WIP: dma

embassy-stm32/src/dma/mod.rs

@@ -0,0 +1,44 @@
+#![macro_use]
+
+#[cfg_attr(feature = "_dma_v1", path = "dma_v1.rs")]
+#[cfg_attr(feature = "_dma_v2", path = "dma_v2.rs")]
+mod _version;
+pub use _version::*;
+
+use crate::pac;
+
+pub(crate) mod sealed {
+    use super::*;
+
+    pub trait Channel {
+        fn num(&self) -> u8;
+
+        fn dma_num(&self) -> u8 {
+            self.num() / 8
+        }
+        fn ch_num(&self) -> u8 {
+            self.num() % 8
+        }
+
+        fn regs(&self) -> pac::dma::Dma {
+            match self.dma_num() {
+                0 => pac::DMA1,
+                _ => pac::DMA2,
+            }
+        }
+    }
+}
+
+pub trait Channel: sealed::Channel + Sized {}
+
+macro_rules! impl_dma_channel {
+    ($type:ident, $dma_num:expr, $ch_num:expr) => {
+        impl crate::dma::Channel for peripherals::$type {}
+        impl crate::dma::sealed::Channel for peripherals::$type {
+            #[inline]
+            fn num(&self) -> u8 {
+                $dma_num * 8 + $ch_num
+            }
+        }
+    };
+}