OpenCores
URL https://opencores.org/ocsvn/eco32/eco32/trunk

Subversion Repositories eco32

[/] [eco32/] [trunk/] [hwtests/] [serial/] [pc2fpga/] [receive0.s] - Blame information for rev 60

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 14 hellwig 
;
2 
; receive.s -- receive & check a stream of bytes
3 
;
4 
 
5 
; $8  serial base address
6 
; $9  temporary value
7 
; $10 current character
8 
; $11 previous character
9 
; $12 counter
10 
; $13 error
11 
; $31 return address
12 
 
13 
        .set    tba,0xF0300000
14 
 
15 
        add     $8,$0,tba
16 
        add     $12,$0,100000
17 
        add     $13,$0,0
18 
        jal     in
19 
        add     $11,$10,0
20 
        sub     $12,$12,1
21 
loop:
22 
        add     $11,$11,1
23 
        and     $11,$11,0xFF
24 
        jal     in
25 
        beq     $10,$11,chrok
26 
        add     $13,$13,1
27 
chrok:
28 
        sub     $12,$12,1
29 
        bne     $12,$0,loop
30 
        bne     $13,$0,error
31 
        add     $13,$0,'.'
32 
        jal     out
33 
        j       halt
34 
error:
35 
        add     $13,$0,'?'
36 
        jal     out
37 
        j       halt
38 
 
39 
halt:
40 
        j       halt
41 
 
42 
in:
43 
        ldw     $9,$8,0
44 
        and     $9,$9,1
45 
        beq     $9,$0,in
46 
        ldw     $10,$8,4
47 
        jr      $31
48 
 
49 
out:
50 
        ldw     $9,$8,8
51 
        and     $9,$9,1
52 
        beq     $9,$0,out
53 
        stw     $13,$8,12
54 
        jr      $31

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.