diff --git a/CMakeLists.txt b/CMakeLists.txt
index 72696932..66e3d802 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,4 +43,4 @@ if (ENABLE_FD_LOGS)
     if (LOG_LEVEL)
        add_definitions("-DTINY_LOG_LEVEL_DEFAULT=${LOG_LEVEL}")
     endif()
-endif()
\ No newline at end of file
+endif()
diff --git a/examples/linux/hdlc_demo_multithread/hdlc_demo_multithread.cpp b/examples/linux/hdlc_demo_multithread/hdlc_demo_multithread.cpp
index 73e7de29..7a26fdc5 100644
--- a/examples/linux/hdlc_demo_multithread/hdlc_demo_multithread.cpp
+++ b/examples/linux/hdlc_demo_multithread/hdlc_demo_multithread.cpp
@@ -39,7 +39,7 @@ static bool peek_next;
 static void send_message(const char *message)
 {
     tiny_mutex_lock(&queue_mutex);
-    char *msg = _strdup(message);
+    char *msg = strdup(message);
     queue.push(msg);
     tiny_mutex_unlock(&queue_mutex);
 }
diff --git a/examples/linux/loopback/tiny_loopback.cpp b/examples/linux/loopback/tiny_loopback.cpp
index cf327fa4..df60da84 100644
--- a/examples/linux/loopback/tiny_loopback.cpp
+++ b/examples/linux/loopback/tiny_loopback.cpp
@@ -227,6 +227,7 @@ static int run_fd(tiny_serial_handle_t port)
             {
                 fprintf(stderr, "Failed to send packet\n");
             }
+            std::this_thread::sleep_for(std::chrono::milliseconds(1000));
         }
         else
         {
diff --git a/src/hal/tiny_debug.h b/src/hal/tiny_debug.h
index 3b59f02a..e13947a4 100644
--- a/src/hal/tiny_debug.h
+++ b/src/hal/tiny_debug.h
@@ -65,6 +65,11 @@ extern "C"
         if ( lvl < g_tiny_log_level )                                                                                  \
             fprintf(stderr, "%08" PRIu32 " ms: " fmt, tiny_millis(), ##__VA_ARGS__);                                   \
     }
+#define TINY_LOG0(lvl, fmt)                                                                                            \
+    {                                                                                                                  \
+        if ( lvl < g_tiny_log_level )                                                                                  \
+            fprintf(stderr, "%08" PRIu32 " ms: " fmt, tiny_millis());                                                  \
+    }
 #else
 #define TINY_LOG(...)
 #endif
diff --git a/src/proto/crc/tiny_crc.c b/src/proto/crc/tiny_crc.c
index dee20f4f..4edb1ba8 100644
--- a/src/proto/crc/tiny_crc.c
+++ b/src/proto/crc/tiny_crc.c
@@ -161,9 +161,13 @@ uint16_t tiny_chksum(uint16_t sum, const uint8_t* data, int data_length)
 
 int get_crc_field_size(hdlc_crc_t crc_type)
 {
-    if ( crc_type == 0xFF )
+    if ( crc_type == HDLC_CRC_OFF )
     {
         return 0;
     }
+    if ( crc_type == HDLC_CRC_DEFAULT )
+    {
+        crc_type = HDLC_CRC_32;
+    }
     return (int)crc_type / 8;
 }
diff --git a/src/proto/fd/tiny_fd.c b/src/proto/fd/tiny_fd.c
index 91480ef0..3be853cf 100644
--- a/src/proto/fd/tiny_fd.c
+++ b/src/proto/fd/tiny_fd.c
@@ -38,7 +38,7 @@
 #endif
 
 #if TINY_FD_DEBUG
-#define LOG(lvl, fmt, ...) TINY_LOG(lvl, fmt, __VA_ARGS__)
+#define LOG(lvl, fmt, ...) TINY_LOG(lvl, fmt, ##__VA_ARGS__)
 #else
 #define LOG(...)
 #endif