diff --git a/core/src/usart.c b/core/src/usart.c
index af4bcb2..2a6bcb3 100644
--- a/core/src/usart.c
+++ b/core/src/usart.c
@@ -83,12 +83,13 @@ int usart_tx		(uint8_t usart,char *b,int size){
 	for (n=0;n<size;n++){
 		for (r=0;r<10;r++){
 			if (usart_write( usart, *(b++)) >= 0){
-				break;
+				return ESUCCESS;
 			};
 			wait_ms(1);
 		};
 	};
+	return -EFAIL;
 };
 
 	
-#endif
\ No newline at end of file
+#endif