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https://opencores.org/ocsvn/eco32/eco32/trunk
Subversion Repositories eco32
[/] [eco32/] [trunk/] [hwtests/] [serial/] [pc2fpga/] [receive1.s] - Rev 39
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; ; receive.s -- receive & check a stream of bytes ; ; $8 serial base address ; $9 temporary value ; $10 current character ; $11 previous character ; $12 counter ; $13 error ; $31 return address .set tba,0xF0300010 add $8,$0,tba add $12,$0,100000 add $13,$0,0 jal in add $11,$10,0 sub $12,$12,1 loop: add $11,$11,1 and $11,$11,0xFF jal in beq $10,$11,chrok add $13,$13,1 chrok: sub $12,$12,1 bne $12,$0,loop bne $13,$0,error add $13,$0,'.' jal out j halt error: add $13,$0,'?' jal out j halt halt: j halt in: ldw $9,$8,0 and $9,$9,1 beq $9,$0,in ldw $10,$8,4 jr $31 out: ldw $9,$8,8 and $9,$9,1 beq $9,$0,out stw $13,$8,12 jr $31
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