working prototype

.cargo/config.toml

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+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+#runner = "elf2uf2-rs -d" # "probe-rs run --chip RP2040"
+runner = "probe-rs run --chip RP2040"
+
+[build]
+target = "thumbv6m-none-eabi"        # Cortex-M0 and Cortex-M0+
+
+[env]
+DEFMT_LOG = "debug"

.gitignore

@@ -0,0 +1,2 @@
+/target
+/extra

.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "preLaunchTask": "${defaultBuildTask}",
+            "type": "probe-rs-debug",
+            "request": "launch",
+            "name": "probe-rs",
+            "cwd": "${workspaceFolder}",
+            // "connectUnderReset": true,
+            "chip": "RP2040",
+            "flashingConfig": {
+                "flashingEnabled": true,
+                // "haltAfterReset": true
+            },
+            "consoleLogLevel": "Console",
+            "coreConfigs": [
+                {
+                    "rttEnabled": true,
+                    "coreIndex": 0,
+                    "programBinary": "${workspaceFolder}/target/thumbv6m-none-eabi/debug/${workspaceFolderBasename}"
+                }
+            ]
+        }
+    ]
+}

.vscode/tasks.json

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+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "cargo",
+			"command": "build",
+			"problemMatcher": [
+				"$rustc"
+			],
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			},
+			"label": "rust: cargo build"
+		}
+	]
+}