From fd6bb20116127f6ac903d4b03abac72a49baa1ae Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Sat, 27 Apr 2019 22:20:21 +0100
Subject: fish

---
 datalink_macros.h | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 datalink_macros.h

(limited to 'datalink_macros.h')

diff --git a/datalink_macros.h b/datalink_macros.h
new file mode 100644
index 0000000..8dbc9b4
--- /dev/null
+++ b/datalink_macros.h
@@ -0,0 +1,100 @@
+/* 
+ * Copyright 1996-2002 - Karl R. Hakimian and David Fries
+ *
+ * This file is part of datalink.
+ *
+ * Datalink is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Datalink is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with datalink (see COPYING); if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/*
+ * SVGA Macros for sending data to the datalink watch.
+ *
+ * Modified by David Fries <dfries@mail.win.org> 7/11/99
+ * - Added support for the Timex Datalink Ironman Triathlon
+ * - Modified the screen position and only send half the initial sync signals
+ *
+ */
+
+// This defines which line to start field 1 at
+#define START1 70
+// The line to start field 2 at
+#define START2 255
+// the distance between lines in each field
+#define SPACE 15
+
+#define WRITE_BYTE1(sb, byte) { \
+	int pos = START1; \
+	register int mask = 0x1; \
+	if (sb) \
+		vga_drawscanline(pos, white); \
+	else \
+		vga_drawscanline(pos, black); \
+	pos += SPACE; \
+	while (mask < 0xff) { \
+		if (mask&byte) \
+			vga_drawscanline(pos, black); \
+		else \
+			vga_drawscanline(pos, white); \
+		pos += SPACE; \
+		mask = mask << 1; \
+	} \
+}
+
+#define WRITE_BYTE2(sb, byte) { \
+	int pos = START2; \
+	register int mask = 1; \
+	if (sb) \
+		vga_drawscanline(pos, white); \
+	else \
+		vga_drawscanline(pos, black); \
+	pos += SPACE; \
+	while (mask < 0xff) { \
+		if (mask&byte) \
+			vga_drawscanline(pos, black); \
+		else \
+			vga_drawscanline(pos, white); \
+		pos += SPACE; \
+		mask = mask << 1; \
+	} \
+}
+
+#define END_PACKET { \
+	vga_waitretrace(); \
+	WRITE_BYTE1(0, 0xff) \
+	WRITE_BYTE2(0, 0xff) \
+	{int i; for (i = 0; i < (10+((type==DATALINK_IRONMAN)?2:0)); i++) \
+		vga_waitretrace();} \
+}
+
+/* how many syncs to give to begin with, was 400 */
+#define SYNC { \
+	register int i; \
+	for (i = 0; i < 200; i++) { \
+		vga_waitretrace(); \
+		WRITE_BYTE1(1, 0x55) \
+		WRITE_BYTE2(1, 0x55) \
+	} \
+	END_PACKET \
+}
+
+#define DATASTART { \
+	register int i; \
+	for (i = 0; i < 50; i++) { \
+		vga_waitretrace(); \
+		WRITE_BYTE1(1, 0xAA) \
+	} \
+	END_PACKET \
+}
-- 
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