stm32/dma: impl all variants

embassy-stm32/src/dma/mod.rs

@@ -1,9 +1,62 @@
-#![macro_use]
-
-#[cfg_attr(dma_v1, path = "v1.rs")]
-#[cfg_attr(dma_v2, path = "v2.rs")]
-mod _version;
-
+#[cfg(bdma)]
+mod bdma;
 #[cfg(dma)]
-#[allow(unused)]
-pub use _version::*;
+mod dma;
+#[cfg(dmamux)]
+mod dmamux;
+
+use core::future::Future;
+use embassy::util::Unborrow;
+
+#[cfg(any(bdma_v2, dma_v2, dmamux))]
+pub type Request = u8;
+#[cfg(not(any(bdma_v2, dma_v2, dmamux)))]
+pub type Request = ();
+
+pub(crate) mod sealed {
+    pub trait Channel {}
+}
+
+pub trait Channel: sealed::Channel {
+    type ReadFuture<'a>: Future<Output = ()> + 'a
+    where
+        Self: 'a;
+
+    type WriteFuture<'a>: Future<Output = ()> + 'a
+    where
+        Self: 'a;
+
+    fn read<'a>(
+        &'a mut self,
+        request: Request,
+        src: *mut u8,
+        buf: &'a mut [u8],
+    ) -> Self::ReadFuture<'a>;
+
+    fn write<'a>(
+        &'a mut self,
+        request: Request,
+        buf: &'a [u8],
+        dst: *mut u8,
+    ) -> Self::WriteFuture<'a>;
+}
+
+pub struct NoDma;
+
+unsafe impl Unborrow for NoDma {
+    type Target = NoDma;
+
+    unsafe fn unborrow(self) -> Self::Target {
+        self
+    }
+}
+
+// safety: must be called only once at startup
+pub(crate) unsafe fn init() {
+    #[cfg(bdma)]
+    bdma::init();
+    #[cfg(dma)]
+    dma::init();
+    #[cfg(dmamux)]
+    dmamux::init();
+}