Initial Setup for the microbit v1

examples/bitfield.rs

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+#![no_main]
+#![no_std]
+
+use template_microbit as _; // global logger + panicking-behavior + memory layout
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    // value of the FREQUENCY register (nRF52840 device; RADIO peripheral)
+    let frequency: u32 = 276;
+    defmt::info!("FREQUENCY: {0=0..7}, MAP: {0=8..9}", frequency);
+
+    template_microbit::exit()
+}

examples/format.rs

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+#![no_main]
+#![no_std]
+
+use template_microbit as _; // global logger + panicking-behavior + memory layout
+use defmt::Format; // <- derive attribute
+
+#[derive(Format)]
+struct S1<T> {
+    x: u8,
+    y: T,
+}
+
+#[derive(Format)]
+struct S2 {
+    z: u8,
+}
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    let s = S1 {
+        x: 42,
+        y: S2 { z: 43 },
+    };
+    defmt::println!("s={:?}", s);
+    let x = 42;
+    defmt::println!("x={=u8}", x);
+
+    template_microbit::exit()
+}

examples/hello.rs

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+#![no_main]
+#![no_std]
+
+// global logger + panicking-behavior + memory layout
+
+use microbit::board::Board;
+use microbit::hal::gpio::Level::High;
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    let board = Board::take().unwrap();
+    board.display_pins.col1.into_pulldown_input();
+    board.display_pins.row1.into_push_pull_output(High);
+
+    defmt::println!("Hello, world! freq ", );
+
+    template_microbit::exit()
+}

examples/levels.rs

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+#![no_main]
+#![no_std]
+
+use template_microbit as _;
+use template_microbit::exit;
+// global logger + panicking-behavior + memory layout
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    // try setting the DEFMT_LOG environment variable
+    // e.g. `export DEFMT_LOG=info` or `DEFMT_LOG=trace cargo rb levels`
+    defmt::info!("info");
+    defmt::trace!("trace");
+    defmt::warn!("warn");
+    defmt::debug!("debug");
+    defmt::error!("error");
+    exit();
+
+    template_microbit::exit()
+}

examples/overflow.rs

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+#![no_main]
+#![no_std]
+
+use template_microbit as _; // global logger + panicking-behavior + memory layout
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    ack(10, 10);
+    template_microbit::exit()
+}
+
+fn ack(m: u32, n: u32) -> u32 {
+    // waste stack space to trigger a stack overflow
+    let mut buffer = [0u8; 16 * 1024];
+    // estimate of the Stack Pointer register
+    let sp = buffer.as_mut_ptr();
+    defmt::println!("ack(m={=u32}, n={=u32}, SP={:x})", m, n, sp);
+
+    if m == 0 {
+        n + 1
+    } else {
+        if n == 0 {
+            ack(m - 1, 1)
+        } else {
+            ack(m - 1, ack(m, n - 1))
+        }
+    }
+}

examples/panic.rs

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+#![no_main]
+#![no_std]
+
+use template_microbit as _; // global logger + panicking-behavior + memory layout
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    defmt::println!("main");
+
+    defmt::panic!()
+}