Start adding embedded-dma support

core/Cargo.toml

@@ -17,6 +17,12 @@ license = "MIT OR Apache-2.0"
 [dependencies]
 generic-array = "0.13"
 cortex-m = { version = "0.6.0", optional = true }
+embedded-dma = "0.1.1"
+
+[dependencies.defmt]
+git = "https://github.com/knurling-rs/defmt"
+branch = "main"
+optional = true
 
 [features]
 thumbv6 = ["cortex-m"]
@@ -25,6 +31,15 @@ thumbv6 = ["cortex-m"]
 atomic = []
 std = []
 
+enable-defmt = ["defmt"]
+
+# do NOT modify these features
+defmt-default = []
+defmt-trace = []
+defmt-debug = []
+defmt-info = []
+defmt-warn = []
+defmt-error = []
 
 [package.metadata.docs.rs]
 all-features = true

core/src/framed.rs

@@ -310,3 +310,32 @@ where
         self
     }
 }
+
+use embedded_dma::{
+    WriteBuffer,
+    ReadBuffer,
+};
+
+unsafe impl<'a, N> WriteBuffer for FrameGrantW<'a, N>
+where
+    N: ArrayLength<u8>,
+{
+    type Word = u8;
+    unsafe fn write_buffer(&mut self) -> (*mut Self::Word, usize) {
+        let buf = self.deref_mut();
+        let len = buf.len();
+        (buf.as_mut_ptr(), len)
+    }
+}
+
+unsafe impl<'a, N> ReadBuffer for FrameGrantW<'a, N>
+where
+    N: ArrayLength<u8>,
+{
+    type Word = u8;
+    unsafe fn read_buffer(&self) -> (*const Self::Word, usize) {
+        let buf = self.deref();
+        let len = buf.len();
+        (buf.as_ptr(), len)
+    }
+}

core/src/lib.rs

@@ -136,8 +136,10 @@ pub use generic_array::ArrayLength;
 /// Result type used by the `BBQueue` interfaces
 pub type Result<T> = CoreResult<T, Error>;
 
+use defmt::Format;
+
 /// Error type used by the `BBQueue` interfaces
-#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+#[derive(Debug, PartialEq, Eq, Copy, Clone, Format)]
 pub enum Error {
     /// The buffer does not contain sufficient size for the requested action
     InsufficientSize,