diff --git a/firmware/build/default/production/command.o b/firmware/build/default/production/command.o
index a659817..01c82fb 100644
Binary files a/firmware/build/default/production/command.o and b/firmware/build/default/production/command.o differ
diff --git a/firmware/build/default/production/main.o b/firmware/build/default/production/main.o
index fbc48db..10212b3 100644
Binary files a/firmware/build/default/production/main.o and b/firmware/build/default/production/main.o differ
diff --git a/firmware/build/default/production/main.o.d b/firmware/build/default/production/main.o.d
index c485f7b..ebd40e8 100644
--- a/firmware/build/default/production/main.o.d
+++ b/firmware/build/default/production/main.o.d
@@ -15,10 +15,7 @@ build/default/production/main.o.d build/default/production/main.o: main.c \
  /opt/microchip/xc8/v2.36/avr/avr/include/avr/lock.h \
  /opt/microchip/xc8/v2.36/avr/avr/include/avr/interrupt.h \
  /opt/microchip/xc8/v2.36/avr/avr/include/string.h constants.h command.h \
- usart.h /opt/microchip/xc8/v2.36/avr/avr/include/stdio.h \
- /opt/microchip/xc8/v2.36/avr/avr/include/util/delay.h \
- /opt/microchip/xc8/v2.36/avr/avr/include/util/delay_basic.h \
- /opt/microchip/xc8/v2.36/avr/avr/include/math.h
+ usart.h /opt/microchip/xc8/v2.36/avr/avr/include/stdio.h
 
 /opt/microchip/xc8/v2.36/avr/avr/include/avr/io.h:
 
@@ -59,9 +56,3 @@ command.h:
 usart.h:
 
 /opt/microchip/xc8/v2.36/avr/avr/include/stdio.h:
-
-/opt/microchip/xc8/v2.36/avr/avr/include/util/delay.h:
-
-/opt/microchip/xc8/v2.36/avr/avr/include/util/delay_basic.h:
-
-/opt/microchip/xc8/v2.36/avr/avr/include/math.h:
diff --git a/firmware/command.h b/firmware/command.h
index 89b31e6..d8a0dde 100644
--- a/firmware/command.h
+++ b/firmware/command.h
@@ -4,7 +4,6 @@
 #include <avr/io.h>
 #include <string.h>
 
-#define EOT 0x04
 #define COMMAND_SIZE 5
 #define COMMAND_MAX_NAME_LENGTH 20
 
diff --git a/firmware/constants.h b/firmware/constants.h
index 0aae073..23d5655 100644
--- a/firmware/constants.h
+++ b/firmware/constants.h
@@ -4,6 +4,7 @@
 #define F_CPU           4000000UL
 #define BAUD_RATE       9600
 #define BUFFER_SIZE     20
+#define EOT 0x04
 
 #endif	/* CONSTANTS_H */
 
diff --git a/firmware/dist/default/production/firmware.production.elf b/firmware/dist/default/production/firmware.production.elf
index 467b2a1..7aba377 100755
Binary files a/firmware/dist/default/production/firmware.production.elf and b/firmware/dist/default/production/firmware.production.elf differ
diff --git a/firmware/dist/default/production/firmware.production.map b/firmware/dist/default/production/firmware.production.map
index b9b7c44..e0416e3 100644
--- a/firmware/dist/default/production/firmware.production.map
+++ b/firmware/dist/default/production/firmware.production.map
@@ -431,12 +431,12 @@ END GROUP
 .debug_pubnames
  *(.debug_pubnames)
 
-.debug_info     0x0000000000000000     0x4097
+.debug_info     0x0000000000000000     0x408e
  *(.debug_info .gnu.linkonce.wi.*)
  .debug_info    0x0000000000000000     0x2c24 /opt/microchip/mplabx/v6.00/packs/Microchip/AVR-Dx_DFP/1.10.124/xc8/avr/lib/avrxmega4/memx-const/mapped/crtavr128da48.o
- .debug_info    0x0000000000002c24      0x828 build/default/production/main.o
- .debug_info    0x000000000000344c      0x6cf build/default/production/usart.o
- .debug_info    0x0000000000003b1b      0x57c build/default/production/command.o
+ .debug_info    0x0000000000002c24      0x81f build/default/production/main.o
+ .debug_info    0x0000000000003443      0x6cf build/default/production/usart.o
+ .debug_info    0x0000000000003b12      0x57c build/default/production/command.o
 
 .debug_abbrev   0x0000000000000000     0x2e21
  *(.debug_abbrev)
diff --git a/firmware/main.c b/firmware/main.c
index 0423575..00ce4f0 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -4,7 +4,6 @@
 #include "constants.h"
 #include "command.h"
 #include "usart.h"
-#include <util/delay.h>
 
 char buffer[BUFFER_SIZE];
 volatile uint8_t buff_idx = 0;
diff --git a/firmware/nbproject/private/private.xml b/firmware/nbproject/private/private.xml
index 6807a2b..a066363 100644
--- a/firmware/nbproject/private/private.xml
+++ b/firmware/nbproject/private/private.xml
@@ -2,6 +2,11 @@
 <project-private xmlns="http://www.netbeans.org/ns/project-private/1">
     <editor-bookmarks xmlns="http://www.netbeans.org/ns/editor-bookmarks/2" lastBookmarkId="0"/>
     <open-files xmlns="http://www.netbeans.org/ns/projectui-open-files/2">
-        <group/>
+        <group>
+            <file>file:/home/sergeyyarkov/Documents/Applications/avr128da48_web-serial-example/firmware/main.c</file>
+            <file>file:/home/sergeyyarkov/Documents/Applications/avr128da48_web-serial-example/firmware/constants.h</file>
+            <file>file:/home/sergeyyarkov/Documents/Applications/avr128da48_web-serial-example/firmware/usart.h</file>
+            <file>file:/home/sergeyyarkov/Documents/Applications/avr128da48_web-serial-example/firmware/usart.c</file>
+        </group>
     </open-files>
 </project-private>
diff --git a/firmware/usart.c b/firmware/usart.c
index 9eb88e1..38905cd 100644
--- a/firmware/usart.c
+++ b/firmware/usart.c
@@ -11,7 +11,7 @@ void USART1_Initialize(void) {
   PORTC.DIRSET = PIN0_bm;
   PORTC.DIRCLR = PIN1_bm;
 
-  /* enable reveice complete interrupt */
+  /* enable receive complete interrupt */
   USART1.CTRLA = USART_RXCIE_bm;
 
   /* enable transmitter and receiver */