapac/stm32f070c6",]
+stm32f070cb = [ "stm32-metapac/stm32f070cb",]
+stm32f070f6 = [ "stm32-metapac/stm32f070f6",]
+stm32f070rb = [ "stm32-metapac/stm32f070rb",]
+stm32f071c8 = [ "stm32-metapac/stm32f071c8",]
+stm32f071cb = [ "stm32-metapac/stm32f071cb",]
+stm32f071rb = [ "stm32-metapac/stm32f071rb",]
+stm32f071v8 = [ "stm32-metapac/stm32f071v8",]
+stm32f071vb = [ "stm32-metapac/stm32f071vb",]
+stm32f072c8 = [ "stm32-metapac/stm32f072c8",]
+stm32f072cb = [ "stm32-metapac/stm32f072cb",]
+stm32f072r8 = [ "stm32-metapac/stm32f072r8",]
+stm32f072rb = [ "stm32-metapac/stm32f072rb",]
+stm32f072v8 = [ "stm32-metapac/stm32f072v8",]
+stm32f072vb = [ "stm32-metapac/stm32f072vb",]
+stm32f078cb = [ "stm32-metapac/stm32f078cb",]
+stm32f078rb = [ "stm32-metapac/stm32f078rb",]
+stm32f078vb = [ "stm32-metapac/stm32f078vb",]
+stm32f091cb = [ "stm32-metapac/stm32f091cb",]
+stm32f091cc = [ "stm32-metapac/stm32f091cc",]
+stm32f091rb = [ "stm32-metapac/stm32f091rb",]
+stm32f091rc = [ "stm32-metapac/stm32f091rc",]
+stm32f091vb = [ "stm32-metapac/stm32f091vb",]
+stm32f091vc = [ "stm32-metapac/stm32f091vc",]
+stm32f098cc = [ "stm32-metapac/stm32f098cc",]
+stm32f098rc = [ "stm32-metapac/stm32f098rc",]
+stm32f098vc = [ "stm32-metapac/stm32f098vc",]
 stm32f401cb = [ "stm32-metapac/stm32f401cb",]
 stm32f401cc = [ "stm32-metapac/stm32f401cc",]
 stm32f401cd = [ "stm32-metapac/stm32f401cd",]
diff --git a/embassy-stm32/gen.py b/embassy-stm32/gen.py
index b9391d309..386c5ce17 100644
--- a/embassy-stm32/gen.py
+++ b/embassy-stm32/gen.py
@@ -33,10 +33,6 @@ if len(c) > 1:
 with open(f'{data_path}/chips/{chip_name}.yaml', 'r') as f:
     chip = yaml.load(f, Loader=SafeLoader)
 
-# ======= load GPIO AF
-with open(f'{data_path}/gpio_af/{chip["gpio_af"]}.yaml', 'r') as f:
-    af = yaml.load(f, Loader=SafeLoader)
-
 # ======= Generate!
 with open(output_file, 'w') as f:
     singletons = []  # USART1, PA5, EXTI8
diff --git a/embassy-stm32/gen_features.py b/embassy-stm32/gen_features.py
index 10dfd7884..4eb57e2a3 100644
--- a/embassy-stm32/gen_features.py
+++ b/embassy-stm32/gen_features.py
@@ -13,6 +13,7 @@ dname = os.path.dirname(abspath)
 os.chdir(dname)
 
 supported_families = [
+    "STM32F0",
     'STM32F4',
     'STM32L0',
     'STM32L4',
diff --git a/embassy-stm32/src/exti/mod.rs b/embassy-stm32/src/exti/mod.rs
new file mode 100644
index 000000000..126a6fb64
--- /dev/null
+++ b/embassy-stm32/src/exti/mod.rs
@@ -0,0 +1,111 @@
+#![macro_use]
+
+macro_rules! foreach_exti_irq {
+    ($action:ident) => {
+        crate::pac::interrupts!(
+            (EXTI0)  => { $action!(EXTI0); };
+            (EXTI1)  => { $action!(EXTI1); };
+            (EXTI2)  => { $action!(EXTI2); };
+            (EXTI3)  => { $action!(EXTI3); };
+            (EXTI4)  => { $action!(EXTI4); };
+            (EXTI5)  => { $action!(EXTI5); };
+            (EXTI6)  => { $action!(EXTI6); };
+            (EXTI7)  => { $action!(EXTI7); };
+            (EXTI8)  => { $action!(EXTI8); };
+            (EXTI9)  => { $action!(EXTI9); };
+            (EXTI10) => { $action!(EXTI10); };
+            (EXTI11) => { $action!(EXTI11); };
+            (EXTI12) => { $action!(EXTI12); };
+            (EXTI13) => { $action!(EXTI13); };
+            (EXTI14) => { $action!(EXTI14); };
+            (EXTI15) => { $action!(EXTI15); };
+
+            // plus the weird ones
+            (EXTI0_1)   => { $action!( EXTI0_1 ); };
+            (EXTI15_10) => { $action!(EXTI15_10); };
+            (EXTI15_4)  => { $action!(EXTI15_4); };
+            (EXTI1_0)   => { $action!(EXTI1_0); };
+            (EXTI2_3)   => { $action!(EXTI2_3); };
+            (EXTI2_TSC) => { $action!(EXTI2_TSC); };
+            (EXTI3_2)   => { $action!(EXTI3_2); };
+            (EXTI4_15)  => { $action!(EXTI4_15); };
+            (EXTI9_5)   => { $action!(EXTI9_5); };
+        );
+    };
+}
+
+#[cfg_attr(exti_v1, path = "v1.rs")]
+#[cfg_attr(exti_wb55, path = "v2.rs")]
+mod _version;
+
+#[allow(unused)]
+pub use _version::*;
+
+use crate::peripherals;
+use embassy_extras::unsafe_impl_unborrow;
+
+pub(crate) mod sealed {
+    pub trait Channel {}
+}
+
+pub trait Channel: sealed::Channel + Sized {
+    fn number(&self) -> usize;
+    fn degrade(self) -> AnyChannel {
+        AnyChannel {
+            number: self.number() as u8,
+        }
+    }
+}
+
+pub struct AnyChannel {
+    number: u8,
+}
+unsafe_impl_unborrow!(AnyChannel);
+impl sealed::Channel for AnyChannel {}
+impl Channel for AnyChannel {
+    fn number(&self) -> usize {
+        self.number as usize
+    }
+}
+
+macro_rules! impl_exti {
+    ($type:ident, $number:expr) => {
+        impl sealed::Channel for peripherals::$type {}
+        impl Channel for peripherals::$type {
+            fn number(&self) -> usize {
+                $number as usize
+            }
+        }
+    };
+}
+
+impl_exti!(EXTI0, 0);
+impl_exti!(EXTI1, 1);
+impl_exti!(EXTI2, 2);
+impl_exti!(EXTI3, 3);
+impl_exti!(EXTI4, 4);
+impl_exti!(EXTI5, 5);
+impl_exti!(EXTI6, 6);
+impl_exti!(EXTI7, 7);
+impl_exti!(EXTI8, 8);
+impl_exti!(EXTI9, 9);
+impl_exti!(EXTI10, 10);
+impl_exti!(EXTI11, 11);
+impl_exti!(EXTI12, 12);
+impl_exti!(EXTI13, 13);
+impl_exti!(EXTI14, 14);
+impl_exti!(EXTI15, 15);
+
+macro_rules! enable_irq {
+    ($e:ident) => {
+        crate::interrupt::$e::steal().enable();
+    };
+}
+
+/// safety: must be called only once
+pub(crate) unsafe fn init() {
+    use embassy::interrupt::Interrupt;
+    use embassy::interrupt::InterruptExt;
+
+    foreach_exti_irq!(enable_irq);
+}
diff --git a/embassy-stm32/src/exti.rs b/embassy-stm32/src/exti/v1.rs
index 90d4afd56..caf457605 100644
--- a/embassy-stm32/src/exti.rs
+++ b/embassy-stm32/src/exti/v1.rs
@@ -1,4 +1,3 @@
-#![macro_use]
 use core::convert::Infallible;
 use core::future::Future;
 use core::marker::PhantomData;
@@ -6,14 +5,12 @@ use core::pin::Pin;
 use core::task::{Context, Poll};
 use embassy::traits::gpio::{WaitForAnyEdge, WaitForFallingEdge, WaitForRisingEdge};
 use embassy::util::{AtomicWaker, Unborrow};
-use embassy_extras::unsafe_impl_unborrow;
 use embedded_hal::digital::v2::InputPin;
 use pac::exti::{regs, vals};
 
 use crate::gpio::{AnyPin, Input, Pin as GpioPin};
 use crate::pac;
 use crate::pac::{EXTI, SYSCFG};
-use crate::peripherals;
 
 const EXTI_COUNT: usize = 16;
 const NEW_AW: AtomicWaker = AtomicWaker::new();
@@ -160,106 +157,6 @@ impl<'a> Future for ExtiInputFuture<'a> {
     }
 }
 
-pub(crate) mod sealed {
-    pub trait Channel {}
-}
-
-pub trait Channel: sealed::Channel + Sized {
-    fn number(&self) -> usize;
-    fn degrade(self) -> AnyChannel {
-        AnyChannel {
-            number: self.number() as u8,
-        }
-    }
-}
-
-pub struct AnyChannel {
-    number: u8,
-}
-unsafe_impl_unborrow!(AnyChannel);
-impl sealed::Channel for AnyChannel {}
-impl Channel for AnyChannel {
-    fn number(&self) -> usize {
-        self.number as usize
-    }
-}
-
-macro_rules! impl_exti {
-    ($type:ident, $number:expr) => {
-        impl sealed::Channel for peripherals::$type {}
-        impl Channel for peripherals::$type {
-            fn number(&self) -> usize {
-                $number as usize
-            }
-        }
-    };
-}
-
-impl_exti!(EXTI0, 0);
-impl_exti!(EXTI1, 1);
-impl_exti!(EXTI2, 2);
-impl_exti!(EXTI3, 3);
-impl_exti!(EXTI4, 4);
-impl_exti!(EXTI5, 5);
-impl_exti!(EXTI6, 6);
-impl_exti!(EXTI7, 7);
-impl_exti!(EXTI8, 8);
-impl_exti!(EXTI9, 9);
-impl_exti!(EXTI10, 10);
-impl_exti!(EXTI11, 11);
-impl_exti!(EXTI12, 12);
-impl_exti!(EXTI13, 13);
-impl_exti!(EXTI14, 14);
-impl_exti!(EXTI15, 15);
-
-macro_rules! foreach_exti_irq {
-    ($action:ident) => {
-        crate::pac::interrupts!(
-            (EXTI0)  => { $action!(EXTI0); };
-            (EXTI1)  => { $action!(EXTI1); };
-            (EXTI2)  => { $action!(EXTI2); };
-            (EXTI3)  => { $action!(EXTI3); };
-            (EXTI4)  => { $action!(EXTI4); };
-            (EXTI5)  => { $action!(EXTI5); };
-            (EXTI6)  => { $action!(EXTI6); };
-            (EXTI7)  => { $action!(EXTI7); };
-            (EXTI8)  => { $action!(EXTI8); };
-            (EXTI9)  => { $action!(EXTI9); };
-            (EXTI10) => { $action!(EXTI10); };
-            (EXTI11) => { $action!(EXTI11); };
-            (EXTI12) => { $action!(EXTI12); };
-            (EXTI13) => { $action!(EXTI13); };
-            (EXTI14) => { $action!(EXTI14); };
-            (EXTI15) => { $action!(EXTI15); };
-
-            // plus the weird ones
-            (EXTI0_1)   => { $action!( EXTI0_1 ); };
-            (EXTI15_10) => { $action!(EXTI15_10); };
-            (EXTI15_4)  => { $action!(EXTI15_4); };
-            (EXTI1_0)   => { $action!(EXTI1_0); };
-            (EXTI2_3)   => { $action!(EXTI2_3); };
-            (EXTI2_TSC) => { $action!(EXTI2_TSC); };
-            (EXTI3_2)   => { $action!(EXTI3_2); };
-            (EXTI4_15)  => { $action!(EXTI4_15); };
-            (EXTI9_5)   => { $action!(EXTI9_5); };
-        );
-    };
-}
-
-macro_rules! enable_irq {
-    ($e:ident) => {
-        crate::interrupt::$e::steal().enable();
-    };
-}
-
-/// safety: must be called only once
-pub(crate) unsafe fn init() {
-    use embassy::interrupt::Interrupt;
-    use embassy::interrupt::InterruptExt;
-
-    foreach_exti_irq!(enable_irq);
-}
-
 use crate::interrupt;
 
 macro_rules! impl_irq {
diff --git a/embassy-stm32/src/exti/v2.rs b/embassy-stm32/src/exti/v2.rs
new file mode 100644
index 000000000..8b1378917
--- /dev/null
+++ b/embassy-stm32/src/exti/v2.rs
@@ -0,0 +1 @@
+
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 39ccd54f0..9ba7bbe4c 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -16,7 +16,6 @@ pub mod interrupt;
 pub mod time;
 
 // Always-present hardware
-pub mod exti;
 pub mod gpio;
 pub mod rcc;
 
@@ -31,6 +30,8 @@ pub mod dac;
 pub mod dma;
 #[cfg(all(eth, feature = "net"))]
 pub mod eth;
+#[cfg(exti)]
+pub mod exti;
 #[cfg(i2c)]
 pub mod i2c;
 #[cfg(pwr)]
@@ -83,10 +84,9 @@ pub fn init(config: Config) -> Peripherals {
     let p = Peripherals::take();
 
     unsafe {
-        exti::init();
-
         #[cfg(dma)]
         dma::init();
+        #[cfg(exti)]
         exti::init();
         rcc::init(config.rcc);
     }
diff --git a/embassy-stm32/src/rcc/f0/mod.rs b/embassy-stm32/src/rcc/f0/mod.rs
new file mode 100644
index 000000000..8ddacb8ef
--- /dev/null
+++ b/embassy-stm32/src/rcc/f0/mod.rs
@@ -0,0 +1,231 @@
+use core::marker::PhantomData;
+
+use embassy::util::Unborrow;
+
+use crate::pac::{DBGMCU, FLASH, RCC};
+use crate::peripherals;
+use crate::time::Hertz;
+
+use super::{set_freqs, Clocks};
+
+const HSI: u32 = 8_000_000;
+
+/// Configuration of the clocks
+///
+/// hse takes precedence over hsi48 if both are enabled
+#[non_exhaustive]
+#[derive(Default)]
+pub struct Config {
+    pub hse: Option<Hertz>,
+    pub bypass_hse: bool,
+    pub usb_pll: bool,
+
+    #[cfg(rcc_f0)]
+    pub hsi48: bool,
+
+    pub sys_ck: Option<Hertz>,
+    pub hclk: Option<Hertz>,
+    pub pclk: Option<Hertz>,
+    pub enable_debug_wfe: bool,
+}
+
+pub struct Rcc<'d> {
+    inner: PhantomData<&'d ()>,
+    config: Config,
+}
+
+impl<'d> Rcc<'d> {
+    pub fn new(_rcc: impl Unborrow<Target = peripherals::RCC> + 'd, config: Config) -> Self {
+        Self {
+            inner: PhantomData,
+            config,
+        }
+    }
+
+    pub fn freeze(self) -> Clocks {
+        use crate::pac::rcc::vals::{Hpre, Hsebyp, Pllmul, Pllsrc, Ppre, Sw, Usbsw};
+
+        let sysclk = self.config.sys_ck.map(|v| v.0).unwrap_or(HSI);
+
+        let (src_clk, use_hsi48) = self.config.hse.map(|v| (v.0, false)).unwrap_or_else(|| {
+            #[cfg(rcc_f0)]
+            if self.config.hsi48 {
+                return (48_000_000, true);
+            }
+            (HSI, false)
+        });
+
+        let (pllmul_bits, real_sysclk) = if sysclk == src_clk {
+            (None, sysclk)
+        } else {
+            let prediv = if self.config.hse.is_some() { 1 } else { 2 };
+            let pllmul = (2 * prediv * sysclk + src_clk) / src_clk / 2;
+            let pllmul = pllmul.max(2).min(16);
+
+            let pllmul_bits = pllmul as u8 - 2;
+            let real_sysclk = pllmul * src_clk / prediv;
+            (Some(pllmul_bits), real_sysclk)
+        };
+
+        let hpre_bits = self
+            .config
+            .hclk
+            .map(|hclk| match real_sysclk / hclk.0 {
+                0 => unreachable!(),
+                1 => 0b0111,
+                2 => 0b1000,
+                3..=5 => 0b1001,
+                6..=11 => 0b1010,
+                12..=39 => 0b1011,
+                40..=95 => 0b1100,
+                96..=191 => 0b1101,
+                192..=383 => 0b1110,
+                _ => 0b1111,
+            })
+            .unwrap_or(0b0111);
+        let hclk = real_sysclk / (1 << (hpre_bits - 0b0111));
+
+        let ppre_bits = self
+            .config
+            .pclk
+            .map(|pclk| match hclk / pclk.0 {
+                0 => unreachable!(),
+                1 => 0b011,
+                2 => 0b100,
+                3..=5 => 0b101,
+                6..=11 => 0b110,
+                _ => 0b111,
+            })
+            .unwrap_or(0b011);
+
+        let ppre: u8 = 1 << (ppre_bits - 0b011);
+        let pclk = hclk / u32::from(ppre);
+
+        let timer_mul = if ppre == 1 { 1 } else { 2 };
+
+        // NOTE(safety) Atomic write
+        unsafe {
+            FLASH.acr().write(|w| {
+                let latency = if real_sysclk <= 24_000_000 {
+                    0
+                } else if real_sysclk <= 48_000_000 {
+                    1
+                } else {
+                    2
+                };
+                w.latency().0 = latency;
+            });
+        }
+
+        // NOTE(unsafe) We have exclusive access to the RCC
+        unsafe {
+            match (self.config.hse.is_some(), use_hsi48) {
+                (true, _) => {
+                    RCC.cr().modify(|w| {
+                        w.set_csson(true);
+                        w.set_hseon(true);
+
+                        if self.config.bypass_hse {
+                            w.set_hsebyp(Hsebyp::BYPASSED);
+                        }
+                    });
+                    while !RCC.cr().read().hserdy() {}
+
+                    if pllmul_bits.is_some() {
+                        RCC.cfgr().modify(|w| w.set_pllsrc(Pllsrc::HSE_DIV_PREDIV))
+                    }
+                }
+                (false, true) => {
+                    // use_hsi48 will always be false for rcc_f0x0
+                    #[cfg(rcc_f0)]
+                    RCC.cr2().modify(|w| w.set_hsi48on(true));
+                    #[cfg(rcc_f0)]
+                    while !RCC.cr2().read().hsi48rdy() {}
+
+                    #[cfg(rcc_f0)]
+                    if pllmul_bits.is_some() {
+                        RCC.cfgr()
+                            .modify(|w| w.set_pllsrc(Pllsrc::HSI48_DIV_PREDIV))
+                    }
+                }
+                _ => {
+                    RCC.cr().modify(|w| w.set_hsion(true));
+                    while !RCC.cr().read().hsirdy() {}
+
+                    if pllmul_bits.is_some() {
+                        RCC.cfgr().modify(|w| w.set_pllsrc(Pllsrc::HSI_DIV2))
+                    }
+                }
+            }
+
+            if self.config.usb_pll {
+                RCC.cfgr3().modify(|w| w.set_usbsw(Usbsw::PLLCLK));
+            }
+            // TODO: Option to use CRS (Clock Recovery)
+
+            if let Some(pllmul_bits) = pllmul_bits {
+                RCC.cfgr().modify(|w| w.set_pllmul(Pllmul(pllmul_bits)));
+
+                RCC.cr().modify(|w| w.set_pllon(true));
+                while !RCC.cr().read().pllrdy() {}
+
+                RCC.cfgr().modify(|w| {
+                    w.set_ppre(Ppre(ppre_bits));
+                    w.set_hpre(Hpre(hpre_bits));
+                    w.set_sw(Sw::PLL)
+                });
+            } else {
+                RCC.cfgr().modify(|w| {
+                    w.set_ppre(Ppre(ppre_bits));
+                    w.set_hpre(Hpre(hpre_bits));
+
+                    if self.config.hse.is_some() {
+                        w.set_sw(Sw::HSE);
+                    } else if use_hsi48 {
+                        #[cfg(rcc_f0)]
+                        w.set_sw(Sw::HSI48);
+                    } else {
+                        w.set_sw(Sw::HSI)
+                    }
+                })
+            }
+
+            if self.config.enable_debug_wfe {
+                RCC.ahbenr().modify(|w| w.set_dmaen(true));
+
+                critical_section::with(|_| {
+                    DBGMCU.cr().modify(|w| {
+                        w.set_dbg_standby(true);
+                        w.set_dbg_stop(true);
+                    });
+                });
+            }
+        }
+
+        Clocks {
+            sys: Hertz(real_sysclk),
+            apb1: Hertz(pclk),
+            apb1_tim: Hertz(pclk * timer_mul),
+            apb2_tim: Hertz(0),
+            ahb: Hertz(hclk),
+        }
+    }
+}
+
+pub unsafe fn init(config: Config) {
+    RCC.ahbenr().modify(|w| {
+        w.set_iopaen(true);
+        w.set_iopben(true);
+        w.set_iopcen(true);
+        w.set_iopden(true);
+
+        #[cfg(rcc_f0)]
+        w.set_iopeen(true);
+
+        w.set_iopfen(true);
+    });
+
+    let rcc = Rcc::new(<peripherals::RCC as embassy::util::Steal>::steal(), config);
+    let clocks = rcc.freeze();
+    set_freqs(clocks);
+}
diff --git a/embassy-stm32/src/rcc/mod.rs b/embassy-stm32/src/rcc/mod.rs
index e84021272..91e8b5bef 100644
--- a/embassy-stm32/src/rcc/mod.rs
+++ b/embassy-stm32/src/rcc/mod.rs
@@ -9,11 +9,14 @@ mod types;
 pub struct Clocks {
     pub sys: Hertz,
     pub apb1: Hertz,
+
+    #[cfg(not(any(rcc_f0, rcc_f0x0)))]
     pub apb2: Hertz,
+
     pub apb1_tim: Hertz,
     pub apb2_tim: Hertz,
 
-    #[cfg(any(rcc_l0))]
+    #[cfg(any(rcc_l0, rcc_f0, rcc_f0x0))]
     pub ahb: Hertz,
 
     #[cfg(any(rcc_l4, rcc_f4, rcc_h7, rcc_wb55, rcc_wl5x))]
@@ -65,6 +68,9 @@ cfg_if::cfg_if! {
     } else if #[cfg(rcc_wl5x)] {
         mod wl5x;
         pub use wl5x::*;
+    } else if #[cfg(any(rcc_f0, rcc_f0x0))] {
+        mod f0;
+        pub use f0::*;
     }
 }
 
diff --git a/stm32-data b/stm32-data
-Subproject 18f86c83123771048f971350c99c4f810385d7d
+Subproject eb76ee900ac67b51497196572250323e82666b4
diff --git a/stm32-metapac/gen/src/lib.rs b/stm32-metapac/gen/src/lib.rs
index a5c061009..9e7add452 100644
--- a/stm32-metapac/gen/src/lib.rs
+++ b/stm32-metapac/gen/src/lib.rs
@@ -19,7 +19,6 @@ pub struct Chip {
     pub cores: Vec<Core>,
     pub flash: u32,
     pub ram: u32,
-    pub gpio_af: String,
     pub packages: Vec<Package>,
 }