loop, example

.vscode/launch.json

@@ -40,5 +40,23 @@
             ],
             "cwd": "${workspaceRoot}"
         },
+        {
+            "type": "gdb",
+            "request": "attach",
+            "name": "loop",
+            "gdbpath": "/usr/bin/arm-none-eabi-gdb",
+            "executable": "./target/thumbv7em-none-eabihf/debug/examples/loop",
+            "target": ":3333",
+            "remote": true,
+            "autorun": [
+                "monitor reset init",
+                "monitor arm semihosting enable",
+                "monitor tpiu config internal /tmp/itm.log uart off 64000000",
+                "monitor itm port 0 on",
+                "load",
+                "monitor reset init"
+            ],
+            "cwd": "${workspaceRoot}"
+        },
     ]
 }
\ No newline at end of file

.vscode/tasks.json

@@ -6,10 +6,7 @@
         {
             "type": "shell",
             "label": "xargo build",
-            "command": "xargo",
-            "args": [
-                "build"
-            ],
+            "command": "xargo build",
             "problemMatcher": [
                 "$rustc"
             ],
@@ -21,10 +18,7 @@
         {
             "type": "shell",
             "label": "xargo build --release",
-            "command": "xargo",
-            "args": [
-                "build --release"
-            ],
+            "command": "xargo build --release",
             "problemMatcher": [
                 "$rustc"
             ],
@@ -32,6 +26,18 @@
                 "kind": "build",
                 "isDefault": true
             }
+        },
+        {
+            "type": "shell",
+            "label": "xargo build --example loop",
+            "command": "xargo build --example loop ",
+            "problemMatcher": [
+                "$rustc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
             }
+        },
     ]
 }
\ No newline at end of file

examples/loop.rs

+//! Nesting claims and how the preemption threshold works
+//!
+//! If you run this program you'll hit the breakpoints as indicated by the
+//! letters in the comments: A, then B, then C, etc.
+#![deny(unsafe_code)]
+#![feature(proc_macro)]
+#![no_std]
+
+extern crate cortex_m;
+extern crate cortex_m_rtfm as rtfm;
+extern crate stm32f40x;
+
+#[macro_use]
+extern crate cortex_m_debug;
+
+use rtfm::app;
+
+app! {
+    device: stm32f40x,
+}
+
+fn init(_p: init::Peripherals) {
+    let mut sum = 0;
+    for i in 0..10 {
+        ipln!("i = {}", i);
+        sum += i;
+    }
+    ipln!("Sum 0 .. 10 = {}", sum);
+}
+
+#[inline(never)]
+fn idle() -> ! {
+    loop {
+        rtfm::wfi();
+    }
+}