I'm learning Avr Assembly. I'm writing a project that reads a uart string, then the string has to be saved in an array. Then the string has to be send back on the uart TX pin. I'm programming a ATMEGA8 microcontroller. I'm not sure everything is correct and probably some code will not be correct since I'm a starter in ASM avr.

first, I call the 'gets' subroutine to get the data from the uart pins. (I have the code from http://www.rjhcoding.com/avr-asm-uart.php)

gets:
    in      r17, UCSRA      
    sbrs    r17, RXC
    rjmp    gets

    in      r16, UDR        ; gets received character 

    cpi     r16, $0D        ; check if rcv'd char is CR (enter)
    breq    gets_end        ; branch if CR 

    st      X+,r16          ; store char in buffer 
    rjmp    gets            ; get another char 

gets_end: 
    ldi     r16, $00
    st      X+,r16
    ret     

But what I don't get about this code, how do I read the data in the X buffer and put it in a new Array? And how do I make and use that array?