MIPS：使用轮询显示角色

Question

我试图在Mars MIPS中显示一个字符（然后最终显示整个字符串，但我现在正处理一个字符）。

.data

.text
main:
    jal emitchar
    jal LOOP
    jal LOOP2

emitchar:
    lui $t0, 0xFFFF         # $t0 stores the address of the receiver control

    jr $ra

LOOP:
    lw $t1, 0($t0)          # $t1 stores the entire 32-bits of the receiver control
    andi $t2, $t1, 0x0001       # $t2 stores the last bit (ready-bit) of the control
    beq $t2, $zero, LOOP        # if the ready-bit is 0 (not ready) loop until it is
    lw $s0, 4($t0)          # load the data into $v0

    jr $ra

LOOP2:
    lw $t1, 8($t0)          # $t1 is the address of transmitter control
    andi $t2, $t1, 0x0001       # $t2 is the ready-but of the transmitter control
    beq $t2, $zero, LOOP2       # if the ready-bit is 0 (not ready) loop until it is
    sw $s0, 12($t0)

    jr $ra

调试时，我注意到我在LOOP过程中遇到了无限循环。关于从哪里去的任何指示？