Basic ARM LPC218 ASSEMBLY CODES-I

PROGRAM 1.a:

ADDITION OF TWO 32 BIT NUMBERS.

area addition,code,readonly
entry
            mov r0,#00000009
mov r1,#00000005
add r2,r1,r0
end



PROGRAM 1.b:


ADDITION OF TWO 64 BIT NUMBERS.


        area addition,code,readonly
entry
             ldr r0,=0x11111111
ldr r1,=0x22222222
ldr r2,=0x33333333
ldr r3,=0x44444444
adds r4,r0,r2
adcs r5,r1,r3

end


PROGRAM 1.c:

ADDITION OF 'N' 32 BIT NUMBERS.

       area nadd,code,readonly
entry
             ldr r0,=0x40000000
             mov r2,#05             // number of 32 bit no. to be added

             ldr r3,[r0],#04
back      ldr r4,[r0],#04
            add r3,r3,r4
            subs r2,r2,#01
            cmp r2,#00
             bne back
stop   b  stop

             end



PROGRAM 2.a:

DATA EXCHANGE


   area data_exch,code,readonly
entry
      ldr r0,=0x40000000
      ldr r1,=0x40000044
      mov r4,#09

loop  ldr r2,[r0]
      mov r5,r2
      ldr r6,[r1]
      str r6,[r0],#04
      str r5,[r1],#04
      subs r4,#01
      cmp r4,#00
      bne loop
stop  b stop

      end



PROGRAM 2.b:

BLOCK OF DATA TRANSFER


     area data_trans,code,readonly
entry
             ldr r0,=0x40000000
     ldr r1,=0x40000044
     mov r4,#09

loop     ldr r2,[r0],#04
            str r2,[r1],#04
    subs r4,#01
    cmp r4,#00
    bne loop
stop  b stop

          end




PROGRAM 3.a:

COVERTING ASCII TO HEX

      area ascii_hex,code,readonly
entry
       mov r0,#&41
  mov r1,#&46
  mov r3,r0
  bl next
  mov r4,r3,lsl#04
  mov r3,r1
  bl next
  add r5,r4,r3
  b stop

next   cmp r3,#&39
  subls r3,r3,#&30
  subgt r3,r3,#&37
  mov pc,lr
stop   b stop
    end



PROGRAM 3.b:

CONVERTING HEX NUMBER TO ASCII NUMBER

     area hex_ascii,code,readonly
entry
      mov r0,#&af
      mov r1,r0
      and r2,r1,#&0f
      bl next
      mov r3,r2
      and r2,r0,#&f0
      mov r2,r2,lsr#04
      bl next
      b stop

next  cmp r2,#09
      addcs r2,r2,#&37
      addcc r2,r2,#&30
      mov pc,lr
stop  b stop

      end




PROGRAM 3.c:

CONVERTING BINARY TO GRAY

     area binary_gray,code,readonly
entry
     mov r0,#0x06
     mov r1,#08
     lsr r2,r2,#01
     eor r2,r2,r1
stop b stop

     end



PROGRAM 3.d:

CONVERTING GRAY TO BINARY

        area gray_binary,code,readonly
entry
                mov r0,#0x58
mov r1,r0
mov r2,#07
loop   mov r1,r1,lsr#01
eor r0,r0,r1
subs r2,r2,#01
cmp r2,#00
bne loop
stop    b  stop

 end



PROGRAM 4:

DIVISION OF TWO NUMBERS BY SUCCESSIVE SUBTRACTION 


area division,code,readonly
entry
     mov r0,#25
     mov r1,#04
     cmp r0,r1
     movge r3,r0
     movls r3,r1
     movcs r4,r1
     movcc r4,r0

loop subs r3,r3,r4
     add r2,r2,#01      //divisible
     cmp r3,r4
     bge loop
     mov r5,r3          //r3 holds quotient
stop b stop

     end




PROGRAM 5:

FINDING FACTORIAL OF NUMBER WITHOUT LOOKUP TABLE

      area fact_wout_lt,code,readonly
entry
      mov r0,#10
      mov r1,#01
back  mul r2,r0,r1
      mov r1,r2
      subs r0,r0,#01
      cmp r0,#00
      bne back
stop  b  stop

      end