Merge pull request #2508 from polluks/waitvsync

[ATMOS] waitvsync
2024-09-08 16:14:51 +02:00
parent 3a7f0e2d18 be5a9f92ec
commit 0be5f8f9e1
3 changed files with 24 additions and 0 deletions
--- a/libsrc/atmos/waitvsync.s
+++ b/libsrc/atmos/waitvsync.s
@@ -0,0 +1,18 @@
+;
+; Written by Stefan Haubenthal <polluks@sdf.org>, requires VSync hack
+;
+; void waitvsync (void);
+;
+
+        .export _waitvsync
+
+        .include "atmos.inc"
+
+.proc   _waitvsync
+
+        lda     #%00010000      ; CB1
+wait:   and     VIA::PRA2
+        bne     wait
+        rts
+
+.endproc