test no_std in CI

Author: RCasatta

.github/workflows/rust.yml

@@ -63,3 +63,21 @@ jobs:
         with:
           command: clippy
           args: -- -D warnings
+
+  Embedded:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Checkout Toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          components: rust-src
+          target: thumbv7m-none-eabi
+      - name: Build
+        env:
+          RUSTFLAGS: "-C link-arg=-Tlink.x"
+        run: cd embedded && cargo build --target thumbv7m-none-eabi

.gitignore

@@ -1,3 +1,6 @@
 **/target
 *.o
 /Cargo.lock
+
+/embedded/Cargo.lock
+/embedded/.cargo

embedded/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+authors = ["Riccardo Casatta <[email protected]>"]
+edition = "2018"
+readme = "README.md"
+name = "embedded"
+version = "0.1.0"
+
+[dependencies]
+cortex-m = "0.6.0"
+cortex-m-rt = "0.6.10"
+cortex-m-semihosting = "0.3.3"
+panic-halt = "0.2.0"
+alloc-cortex-m = "0.4.1"
+bech32 = { path="../", default-features = false }
+
+[[bin]]
+name = "embedded"
+test = false
+bench = false
+
+[profile.release]
+codegen-units = 1 # better optimizations
+debug = true # symbols are nice and they don't increase the size on Flash
+lto = true # better optimizations

embedded/memory.x

@@ -0,0 +1,6 @@
+MEMORY
+{
+
+  FLASH : ORIGIN = 0x00000000, LENGTH = 256K
+  RAM : ORIGIN = 0x20000000, LENGTH = 64K
+}

embedded/src/main.rs

@@ -0,0 +1,58 @@
+#![feature(alloc_error_handler)]
+#![no_main]
+#![no_std]
+
+extern crate alloc;
+use panic_halt as _;
+
+use self::alloc::string::ToString;
+use self::alloc::vec;
+use self::alloc::vec::Vec;
+use core::alloc::Layout;
+
+use alloc_cortex_m::CortexMHeap;
+use bech32::{self, FromBase32, ToBase32, Variant};
+use cortex_m::asm;
+use cortex_m_rt::entry;
+use cortex_m_semihosting::{debug, hprintln};
+
+#[global_allocator]
+static ALLOCATOR: CortexMHeap = CortexMHeap::empty();
+
+const HEAP_SIZE: usize = 1024; // in bytes
+
+#[entry]
+fn main() -> ! {
+    // Initialize the allocator BEFORE you use it
+    unsafe { ALLOCATOR.init(cortex_m_rt::heap_start() as usize, HEAP_SIZE) }
+
+    let encoded = bech32::encode(
+        "bech32",
+        vec![0x00, 0x01, 0x02].to_base32(),
+        Variant::Bech32,
+    )
+    .unwrap();
+    assert_eq!(encoded, "bech321qqqsyrhqy2a".to_string());
+
+    hprintln!("{}", encoded).unwrap();
+
+    let (hrp, data, variant) = bech32::decode(&encoded).unwrap();
+    assert_eq!(hrp, "bech32");
+    assert_eq!(
+        Vec::<u8>::from_base32(&data).unwrap(),
+        vec![0x00, 0x01, 0x02]
+    );
+    assert_eq!(variant, Variant::Bech32);
+
+    debug::exit(debug::EXIT_SUCCESS);
+
+    loop {}
+}
+
+// define what happens in an Out Of Memory (OOM) condition
+#[alloc_error_handler]
+fn alloc_error(_layout: Layout) -> ! {
+    asm::bkpt();
+
+    loop {}
+}