Python first version

implementation of the python program, with parser and crc verification

bench-data-connector/src/bench_data_connector/__init__.py

@@ -0,0 +1,73 @@
+from serial.tools import list_ports
+from serial import Serial
+import struct
+
+def main() -> None:
+    try:
+        print("Hello from bench-data-connector!")
+        choice = None
+        ports = list(list_ports.comports())
+        for index, port in enumerate(ports):
+            print(f"{index}: {port.device} {port.description}")
+        try:
+            choice = int(input("Choose a port to connect: "))
+        except ValueError:
+             pass
+
+        while choice is None or choice >= len(ports):
+
+            try:
+                choice = int(input("Unknown port. Try again : "))
+            except ValueError:
+                pass
+
+
+        selected_port = ports[choice].device
+        print(f"Selected port : {selected_port}")
+    except KeyboardInterrupt:
+        print("\n")
+        exit(0)
+
+    with Serial(selected_port,baudrate=115200,timeout=1) as ser:
+        while True:
+            start_sync(ser)
+            print("paquet trouvé")
+            payload = ser.read(9) # 9 corresponds to the payload size of the data frame
+            if not payload:
+                continue
+            crc = ser.read(2)
+            if not crc:
+                continue
+            received_crc = struct.unpack("<H", crc)[0]
+            calculated_crc = crc16_ccitt(payload)
+            if calculated_crc != received_crc:
+                continue
+            print("paquet sécurisé")
+
+def crc16_ccitt(data: bytes) -> int:
+    crc = 0xFFFF
+
+    for byte in data:
+        crc ^= byte << 8
+
+        for _ in range(8):
+            if crc & 0x8000:
+                crc = (crc << 1) ^ 0x1021
+            else:
+                crc <<= 1
+
+            crc &= 0xFFFF
+
+    return crc 
+
+
+def start_sync(ser: Serial) -> None:
+    previous = None
+    while True:
+        byte = ser.read(1)
+        if not byte :
+            continue
+        if previous == b"\xEF" and byte == b"\xBE" :
+            return
+        previous = byte
+