Annotation of prex-old/sys/arch/arm/gba/diag.c, Revision 1.1
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:
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