flash openocd task

.vscode/tasks.json

@@ -53,6 +53,34 @@
                 "kind": "build",
                 "isDefault": true
             }
+        },
+		{
+            "label": "flash",
+            "type": "shell",
+            "command": "openocd",
+            "args": [
+                "-f",
+                "interface/stlink-v2.cfg",
+				"-f",
+				"target/stm32f4x.cfg",
+                "-c",
+                "init",
+                "-c",
+                "reset halt",
+                "-c",
+                "flash write_image erase ${workspaceFolder}/build/stm32.elf",
+                "-c",
+                "reset",
+                "-c",
+                "exit"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "problemMatcher": [
+                "$gcc"
+            ]
         }
 	]
 }