Write X86/64 ALP to convert 4-digit Hex number into its equivalent BCD number and 5-digit BCD number into its equivalent HEX number.

Second Year Computer Engineering Microprocessor Programs:

Microprocessor Lab:

Practicle 3:
       Write X86/64 ALP to convert 4-digit Hex number into its equivalent BCD number and 5-digit BCD number into its equivalent HEX number. Make your program user friendly to accept the choice from user for:
a) HEX to BCD
b) BCD to HEX
c) EXIT.
Display proper strings to prompt the user while accepting the input and displaying the result. 
----------------------------------------------------------------------------------------------------------------------------------
%macro print 2
mov rax,1
mov rdi,1
mov rsi,%1
mov rdx,%2
syscall
%endmacro
   %macro read 2
  mov rax,0   ; sys_inp
  mov rdi,0   ; sys_std_ipd
  mov rsi,%1
  mov rdx,%2
  syscall
   %endmacro
section .data
msg db 10,10, "***Menu***"
   db 10,10, "1.Hex to BCD"
   db 10,10, "2.BCD to Hex"
   db 10,10, "3.Exit"
   db 10,10, "Please enter your choice:"
        msglen equ $-msg

msg1 db "Wrong choice",10
msg1len equ $-msg1

        hexmsg db "enter 4 digit hex. no.:",10
hexmsglen equ $-hexmsg

        hexmsg1 db "its Equ BCD is:",10
  hexmsg1len equ $-hexmsg1

bcdmsg db "Enter 5 digit bcd no.:",10
bcdmsglen equ $-bcdmsg

bcdmsg1 db "Its equ. hex no. is:",10
bcdmsg1len equ $-bcdmsg1

section .bss
 numascii resb 06
 opbuff resb 05
          dnumbuff resb 08

section .txt
global _start
_start:
print msg,msglen
read numascii,2
cmp byte[numascii],"1"
jne case2
call hex2bcd
jmp _start

case2:
cmp byte[numascii],"2"
jne case3
call bcd2hex
jmp _start

case3:
cmp byte[numascii],"3"
je exit
print msg1,msg1len
jmp _start

exit:
mov rax,60
mov rdi,0
syscall

hex2bcd:
print hexmsg,hexmsglen
read numascii,05
call packnum
mov rcx,0
mov ax,bx
mov bx,10h
up2:
mov rdx,0
div bx
push rdx
inc rcx
cmp ax,0
jne h2bup1
mov rdi,opbuff

h2bup1:
pop rdx
add dl,30h
mov [rdi],dl
inc rdi
loop h2bup1





packnum:
mov bx,0
mov rcx,4
mov rsi,numascii



up1:
rol bx,04
mov al,[rsi]
cmp al,39h
jbe skip1
sub al,07h


skip1:
sub al,30h
add bl,al
loop up1
ret


bcd2hex:
print bcdmsg,bcdmsglen
read numascii,06
print bcdmsg1,bcdmsg1len
mov rcx,05
mov rsi,numascii
mov rax,0
mov rbx,0Ah
again1:
mov rdx,0
mul rbx
mov dl,[rsi]
sub dl,30h
add rax,rdx
inc rsi
loop again1
mov rbx,rax
call dispnum
ret


dispnum:
mov rdi,dnumbuff
mov rcx,08

up3:
rol ebx,04
mov dl,bl
and dl,0Fh
add dl,30h
cmp dl,39h
jbe dskip1
add dl,07h

dskip1:
mov [rdi],dl
inc rdi
loop up3
print dnumbuff+4,4
ret
----------------------------------------------------------------------------------------------------------------------------------
 

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