diff --git a/avr_usart.h b/avr_usart.h
index 821781d..2719026 100644
--- a/avr_usart.h
+++ b/avr_usart.h
@@ -5,6 +5,7 @@
  * Filename: avr_at-09.h
  */
 
+#include <avr/inttypes.h>
 
 //#############################
 //PIN DEFINES AND CONSTS
@@ -45,3 +46,15 @@ void init_usart0(void);
 void tx_usart0(unsigned char data);
 unsigned char rx_usart0(void);
 
+void serial0_write();
+void serial0_read();
+void serial0_set_baud(uint8_t baud);
+void seiral0_enable_timeouts(uint8_t ms);
+
+
+
+
+
+
+
+