Make the dma module depend on the stm32f303 feature

Author: teskje

src/dma.rs

@@ -1,8 +1,6 @@
 //! Direct memory access (DMA) controller
-
-// Currently DMA is only supported for STM32F303 MCUs.
-// Remove these `allow`s once all models have support.
-#![cfg_attr(not(feature = "stm32f303"), allow(unused_imports, unused_macros))]
+//!
+//! Currently DMA is only supported for STM32F303 MCUs.
 
 use crate::{
     rcc::AHB,

src/lib.rs

@@ -122,7 +122,7 @@ pub use crate::pac::interrupt;
 
 #[cfg(feature = "device-selected")]
 pub mod delay;
-#[cfg(feature = "device-selected")]
+#[cfg(feature = "stm32f303")]
 pub mod dma;
 #[cfg(feature = "device-selected")]
 pub mod flash;

src/prelude.rs

@@ -1,5 +1,6 @@
 //! Prelude
 
+#[cfg(feature = "stm32f303")]
 pub use crate::dma::DmaExt as _stm32f3xx_hal_dma_DmaExt;
 pub use crate::flash::FlashExt as _stm32f3xx_hal_flash_FlashExt;
 pub use crate::gpio::GpioExt as _stm32f3xx_hal_gpio_GpioExt;