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Subversion Repositories eco32

[/] [eco32/] [trunk/] [hwtests/] [serial/] [pc2fpga/] [receive1.s] - Blame information for rev 14

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Line No. Rev Author Line
1 14 hellwig 
;
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; receive.s -- receive & check a stream of bytes
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;
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; $8  serial base address
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; $9  temporary value
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; $10 current character
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; $11 previous character
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; $12 counter
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; $13 error
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; $31 return address
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        .set    tba,0xF0300010
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        add     $8,$0,tba
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        add     $12,$0,100000
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        add     $13,$0,0
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        jal     in
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        add     $11,$10,0
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        sub     $12,$12,1
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loop:
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        add     $11,$11,1
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        and     $11,$11,0xFF
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        jal     in
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        beq     $10,$11,chrok
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        add     $13,$13,1
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chrok:
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        sub     $12,$12,1
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        bne     $12,$0,loop
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        bne     $13,$0,error
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        add     $13,$0,'.'
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        jal     out
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        j       halt
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error:
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        add     $13,$0,'?'
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        jal     out
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        j       halt
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halt:
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        j       halt
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in:
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        ldw     $9,$8,0
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        and     $9,$9,1
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        beq     $9,$0,in
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        ldw     $10,$8,4
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        jr      $31
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out:
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        ldw     $9,$8,8
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        and     $9,$9,1
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        beq     $9,$0,out
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        stw     $13,$8,12
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        jr      $31

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