Fix no_std

.cargo/config.toml

@@ -0,0 +1,4 @@
+[build]
+# Cortex-M0 and Cortex-M0+
+target = "thumbv6m-none-eabi"
+

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "rust-analyzer.check.allTargets": false
+}

Cargo.toml

@@ -10,4 +10,4 @@ embassy-rp = { version = "0.1.0", features = ["unstable-pac", "time-driver", "cr
 embassy-usb = { version = "0.1.0" }
 
 numtoa = "0.2.4"
-futures = { version = "0.3.30", defaul-features = false, features = [] }
+futures = { version = "0.3.30", default-features = false }

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+components = [ "rust-src", "rustfmt", "llvm-tools" ]
+targets = ["thumbv6m-none-eabi"]

src/lib.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 mod serial_config;
 
 use numtoa::NumToA;