scons: _check_ftdi(): refactor

apio/managers/scons.py

@@ -675,12 +675,17 @@ def _check_ftdi(board, board_data, ext_ftdi_id):
         desc_pattern = f"^{board_desc}.*$"
 
         # Match the discovered FTDI chips
-        ftdi_devices = System().get_ftdi_devices()
 
-        if len(ftdi_devices) == 0:
+        # -- Get the list of the connected FTDI devices
+        # -- (execute the command "lsftdi" from the apio System module)
+        system = System()
+        connected_devices = system.get_ftdi_devices()
+
+        if len(connected_devices) == 0:
             # Board not available
             raise AttributeError("board " + board + " not available")
-        for ftdi_device in ftdi_devices:
+
+        for ftdi_device in connected_devices:
             index = ftdi_device.get("index")
             # ftdi device indices can start at zero
             if ext_ftdi_id is not None and ext_ftdi_id != index:

apio/managers/system.py

@@ -123,7 +123,7 @@ def get_ftdi_devices(self) -> list:
          This list is obtained by running the "lsftdi" command
 
          * OUTPUT:  A list of objects with the FTDI devices
-        Ex. [{'index': '0', 'manufacturer': 'AlhambraBits', 
+        Ex. [{'index': '0', 'manufacturer': 'AlhambraBits',
               'description': 'Alhambra II v1.0A - B07-095'}]
 
         It raises an exception in case of not being able to
@@ -141,7 +141,7 @@ def get_ftdi_devices(self) -> list:
 
             # -- Get the list of the ftdi devices. It is read
             # -- from the command stdout
-            # -- Ex: [{'index': '0', 'manufacturer': 'AlhambraBits', 
+            # -- Ex: [{'index': '0', 'manufacturer': 'AlhambraBits',
             # --      'description': 'Alhambra II v1.0A - B07-095'}]
             ftdi_devices = self._parse_ftdi_devices(result["out"])
 
@@ -152,7 +152,6 @@ def get_ftdi_devices(self) -> list:
         # -- for reading the ftdi devices
         raise RuntimeError("Error executing lsftdi")
 
-
     def _run_command(self, command: str, silent=False) -> dict:
         """Execute the given system command
         * INPUT: