diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 0000000..aedcdef
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,293 @@
+---
+Checks:          '-*,clang-diagnostic-*,clang-analyzer-*,-clang-analyzer-core.NullDereference,bugprone-*,misc-*,modernize-*,performance-*'
+WarningsAsErrors: ''
+HeaderFilterRegex: ''
+AnalyzeTemporaryDtors: false
+FormatStyle:     none
+CheckOptions:
+  - key:             performance-unnecessary-copy-initialization.ExcludedContainerTypes
+    value:           ''
+  - key:             modernize-replace-auto-ptr.IncludeStyle
+    value:           llvm
+  - key:             performance-move-const-arg.CheckTriviallyCopyableMove
+    value:           'true'
+  - key:             modernize-use-auto.MinTypeNameLength
+    value:           '5'
+  - key:             bugprone-reserved-identifier.Invert
+    value:           'false'
+  - key:             bugprone-narrowing-conversions.PedanticMode
+    value:           'false'
+  - key:             bugprone-unused-return-value.CheckedFunctions
+    value:           '::std::async;::std::launder;::std::remove;::std::remove_if;::std::unique;::std::unique_ptr::release;::std::basic_string::empty;::std::vector::empty;::std::back_inserter;::std::distance;::std::find;::std::find_if;::std::inserter;::std::lower_bound;::std::make_pair;::std::map::count;::std::map::find;::std::map::lower_bound;::std::multimap::equal_range;::std::multimap::upper_bound;::std::set::count;::std::set::find;::std::setfill;::std::setprecision;::std::setw;::std::upper_bound;::std::vector::at;::bsearch;::ferror;::feof;::isalnum;::isalpha;::isblank;::iscntrl;::isdigit;::isgraph;::islower;::isprint;::ispunct;::isspace;::isupper;::iswalnum;::iswprint;::iswspace;::isxdigit;::memchr;::memcmp;::strcmp;::strcoll;::strncmp;::strpbrk;::strrchr;::strspn;::strstr;::wcscmp;::access;::bind;::connect;::difftime;::dlsym;::fnmatch;::getaddrinfo;::getopt;::htonl;::htons;::iconv_open;::inet_addr;::isascii;::isatty;::mmap;::newlocale;::openat;::pathconf;::pthread_equal;::pthread_getspecific;::pthread_mutex_trylock;::readdir;::readlink;::recvmsg;::regexec;::scandir;::semget;::setjmp;::shm_open;::shmget;::sigismember;::strcasecmp;::strsignal;::ttyname'
+  - key:             cert-dcl16-c.NewSuffixes
+    value:           'L;LL;LU;LLU'
+  - key:             bugprone-narrowing-conversions.WarnOnFloatingPointNarrowingConversion
+    value:           'true'
+  - key:             modernize-use-default-member-init.UseAssignment
+    value:           'false'
+  - key:             bugprone-assert-side-effect.IgnoredFunctions
+    value:           __builtin_expect
+  - key:             modernize-use-override.AllowOverrideAndFinal
+    value:           'false'
+  - key:             modernize-pass-by-value.ValuesOnly
+    value:           'false'
+  - key:             modernize-loop-convert.IncludeStyle
+    value:           llvm
+  - key:             cert-str34-c.DiagnoseSignedUnsignedCharComparisons
+    value:           'false'
+  - key:             bugprone-narrowing-conversions.WarnWithinTemplateInstantiation
+    value:           'false'
+  - key:             cert-err33-c.CheckedFunctions
+    value:           '::aligned_alloc;::asctime_s;::at_quick_exit;::atexit;::bsearch;::bsearch_s;::btowc;::c16rtomb;::c32rtomb;::calloc;::clock;::cnd_broadcast;::cnd_init;::cnd_signal;::cnd_timedwait;::cnd_wait;::ctime_s;::fclose;::fflush;::fgetc;::fgetpos;::fgets;::fgetwc;::fopen;::fopen_s;::fprintf;::fprintf_s;::fputc;::fputs;::fputwc;::fputws;::fread;::freopen;::freopen_s;::fscanf;::fscanf_s;::fseek;::fsetpos;::ftell;::fwprintf;::fwprintf_s;::fwrite;::fwscanf;::fwscanf_s;::getc;::getchar;::getenv;::getenv_s;::gets_s;::getwc;::getwchar;::gmtime;::gmtime_s;::localtime;::localtime_s;::malloc;::mbrtoc16;::mbrtoc32;::mbsrtowcs;::mbsrtowcs_s;::mbstowcs;::mbstowcs_s;::memchr;::mktime;::mtx_init;::mtx_lock;::mtx_timedlock;::mtx_trylock;::mtx_unlock;::printf_s;::putc;::putwc;::raise;::realloc;::remove;::rename;::scanf;::scanf_s;::setlocale;::setvbuf;::signal;::snprintf;::snprintf_s;::sprintf;::sprintf_s;::sscanf;::sscanf_s;::strchr;::strerror_s;::strftime;::strpbrk;::strrchr;::strstr;::strtod;::strtof;::strtoimax;::strtok;::strtok_s;::strtol;::strtold;::strtoll;::strtoul;::strtoull;::strtoumax;::strxfrm;::swprintf;::swprintf_s;::swscanf;::swscanf_s;::thrd_create;::thrd_detach;::thrd_join;::thrd_sleep;::time;::timespec_get;::tmpfile;::tmpfile_s;::tmpnam;::tmpnam_s;::tss_create;::tss_get;::tss_set;::ungetc;::ungetwc;::vfprintf;::vfprintf_s;::vfscanf;::vfscanf_s;::vfwprintf;::vfwprintf_s;::vfwscanf;::vfwscanf_s;::vprintf_s;::vscanf;::vscanf_s;::vsnprintf;::vsnprintf_s;::vsprintf;::vsprintf_s;::vsscanf;::vsscanf_s;::vswprintf;::vswprintf_s;::vswscanf;::vswscanf_s;::vwprintf_s;::vwscanf;::vwscanf_s;::wcrtomb;::wcschr;::wcsftime;::wcspbrk;::wcsrchr;::wcsrtombs;::wcsrtombs_s;::wcsstr;::wcstod;::wcstof;::wcstoimax;::wcstok;::wcstok_s;::wcstol;::wcstold;::wcstoll;::wcstombs;::wcstombs_s;::wcstoul;::wcstoull;::wcstoumax;::wcsxfrm;::wctob;::wctrans;::wctype;::wmemchr;::wprintf_s;::wscanf;::wscanf_s;'
+  - key:             bugprone-suspicious-string-compare.WarnOnLogicalNotComparison
+    value:           'false'
+  - key:             misc-uniqueptr-reset-release.IncludeStyle
+    value:           llvm
+  - key:             bugprone-easily-swappable-parameters.QualifiersMix
+    value:           'false'
+  - key:             bugprone-suspicious-string-compare.WarnOnImplicitComparison
+    value:           'true'
+  - key:             modernize-use-emplace.TupleTypes
+    value:           '::std::pair;::std::tuple'
+  - key:             modernize-use-emplace.TupleMakeFunctions
+    value:           '::std::make_pair;::std::make_tuple'
+  - key:             bugprone-narrowing-conversions.WarnOnIntegerToFloatingPointNarrowingConversion
+    value:           'true'
+  - key:             bugprone-easily-swappable-parameters.SuppressParametersUsedTogether
+    value:           'true'
+  - key:             bugprone-argument-comment.StrictMode
+    value:           '0'
+  - key:             modernize-use-nodiscard.ReplacementString
+    value:           '[[nodiscard]]'
+  - key:             misc-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value:           'false'
+  - key:             modernize-replace-random-shuffle.IncludeStyle
+    value:           llvm
+  - key:             modernize-loop-convert.MakeReverseRangeHeader
+    value:           ''
+  - key:             modernize-use-bool-literals.IgnoreMacros
+    value:           'true'
+  - key:             bugprone-easily-swappable-parameters.NamePrefixSuffixSilenceDissimilarityTreshold
+    value:           '1'
+  - key:             bugprone-unhandled-self-assignment.WarnOnlyIfThisHasSuspiciousField
+    value:           'true'
+  - key:             google-readability-namespace-comments.ShortNamespaceLines
+    value:           '10'
+  - key:             bugprone-suspicious-string-compare.StringCompareLikeFunctions
+    value:           ''
+  - key:             misc-definitions-in-headers.HeaderFileExtensions
+    value:           ';h;hh;hpp;hxx'
+  - key:             modernize-avoid-bind.PermissiveParameterList
+    value:           'false'
+  - key:             modernize-use-override.FinalSpelling
+    value:           final
+  - key:             bugprone-argument-comment.CommentNullPtrs
+    value:           '0'
+  - key:             bugprone-easily-swappable-parameters.IgnoredParameterNames
+    value:           '"";iterator;Iterator;begin;Begin;end;End;first;First;last;Last;lhs;LHS;rhs;RHS'
+  - key:             modernize-loop-convert.UseCxx20ReverseRanges
+    value:           'true'
+  - key:             modernize-use-noexcept.ReplacementString
+    value:           ''
+  - key:             modernize-use-using.IgnoreMacros
+    value:           'true'
+  - key:             performance-type-promotion-in-math-fn.IncludeStyle
+    value:           llvm
+  - key:             bugprone-narrowing-conversions.WarnOnIntegerNarrowingConversion
+    value:           'true'
+  - key:             modernize-loop-convert.NamingStyle
+    value:           CamelCase
+  - key:             bugprone-suspicious-include.ImplementationFileExtensions
+    value:           'c;cc;cpp;cxx'
+  - key:             modernize-loop-convert.MakeReverseRangeFunction
+    value:           ''
+  - key:             bugprone-suspicious-include.HeaderFileExtensions
+    value:           ';h;hh;hpp;hxx'
+  - key:             performance-no-automatic-move.AllowedTypes
+    value:           ''
+  - key:             performance-for-range-copy.WarnOnAllAutoCopies
+    value:           'false'
+  - key:             bugprone-argument-comment.CommentIntegerLiterals
+    value:           '0'
+  - key:             bugprone-stringview-nullptr.IncludeStyle
+    value:           llvm
+  - key:             bugprone-suspicious-missing-comma.SizeThreshold
+    value:           '5'
+  - key:             modernize-pass-by-value.IncludeStyle
+    value:           llvm
+  - key:             bugprone-sizeof-expression.WarnOnSizeOfThis
+    value:           'true'
+  - key:             bugprone-string-constructor.WarnOnLargeLength
+    value:           'true'
+  - key:             bugprone-too-small-loop-variable.MagnitudeBitsUpperLimit
+    value:           '16'
+  - key:             bugprone-argument-comment.CommentFloatLiterals
+    value:           '0'
+  - key:             bugprone-argument-comment.CommentCharacterLiterals
+    value:           '0'
+  - key:             modernize-use-nullptr.NullMacros
+    value:           'NULL'
+  - key:             modernize-make-shared.IgnoreMacros
+    value:           'true'
+  - key:             bugprone-dynamic-static-initializers.HeaderFileExtensions
+    value:           ';h;hh;hpp;hxx'
+  - key:             bugprone-suspicious-enum-usage.StrictMode
+    value:           'false'
+  - key:             performance-unnecessary-copy-initialization.AllowedTypes
+    value:           ''
+  - key:             bugprone-suspicious-missing-comma.MaxConcatenatedTokens
+    value:           '5'
+  - key:             modernize-use-transparent-functors.SafeMode
+    value:           'false'
+  - key:             modernize-make-shared.IgnoreDefaultInitialization
+    value:           'true'
+  - key:             bugprone-implicit-widening-of-multiplication-result.UseCXXHeadersInCppSources
+    value:           'true'
+  - key:             bugprone-not-null-terminated-result.WantToUseSafeFunctions
+    value:           'true'
+  - key:             modernize-make-shared.IncludeStyle
+    value:           llvm
+  - key:             bugprone-string-constructor.LargeLengthThreshold
+    value:           '8388608'
+  - key:             misc-throw-by-value-catch-by-reference.CheckThrowTemporaries
+    value:           'true'
+  - key:             bugprone-implicit-widening-of-multiplication-result.UseCXXStaticCastsInCppSources
+    value:           'true'
+  - key:             cert-oop54-cpp.WarnOnlyIfThisHasSuspiciousField
+    value:           'false'
+  - key:             bugprone-signed-char-misuse.CharTypdefsToIgnore
+    value:           ''
+  - key:             performance-inefficient-vector-operation.EnableProto
+    value:           'false'
+  - key:             bugprone-exception-escape.FunctionsThatShouldNotThrow
+    value:           ''
+  - key:             modernize-loop-convert.MaxCopySize
+    value:           '16'
+  - key:             bugprone-argument-comment.CommentStringLiterals
+    value:           '0'
+  - key:             modernize-make-shared.MakeSmartPtrFunction
+    value:           'std::make_shared'
+  - key:             bugprone-easily-swappable-parameters.MinimumLength
+    value:           '2'
+  - key:             modernize-use-override.IgnoreDestructors
+    value:           'false'
+  - key:             modernize-make-unique.IgnoreMacros
+    value:           'true'
+  - key:             modernize-make-shared.MakeSmartPtrFunctionHeader
+    value:           '<memory>'
+  - key:             performance-for-range-copy.AllowedTypes
+    value:           ''
+  - key:             misc-non-private-member-variables-in-classes.IgnorePublicMemberVariables
+    value:           'false'
+  - key:             bugprone-sizeof-expression.WarnOnSizeOfConstant
+    value:           'true'
+  - key:             modernize-make-unique.IgnoreDefaultInitialization
+    value:           'true'
+  - key:             modernize-use-emplace.ContainersWithPushBack
+    value:           '::std::vector;::std::list;::std::deque'
+  - key:             modernize-make-unique.IncludeStyle
+    value:           llvm
+  - key:             bugprone-argument-comment.CommentBoolLiterals
+    value:           '0'
+  - key:             bugprone-argument-comment.CommentUserDefinedLiterals
+    value:           '0'
+  - key:             modernize-use-override.OverrideSpelling
+    value:           override
+  - key:             performance-inefficient-string-concatenation.StrictMode
+    value:           'false'
+  - key:             bugprone-easily-swappable-parameters.IgnoredParameterTypeSuffixes
+    value:           'bool;Bool;_Bool;it;It;iterator;Iterator;inputit;InputIt;forwardit;ForwardIt;bidirit;BidirIt;constiterator;const_iterator;Const_Iterator;Constiterator;ConstIterator;RandomIt;randomit;random_iterator;ReverseIt;reverse_iterator;reverse_const_iterator;ConstReverseIterator;Const_Reverse_Iterator;const_reverse_iterator;Constreverseiterator;constreverseiterator'
+  - key:             google-readability-braces-around-statements.ShortStatementLines
+    value:           '1'
+  - key:             modernize-make-unique.MakeSmartPtrFunction
+    value:           'std::make_unique'
+  - key:             bugprone-reserved-identifier.AllowedIdentifiers
+    value:           ''
+  - key:             modernize-use-emplace.IgnoreImplicitConstructors
+    value:           'false'
+  - key:             modernize-make-unique.MakeSmartPtrFunctionHeader
+    value:           '<memory>'
+  - key:             bugprone-signal-handler.AsyncSafeFunctionSet
+    value:           POSIX
+  - key:             modernize-use-equals-delete.IgnoreMacros
+    value:           'true'
+  - key:             bugprone-easily-swappable-parameters.ModelImplicitConversions
+    value:           'true'
+  - key:             bugprone-misplaced-widening-cast.CheckImplicitCasts
+    value:           'false'
+  - key:             bugprone-suspicious-missing-comma.RatioThreshold
+    value:           '0.200000'
+  - key:             modernize-loop-convert.MinConfidence
+    value:           reasonable
+  - key:             performance-unnecessary-value-param.AllowedTypes
+    value:           ''
+  - key:             misc-definitions-in-headers.UseHeaderFileExtension
+    value:           'true'
+  - key:             misc-throw-by-value-catch-by-reference.MaxSize
+    value:           '-1'
+  - key:             modernize-use-noexcept.UseNoexceptFalse
+    value:           'true'
+  - key:             google-readability-namespace-comments.SpacesBeforeComments
+    value:           '2'
+  - key:             cppcoreguidelines-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value:           'true'
+  - key:             bugprone-argument-comment.IgnoreSingleArgument
+    value:           '0'
+  - key:             bugprone-narrowing-conversions.WarnOnEquivalentBitWidth
+    value:           'true'
+  - key:             bugprone-sizeof-expression.WarnOnSizeOfIntegerExpression
+    value:           'false'
+  - key:             performance-faster-string-find.StringLikeClasses
+    value:           '::std::basic_string;::std::basic_string_view'
+  - key:             bugprone-assert-side-effect.CheckFunctionCalls
+    value:           'false'
+  - key:             bugprone-narrowing-conversions.IgnoreConversionFromTypes
+    value:           ''
+  - key:             bugprone-string-constructor.StringNames
+    value:           '::std::basic_string;::std::basic_string_view'
+  - key:             bugprone-assert-side-effect.AssertMacros
+    value:           assert,NSAssert,NSCAssert
+  - key:             bugprone-exception-escape.IgnoredExceptions
+    value:           ''
+  - key:             bugprone-signed-char-misuse.DiagnoseSignedUnsignedCharComparisons
+    value:           'true'
+  - key:             modernize-use-default-member-init.IgnoreMacros
+    value:           'true'
+  - key:             llvm-qualified-auto.AddConstToQualified
+    value:           'false'
+  - key:             google-readability-function-size.StatementThreshold
+    value:           '800'
+  - key:             llvm-else-after-return.WarnOnConditionVariables
+    value:           'false'
+  - key:             bugprone-sizeof-expression.WarnOnSizeOfCompareToConstant
+    value:           'true'
+  - key:             bugprone-reserved-identifier.AggressiveDependentMemberLookup
+    value:           'false'
+  - key:             modernize-raw-string-literal.DelimiterStem
+    value:           lit
+  - key:             modernize-use-equals-default.IgnoreMacros
+    value:           'true'
+  - key:             misc-throw-by-value-catch-by-reference.WarnOnLargeObjects
+    value:           'false'
+  - key:             modernize-raw-string-literal.ReplaceShorterLiterals
+    value:           'false'
+  - key:             modernize-use-emplace.SmartPointers
+    value:           '::std::shared_ptr;::std::unique_ptr;::std::auto_ptr;::std::weak_ptr'
+  - key:             performance-inefficient-vector-operation.VectorLikeClasses
+    value:           '::std::vector'
+  - key:             modernize-use-auto.RemoveStars
+    value:           'false'
+  - key:             bugprone-dangling-handle.HandleClasses
+    value:           'std::basic_string_view;std::experimental::basic_string_view'
+  - key:             bugprone-implicit-widening-of-multiplication-result.IncludeStyle
+    value:           llvm
+  - key:             performance-unnecessary-value-param.IncludeStyle
+    value:           llvm
+  - key:             misc-unused-parameters.StrictMode
+    value:           'false'
+  - key:             modernize-replace-disallow-copy-and-assign-macro.MacroName
+    value:           DISALLOW_COPY_AND_ASSIGN
+  - key:             llvm-else-after-return.WarnOnUnfixable
+    value:           'false'
+...
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 048f292..14d1715 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,7 +21,6 @@ try_compile(LIBC_VERSION_TEST
 
 if(NOT LIBC_VERSION_TEST)
     include(FetchContent)
-    # attiny_atpack_SOURCE_DIR is downloaded/extracted location
     FetchContent_Declare(
         attiny_atpack
         URL http://packs.download.atmel.com/Atmel.ATtiny_DFP.2.0.368.atpack
@@ -65,8 +64,7 @@ endif(CMAKE_BUILD_TYPE MATCHES Debug)
 add_avr_executable(sniffer
     src/sniffer.c
     src/com232.c
-    src/avclandrv.c
-    src/GlobalDef.c)
+    src/avclandrv.c)
 
 target_link_options(sniffer PUBLIC
     -B "${attiny_atpack_SOURCE_DIR}/gcc/dev/${AVR_MCU}"
diff --git a/scripts/install-toolchain.sh b/scripts/install-toolchain.sh
index 4cc27ad..bb93903 100644
--- a/scripts/install-toolchain.sh
+++ b/scripts/install-toolchain.sh
@@ -1 +1 @@
-sudo apk --no-cache add make cmake avrdude avr-libc gcc-avr
\ No newline at end of file
+sudo apk add make cmake avrdude avr-libc gcc-avr
\ No newline at end of file
diff --git a/src/avclandrv.c b/src/avclandrv.c
index 23b4b3b..69a204f 100644
--- a/src/avclandrv.c
+++ b/src/avclandrv.c
@@ -27,8 +27,9 @@
 
 */
 
-#include <avr/interrupt.h>
 #include <avr/io.h>
+#include <avr/sfr_defs.h>
+#include <stdint.h>
 
 #include "avclandrv.h"
 #include "com232.h"
@@ -341,7 +342,7 @@ uint8_t AVCLAN_sendbitsi(const uint8_t *byte, int8_t len) {
   int8_t len_mod8 = 8;
 
   if (len & 0x7) {
-    len_mod8 = len & 0x7;
+    len_mod8 = (int8_t)(len & 0x7);
     b <<= (uint8_t)(8 - len_mod8);
   }
 
diff --git a/src/com232.c b/src/com232.c
index b115c6f..bf67ede 100644
--- a/src/com232.c
+++ b/src/com232.c
@@ -24,9 +24,12 @@
 
 */
 
-#include "com232.h"
 #include <avr/interrupt.h>
 #include <avr/io.h>
+#include <avr/sfr_defs.h>
+#include <stdint.h>
+
+#include "com232.h"
 
 uint8_t RS232_RxCharBuffer[25], RS232_RxCharBegin, RS232_RxCharEnd;
 uint8_t readkey;
diff --git a/src/sniffer.c b/src/sniffer.c
index 405e859..05791ae 100644
--- a/src/sniffer.c
+++ b/src/sniffer.c
@@ -26,6 +26,8 @@
 
 #include <avr/interrupt.h>
 #include <avr/io.h>
+#include <avr/sfr_defs.h>
+#include <stdint.h>
 
 #include "avclandrv.h"
 #include "com232.h"