Semaine 6 init

Semaine_6/UART_ULTRASON_COMMANDS/tests/Python/ultrason_command.py

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+import serial
+import time
+import struct
+
+# === Paramètres de communication ===
+SERIAL_PORT = "COM6"  # Modifie selon ton système, ex. "/dev/ttyUSB0" sur Linux
+BAUDRATE = 115200     # Change si différent
+TIMEOUT = 2           # secondes
+
+# === Commandes (doivent correspondre aux valeurs Verilog) ===
+CMD_STOP = 3
+CMD_ONE = 1
+CMD_CONTINUOUS = 2
+
+def send_command(ser, command):
+    """Envoie une commande au FPGA"""
+    ser.write(bytes([command]))
+
+def read_distance(ser):
+    """Lit 2 octets et les convertit en distance (int16)"""
+    data = ser.read(2)
+    if len(data) != 2:
+        return None
+    # Interprétation little-endian (LSB, MSB)
+    lsb, msb = data[0], data[1]
+    distance = msb << 8 | lsb
+    return distance
+
+def main():
+    with serial.Serial(SERIAL_PORT, BAUDRATE, timeout=TIMEOUT) as ser:
+        print("Connexion ouverte sur", SERIAL_PORT)
+
+        mode = input("Mode (one / continuous / stop) ? ").strip().lower()
+
+        if mode == "one":
+            send_command(ser, CMD_ONE)
+            print("Mesure unique demandée. Attente résultat...")
+            time.sleep(0.05)
+            distance = read_distance(ser)
+            if distance is not None:
+                print(f"Distance mesurée : {distance} cm")
+            else:
+                print("Erreur : distance non reçue.")
+
+        elif mode == "continuous":
+            send_command(ser, CMD_CONTINUOUS)
+            print("Mesures continues (CTRL+C pour stopper) :")
+            try:
+                while True:
+                    distance = read_distance(ser)
+                    if distance is not None:
+                        print(f"Distance : {distance} cm")
+                    else:
+                        print("... (aucune donnée reçue)")
+                    time.sleep(0.1)
+            except KeyboardInterrupt:
+                send_command(ser, CMD_STOP)
+                print("\nMesure continue arrêtée.")
+
+        elif mode == "stop":
+            send_command(ser, CMD_STOP)
+            print("Commande STOP envoyée.")
+
+        else:
+            print("Commande invalide.")
+
+if __name__ == "__main__":
+    main()