add test

hil_lib.py

@@ -0,0 +1,61 @@
+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
+        self.target = serial.Serial(target_port, 115200, timeout=0.1)
+        
+    def calculate_scd30_crc(self, data):
+        crc = 0xFF
+        for byte in data:
+            crc ^= byte
+            for _ in range(8):
+                if crc & 0x80:
+                    crc = (crc << 1) ^ 0x31
+                else:
+                    crc <<= 1
+                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 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
+        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
+        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 close(self):
+        self.emulator.close()
+        self.target.close()