Add build system support for programming ESP32-S2 using DFU utils

tools/idf_py_actions/dfu_ext.py

@@ -0,0 +1,39 @@
+from idf_py_actions.tools import is_target_supported, ensure_build_directory, run_target
+from idf_py_actions.errors import FatalError
+
+
+def action_extensions(base_actions, project_path):
+
+    SUPPORTED_TARGETS = ['esp32s2']
+
+    def dfu_target(target_name, ctx, args):
+        ensure_build_directory(args, ctx.info_name)
+        run_target(target_name, args)
+
+    def dfu_flash_target(target_name, ctx, args):
+        ensure_build_directory(args, ctx.info_name)
+
+        try:
+            run_target(target_name, args)
+        except FatalError:
+            # Cannot capture the error from dfu-util here so the best advise is:
+            print('Please have a look at the "Device Firmware Upgrade through USB" chapter in API Guides of the '
+                  'ESP-IDF documentation for solving common dfu-util issues.')
+            raise
+
+    dfu_actions = {
+        "actions": {
+            "dfu": {
+                "callback": dfu_target,
+                "short_help": "Build the DFU binary",
+                "dependencies": ["all"],
+            },
+            "dfu-flash": {
+                "callback": dfu_flash_target,
+                "short_help": "Flash the DFU binary",
+                "order_dependencies": ["dfu"],
+            },
+        }
+    }
+
+    return dfu_actions if is_target_supported(project_path, SUPPORTED_TARGETS) else {}