stm32: add some docs.

embassy-stm32/src/dac/mod.rs

@@ -62,11 +62,11 @@ impl Mode {
 ///
 /// 12-bit values outside the permitted range are silently truncated.
 pub enum Value {
-    // 8 bit value
+    /// 8 bit value
     Bit8(u8),
-    // 12 bit value stored in a u16, left-aligned
+    /// 12 bit value stored in a u16, left-aligned
     Bit12Left(u16),
-    // 12 bit value stored in a u16, right-aligned
+    /// 12 bit value stored in a u16, right-aligned
     Bit12Right(u16),
 }
 
@@ -76,11 +76,11 @@ pub enum Value {
 ///
 /// 12-bit values outside the permitted range are silently truncated.
 pub enum DualValue {
-    // 8 bit value
+    /// 8 bit value
     Bit8(u8, u8),
-    // 12 bit value stored in a u16, left-aligned
+    /// 12 bit value stored in a u16, left-aligned
     Bit12Left(u16, u16),
-    // 12 bit value stored in a u16, right-aligned
+    /// 12 bit value stored in a u16, right-aligned
     Bit12Right(u16, u16),
 }
 
@@ -88,11 +88,11 @@ pub enum DualValue {
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 /// Array variant of [`Value`].
 pub enum ValueArray<'a> {
-    // 8 bit values
+    /// 8 bit values
     Bit8(&'a [u8]),
-    // 12 bit value stored in a u16, left-aligned
+    /// 12 bit value stored in a u16, left-aligned
     Bit12Left(&'a [u16]),
-    // 12 bit values stored in a u16, right-aligned
+    /// 12 bit values stored in a u16, right-aligned
     Bit12Right(&'a [u16]),
 }
 
@@ -106,7 +106,9 @@ pub struct DacChannel<'d, T: Instance, const N: u8, DMA = NoDma> {
     dma: PeripheralRef<'d, DMA>,
 }
 
+/// DAC channel 1 type alias.
 pub type DacCh1<'d, T, DMA = NoDma> = DacChannel<'d, T, 1, DMA>;
+/// DAC channel 2 type alias.
 pub type DacCh2<'d, T, DMA = NoDma> = DacChannel<'d, T, 2, DMA>;
 
 impl<'d, T: Instance, const N: u8, DMA> DacChannel<'d, T, N, DMA> {
@@ -492,6 +494,7 @@ pub(crate) mod sealed {
     }
 }
 
+/// DAC instance.
 pub trait Instance: sealed::Instance + RccPeripheral + 'static {}
 dma_trait!(DacDma1, Instance);
 dma_trait!(DacDma2, Instance);