Add RISCV target.

Author: dvc94ch

src/generate/device.rs

@@ -62,6 +62,13 @@ pub fn render(d: &Device, target: &Target) -> Result<Vec<Tokens>> {
                 extern crate msp430_rt;
             });
         }
+        Target::RISCV => {
+            out.push(quote! {
+                extern crate riscv;
+                #[cfg(feature = "rt")]
+                extern crate riscv_rt;
+            });
+        }
         Target::None => {}
     }
 
@@ -141,6 +148,7 @@ pub fn render(d: &Device, target: &Target) -> Result<Vec<Tokens>> {
     let take = match *target {
         Target::CortexM => Some(Ident::new("cortex_m")),
         Target::Msp430 => Some(Ident::new("msp430")),
+        Target::RISCV => Some(Ident::new("riscv")),
         Target::None => None,
     }.map(|krate| {
         quote! {

src/generate/interrupt.rs

@@ -169,6 +169,7 @@ pub fn render(device: &Device, target: &Target, peripherals: &[Peripheral]) -> R
                     ];
             });
         }
+        Target::RISCV => {}
         Target::None => {}
     }
 

src/main.rs

@@ -25,6 +25,7 @@ use errors::*;
 pub enum Target {
     CortexM,
     Msp430,
+    RISCV,
     None,
 }
 
@@ -33,6 +34,7 @@ impl Target {
         Ok(match s {
             "cortex-m" => Target::CortexM,
             "msp430" => Target::Msp430,
+            "riscv" => Target::RISCV,
             "none" => Target::None,
             _ => bail!("unknown target {}", s),
         })