Verify_Read.S

# ************************************************************* #
# ECE 344L - Microprocessors - Spring 2015
#
# Name: Matthew Greci and Mitchell Jackson
#
#     Laboratory Number: 6             Due Date: 7 May 2015
#
#
# Lab Group: Matthew Greci and Mitchell Jackson
#
#
# #*************************************************************** #
# Verifies the input from the user.
# #***************************************************************
#include <p32xxxx.h>
.global verify_read
.data
.text
.set noreorder
.set USER_INPUT, 0xA0000200
.set ELAP_TIME,0xA0000210

.ent verify_read

verify_read:
li s0, 0
or s0, s0, ra

li t2, 0
la t0, USER_INPUT  # base address to store chars

lb t1, 0(t0)
lb t2, 1(t0)
lb t3, 3(t0)
lb t4, 4(t0)

sw zero, 0(t0)
sw zero, 4(t0)

sb t1, 0(t0)
sb t2, 1(t0)
sb t3, 2(t0)
sb t4, 3(t0)

li t5, 36000
addi t1, -0x30
mult t1,t5
mflo t1
li t5, 3600
addi t2, -0x30
mult t2,t5
mflo t2
li t5, 600
addi t3, -0x30
mult t3,t5
mflo t3
li t5, 60
addi t4, -0x30
mult t4,t5
mflo t4

add t1, t1, t2
add t1, t1, t3
add t1, t1, t4

sw t1, 8(t0)
li t2, 0x15144
sw t2, 4(t0)

sub t1, t1, t2
bgtz t1, main       # ask user again
nop

sw zero, 8(ELAP_TIME)

jr s0               # return
nop

.end verify_read