feat: complete assembly mesh relay control path

- synchronize STM8 application and external flash layout updates\n- add assembly bootloader and assembly application test projects\n- add UART1 interrupt receive ring buffer\n- parse JDY-28M Mesh outer frames and source addresses\n- add CRC-16/MODBUS validation\n- implement relay control command 0x01 and response 0x81\n- support unicast and broadcast relay control frames\n- update host protocol, OTA documents, and serial tools

tools/merge_intel_hex.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+"""合并Bootloader和主程序的Intel HEX文件。"""
+
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+EOF_RECORD = ":00000001FF"
+
+
+def read_records(path: Path) -> list[str]:
+    """读取HEX记录，并去掉输入文件末尾的EOF记录。"""
+    records = []
+    for raw_line in path.read_text(encoding="ascii").splitlines():
+        line = raw_line.strip().upper()
+        if not line:
+            continue
+        if not line.startswith(":"):
+            raise ValueError(f"{path}包含非法HEX记录：{line}")
+        if line != EOF_RECORD:
+            records.append(line)
+    return records
+
+
+def record_range(record: str) -> tuple[int, int] | None:
+    """返回数据记录地址范围，用于检查两个镜像是否重叠。"""
+    count = int(record[1:3], 16)
+    record_type = int(record[7:9], 16)
+    if record_type != 0x00 or count == 0:
+        return None
+    address = int(record[3:7], 16)
+    return address, address + count
+
+
+def merge(output: Path, inputs: list[Path]) -> None:
+    """合并绝对地址HEX文件，并检查数据区间重叠。"""
+    occupied: list[tuple[int, int, Path]] = []
+    records: list[str] = []
+    for path in inputs:
+        for record in read_records(path):
+            current = record_range(record)
+            if current is not None:
+                start, end = current
+                for old_start, old_end, old_path in occupied:
+                    if start < old_end and old_start < end:
+                        raise ValueError(
+                            f"HEX地址重叠：{path} 0x{start:04X}~0x{end - 1:04X}，"
+                            f"与 {old_path} 冲突"
+                        )
+                occupied.append((start, end, path))
+            records.append(record)
+    output.write_text("\n".join(records + [EOF_RECORD]) + "\n", encoding="ascii")
+
+
+def main() -> None:
+    """解析参数并执行HEX合并。"""
+    parser = argparse.ArgumentParser(description="合并STM8 Bootloader和主程序HEX")
+    parser.add_argument("output", type=Path, help="输出HEX文件")
+    parser.add_argument("inputs", nargs="+", type=Path, help="输入HEX文件")
+    args = parser.parse_args()
+    merge(args.output, args.inputs)
+
+
+if __name__ == "__main__":
+    main()