DAC v2 basics.

5 files changed, 343 insertions, 0 deletions

diff --git a/embassy-stm32/gen.py b/embassy-stm32/gen.py
index b2b95ca8f..bfb791945 100644
--- a/embassy-stm32/gen.py
+++ b/embassy-stm32/gen.py
@@ -145,6 +145,15 @@ with open(output_file, 'w') as f:
                 if re.match('EXTI', irq):
                     exti_interrupts.append(irq)
 
+        if block_mod == 'dac':
+            f.write(f'impl_dac!({name});')
+            if 'dac_out1' in peri:
+                pin = peri['dac_out1']
+                f.write(f'impl_dac_pin!({name}, 1, {pin});')
+            if 'dac_out2' in peri:
+                pin = peri['dac_out2']
+                f.write(f'impl_dac_pin!({name}, 2, {pin});')
+
         if not custom_singletons:
             singletons.append(name)
 
diff --git a/embassy-stm32/src/dac/mod.rs b/embassy-stm32/src/dac/mod.rs
new file mode 100644
index 000000000..e1a603d40
--- /dev/null
+++ b/embassy-stm32/src/dac/mod.rs
@@ -0,0 +1,48 @@
+#![macro_use]
+
+#[cfg_attr(dac_v2, path = "v2.rs")]
+mod _version;
+use crate::gpio::NoPin;
+pub use _version::*;
+
+pub(crate) mod sealed {
+    use super::*;
+    use crate::gpio::{OptionalPin, Pin};
+
+    pub trait Instance {
+        fn regs() -> &'static crate::pac::dac::Dac;
+    }
+
+    pub trait DacPin<T: Instance, const C: u8>: OptionalPin {}
+}
+
+pub trait Instance: sealed::Instance + 'static {}
+
+pub trait DacPin<T: Instance, const C: u8>: sealed::DacPin<T, C> + 'static {}
+
+impl<T: Instance, const C: u8> DacPin<T, C> for NoPin {}
+impl<T: Instance, const C: u8> sealed::DacPin<T, C> for NoPin {}
+
+macro_rules! impl_dac {
+    ($inst:ident) => {
+        impl crate::dac::sealed::Instance for peripherals::$inst {
+            fn regs() -> &'static crate::pac::dac::Dac {
+                &crate::pac::$inst
+            }
+        }
+
+        impl crate::dac::Instance for peripherals::$inst {}
+    };
+}
+
+macro_rules! impl_dac_pin {
+    ($inst:ident, $channel:expr, $pin:ident ) => {
+        impl crate::dac::DacPin<peripherals::$inst, $channel> for peripherals::$pin {}
+
+        impl crate::dac::sealed::DacPin<peripherals::$inst, $channel> for peripherals::$pin {
+            //fn af_num(&self) -> u8 {
+            //$af
+            //}
+        }
+    };
+}
diff --git a/embassy-stm32/src/dac/v2.rs b/embassy-stm32/src/dac/v2.rs
new file mode 100644
index 000000000..18ac0f86a
--- /dev/null
+++ b/embassy-stm32/src/dac/v2.rs
@@ -0,0 +1,284 @@
+use crate::dac::{DacPin, Instance};
+use crate::gpio::Pin;
+use crate::gpio::{AnyPin, OptionalPin};
+use crate::pac::dac;
+use core::marker::PhantomData;
+use embassy::util::Unborrow;
+use embassy_extras::unborrow;
+
+pub enum Error {
+    UnconfiguredChannel,
+    InvalidValue,
+}
+
+pub enum Channel {
+    Ch1,
+    Ch2,
+}
+
+pub enum Ch1Trigger {
+    Tim6,
+    Tim3,
+    Tim7,
+    Tim15,
+    Tim2,
+    Exti9,
+    Software,
+}
+
+impl Ch1Trigger {
+    fn tsel(&self) -> dac::vals::Tsel1 {
+        match self {
+            Ch1Trigger::Tim6 => dac::vals::Tsel1::TIM6_TRGO,
+            Ch1Trigger::Tim3 => dac::vals::Tsel1::TIM3_TRGO,
+            Ch1Trigger::Tim7 => dac::vals::Tsel1::TIM7_TRGO,
+            Ch1Trigger::Tim15 => dac::vals::Tsel1::TIM15_TRGO,
+            Ch1Trigger::Tim2 => dac::vals::Tsel1::TIM2_TRGO,
+            Ch1Trigger::Exti9 => dac::vals::Tsel1::EXTI9,
+            Ch1Trigger::Software => dac::vals::Tsel1::SOFTWARE,
+        }
+    }
+}
+
+pub enum Ch2Trigger {
+    Tim6,
+    Tim8,
+    Tim7,
+    Tim5,
+    Tim2,
+    Tim4,
+    Exti9,
+    Software,
+}
+
+impl Ch2Trigger {
+    fn tsel(&self) -> dac::vals::Tsel2 {
+        match self {
+            Ch2Trigger::Tim6 => dac::vals::Tsel2::TIM6_TRGO,
+            Ch2Trigger::Tim8 => dac::vals::Tsel2::TIM8_TRGO,
+            Ch2Trigger::Tim7 => dac::vals::Tsel2::TIM7_TRGO,
+            Ch2Trigger::Tim5 => dac::vals::Tsel2::TIM5_TRGO,
+            Ch2Trigger::Tim2 => dac::vals::Tsel2::TIM2_TRGO,
+            Ch2Trigger::Tim4 => dac::vals::Tsel2::TIM4_TRGO,
+            Ch2Trigger::Exti9 => dac::vals::Tsel2::EXTI9,
+            Ch2Trigger::Software => dac::vals::Tsel2::SOFTWARE,
+        }
+    }
+}
+
+pub enum Alignment {
+    Left,
+    Right,
+}
+
+pub enum Value {
+    Bit8(u8),
+    Bit12(u16, Alignment),
+}
+
+pub struct Dac<'d, T: Instance> {
+    //peri: T,
+    ch1: Option<AnyPin>,
+    ch2: Option<AnyPin>,
+    phantom: PhantomData<&'d mut T>,
+}
+
+impl<'d, T: Instance> Dac<'d, T> {
+    pub fn new(
+        peri: impl Unborrow<Target = T> + 'd,
+        ch1: impl Unborrow<Target = impl DacPin<T, 1>>,
+        ch2: impl Unborrow<Target = impl DacPin<T, 2>>,
+    ) -> Self {
+        unborrow!(peri);
+        unborrow!(ch1, ch2);
+
+        let ch1 = ch1.degrade_optional();
+        if ch1.is_some() {
+            unsafe {
+                T::regs().cr().modify(|reg| {
+                    reg.set_en1(true);
+                });
+            }
+        }
+
+        let ch2 = ch2.degrade_optional();
+        if ch2.is_some() {
+            unsafe {
+                T::regs().cr().modify(|reg| {
+                    reg.set_en2(true);
+                });
+            }
+        }
+
+        let mut dac = Self {
+            ch1,
+            ch2,
+            phantom: PhantomData,
+        };
+
+        dac
+    }
+
+    pub fn enable_channel(&mut self, ch: Channel) -> Result<(), Error> {
+        match ch {
+            Channel::Ch1 => {
+                if self.ch1.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    unsafe {
+                        T::regs().cr().modify(|reg| {
+                            reg.set_en1(true);
+                        });
+                    }
+                    Ok(())
+                }
+            }
+            Channel::Ch2 => {
+                if self.ch2.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    unsafe {
+                        T::regs().cr().modify(|reg| {
+                            reg.set_en2(true);
+                        });
+                    }
+                    Ok(())
+                }
+            }
+        }
+    }
+
+    pub fn disable_channel(&mut self, ch: Channel) -> Result<(), Error> {
+        match ch {
+            Channel::Ch1 => {
+                if self.ch1.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    unsafe {
+                        T::regs().cr().modify(|reg| {
+                            reg.set_en1(true);
+                        });
+                    }
+                    Ok(())
+                }
+            }
+            Channel::Ch2 => {
+                if self.ch2.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    unsafe {
+                        T::regs().cr().modify(|reg| {
+                            reg.set_en2(true);
+                        });
+                    }
+                    Ok(())
+                }
+            }
+        }
+    }
+
+    pub fn select_trigger_ch1(&mut self, trigger: Ch1Trigger) -> Result<(), Error> {
+        if self.ch1.is_none() {
+            return Err(Error::UnconfiguredChannel);
+        }
+        self.disable_channel(Channel::Ch1);
+        unsafe {
+            T::regs().cr().modify(|reg| {
+                reg.set_tsel1(trigger.tsel());
+            })
+        }
+        Ok(())
+    }
+
+    pub fn select_trigger_ch2(&mut self, trigger: Ch2Trigger) -> Result<(), Error> {
+        if self.ch2.is_none() {
+            return Err(Error::UnconfiguredChannel);
+        }
+        self.disable_channel(Channel::Ch2);
+        unsafe {
+            T::regs().cr().modify(|reg| {
+                reg.set_tsel2(trigger.tsel());
+            })
+        }
+        Ok(())
+    }
+
+    pub fn trigger(&mut self, ch: Channel) -> Result<(), Error> {
+        match ch {
+            Channel::Ch1 => {
+                if self.ch1.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    unsafe {
+                        T::regs().swtrigr().write(|reg| {
+                            reg.set_swtrig1(true);
+                        });
+                    }
+                    Ok(())
+                }
+            }
+            Channel::Ch2 => {
+                if self.ch2.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    unsafe {
+                        T::regs().swtrigr().write(|reg| {
+                            reg.set_swtrig2(true);
+                        });
+                    }
+                    Ok(())
+                }
+            }
+        }
+    }
+
+    pub fn trigger_all(&mut self) {
+        unsafe {
+            T::regs().swtrigr().write(|reg| {
+                reg.set_swtrig1(true);
+                reg.set_swtrig2(true);
+            })
+        }
+    }
+
+    pub fn set(&mut self, ch: Channel, value: Value) -> Result<(), Error> {
+        match ch {
+            Channel::Ch1 => {
+                if self.ch1.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    match value {
+                        Value::Bit8(v) => unsafe {
+                            T::regs().dhr8r1().write(|reg| reg.set_dacc1dhr(v));
+                        },
+                        Value::Bit12(v, Alignment::Left) => unsafe {
+                            T::regs().dhr12l1().write(|reg| reg.set_dacc1dhr(v));
+                        },
+                        Value::Bit12(v, Alignment::Right) => unsafe {
+                            T::regs().dhr12r1().write(|reg| reg.set_dacc1dhr(v));
+                        },
+                    }
+                    Ok(())
+                }
+            }
+            Channel::Ch2 => {
+                if self.ch2.is_none() {
+                    Err(Error::UnconfiguredChannel)
+                } else {
+                    match value {
+                        Value::Bit8(v) => unsafe {
+                            T::regs().dhr8r2().write(|reg| reg.set_dacc2dhr(v));
+                        },
+                        Value::Bit12(v, Alignment::Left) => unsafe {
+                            T::regs().dhr12l2().write(|reg| reg.set_dacc2dhr(v));
+                        },
+                        Value::Bit12(v, Alignment::Right) => unsafe {
+                            T::regs().dhr12r2().write(|reg| reg.set_dacc2dhr(v));
+                        },
+                    }
+                    Ok(())
+                }
+            }
+        }
+    }
+}
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 6a00f5f9b..c51f93eb5 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -23,6 +23,8 @@ pub mod rcc;
 // Sometimes-present hardware
 #[cfg(timer)]
 pub mod clock;
+#[cfg(dac)]
+pub mod dac;
 #[cfg(dma)]
 pub mod dma;
 #[cfg(i2c)]
diff --git a/stm32-data b/stm32-data
-Subproject 64220ffdbf55b802f063ab209cdd7a788c95ca5
+Subproject dfc67fe255e1e70101e9f1e3fb8b4fd8bb37362