ykcheungab
245 lines
8.8 KiB
Python
245 lines
8.8 KiB
Python
#!/usr/bin/env python3
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"""Headless UART finger service for 1-4 sensors; see ../docs/uart.md.
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The login console and data UART must be separate ports. Cameras are added
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manually via UART before starting output. All force records include a 1-based sensor ID.
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Importing this module opens no devices; acquisition is owned by finger_api.
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"""
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from __future__ import annotations
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import argparse
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import logging
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import math
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import os
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import shlex
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import sys
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from collections import deque
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os.environ.setdefault("OPENCV_VIDEOIO_MSMF_ENABLE_HW_TRANSFORMS", "0")
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from finger_api import FingerSensorBank, parse_source
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logger = logging.getLogger(__name__)
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class UartFingerController:
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"""Single-threaded command service; the caller owns serial and final cleanup."""
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def __init__(
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self, ser, *, config="finger", loop_video=True,
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show=False, verbose=False,
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):
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self.ser = ser
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self.bank = FingerSensorBank(config=config, verbose=verbose)
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self.loop_video = loop_video
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self.show = show
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self.verbose = verbose
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self._streaming = False
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self._should_quit = False
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self._partial = bytearray()
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self._lines = deque()
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self._discard_line = False
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def reply(self, line):
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# SDK exceptions can contain newlines; every reply must be one record.
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text = " ".join(str(line).splitlines()) + "\n"
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data = text.encode("utf-8")
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if self.ser.write(data) != len(data):
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raise OSError("incomplete UART write")
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if self.verbose:
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print(f"<< {text.rstrip()}", file=sys.stderr, flush=True)
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def close_runtime(self):
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self._streaming = False
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try:
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self.bank.close()
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finally:
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if self.show:
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import cv2
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cv2.destroyAllWindows()
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def _poll_command_line(self, *, blocking=True):
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if self._lines:
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return self._lines.popleft()
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waiting = self.ser.in_waiting
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if not waiting and not blocking:
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return None
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# Never readline(): a timeout may return only half of a command.
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raw = self.ser.read(min(waiting, 4096) if waiting else 1)
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for byte in raw:
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if byte in (10, 13):
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if self._discard_line:
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self._discard_line = False
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self._partial.clear()
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self.reply("ERR command line too long (max 1024 bytes)")
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elif self._partial:
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self._lines.append(self._partial.decode("utf-8", errors="replace").strip())
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self._partial.clear()
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elif not self._discard_line:
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self._partial.append(byte)
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if len(self._partial) > 1024:
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self._partial.clear()
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self._discard_line = True
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return self._lines.popleft() if self._lines else None
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def _read_round(self):
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try:
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readings = self.bank.read_all(loop_video=self.loop_video)
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except EOFError as exc:
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self._streaming = False
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self.reply(f"OK eof {exc}")
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return
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except Exception as exc:
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logger.exception("Acquisition round failed")
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self._streaming = False
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self.reply(f"ERR read {exc}")
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return
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for reading in readings:
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self.reply(
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f"force,{reading.sensor_id},{reading.normal:.6f},"
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f"{reading.shear_x:.6f},{reading.shear_y:.6f}"
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)
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if self.show:
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self._show(reading)
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if self._should_quit:
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return
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def _show(self, reading):
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import cv2
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import orisys
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tactile = self.bank.runtimes[reading.sensor_id].tactile
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try:
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arrows = orisys.util.draw_arrows(
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reading.image, tactile.flow, threshold=0.4, grid_spacing=10,
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arrow_scale=1.0, valid_mask=tactile.valid_mask,
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)
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cv2.imshow(f"UV Unrolled {reading.sensor_id}", arrows)
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key = cv2.waitKey(1) & 0xFF
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if key == ord("q"):
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self._streaming = False
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self._should_quit = True
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self.reply("OK quit")
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elif key == ord("r"):
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tactile.reset()
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except Exception:
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logger.exception("Sensor %s display failed", reading.sensor_id)
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def _dispatch(self, line):
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try:
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parts = shlex.split(line)
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except ValueError as exc:
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self.reply(f"ERR command {exc}")
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return True
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if not parts:
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return True
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command = parts[0].lower()
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if command == "add":
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if len(parts) not in (2, 3):
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self.reply("ERR command expected add SOURCE [CONFIG]")
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elif self._streaming:
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self.reply("ERR add stop streaming first")
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else:
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try:
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sensor_id = self.bank.add(
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parse_source(parts[1]), config=parts[2] if len(parts) == 3 else None,
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)
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except Exception as exc:
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logger.exception("Sensor addition failed")
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self.reply(f"ERR add {exc}")
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else:
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self.reply(f"OK added {sensor_id}")
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elif command not in {"start", "stop", "read", "quit"}:
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self.reply(f"ERR unknown {command}")
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elif len(parts) != 1:
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self.reply("ERR command start|stop|read|quit take no arguments")
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elif command == "start":
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if not self.bank.runtimes:
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self.reply("ERR start no sensors added")
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else:
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self._streaming = True
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self.reply("OK start")
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elif command == "stop":
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self._streaming = False
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self.reply("OK stop")
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elif command == "read":
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self._read_round()
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elif command == "quit":
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self._streaming = False
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self._should_quit = True
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self.reply("OK quit")
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return not self._should_quit
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def serve(self):
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self.reply(f"OK ready {len(self.bank.sources)}")
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self._streaming = False
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while not self._should_quit:
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for _ in range(16):
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line = self._poll_command_line(blocking=not self._streaming)
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if line is None:
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break
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if not self._dispatch(line):
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return
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if self._streaming:
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self._read_round()
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def open_serial(port, baud, timeout, write_timeout=1.0):
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try:
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import serial
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except ImportError as exc:
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raise RuntimeError("pyserial is required: python -m pip install pyserial") from exc
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return serial.Serial(
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port=port, baudrate=baud, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE,
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stopbits=serial.STOPBITS_ONE, timeout=timeout, write_timeout=write_timeout,
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exclusive=True,
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)
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def main(argv=None):
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parser = argparse.ArgumentParser(description="Manual UART finger service: add, start, stop, read, quit")
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parser.add_argument("--port", default="/dev/ttyHS1")
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parser.add_argument("--baud", type=int, default=115200)
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parser.add_argument("--timeout", type=float, default=0.1, help="idle read timeout in seconds")
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parser.add_argument("--write-timeout", type=float, default=1.0)
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parser.add_argument("--config", "-c", default="finger", help="default config for add commands")
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parser.add_argument("--no-loop-video", dest="loop_video", action="store_false")
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parser.add_argument("--show", action="store_true", help="local desktop debug only")
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parser.add_argument("--verbose", action="store_true")
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args = parser.parse_args(argv)
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if args.baud <= 0:
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parser.error("baud must be positive")
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if any(not math.isfinite(t) or t <= 0 for t in (args.timeout, args.write_timeout)):
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parser.error("timeouts must be finite and positive")
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controller = UartFingerController(
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None, config=args.config, loop_video=args.loop_video,
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show=args.show, verbose=args.verbose,
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)
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ser = None
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result = 0
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try:
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ser = open_serial(args.port, args.baud, args.timeout, args.write_timeout)
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controller.ser = ser
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print(f"UART service on {args.port} @ {args.baud}; waiting for add SOURCE, then start", file=sys.stderr, flush=True)
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controller.serve()
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except KeyboardInterrupt:
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print("Interrupted.", file=sys.stderr)
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except Exception:
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logger.exception("UART service failed on %s", args.port)
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result = 1
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finally:
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try:
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controller.close_runtime()
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except Exception:
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logger.exception("Runtime cleanup failed")
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result = 1
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finally:
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if ser is not None:
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ser.close()
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return result
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if __name__ == "__main__":
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raise SystemExit(main())
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