cheng
67 lines
1.8 KiB
Python
67 lines
1.8 KiB
Python
"""伺服和 flexiv_hardware 之间的 MoveL 交接。
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两边不在一个进程里，硬件接口也没有自己的 ROS 节点。用三个文件：
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* ``/tmp/flexiv_movel_req`` 一行 ``seq x y z keep_z vel``
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* ``/tmp/flexiv_movel_ack`` 硬件接住请求后立刻写序号
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* ``/tmp/flexiv_movel_done`` 一行 ``seq ok`` 或 ``seq fail 原因``
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先写临时文件再改名，避免对面读到半行。
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"""
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from __future__ import annotations
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from pathlib import Path
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REQ = Path("/tmp/flexiv_movel_req")
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ACK = Path("/tmp/flexiv_movel_ack")
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DONE = Path("/tmp/flexiv_movel_done")
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def format_request(seq: int, x: float, y: float, z: float, keep_z: bool, vel: float) -> str:
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return (
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f"{int(seq)} {float(x):.6f} {float(y):.6f} {float(z):.6f} "
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f"{1 if keep_z else 0} {float(vel):.4f}\n"
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)
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def write_request(seq: int, x: float, y: float, z: float, keep_z: bool, vel: float) -> None:
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text = format_request(seq, x, y, z, keep_z, vel)
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tmp = REQ.with_name(REQ.name + ".tmp")
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tmp.write_text(text, encoding="utf-8")
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tmp.replace(REQ)
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def parse_done(text: str):
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"""返回 ``(seq, ok, detail)``。行不完整时返回 None。"""
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parts = text.strip().split(maxsplit=2)
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if len(parts) < 2:
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return None
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try:
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seq = int(parts[0])
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except ValueError:
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return None
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if parts[1] not in ("ok", "fail"):
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return None
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detail = parts[2] if len(parts) > 2 else ""
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return seq, parts[1] == "ok", detail
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def read_done():
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try:
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text = DONE.read_text(encoding="utf-8")
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except OSError:
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return None
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return parse_done(text)
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def read_ack() -> int:
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try:
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text = ACK.read_text(encoding="utf-8").strip()
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except OSError:
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return -1
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try:
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return int(text.split()[0])
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except (ValueError, IndexError):
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return -1
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