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[/] [tv80/] [trunk/] [tests/] [basic_int.asm] - Blame information for rev 84

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Line No. Rev Author Line
1 2 ghutchis 
        .module basic_int
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test_ctl_port     = 0x80
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print_port        = 0x81
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int_timeout_port  = 0x90
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        .area BOOT_VEC
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        jp      main
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        .area INT_VEC
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int_entry:
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        exx
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        ld      b, a
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        ld      hl, #int_seen_str
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print_str:
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        ld      a, (hl)
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        cp      #0
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        jp      z, print_str_exit
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        out     (print_port), a
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        inc     hl
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        jp      print_str
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print_str_exit:
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        ld      a, b
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        exx
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        ld      h, #1
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        reti
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        .area _CODE
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main:
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        ld      h,  #0
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        ld      bc, #100
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        ld      a, #50
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        out     (int_timeout_port), a
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test_timeout_loop:
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        ld      a, #1
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        cp      h
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        jp      z, test_pass
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        dec     bc
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        jp      nz, test_timeout_loop
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test_fail:
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        ld      a, #2
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        out     (test_ctl_port), a
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        .db     0x76            ; hlt
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test_pass:
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        ld      a, #1
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        out (test_ctl_port), a
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        .db     0x76            ; hlt
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        .area _DATA
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int_seen_str:
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        .ascii "Interrupt asserted"
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        .db    0x0a
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        .db    0x00

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