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| author | Juan J. Martinez <jjm@usebox.net> | 2020-12-30 19:07:31 +0000 |
|---|---|---|
| committer | Juan J. Martinez <jjm@usebox.net> | 2020-12-30 19:23:41 +0000 |
| commit | 2682bc5d1d864341aaeb42a449db73c3ecd16d70 (patch) | |
| tree | 9116764364b4ee0ce7f6037305077807b57776de /src/ubox/ubox_select_ctl.z80 | |
| download | ubox-msx-lib-2682bc5d1d864341aaeb42a449db73c3ecd16d70.tar.gz ubox-msx-lib-2682bc5d1d864341aaeb42a449db73c3ecd16d70.zip | |
Initial import1.0
Diffstat (limited to 'src/ubox/ubox_select_ctl.z80')
| -rw-r--r-- | src/ubox/ubox_select_ctl.z80 | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/ubox/ubox_select_ctl.z80 b/src/ubox/ubox_select_ctl.z80 new file mode 100644 index 0000000..9685bec --- /dev/null +++ b/src/ubox/ubox_select_ctl.z80 @@ -0,0 +1,42 @@ +.globl _ubox_select_ctl + +GTTRIG = 0x00d8 + +_ubox_select_ctl:: + ld b, #3 +loop: + ld a, b + dec a + push bc + call GTTRIG + pop bc + or a + jr nz, trigger + djnz loop + + ; 2nd button + + ld b, #4 + ld a, b + push bc + call GTTRIG + pop bc + or a + jr nz, trigger_b + + dec b + ld a, b + push bc + call GTTRIG + pop bc + or a + jr nz, trigger_b + + ld l, #0xff + ret +trigger_b: + dec b +trigger: + dec b + ld l, b + ret |