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8-bit One's Complement

8-bit One's Complement

(OP)
Hi, I'm new to assembly and I was hoping someone could help me start a program I'm working on in ARM assembly language. It takes in a file (called udp.dat, with whatever in it) and performs an 8-bit one's compliment checksum of the data, then prints out the hexadecimal number. Any help would be very much appreciated.

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