Defined serial0_write() function

avr_usart.c

@@ -132,7 +132,11 @@ unsigned char rx_usart0(void) {
  * Output: None
  * Description:
  */
-
+void serial0_write(char* buffer, uint8_t write_length) {
+    for(uint8_t i = 0; i < write_length; i++) {
+        tx_usart0(buffer[i]);
+    }
+}
 
 /*
  * Inupt: A serialbuffer and length