new discovery phase
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Aiden
278
scripts/serial_primer_candidate_sweep.py
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278
scripts/serial_primer_candidate_sweep.py
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#!/usr/bin/env python3
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"""Sweep RCP-TX7 primer -> candidate query pairs.
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The current working model is that a valid host frame primes the RCP and the next
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host frame selects a status/query response. This helper sends one primer frame
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followed by one candidate frame and classifies raw pin-4 RX against the known
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heartbeat stream.
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Use --prompt-power-cycle for clean mapping: power-cycle the RCP before each
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candidate, press Enter, then the script sends exactly one primer/candidate pair.
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"""
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from __future__ import annotations
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import argparse
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import datetime as dt
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import sys
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import time
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try:
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import serial
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except ImportError:
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print(
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"Missing dependency: pyserial\n"
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"Install it with: python -m pip install pyserial",
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file=sys.stderr,
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)
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raise SystemExit(2)
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HEARTBEAT = bytes.fromhex("00 00 00 00 80 DA")
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def parse_byte(text: str) -> int:
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value = int(text, 0)
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if not 0 <= value <= 0xFF:
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raise argparse.ArgumentTypeError(f"must be a byte: {text}")
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return value
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def parse_byte_set(text: str) -> list[int]:
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values: list[int] = []
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for part in text.replace(",", " ").split():
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if "-" in part:
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start_text, end_text = part.split("-", 1)
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start = parse_byte(start_text)
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end = parse_byte(end_text)
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if end < start:
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raise argparse.ArgumentTypeError(f"bad range: {part}")
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values.extend(range(start, end + 1))
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else:
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values.append(parse_byte(part))
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if not values:
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raise argparse.ArgumentTypeError("empty byte set")
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return list(dict.fromkeys(values))
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def build_frame(prefix1: int, prefix2: int, command: int, state: int, value: int) -> bytes:
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body = bytes([prefix1, prefix2, command, state, value])
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checksum = 0x5A
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for byte in body:
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checksum ^= byte
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return body + bytes([checksum])
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def hex_preview(data: bytes) -> str:
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return " ".join(f"{byte:02X}" for byte in data)
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def make_logger(path: str | None):
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log_file = open(path, "a", encoding="utf-8") if path else None
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def emit(line: str) -> None:
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print(line)
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if log_file:
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log_file.write(line + "\n")
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log_file.flush()
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return emit, log_file
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def heartbeat_offset(data: bytes) -> int | None:
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if not data:
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return 0
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for offset in range(len(HEARTBEAT)):
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if all(byte == HEARTBEAT[(offset + index) % len(HEARTBEAT)] for index, byte in enumerate(data)):
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return offset
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return None
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def first_mismatch(data: bytes, offset: int) -> tuple[int, int, int] | None:
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for index, byte in enumerate(data):
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expected = HEARTBEAT[(offset + index) % len(HEARTBEAT)]
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if byte != expected:
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return index, byte, expected
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return None
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def classify_rx(data: bytes) -> tuple[bool, str]:
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if not data:
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return False, "no RX bytes"
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offset = heartbeat_offset(data)
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if offset is not None:
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full = len(data) // len(HEARTBEAT)
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extra = len(data) % len(HEARTBEAT)
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return False, f"heartbeat-compatible RX: {len(data)} bytes, offset {offset}, {full} frames + {extra} bytes"
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best_offset = min(
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range(len(HEARTBEAT)),
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key=lambda candidate: sum(
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byte != HEARTBEAT[(candidate + index) % len(HEARTBEAT)]
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for index, byte in enumerate(data)
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),
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)
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mismatch = first_mismatch(data, best_offset)
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if mismatch is None:
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return False, "heartbeat-compatible RX"
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index, byte, expected = mismatch
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return (
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True,
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f"ANOMALY {len(data)} RX bytes; first mismatch at byte {index}: "
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f"got {byte:02X}, heartbeat offset {best_offset} expected {expected:02X}",
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)
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def read_window(ser: serial.Serial, duration: float) -> bytes:
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stop_at = time.monotonic() + duration
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data = bytearray()
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while time.monotonic() < stop_at:
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chunk = ser.read(128)
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if chunk:
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data.extend(chunk)
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return bytes(data)
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def parse_args() -> argparse.Namespace:
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parser = argparse.ArgumentParser(
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description="Sweep primer->candidate pairs and log non-heartbeat raw RX."
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)
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parser.add_argument("--port", required=True, help="serial port, for example COM5")
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parser.add_argument("--baud", type=int, default=38400)
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parser.add_argument("--prefix1", type=parse_byte, default=0x00)
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parser.add_argument("--prefix2", type=parse_byte, default=0x00)
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parser.add_argument("--primer-command", type=parse_byte, default=0x00)
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parser.add_argument("--primer-state", type=parse_byte, default=0x00)
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parser.add_argument("--primer-value", type=parse_byte, default=0x80)
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parser.add_argument("--candidates", type=parse_byte_set, required=True)
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parser.add_argument("--candidate-state", type=parse_byte, default=0x00)
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parser.add_argument("--candidate-value", type=parse_byte, default=0x80)
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parser.add_argument("--settle", type=float, default=3.0)
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parser.add_argument("--between", type=float, default=0.6)
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parser.add_argument("--after", type=float, default=1.5)
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parser.add_argument("--timeout", type=float, default=0.03)
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parser.add_argument("--log", help="append sweep log to this file")
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parser.add_argument("--dry-run", action="store_true")
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parser.add_argument("--prompt-power-cycle", action="store_true")
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parser.add_argument("--stop-on-anomaly", action="store_true")
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return parser.parse_args()
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def main() -> int:
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args = parse_args()
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primer = build_frame(
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args.prefix1,
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args.prefix2,
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args.primer_command,
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args.primer_state,
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args.primer_value,
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)
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candidates = [
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(
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command,
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build_frame(
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args.prefix1,
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args.prefix2,
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command,
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args.candidate_state,
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args.candidate_value,
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),
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)
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for command in args.candidates
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]
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if args.dry_run:
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print(f"primer cmd 0x{args.primer_command:02X}: {hex_preview(primer)}")
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for command, frame in candidates:
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print(f"candidate 0x{command:02X}: {hex_preview(frame)}")
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return 0
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emit, log_file = make_logger(args.log)
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anomaly_count = 0
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try:
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with serial.Serial(
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port=args.port,
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baudrate=args.baud,
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bytesize=serial.EIGHTBITS,
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parity=serial.PARITY_NONE,
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stopbits=serial.STOPBITS_ONE,
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timeout=args.timeout,
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write_timeout=1.0,
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rtscts=False,
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dsrdtr=False,
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xonxoff=False,
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) as ser:
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emit(
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f"Primer/candidate sweep: primer {hex_preview(primer)}, "
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f"{len(candidates)} candidates on {ser.port} at {ser.baudrate} 8N1"
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)
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for index, (command, candidate) in enumerate(candidates, start=1):
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if args.prompt_power_cycle:
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answer = input(
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f"Power-cycle RCP for candidate 0x{command:02X}, wait for heartbeat, "
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"then press Enter (q then Enter to stop): "
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).strip()
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if answer.lower() in {"q", "quit", "stop"}:
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emit("Stopped before next candidate.")
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break
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ser.reset_input_buffer()
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baseline = read_window(ser, args.settle)
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baseline_anomaly, baseline_note = classify_rx(baseline)
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emit(f"CANDIDATE 0x{command:02X} BASELINE {baseline_note}")
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if baseline_anomaly:
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emit(f"CANDIDATE 0x{command:02X} BASELINE raw {hex_preview(baseline)}")
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stamp = dt.datetime.now().strftime("%H:%M:%S.%f")[:-3]
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emit(f"{stamp} TX primer frame {len(primer):03d} {hex_preview(primer)}")
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ser.write(primer)
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ser.flush()
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primer_rx = read_window(ser, args.between)
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primer_anomaly, primer_note = classify_rx(primer_rx)
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if primer_anomaly:
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anomaly_count += 1
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emit(f"{stamp} PRIMER {primer_note}")
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emit(f"{stamp} PRIMER raw {hex_preview(primer_rx)}")
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if args.stop_on_anomaly:
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emit("Stopping after primer anomaly.")
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break
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stamp = dt.datetime.now().strftime("%H:%M:%S.%f")[:-3]
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emit(
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f"{stamp} TX candidate 0x{command:02X} "
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f"frame {len(candidate):03d} {hex_preview(candidate)}"
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)
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ser.write(candidate)
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ser.flush()
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rx = read_window(ser, args.after)
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is_anomaly, note = classify_rx(rx)
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if is_anomaly:
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anomaly_count += 1
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emit(f"{stamp} CANDIDATE 0x{command:02X} {note}")
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emit(f"{stamp} CANDIDATE 0x{command:02X} raw {hex_preview(rx)}")
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if args.stop_on_anomaly:
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emit("Stopping after candidate anomaly.")
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break
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else:
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emit(f"{stamp} CANDIDATE 0x{command:02X} {note}")
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emit(f"Completed candidate {index}/{len(candidates)}")
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emit(f"Anomalies: {anomaly_count}")
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except KeyboardInterrupt:
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emit("Stopped.")
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return 0
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except serial.SerialException as exc:
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print(f"Serial error: {exc}", file=sys.stderr)
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return 1
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finally:
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if log_file:
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log_file.close()
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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