63 lines
859 B
ArmAsm
63 lines
859 B
ArmAsm
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.equ ADDR_BASE, 0xBF88
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.equ TRISE, 0x6100
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.equ LATE, 0x6120
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.equ TRISD, 0x60C0
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.equ LATD, 0x60E0
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.equ READ_CORE_TIMER, 11
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.equ RESET_CORE_TIMER, 12
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.data
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.text
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.globl main
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main:
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lui $t7, ADDR_BASE
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lw $t0, TRISE($t7)
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andi $t0, $t0, 0xFFFE
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sw $t0, TRISE($t7)
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lw $t0, TRISD($t7)
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andi $t0, $t0, 0xFFFE
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sw $t0, TRISD($t7)
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li $t0, 0x0000
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loop:
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lw $t1, LATE($t7)
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andi $t1, $t1, 0xFFFE
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or $t1, $t1, $t0
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sw $t1, LATE($t7)
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lw $t1, LATD($t7)
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andi $t1, $t1, 0xFFFE
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or $t1, $t1, $t0
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sw $t1, LATD($t7)
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addi $sp, $sp, -8
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sw $ra, 0($sp)
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sw $t0, 4($sp)
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li $a0, 500
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jal delay
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lw $ra, 0($sp)
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lw $t0, 4($sp)
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addi $sp, $sp, 8
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xori $t0, $t0, 0x0001
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j loop
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# ----------- DELAY FUNCTION ------------
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delay: li $v0, RESET_CORE_TIMER
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syscall
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wait: li $v0, READ_CORE_TIMER
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syscall
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mul $t0, $a0, 20000
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blt $v0, $t0, wait
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jr $ra
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