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"""
core/acquisition.py
Background acquisition engine. Polls all connected devices at
their configured sample rates and emits data via Qt signals.
"""
import time
import threading
import csv
import os
from collections import deque
from datetime import datetime
from typing import Callable, Dict, List, Optional, Tuple
from PyQt6.QtCore import QObject, pyqtSignal
from devices.base_device import BaseDevice, DeviceStatus
MAX_BUFFER = 10_000 # points per channel
class ChannelBuffer:
"""Ring buffer for one channel's time-series data."""
def __init__(self, maxlen: int = MAX_BUFFER):
self.times: deque = deque(maxlen=maxlen)
self.values: deque = deque(maxlen=maxlen)
def append(self, t: float, v: float):
self.times.append(t)
self.values.append(v)
def latest(self, n: int = 1) -> Tuple[List[float], List[float]]:
ts = list(self.times)[-n:]
vs = list(self.values)[-n:]
return ts, vs
def all(self) -> Tuple[List[float], List[float]]:
return list(self.times), list(self.values)
def clear(self):
self.times.clear()
self.values.clear()
def __len__(self):
return len(self.times)
class AcquisitionEngine(QObject):
"""
Runs a background polling thread for all registered devices.
Signals:
new_data(device_id, channel_id, timestamp, value)
alarm_triggered(device_id, channel_id, value, kind) kind = 'low'|'high'
device_status_changed(device_id, status_str)
log_written(filepath)
"""
new_data = pyqtSignal(str, str, float, float)
alarm_triggered = pyqtSignal(str, str, float, str)
device_status_changed = pyqtSignal(str, str)
log_written = pyqtSignal(str)
def __init__(self, poll_interval_ms: int = 100):
super().__init__()
self.poll_interval_s = poll_interval_ms / 1000.0
self._devices: List[BaseDevice] = []
self._buffers: Dict[str, Dict[str, ChannelBuffer]] = {}
self._running = False
self._thread: Optional[threading.Thread] = None
self._start_time = 0.0
# Logging
self._logging = False
self._log_file: Optional[str] = None
self._csv_writer = None
self._csv_handle = None
# Alarm state (prevent repeated triggers)
self._alarm_active: Dict[str, bool] = {}
# ------------------------------------------------------------------ #
# Device management #
# ------------------------------------------------------------------ #
def add_device(self, device: BaseDevice) -> None:
self._devices.append(device)
self._buffers[device.info.device_id] = {
ch.channel_id: ChannelBuffer()
for ch in device.info.channels
}
def remove_device(self, device_id: str) -> None:
self._devices = [d for d in self._devices if d.info.device_id != device_id]
self._buffers.pop(device_id, None)
def get_buffer(self, device_id: str, channel_id: str) -> Optional[ChannelBuffer]:
return self._buffers.get(device_id, {}).get(channel_id)
# ------------------------------------------------------------------ #
# Start / Stop #
# ------------------------------------------------------------------ #
def start(self) -> None:
if self._running:
return
self._running = True
self._start_time = time.time()
self._thread = threading.Thread(target=self._loop, daemon=True)
self._thread.start()
def stop(self) -> None:
self._running = False
if self._thread:
self._thread.join(timeout=2.0)
self.stop_logging()
# ------------------------------------------------------------------ #
# Logging #
# ------------------------------------------------------------------ #
def start_logging(self, filepath: Optional[str] = None) -> str:
if filepath is None:
ts = datetime.now().strftime("%Y%m%d_%H%M%S")
os.makedirs("logs", exist_ok=True)
filepath = f"logs/daq_{ts}.csv"
self._log_file = filepath
self._csv_handle = open(filepath, "w", newline="")
# Build header
headers = ["timestamp"]
for dev in self._devices:
for ch in dev.info.channels:
headers.append(f"{dev.info.device_id}.{ch.channel_id}")
self._csv_writer = csv.writer(self._csv_handle)
self._csv_writer.writerow(headers)
self._logging = True
return filepath
def stop_logging(self) -> None:
self._logging = False
if self._csv_handle:
try:
self._csv_handle.close()
except Exception:
pass
self._csv_handle = None
self._csv_writer = None
# ------------------------------------------------------------------ #
# Background loop #
# ------------------------------------------------------------------ #
def _loop(self) -> None:
while self._running:
t0 = time.time()
timestamp = t0 - self._start_time
log_row = [f"{timestamp:.3f}"]
for dev in self._devices:
if dev.status not in (DeviceStatus.CONNECTED, DeviceStatus.SIMULATED):
for ch in dev.info.channels:
log_row.append("")
continue
try:
readings = dev.read_channels()
except Exception as e:
print(f"[Acq] Error reading {dev.info.device_id}: {e}")
readings = {}
for ch in dev.info.channels:
val = readings.get(ch.channel_id)
if val is None:
log_row.append("")
continue
# Buffer
buf = self._buffers.get(dev.info.device_id, {}).get(ch.channel_id)
if buf is not None:
buf.append(timestamp, val)
# Signal (emit on main thread via Qt queued connection)
self.new_data.emit(dev.info.device_id, ch.channel_id, timestamp, val)
log_row.append(f"{val:.4f}")
# Alarms
self._check_alarm(dev.info.device_id, ch, val)
if self._logging and self._csv_writer:
try:
self._csv_writer.writerow(log_row)
except Exception:
pass
elapsed = time.time() - t0
sleep_t = self.poll_interval_s - elapsed
if sleep_t > 0:
time.sleep(sleep_t)
def _check_alarm(self, device_id: str, ch, val: float) -> None:
key_lo = f"{device_id}.{ch.channel_id}.low"
key_hi = f"{device_id}.{ch.channel_id}.high"
if ch.alarm_low is not None:
if val < ch.alarm_low and not self._alarm_active.get(key_lo):
self._alarm_active[key_lo] = True
self.alarm_triggered.emit(device_id, ch.channel_id, val, "low")
elif val >= ch.alarm_low:
self._alarm_active[key_lo] = False
if ch.alarm_high is not None:
if val > ch.alarm_high and not self._alarm_active.get(key_hi):
self._alarm_active[key_hi] = True
self.alarm_triggered.emit(device_id, ch.channel_id, val, "high")
elif val <= ch.alarm_high:
self._alarm_active[key_hi] = False
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