diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a2a972..43462e8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,8 +11,10 @@ option(COMPILE_TESTS "Compile the tests" OFF)
 
 add_library(libblisp_obj OBJECT
         lib/blisp.c
+        lib/blisp_easy.c
+        lib/blisp_util.c
         lib/chip/blisp_chip_bl60x.c
-        lib/chip/blisp_chip_bl70x.c lib/blisp_easy.c)
+        lib/chip/blisp_chip_bl70x.c)
 
 target_include_directories(libblisp_obj PRIVATE ${CMAKE_SOURCE_DIR}/include/)
 
diff --git a/include/blisp_util.h b/include/blisp_util.h
index f1f4d8f..1f00480 100644
--- a/include/blisp_util.h
+++ b/include/blisp_util.h
@@ -2,35 +2,18 @@
 #ifndef _BLISP_UTIL_H
 #define _BLISP_UTIL_H
 
-#include <stdarg.h>
-#include <stdio.h>
+#include <stdint.h>
 #ifdef WIN32
-#include <windows.h>
+#  include <windows.h>
 #else
-#include <time.h>
+#  include <time.h>
 #endif
 
-static void blisp_dlog(const char* format, ...)
-{
-  fflush(stdout);
-  va_list args;
-  va_start(args, format);
-  vfprintf(stderr, format, args);
-  va_end(args);
-  fputc('\n', stderr);
-}
+void blisp_dlog(const char* format, ...);
 
+void sleep_ms(int milliseconds);
 
-static void sleep_ms(int milliseconds) {
-#ifdef WIN32
-  Sleep(milliseconds);
-#else
-  struct timespec ts;
-  ts.tv_sec = milliseconds / 1000;
-  ts.tv_nsec = (milliseconds % 1000) * 1000000;
-  nanosleep(&ts, NULL);
-#endif
-}
+uint32_t crc32_calculate(const void *data, size_t data_len);
 
 /**
  * * Generated on Mon Jan  9 19:56:36 2023
@@ -80,19 +63,4 @@ static const uint32_t crc_table[256] = {
     0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 };
 
-static uint32_t crc32_calculate(const void *data, size_t data_len)
-{
-  uint32_t crc = 0xffffffff;
-  const unsigned char *d = (const unsigned char *)data;
-  unsigned int tbl_idx;
-
-  while (data_len--) {
-    tbl_idx = (crc ^ *d) & 0xff;
-    crc = (crc_table[tbl_idx] ^ (crc >> 8)) & 0xffffffff;
-    d++;
-  }
-  return (crc & 0xffffffff) ^ 0xffffffff;
-}
-
-
-#endif
\ No newline at end of file
+#endif
diff --git a/lib/blisp_util.c b/lib/blisp_util.c
new file mode 100644
index 0000000..27bca4f
--- /dev/null
+++ b/lib/blisp_util.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: MIT
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#ifdef WIN32
+#  include <windows.h>
+#else
+#  include <time.h>
+#endif
+
+#include "blisp_util.h"
+
+void blisp_dlog(const char* format, ...)
+{
+  fflush(stdout);
+  va_list args;
+  va_start(args, format);
+  vfprintf(stderr, format, args);
+  va_end(args);
+  fputc('\n', stderr);
+}
+
+
+void sleep_ms(int milliseconds) {
+#ifdef WIN32
+  Sleep(milliseconds);
+#else
+  struct timespec ts;
+  ts.tv_sec = milliseconds / 1000;
+  ts.tv_nsec = (milliseconds % 1000) * 1000000;
+  nanosleep(&ts, NULL);
+#endif
+}
+
+uint32_t crc32_calculate(const void *data, size_t data_len)
+{
+  uint32_t crc = 0xffffffff;
+  const unsigned char *d = (const unsigned char *)data;
+  unsigned int tbl_idx;
+
+  while (data_len--) {
+    tbl_idx = (crc ^ *d) & 0xff;
+    crc = (crc_table[tbl_idx] ^ (crc >> 8)) & 0xffffffff;
+    d++;
+  }
+  return (crc & 0xffffffff) ^ 0xffffffff;
+}