Question $16$: ASCII Hex String to Binary Word

Write a subroutine that takes the address of a string of eight ASCII characters in R$0.$ It should convert

the hexadecimal string into a $32-$bit binary number, which it return is R$0.$

$$ Use the associated test file to see the string you must operate on$.$ What is listed here is for explanotery purpose only.

Sample Problem:

Input: R$0$ String

STRING $42`$B$\text{'}$

$32`2\text{'}$

$46`$F$\text{'}$

$30`0\text{'}$

Output: R$00000$B$2$F$0$

USING cpulator ARMv$7$