Talk to Nucleo running babystack-tempsensing

load_controller/gui.py

@@ -1,7 +1,7 @@
 import os.path
 import time
 
-from PySide6.QtCore import QTimer, QObject
+from PySide6.QtCore import QTimer, QObject, Signal
 from PySide6.QtWidgets import QFileDialog
 from PySide6.QtQml import QQmlApplicationEngine
 
@@ -17,7 +17,7 @@ class GUI(QObject):
     _start_pause_btn: QObject
     _stop_btn: QObject
 
-    def __init__(self, profile_handler: ProfileHandler):
+    def __init__(self, profile_handler: ProfileHandler, temperaturesUpdated: Signal):
         super().__init__(None)
 
         self._engine = QQmlApplicationEngine()
@@ -42,6 +42,8 @@ class GUI(QObject):
         self._update_timer.timeout.connect(self._update)
         self._update_timer.start(100)
 
+        temperaturesUpdated.connect(self._updateTemperatures)
+
     def _choose_profile(self):
         dlg = QFileDialog()
         dlg.setFileMode(QFileDialog.FileMode.ExistingFile)
@@ -79,3 +81,7 @@ class GUI(QObject):
         if self._profile_handler.state == ProfileState.RUNNING:
             dt = time.time() - self._profile_handler.profile_start
             self._win.setProperty("profileTime", dt)
+
+    def _updateTemperatures(self, temperatures: list[int]):
+        self._win.setProperty("temp_min", min(temperatures))
+        self._win.setProperty("temp_max", max(temperatures))

load_controller/temperatures.py

@@ -0,0 +1,35 @@
+import sys
+import serial
+import struct
+
+from PySide6.QtCore import QObject, Signal
+
+START_OF_TEMPS = bytes((0xFF, 0xFF))
+N_SENSORS = 12
+TEMP_QUANT = 0.0625  # °C/quant
+
+
+class Temperatures(QObject):
+    temperaturesUpdated = Signal(list)
+
+    _temps: list[float]
+
+    def __init__(self, uart_path: str):
+        super().__init__(parent=None)
+        self.dev = serial.Serial(uart_path, 115200)
+        self._temps = [0.0] * N_SENSORS
+
+    def run(self):
+        while True:
+            self.dev.read_until(START_OF_TEMPS)
+            data = self.dev.read(N_SENSORS * 2)
+            temps = struct.unpack(f">{N_SENSORS}h", data)
+            for i, t in enumerate(temps):
+                if (t & 0x0F) != 0:
+                    print(
+                        f"WARN: temperature had a non-zero least-significant nibble: {t:04x}",
+                        file=sys.stderr,
+                    )
+                else:
+                    self._temps[i] = (t >> 4) * TEMP_QUANT
+            self.temperaturesUpdated.emit(self._temps)