Fix spi initialization

Author: Sh3Rm4n

CHANGELOG.md

@@ -24,6 +24,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - `stm32f303` is now split into `stm32f303xd` and `stm32f303xe` as they provide
   different alternate gpio functions. `stm32f303` is still available.
 
+### Fixed
+
+- Fixed wrong initialization of the SPI ([#35](https://github.com/stm32-rs/stm32f3xx-hal/pull/18))
 
 ## [v0.3.0] - 2019-08-26
 

src/spi.rs

@@ -175,13 +175,9 @@ macro_rules! hal {
                             .bit(mode.polarity == Polarity::IdleHigh)
                             .mstr()
                             .set_bit()
-                            .br();
-
-                        unsafe {
-                            w.bits(br);
-                        }
-
-                        w.spe()
+                            .br()
+                            .bits(br)
+                            .spe()
                             .set_bit()
                             .lsbfirst()
                             .clear_bit()