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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: #ifdef CONFIG_DIAG_SCREEN
38: #include "font.h"
39:
40: #define VSCR_COLS 32
41: #define SCR_COLS 30
42: #define SCR_ROWS 20
43:
44: /* Registers for keypad control */
45: #define REG_DISPCNT (*(volatile u_short *)0x4000000)
46: #define REG_BG0CNT (*(volatile u_short *)0x4000008)
47:
48: #define BG_PALETTE (u_short *)0x5000000
49: #define VRAM_TILE (u_short *)0x6000000
50: #define VRAM_MAP (u_short *)0x6008000
51:
52: #define RGB(r, g, b) (((b) << 10) + ((g) << 5) + (r))
53:
54: static u_short *vram = VRAM_MAP;
55: static int pos_x;
56: static int pos_y;
57:
58: static void
59: scroll_up(void)
60: {
61: int i;
62:
63: for (i = 0; i < VSCR_COLS * (SCR_ROWS - 1); i++)
64: vram[i] = vram[i + VSCR_COLS];
65: for (i = 0; i < VSCR_COLS; i++)
66: vram[VSCR_COLS * (SCR_ROWS - 1) + i] = ' ';
67: }
68:
69: static void
70: new_line(void)
71: {
72:
73: pos_x = 0;
74: pos_y++;
75: if (pos_y >= SCR_ROWS) {
76: pos_y = SCR_ROWS - 1;
77: scroll_up();
78: }
79: }
80:
81: static void
82: put_char(char ch)
83: {
84:
85: switch (ch) {
86: case '\n':
87: new_line();
88: return;
89: case '\r':
90: pos_x = 0;
91: return;
92: case '\b':
93: if (pos_x == 0)
94: return;
95: pos_x--;
96: return;
97: }
98:
99: vram[pos_y * VSCR_COLS + pos_x] = ch;
100: pos_x++;
101: if (pos_x >= SCR_COLS) {
102: pos_x = 0;
103: pos_y++;
104: if (pos_y >= SCR_ROWS) {
105: pos_y = SCR_ROWS - 1;
106: scroll_up();
107: }
108: }
109: }
110:
111: /*
112: * Init font
113: */
114: static void
115: init_font(void)
116: {
117: int i, row, col, bit, val = 0;
118: u_short *tile = VRAM_TILE;
119:
120: for (i = 0; i < 256; i++) {
121: for (row = 0; row < 8; row++) {
122: for (col = 7; col >= 0; col--) {
123: bit = (font_bitmap[i][row] & (1 << col)) ? 2 : 1;
124: if (col % 2)
125: val = bit;
126: else
127: tile[(i * 32) + (row * 4) + ((7 - col) / 2)] =
128: val + (bit << 8);
129: }
130: }
131: }
132: }
133:
134: /*
135: * Init screen
136: */
137: static void
138: init_screen(void)
139: {
140: u_short *pal = BG_PALETTE;
141:
142: /* Initialize palette */
143: pal[0] = 0; /* Transparent */
144: pal[1] = RGB(0,0,0); /* Black */
145: pal[2] = RGB(31,31,31); /* White */
146:
147: /* Setup video */
148: REG_DISPCNT = 0x0100; /* Mode0, BG0 */
149: REG_BG0CNT = 0x1080; /* Size0, 256color */
150: }
151: #endif /* CONFIG_DIAG_SCREEN */
152:
153:
154: void
155: diag_print(char *buf)
156: {
157: #ifdef CONFIG_DIAG_SCREEN
158: char *p = buf;
159:
160: while (*p)
161: put_char(*p++);
162: #endif
163:
164: /*
165: * Warning: Enabling CONFIG_DIAG_VBA will cause
166: * hang on actual GBA h/w.
167: */
168: #ifdef CONFIG_DIAG_VBA
169: puts(buf);
170: #endif
171: }
172:
173: #endif /* DEBUG */
174:
175: /*
176: * Init
177: */
178: void
179: diag_init(void)
180: {
181:
182: #ifdef DEBUG
183: #ifdef CONFIG_DIAG_SCREEN
184: init_font();
185: init_screen();
186: #endif
187: #endif
188: }
189: