Change to embedded-dma

Author: thalesfragoso

CHANGELOG.md

@@ -17,6 +17,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - [breaking-change] Changed sdio::{read, write}_block buf argument to &[u8; 512].
 - Voltage regulator overdrive is enabled where supported and required for selected HCLK.
 - I2C driver updated to detect and clear all error condition flags.
+- Allow for skipping an ongoing DMA transfer if not using double buffering.
+- Change DMA traits to `embedded-dma`.
 
 ### Added
 

Cargo.toml

@@ -33,7 +33,7 @@ rand_core = "0.5.1"
 stm32f4 = "0.11"
 synopsys-usb-otg = { version = "0.2.0", features = ["cortex-m"], optional = true }
 sdio-host = { version = "0.5.0", optional = true }
-stable_deref_trait = { version = "1.2.0", default-features = false }
+embedded-dma = "0.1.0"
 
 [dependencies.bare-metal]
 version = "0.2.5"

src/dma/buffer.rs

@@ -15,10 +15,9 @@ use core::{
     ptr,
     sync::atomic::{compiler_fence, Ordering},
 };
+use embedded_dma::WriteBuffer;
 
-pub mod buffer;
 pub mod traits;
-use buffer::WriteBuffer;
 use traits::{
     sealed::{Bits, Sealed},
     Channel, DMASet, Direction, Instance, PeriAddress, RccEnable, Stream,
@@ -1072,7 +1071,7 @@ where
         self.stream.disable();
         self.stream.clear_transfer_complete_interrupt();
 
-        // "Subsequent reads and writes cannot be moved ahead of preceding reads."
+        // "No re-ordering of reads and writes across this point is allowed"
         compiler_fence(Ordering::SeqCst);
 
         // NOTE(unsafe) We now own this buffer and we won't call any &mut methods on it until