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- ; NAME dec_bin
- ; PURPOSE converts the decimal number1 to a binary bit pattern in text1
- ; DESIGN
- ; load number1
- ; for i <- 31 down to 0
- ; asl number1
- ; if carry = 1
- ; then
- ; character = '1'
- ; else
- ; character = '0'
- ; endif
- ; place character at end of text1
- ; increment text pointer
- ; end for
- ; place control character at end of text1
-
- ; NOTE
-
- ; r1 stores the address of number to be converted
- ; r4 stores the address of the converted string
- ; r6 is loaded with the number to be converted
- ; r7 is used as a loop counter
- ; r8 holds a '1' or '0' depending on the carry flag
-
-
- ldr r6, [r1]
- mov r7, #31
- .loop
- movs r6, r6, lsl #1
- movcc r8, #48
- movcs r8, #49
- strb r8, [r4]
- add r4, r4, #1
- subs r7, r7, #1
- bpl loop
- mov r8, #0
- strb r8, [r4]
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