let's use the avr helper library instead

.gitignore

@@ -0,0 +1 @@
+build/

.vscode/c_cpp_properties.json

@@ -1,21 +1,14 @@
 {
     "configurations": [
-        {
-            "includePath": [
-                "/usr/avr/include"
-            ],
-            "intelliSenseMode": "linux-gcc-x64",
-            "compilerPath": "/usr/lib64/ccache/clang",
-            "cStandard": "c17",
-            "cppStandard": "c++17"
-        },
         {
             "name": "AVR",
             "intelliSenseMode": "${default}",
-            "compilerPath": "",
             "cStandard": "${default}",
             "cppStandard": "${default}",
-            "includePath": [],
+            "includePath": [
+                "/usr/avr/lib/**",
+                "/usr/avr/include/**"
+            ],
             "compilerArgs": [
                 "-g",
                 "-Os",
@@ -24,8 +17,11 @@
                 "-fpermissive",
                 "-fno-exceptions",
                 "-fno-threadsafe-statics",
-                "-pipe"
-            ]
+                "-pipe",
+                "-mmcu=atmega2560",
+                "-DF_CPU=16000000UL"
+            ],
+            "compilerPath": "/usr/bin/avr-gcc"
         }
     ],
     "version": 4

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+    "recommendations": [
+        "alex079.vscode-avr-helper",
+        "ms-vscode.cpptools"
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,20 @@
+{
+    "AVR.reporter.arguments": [
+        "-C"
+    ],
+    "AVR.source.compiler": "/usr/bin/avr-gcc",
+    "AVR.programmer.tool": "/usr/bin/avrdude",
+    "AVR.source.libraries": [
+        "/usr/avr/lib",
+        "/usr/avr/include"
+    ],
+    "C_Cpp.default.compilerPath": "/usr/bin/avr-gcc",
+    "AVR.device.type": "atmega2560",
+    "AVR.device.frequency": 16000000,
+    "AVR.programmer.type": "wiring",
+    "AVR.programmer.port": "/dev/ttyACM0",
+    "AVR.programmer.rate": 115200,
+    "AVR.programmer.arguments": [
+        "-D"
+    ]
+}