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1.1 nbrk 1: /*-
2: * Copyright (c) 2005-2006, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * diag.c - GBA screen management
32: */
33: #include <kernel.h>
34:
35: #ifdef DEBUG
36: /*
37: * Warning: Enabling CONFIG_DIAG_VBA will cause hang on actual GBA h/w.
38: */
39: #ifdef CONFIG_DIAG_SCREEN
40: #include "font.h"
41:
42: #define VSCR_COLS 32
43: #define SCR_COLS 30
44: #define SCR_ROWS 20
45:
46: /* Registers for keypad control */
47: #define REG_DISPCNT (*(volatile u_short *)0x4000000)
48: #define REG_BG0CNT (*(volatile u_short *)0x4000008)
49:
50: #define BG_PALETTE (u_short *)0x5000000
51: #define VRAM_TILE (u_short *)0x6000000
52: #define VRAM_MAP (u_short *)0x6008000
53:
54: #define RGB(r, g, b) (((b) << 10) + ((g) << 5) + (r))
55:
56: static u_short *vram = VRAM_MAP;
57: static int pos_x;
58: static int pos_y;
59:
60: static void
61: scroll_up(void)
62: {
63: int i;
64:
65: for (i = 0; i < VSCR_COLS * (SCR_ROWS - 1); i++)
66: vram[i] = vram[i + VSCR_COLS];
67: for (i = 0; i < VSCR_COLS; i++)
68: vram[VSCR_COLS * (SCR_ROWS - 1) + i] = ' ';
69: }
70:
71: static void
72: new_line(void)
73: {
74:
75: pos_x = 0;
76: pos_y++;
77: if (pos_y >= SCR_ROWS) {
78: pos_y = SCR_ROWS - 1;
79: scroll_up();
80: }
81: }
82:
83: static void
84: put_char(char ch)
85: {
86:
87: switch (ch) {
88: case '\n':
89: new_line();
90: return;
91: case '\r':
92: pos_x = 0;
93: return;
94: case '\b':
95: if (pos_x == 0)
96: return;
97: pos_x--;
98: return;
99: }
100:
101: vram[pos_y * VSCR_COLS + pos_x] = ch;
102: pos_x++;
103: if (pos_x >= SCR_COLS) {
104: pos_x = 0;
105: pos_y++;
106: if (pos_y >= SCR_ROWS) {
107: pos_y = SCR_ROWS - 1;
108: scroll_up();
109: }
110: }
111: }
112:
113: /*
114: * Write
115: */
116: void
117: diag_print(char *buf)
118: {
119:
120: while (*buf)
121: put_char(*buf++);
122: }
123:
124: /*
125: * Init font
126: */
127: static void
128: init_font(void)
129: {
130: int i, row, col, bit, val = 0;
131: u_short *tile = VRAM_TILE;
132:
133: for (i = 0; i < 256; i++) {
134: for (row = 0; row < 8; row++) {
135: for (col = 7; col >= 0; col--) {
136: bit = (font_bitmap[i][row] & (1 << col)) ? 2 : 1;
137: if (col % 2)
138: val = bit;
139: else
140: tile[(i * 32) + (row * 4) + ((7 - col) / 2)] =
141: val + (bit << 8);
142: }
143: }
144: }
145: }
146:
147: /*
148: * Init screen
149: */
150: static void
151: init_screen(void)
152: {
153: u_short *pal = BG_PALETTE;
154:
155: /* Initialize palette */
156: pal[0] = 0; /* Transparent */
157: pal[1] = RGB(0,0,0); /* Black */
158: pal[2] = RGB(31,31,31); /* White */
159:
160: /* Setup video */
161: REG_DISPCNT = 0x0100; /* Mode0, BG0 */
162: REG_BG0CNT = 0x1080; /* Size0, 256color */
163: }
164: #endif /* CONFIG_DIAG_SCREEN */
165:
166: #endif /* DEBUG */
167:
168: /*
169: * Init
170: */
171: void
172: diag_init(void)
173: {
174:
175: #ifdef DEBUG
176: #ifdef CONFIG_DIAG_SCREEN
177: init_font();
178: init_screen();
179: #endif
180: #endif
181: }
182: