From 7fdecfff5dc39c14e7cc02cf38c327284f10cc7d Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Mon, 22 May 2023 12:52:24 +0100
Subject: Write BCD numbers using the bitmap front

---
 game/text.asm | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'game/text.asm')

diff --git a/game/text.asm b/game/text.asm
index 388b0bf..0c7a1e6 100644
--- a/game/text.asm
+++ b/game/text.asm
@@ -93,3 +93,54 @@ put_text_c:
     ld y, 3
     port b, y
     ret
+
+;
+; in: [a : x]: number
+;     b, y: (x, y) dst coords
+;     stack: 1 byte digits
+put_bcd_number:
+    push y
+    push b
+
+put_bcd_number_loop:
+    ld y, [a : x]
+    inc x
+    bo
+    inc a
+
+    add y, 16
+
+    push a
+    push x
+
+    rol y, 5
+    ld x, y
+    and x, 31
+    and y, 224
+
+    ld a, >font
+    add a, x
+
+    ld x, <font
+    add x, y
+    bo
+    inc a
+
+    call put_text_c
+
+    pop x
+    pop a
+
+    pop b
+    add b, 4
+    push b
+
+    ld y, [sp + 4]
+    dec y
+    ld [sp + 4], y
+    bnz
+    jmp put_bcd_number_loop
+
+    pop b
+    pop y
+    ret
-- 
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