From 2682bc5d1d864341aaeb42a449db73c3ecd16d70 Mon Sep 17 00:00:00 2001 From: "Juan J. Martinez" Date: Wed, 30 Dec 2020 19:07:31 +0000 Subject: Initial import --- src/ubox/ubox_wait.z80 | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 src/ubox/ubox_wait.z80 (limited to 'src/ubox/ubox_wait.z80') diff --git a/src/ubox/ubox_wait.z80 b/src/ubox/ubox_wait.z80 new file mode 100644 index 0000000..49fd0be --- /dev/null +++ b/src/ubox/ubox_wait.z80 @@ -0,0 +1,23 @@ +.globl _ubox_wait +.globl ubox_isr_wait_ticks +.globl ubox_isr_wait_tick + +_ubox_wait:: + ld hl, #ubox_isr_wait_tick + ld a, (ubox_isr_wait_ticks) + ld c, a + +wait_loop: + ld a, (hl) + cp c + jr nc, wait_done + halt + jr wait_loop + +wait_done: + xor a + di + ld (hl), a + ei + ret + -- cgit v1.2.3