From 18b3eed7f80a100c31b2b92c9e53c781102e0e90 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sat, 15 Feb 2020 15:52:57 +0000
Subject: add display i/o registers and some display control values.

---
 main.c |  4 ++--
 regs.h | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 65 insertions(+), 11 deletions(-)

diff --git a/main.c b/main.c
index caa0e59..265cf02 100644
--- a/main.c
+++ b/main.c
@@ -1,7 +1,7 @@
 #include "dat.h"
 #include "regs.h"
 
-uint *ioram = (uint*)IORAM;
+ushort *ioram = (ushort*)IORAM;
 ushort *vram = (ushort*)VRAM;
 
 Point
@@ -33,7 +33,7 @@ main()
 {
 	int i, c;
 
-	*ioram = 0x0403;
+	ioram[DISPCNT] = BGMODE3|DISPBG2;
 	for(i = 0; i < SCRH; i++){
 		c = 31*i/SCRH;
 		drawpixel(Pt(i,i), rgb(c,c,c));
diff --git a/regs.h b/regs.h
index 2c93048..ae35acc 100644
--- a/regs.h
+++ b/regs.h
@@ -1,9 +1,63 @@
-#define SYSROM	0x00000000UL
-#define EWRAM	0x02000000UL
-#define IWRAM	0x03000000UL
-#define IORAM	0x04000000UL
-#define PALRAM	0x05000000UL
-#define VRAM	0x06000000UL
-#define OAM	0x07000000UL
-#define PAKROM	0x08000000UL
-#define CART	0x0E000000UL
+/* memory map */
+enum {
+	SYSROM	= 0x00000000,
+	EWRAM	= 0x02000000,
+	IWRAM	= 0x03000000,
+	IORAM	= 0x04000000,
+	PALRAM	= 0x05000000,
+	VRAM	= 0x06000000,
+	OAM	= 0x07000000,
+	PAKROM	= 0x08000000,
+	CART	= 0x0E000000
+};
+/* i/o registers */
+enum {
+	DISPCNT		= 0x00,	/* LCD control */
+		BGMODE0	= 0x0000,
+		BGMODE1 = 0x0001,
+		BGMODE2 = 0x0002,
+		BGMODE3 = 0x0003,
+		BGMODE4 = 0x0004,
+		BGMODE5 = 0x0005,
+		DISPBG0	= 0x0100,
+		DISPBG1	= 0x0200,
+		DISPBG2	= 0x0400,
+		DISPBG3	= 0x0800,
+		DISPOBJ	= 0x1000,
+	DISPSTAT	= 0x04,	/* general LCD status */
+	VCOUNT		= 0x06,
+	BG0CNT		= 0x08,
+	BG1CNT		= 0x0A,
+	BG2CNT		= 0x0C,
+	BG3CNT		= 0x0E,
+	BG0HOFS		= 0x10,
+	BG0VOFS		= 0x12,
+	BG1HOFS		= 0x14,
+	BG1VOFS		= 0x16,
+	BG2HOFS		= 0x18,
+	BG2VOFS		= 0x1A,
+	BG3HOFS		= 0x1C,
+	BG3VOFS		= 0x1E,
+	BG2PA		= 0x20,	/* BG2 Rotation/Scaling Parameter A (dx) */
+	BG2PB		= 0x22,	/* BG2 Rotation/Scaling Parameter B (dmx) */
+	BG2PC		= 0x24,	/* BG2 Rotation/Scaling Parameter C (dy) */
+	BG2PD		= 0x26,	/* BG2 Rotation/Scaling Parameter D (dmy) */
+	BG2X		= 0x28,	/* BG2 Reference Point X-Coordinate */
+	BG2Y		= 0x2C,	/* BG2 Reference Point X-Coordinate */
+	BG3PA		= 0x30,	/* BG3 Rotation/Scaling Parameter A (dx) */
+	BG3PB		= 0x32,	/* BG3 Rotation/Scaling Parameter B (dmx) */
+	BG3PC		= 0x34,	/* BG3 Rotation/Scaling Parameter C (dy) */
+	BG3PD		= 0x36,	/* BG3 Rotation/Scaling Parameter D (dmy) */
+	BG3X		= 0x38,	/* BG3 Reference Point X-Coordinate */
+	BG3Y		= 0x3C,	/* BG3 Reference Point Y-Coordinate */
+	WIN0H		= 0x40,	/* Window 0 Horizontal Dimensions */
+	WIN1H		= 0x42,	/* Window 1 Horizontal Dimensions */
+	WIN0V		= 0x44, /* Window 0 Vertical Dimensions */
+	WIN1V		= 0x46,	/* Window 1 Vertical Dimensions */
+	WININ		= 0x48,	/* Inside of Window 0 and 1 */
+	WINOUT		= 0x4A,	/* Inside of OBJ Window & Outside of Windows */
+	MOSAIC		= 0x4C,	/* Mosaic Size */
+	BLDCNT		= 0x50,	/* Color Special Effects Selection */
+	BLDALPHA	= 0x52,	/* Alpha Blending Coefficients */
+	BLDY		= 0x54	/* Brightness (Fade-In/Out) Coefficient */
+};
-- 
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