Question

Problem 5 (15pts): Describe what the following program is doing (Do not need to explain each line of instruction. Just show me the purpose of this code). .equ LEDS, Ox100000 10 # define LEDS Ox10000010 .text global start #base address of LEDS on DEO-Nano start: movia r2, LEDS movi r3, 0b00000001 movi r4, OX7FFF slli r4, r4, 3 add r4, r4, r4 load: movi r5, 0b10000000 loop: stw rs, o(r2) mov r6, ro count: addi r6, r6, 1 bne r6, r4, count beq r5, r3, load roli r5, r5, -1 br loop Problem 6 (10pts): For the following sequence of instructions, (1) show all values corresponding to each register in each line after the instruction in each line is executed. and (2) use one math equation with 4 parameters, A, B, C, and D to describe what calculation in general this following program represents, .equ B, 4 .equ D, 6 .text global start start: movia r2, A Idw r2, 0(r2) movi r3, B movia r4, C Idw r4, O(r4) movi r5, D div r6, r2, r3 mul r7, r4, r5 add r8, r6, r7 movia r9, ANSWER stw r8, ANSWER(rO) Done: br Done .data A: .word 15 C: word 5 ANSWER: word 4

Answer 1

Answer 5:

• This program will initialize all the LED bits then access the address like 0b00001 and value of register 0x7fff and then will shift left immediately.
• Then add that value and this will turn on the LED then after that it will access the address 0b0001.
• Then increment each value till of branch not equal and will lighten the LED's and if the branch is equal.
• Then it will off the LED's again load the address and will repeat the process.