Update ports

hil_lib.py

@@ -2,14 +2,15 @@ import serial
 import struct
 import time
 
-class HILController:
-    def __init__(self, emulator_port, target_port, baud=921600):
-        # Port for the ESP32 acting as the Sensor
-        self.emulator = serial.Serial(emulator_port, baud, timeout=0.1)
-        # Port for the ESP32 running your application code
+class SCD30_HIL_Lib:
+    def __init__(self, emulator_port='/dev/i2c_emulator', target_port='/dev/esp_sensor_test', baud=921600):
+        # High speed for the bridge to minimize I2C latency
+        self.emulator = serial.Serial(emulator_port, baud, timeout=0.05)
+        # Standard speed for the Target application logs
         self.target = serial.Serial(target_port, 115200, timeout=0.1)
         
-    def calculate_scd30_crc(self, data):
+    def _calculate_crc8(self, data):
+        """SCD30 specific CRC-8 (Polynomial 0x31)"""
         crc = 0xFF
         for byte in data:
             crc ^= byte
@@ -21,40 +22,38 @@ class HILController:
                 crc &= 0xFF
         return crc
 
-    def pack_float_scd30(self, value):
-        """Packs a float into the SCD30 [MSB, LSB, CRC, MSB, LSB, CRC] format"""
-        b = struct.pack('>f', value)
-        w1 = [b[0], b[1]]
-        w2 = [b[2], b[3]]
-        return w1 + [self.calculate_scd30_crc(w1)] + w2 + [self.calculate_scd30_crc(w2)]
+    def _pack_float(self, value):
+        """Converts float to [MSB, LSB, CRC, MSB2, LSB2, CRC]"""
+        b = struct.pack('>f', value) # Big-endian IEEE754
+        w1, w2 = [b[0], b[1]], [b[2], b[3]]
+        return w1 + [self._calculate_crc8(w1)] + w2 + [self._calculate_crc8(w2)]
 
-    def set_emulator_data(self, co2, temp, hum):
-        """Prepares the DATA: hex string for the Emulator ESP32"""
-        # SCD30 Ready Status (0x0001 + CRC)
-        ready_hex = "000103" 
-        
-        # Build the 18-byte measurement buffer
-        payload = self.pack_float_scd30(co2) + \
-                  self.pack_float_scd30(temp) + \
-                  self.pack_float_scd30(hum)
-        
-        data_hex = "".join(f"{b:02X}" for b in payload)
-        
-        # We check for CMD from emulator and respond
+    def process_bridge(self, co2_val, temp_val, hum_val):
+        """
+        Listens for 'CMD:' from Emulator and replies with 'DATA:'
+        Returns True if a measurement was successfully served.
+        """
         line = self.emulator.readline().decode('utf-8', errors='ignore').strip()
-        if "CMD:0202" in line: # Master asking if data is ready
-            self.emulator.write(f"DATA:{ready_hex}\n".encode())
-        elif "CMD:0300" in line: # Master asking for the 18 bytes
-            self.emulator.write(f"DATA:{data_hex}\n".encode())
-            return True
+        
+        if line.startswith("CMD:"):
+            cmd = line[4:]
+            
+            if "0202" in cmd: # Data Ready Status request
+                resp = [0x00, 0x01, self._calculate_crc8([0x00, 0x01])]
+                self.emulator.write(f"DATA:{''.join(f'{b:02X}' for b in resp)}\n".encode())
+                
+            elif "0300" in cmd: # Read Measurement request
+                payload = self._pack_float(co2_val) + \
+                          self._pack_float(temp_val) + \
+                          self._pack_float(hum_val)
+                hex_data = "".join(f"{b:02X}" for b in payload)
+                self.emulator.write(f"DATA:{hex_data}\n".encode())
+                return True # Measurement cycle complete
         return False
 
-    def read_target_output(self):
-        """Reads the latest print statement from the Test Code ESP32"""
-        line = self.target.readline().decode('utf-8', errors='ignore').strip()
-        if "CO2:" in line:
-            return line
-        return None
+    def get_target_reading(self):
+        """Captures the output from the Target ESP32 Serial Monitor"""
+        return self.target.readline().decode('utf-8', errors='ignore').strip()
 
     def close(self):
         self.emulator.close()