bsp(pygamer): Add defmt feature

Author: ianrrees

boards/pygamer/.cargo/config.toml

@@ -6,10 +6,14 @@ runner = "hf2 elf"
 [build]
 target = "thumbv7em-none-eabihf"
 rustflags = [
-
    # This is needed if your flash or ram addresses are not aligned to 0x10000 in memory.x
    # See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
    "-C", "link-arg=--nmagic",
 
+   # To use defmt, the linker needs to be provided with this argument.  The BSP
+   # uses build.rs to supply it conditionally, uncomment this line to use it
+   # unconditionally.
+   # "-C", "link-arg=-Tdefmt.x",
+
    "-C", "link-arg=-Tlink.x",
 ]

boards/pygamer/Cargo.toml

@@ -52,6 +52,8 @@ usbd-serial = "0.2"
 [features]
 # ask the HAL to enable atsamd51j support
 default = ["rt", "atsamd-hal/samd51j"]
+# Use DEFMT_LOG environment variable to set logging level, defaults to `error`
+defmt = ["atsamd-hal/defmt"]
 dma = ["atsamd-hal/dma"]
 max-channels = ["dma", "atsamd-hal/max-channels"]
 neopixel-spi = ["dep:ws2812-spi"]

boards/pygamer/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");
 }