132 lines
6.4 KiB
Python
132 lines
6.4 KiB
Python
# Демонстрационная модель шины и устройств для интерфейса без оборудования. Синтетические
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# ответы служат проверке пользовательского сценария; они не являются измерениями физической
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# линии.
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"""@file bus_demo.py
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@brief Генератор трафика полевой шины: разбор проверяется без железа.
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Повторяет то, что мост выдаёт в RS485: готовые транспортные кадры со
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всеми типами сообщений ProtoCAN. Модуль не импортирует Qt — планировщик
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живёт во вкладке, а сам генератор проверяется host-тестами.
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"""
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from __future__ import annotations
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import random
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import math
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from datetime import datetime
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from . import can_transport as tr
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from protocan import protocan as pc
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from protocan.gas_167 import REGISTERS
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#: Типы сообщений, которые генератор выдаёт по кругу случайно.
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KINDS = ("pulse", "analog", "modbus", "gas", "status", "error", "discrete")
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class UmpDemoSource:
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"""Two simulated UMP nodes using the assigned global GAS map.
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Call next_frames every 250 ms: four words per node per tick and a
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heartbeat every second. Device Type=3, Device=5/6 are demo addresses,
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not discovery results or a claim about firmware 167/v1 support.
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"""
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def __init__(self) -> None:
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self._tick = 0
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self._seq = 0
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def _frame(self, node: int, kind: int, body: int, data: bytes) -> bytes:
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self._seq = (self._seq + 1) & 0xFF
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identifier = pc.ProtoCanId.build(1, 1, 3, node, kind, body)
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return tr.Frame(seq=self._seq, flags=tr.FLAG_IDE,
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can_id=identifier, data=data).encode()
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def next_frames(self) -> list[bytes]:
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"""Return encoded bridge frames; one full map takes eight seconds."""
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packets = []
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# Show LOAD state immediately, then walk the entire dictionary.
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start = (124 + self._tick * 4) % len(REGISTERS)
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for node, key in ((5, "ump1_id"), (6, "ump2_id")):
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if self._tick % 4 == 0:
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packets.append(self._frame(
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node, pc.MsgType.PULSE, 0,
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bytes([(self._tick // 4) & 0xFF])))
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values = []
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for entry in REGISTERS[start:start + 4]:
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offset = entry["modbus"]
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value = int(2000 + 700 * math.sin(self._tick / 12 + offset / 8 + node))
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command = 0x80 if (self._tick // 32) % 2 == 0 else 0x40
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value = {82: 1000, 124: 8, 125: 0, 126: node, 127: command}.get(offset, value)
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values.append(value.to_bytes(2, "little"))
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packets.append(self._frame(
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node, pc.MsgType.GENERAL_ADDRESS_SPACE,
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REGISTERS[start][key], b"".join(values)))
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self._tick += 1
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return packets
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class BusDemoSource:
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"""@brief Источник демонстрационных кадров шины.
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@param rng Источник случайности; передаётся в тестах для повторяемости.
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"""
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def __init__(self, rng: random.Random | None = None) -> None:
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self._rng = rng or random.Random()
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self._seq = 0
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def next_frame(self) -> bytes:
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"""@brief Собирает очередной кадр так же, как его отдал бы мост.
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@return Готовые байты транспортного кадра, включая SOF и CRC.
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"""
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self._seq = (self._seq + 1) & 0xFF
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kind = self._rng.choice(KINDS)
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dev_type, dev_id = 1, 2
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if kind == "pulse":
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cid = pc.ProtoCanId.build(1, 1, dev_type, dev_id, pc.MsgType.PULSE, 0)
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data = bytes([self._seq])
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elif kind == "analog":
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sid = self._rng.randint(1, 40)
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atype = self._rng.choice([pc.AnalogType.U, pc.AnalogType.I, pc.AnalogType.T])
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cid = pc.ProtoCanId.build(0, 1, dev_type, dev_id, pc.MsgType.ANALOG,
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pc.merge_analog(atype, sid))
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tag = {pc.AnalogType.U: b"US", pc.AnalogType.I: b"IS",
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pc.AnalogType.T: b"TS"}[atype]
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data = tag + ("%04d" % sid).encode()
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elif kind == "modbus":
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adr, cnt = self._rng.randint(0, 0x200), self._rng.randint(1, 4)
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cid = pc.ProtoCanId.build(0, 1, dev_type, dev_id, pc.MsgType.MODBUS_HOLDING,
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pc.merge_modbus(adr, cnt))
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data = b"".join(self._rng.randint(0, 0xFFFF).to_bytes(2, "little")
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for _ in range(cnt))
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elif kind == "gas":
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# Exercise the shared named map in the ordinary demo too.
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dev_type, dev_id = 3, self._rng.choice((5, 6))
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key = "ump1_id" if dev_id == 5 else "ump2_id"
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count = self._rng.randint(1, 4)
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adr = REGISTERS[self._rng.randrange(len(REGISTERS) - count + 1)][key]
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cid = pc.ProtoCanId.build(0, 1, dev_type, dev_id,
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pc.MsgType.GENERAL_ADDRESS_SPACE, adr)
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data = b"".join(self._rng.randint(0, 0xFFFF).to_bytes(2, "little")
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for _ in range(count))
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elif kind == "status":
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now = datetime.now()
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cid = pc.ProtoCanId.build(1, 1, dev_type, dev_id, pc.MsgType.BROADCAST,
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pc.merge_broadcast(pc.BroadcastType.STATUS, 0))
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data = bytes([now.hour, now.minute, now.second, now.year % 100,
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now.month, now.day, now.isoweekday() % 7])
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elif kind == "error":
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cid = pc.ProtoCanId.build(0, 1, dev_type, dev_id, pc.MsgType.ERROR,
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pc.merge_error(self._rng.randint(0, 5), 0xFF))
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data = b""
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else:
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dtype = self._rng.choice(list(pc.DiscreteType)[:7])
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cid = pc.ProtoCanId.build(0, 1, dev_type, dev_id, pc.MsgType.DISCRETE,
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pc.merge_discrete(dtype, self._rng.randint(0, 20)))
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data = bytes(self._rng.randint(0, 255)
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for _ in range(self._rng.randint(1, 8)))
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return tr.Frame(seq=self._seq, flags=tr.FLAG_IDE, can_id=cid,
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data=data).encode()
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