Add some additional notes.

README.md

@@ -3,7 +3,13 @@
 This repository shows how to compile a Rust application which runs on the
 ThreadX RTOS.
 
+Note this project uses Git submodules, so you should run:
+
+```bash
+git submodule update --init
+```
+
 ## Licence
 
-* Copyright (c) 2023 Ferrous Systems
+* Copyright (c) 2024 Ferrous Systems
 * SPDX-License-Identifier: MIT OR Apache-2.0

demo-app/README.md

@@ -0,0 +1,50 @@
+# Rust on ThreadX on nRF52 Example Binary
+
+This is a Rust application which uses ThreadX and runs on an nRF52840-DK board.
+
+You can compile it with Rust, or with Ferrocene. You will need
+`arm-none-eabi-gcc` installed to compile ThreadX, which this application does
+automatically. You will also need `probe-rs` from <https://probe.rs>.
+
+```console
+$ cargo run --release
+   Compiling demo-app v0.0.0 (/Users/jonathan/Documents/ferrous-systems/threadx-experiments/demo-app)
+    Finished `dev` profile [optimized + debuginfo] target(s) in 4.81s
+     Running `probe-rs run --chip nRF52840_xxAA target/thumbv7em-none-eabi/debug/demo-app`
+      Erasing ✔ [00:00:00] [####################################] 12.00 KiB/12.00 KiB @ 33.03 KiB/s (eta 0s )
+  Programming ✔ [00:00:00] [####################################] 12.00 KiB/12.00 KiB @ 42.84 KiB/s (eta 0s )    Finished in 0.661s
+<lvl> Hello, this is version unknown!
+└─ demo_app::__cortex_m_rt_main @ src/main.rs:151
+<lvl> Entering ThreadX kernel...
+└─ demo_app::__cortex_m_rt_main @ src/main.rs:186
+<lvl> In tx_application_define()...
+└─ demo_app::tx_application_define @ src/main.rs:26
+<lvl> Stack allocated @ 0x20037444
+└─ demo_app::tx_application_define @ src/main.rs:59
+<lvl> Thread spawned (entry=12345678) @ 0x2003f440
+└─ demo_app::tx_application_define @ src/main.rs:85
+<lvl> Stack allocated @ 0x2003944c
+└─ demo_app::tx_application_define @ src/main.rs:102
+<lvl> Thread spawned (entry=aabbccdd) @ 0x2003f4f8
+└─ demo_app::tx_application_define @ src/main.rs:128
+<lvl> I am my_thread(12345678)
+└─ demo_app::my_thread @ src/main.rs:136
+<lvl> I am my_thread(aabbccdd)
+└─ demo_app::my_thread @ src/main.rs:136
+<lvl> I am my_thread(12345678), count = 1
+└─ demo_app::my_thread @ src/main.rs:145
+<lvl> I am my_thread(aabbccdd), count = 1
+└─ demo_app::my_thread @ src/main.rs:145
+<lvl> I am my_thread(12345678), count = 2
+└─ demo_app::my_thread @ src/main.rs:145
+<lvl> I am my_thread(aabbccdd), count = 2
+└─ demo_app::my_thread @ src/main.rs:145
+<lvl> I am my_thread(12345678), count = 3
+└─ demo_app::my_thread @ src/main.rs:145
+...
+```
+
+## Licence
+
+* Copyright (c) 2024 Ferrous Systems
+* SPDX-License-Identifier: MIT OR Apache-2.0