Need help with coding assignment in uVision using ARM Assembly:

Have a read$-$only array of eight bytes named Unpacked and a read$/$write integer named Packed. We'll be condensing the Unpacked array into a single integer called Packed where the four most significant bits $($bits $31,30,29,28)$ represent the first

value in Unpacked, the next four bits $($bits $27,26,25,24)$ represent the second value in Unpacked, etc., down to the four least significant bits $(3,2,1,0)$ representing the

final$/$eighth value in the Unpacked array.

You'll achieve this by looping through the Unpacked array and placing the lower four bits of each of the byte values into register three $(r3)$ based upon the following

criteria:

If the byte value is between decimal zero and nine, inclusive, just use the

lowest four bits

If the byte value is anything else, use $0$xF $(2\_1111)$ to represent it in $r3$

Each time through the loop, you'll need to shift r$3$ to make room for the "new" four

bits you'll be adding.

Once the looping is completed, store $r3$ as the Packed integer value.

Below are some example Unpacked arrays and their corresponding Packed integers.

Unpacked dcb $9,8,7,6,5,4,3,2$

; Packed will be $0$x$98765432$

Unpacked dcb $3,2,1,0,12,5,6,9$

; Packed will be $0$x$3210$F$569$

Unpacked dcb $4,13,7,8,10,2,9,-3$

; Packed will be $0$x$4$F$78$F$29$F