Question: 12.27 A memory-mapped input device in an ARM environment returns a 32-bit, four-byte value in the order ABCD. The processor needs the byte in the

12.27

A memory-mapped input device in an ARM environment returns a 32-bit, four-byte value in the order ABCD. The processor needs the byte in the order DCBA. Write a fragment of ARM code to perform the transformation.

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