git.y1.nz

commit bbfde1a7cd6eb70e978b9f7bb4f1f379a8a1cb7d
parent a3f9fde586c6de3bbc8012a2d99442f3582745bd
Author: Toxa <untoxa@mail.ru>
Date:   Sun,  5 Sep 2021 22:09:36 +0300

SMS/GG: clear VRAM in crt0

Diffstat:
M
gbdk-lib/libc/targets/z80/crt0.s
15
+++++++++++++++
M
gbdk-lib/libc/targets/z80/font.s
8
--------
M
gbdk-lib/libc/targets/z80/putchar.s
2
--

3 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/gbdk-lib/libc/targets/z80/crt0.s b/gbdk-lib/libc/targets/z80/crt0.s
@@ -98,6 +98,21 @@ _WRITE_VDP_DATA::
 4$:
         ld (#__SYSTEM), a
 
+        ld a, #<.VDP_VRAM
+        out (#.VDP_CMD), a
+        ld a, #>.VDP_VRAM
+        out (#.VDP_CMD), a
+        xor a
+        ld bc, #0x4101
+        jr 6$
+5$:
+        out (.VDP_DATA), a
+6$:
+        dec c
+        jr nz, 5$
+        dec b
+        jr nz, 5$
+
         call _set_default_palette
 
         ei                      ; re-enable interrupts before going to main()
diff --git a/gbdk-lib/libc/targets/z80/font.s b/gbdk-lib/libc/targets/z80/font.s
@@ -4,7 +4,6 @@
         .module FontUtils
 
         .globl  .memset_small
-        .globl  _cls
         .globl  _font_ibm
 
         ; Structure offsets
@@ -69,13 +68,6 @@ _font_init::
         ld c, #(sfont_handle_sizeof*.MAX_FONTS)
         call .memset_small
 
-        ld a, #3
-        ld (.fg_colour), a
-        xor a
-        ld (.bg_colour), a
-
-        call _cls
-
         ret
 
 _font_set::
diff --git a/gbdk-lib/libc/targets/z80/putchar.s b/gbdk-lib/libc/targets/z80/putchar.s
@@ -4,7 +4,6 @@
         .module putchar
 
         .globl  font_current, font_set, font_load_ibm
-        .globl  _cls
         .globl  .scroll_viewport
 
         ; Structure offsets
@@ -50,7 +49,6 @@ _putchar::
         jr nz, 6$
         
         push de
-        call _cls
         call font_load_ibm
         ld a, h
         or l

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