diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..63ebf38
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,13 @@
+---
+BasedOnStyle: LLVM
+ColumnLimit: 120
+IndentWidth: 4
+TabWidth: 4
+UseTab: ForIndentation
+AlignEscapedNewlines: DontAlign
+AllowShortFunctionsOnASingleLine: Empty
+AlwaysBreakTemplateDeclarations: true
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterFunction: true
+...
diff --git a/.gitignore b/.gitignore
index 38e936d..9f584cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,10 @@
 Release
 Debug
 *.componentinfo.xml
-avrdude.bat
+*.elf
+*.o
+*.hex
+*.srec
+*.eeprom
+*.lss
+*.map
diff --git a/ds3231/ds3231 b/ds3231/ds3231
index 22a74d0..b3364f0 160000
--- a/ds3231/ds3231
+++ b/ds3231/ds3231
@@ -1 +1 @@
-Subproject commit 22a74d0b77c5cfee0d1969d50af40a06c96c3262
+Subproject commit b3364f0b8894cceaab8f2a30e142166ab8cac16f