Create a simple working pico application

.cargo/config.toml

@@ -0,0 +1,27 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# Choose a default "cargo run" tool (see README for more info)
+# - `probe-rs` provides flashing and defmt via a hardware debugger, and stack
+#   unwind on panic
+# - elf2uf2-rs loads firmware over USB when the rp2040 is in boot mode
+runner = "probe-rs run --chip RP2040 --protocol swd"
+# runner = "elf2uf2-rs -d"
+
+rustflags = [
+  "-C", "linker=flip-link",
+  "-C", "link-arg=--nmagic",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+
+  # Code-size optimizations.
+  #   trap unreachable can save a lot of space, but requires nightly compiler.
+  #   uncomment the next line if you wish to enable it
+  # "-Z", "trap-unreachable=no",
+  "-C", "inline-threshold=5",
+  "-C", "no-vectorize-loops",
+]
+
+[build]
+target = "thumbv6m-none-eabi"
+
+[env]
+DEFMT_LOG = "debug"

.gitignore

@@ -0,0 +1 @@
+/target