Add initial version of the DAL programme.

.gitignore

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+yotta_targets/*
+yotta_modules/*
+build/*
+*.hex
+*.bin
+*.DS_Store

.yotta.json

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+{
+  "build": {
+    "target": "bbc-microbit-classic-gcc,https://github.com/lancaster-university/yotta-target-bbc-microbit-classic-gcc"
+  }
+}

README.md

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-# incompatible-error-programme
-A simple BLE-enabled CODAL programme that scrolls error 927 (programme not compatible)
+# Incompatible V1 Error Programme
+
+A simple BLE-enabled DAL programme for micro:bit V1 that scrolls error code
+927 on the display.
+
+This programme is meant to be used with the
+[Universal Hex Creator Tool](https://tech.microbit.org/software/universal-hex-creator/)
+to include a micro:bit V1 hex file that scrolls the "not compatible" error code
+for V2-only programmes.
+
+## Dependencies
+
+- [GNU Arm Embedded Toolchain](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads)
+- [Git](https://git-scm.com)
+- [CMake](https://cmake.org/download/)
+- [Python 3](https://www.python.org/downloads/)
+- [Ninja](https://ninja-build.org/)
+- [Yotta](https://yottabuild.org/)
+
+Or Docker.
+
+## Build Instructions
+
+```
+yotta build
+```
+
+```
+docker run -v $(pwd):/home --rm ghcr.io/carlosperate/microbit-toolchain:latest yotta build
+```

config.json

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+{
+    "microbit-dal": {
+        "bluetooth": {
+            "enabled": 1,
+            "pairing_mode": 1,
+            "private_addressing": 0,
+            "open": 0,
+            "whitelist": 1,
+            "advertising_timeout": 0,
+            "tx_power": 6,
+            "security_level": "SECURITY_MODE_ENCRYPTION_NO_MITM",
+            "event_service": 0,
+            "dfu_service": 1,
+            "partial_flashing": 1,
+            "device_info_service": 1
+        }
+    }
+}

module.json

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+{
+  "name": "error-programme",
+  "version": "1.0.0",
+  "description": "The micro:bit runtime common abstraction with examples.",
+  "license": "MIT",
+  "dependencies": {
+    "microbit": "lancaster-university/microbit#v2.1.1"
+  },
+  "targetDependencies": {},
+  "bin": "./src"
+}

src/main.cpp

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+#include "MicroBit.h"
+
+MicroBit uBit;
+
+const uint8_t error_face_[] {
+    1, 1, 0, 1, 1,
+    1, 1, 0, 1, 1,
+    0, 0, 0, 0, 0,
+    0, 1, 1, 1, 0,
+    1, 0, 0, 0, 1,
+};
+const MicroBitImage error_face(5, 5, error_face_);
+
+int main() {
+    uBit.init();
+
+    while (true) {
+        uBit.display.print(error_face);
+        uBit.sleep(1000);
+        uBit.display.print("927");
+    }
+}