bsp(atsame54_xpro): Add defmt feature

Author: ianrrees

boards/atsame54_xpro/Cargo.toml

@@ -38,6 +38,7 @@ rtt-target = {version = "0.3", features = ["cortex-m"]}
 
 [features]
 default = ["rt", "atsamd-hal/same54p"]
+defmt = ["atsamd-hal/defmt"]
 dma = ["atsamd-hal/dma"]
 max-channels = ["dma", "atsamd-hal/max-channels"]
 # Enable async support from atsamd-hal

boards/atsame54_xpro/build.rs

@@ -12,5 +12,8 @@ fn main() {
         println!("cargo:rustc-link-search={}", out.display());
         println!("cargo:rerun-if-changed=memory.x");
     }
+    if env::var_os("CARGO_FEATURE_DEFMT").is_some() {
+        println!("cargo:rustc-link-arg=-Tdefmt.x");
+    }
     println!("cargo:rerun-if-changed=build.rs");
 }