Implement "erase" target

Author: ivankravets

builder/main.py

@@ -184,6 +184,12 @@ def _update_max_upload_size(env):
     SIZECHECKCMD="$SIZETOOL -A -d $SOURCES",
     SIZEPRINTCMD='$SIZETOOL -B -d $SOURCES',
 
+    ERASEFLAGS=[
+        "-cp", "$UPLOAD_PORT",
+        "-cd", "$UPLOAD_RESETMETHOD"
+    ],
+    ERASECMD='esptool $ERASEFLAGS -ce',
+
     PROGSUFFIX=".elf"
 )
 
@@ -376,6 +382,17 @@ def _update_max_upload_size(env):
      env.VerboseAction("$UPLOADCMD", "Uploading $SOURCE")])
 env.AlwaysBuild(target_upload)
 
+#
+# Target: Erase Flash
+#
+
+AlwaysBuild(
+    env.Alias("erase", None, [
+        env.VerboseAction(env.AutodetectUploadPort,
+                          "Looking for serial port..."),
+        env.VerboseAction("$ERASECMD", "Ready for erasing")
+    ]))
+
 
 #
 # Default targets