root / prex-0.9.0 / bsp / drv / arm / gba / lcd.c @ 03e9c04a
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/*-
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* Copyright (c) 2005-2009, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* lcd.c - GBA LCD video driver
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*/
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#include <driver.h> |
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#include <wscons.h> |
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#include "lcd.h" |
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#include "font.h" |
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/* #define DEBUG_LCD 1 */
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#ifdef DEBUG_LCD
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#define DPRINTF(a) printf a
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#else
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#define DPRINTF(a)
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#endif
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struct lcd_softc {
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device_t dev; |
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uint16_t *vram; |
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}; |
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static int lcd_init(struct driver *); |
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static void lcd_cursor(void*, int, int); |
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static void lcd_putc(void *, int, int, int); |
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static void lcd_copyrows(void *,int, int, int); |
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static void lcd_eraserows(void *,int, int); |
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static void lcd_set_attr(void *, int); |
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static void lcd_get_cursor(void *, int *, int *); |
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static struct devops lcd_devops = { |
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/* open */ no_open,
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/* close */ no_close,
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/* read */ no_read,
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/* write */ no_write,
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/* ioctl */ no_ioctl,
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/* devctl */ no_devctl,
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}; |
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struct driver lcd_driver = {
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/* name */ "lcd", |
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/* devops */ &lcd_devops,
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/* devsz */ sizeof(struct lcd_softc), |
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/* flags */ 0, |
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/* probe */ NULL, |
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/* init */ lcd_init,
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/* shutdown */ NULL, |
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}; |
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static struct wscons_video_ops wscons_lcd_ops = { |
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lcd_cursor, /* cursor */
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lcd_putc, /* putc */
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lcd_copyrows, /* copyrows */
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lcd_eraserows, /* eraserows */
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lcd_set_attr, /* set_attr */
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lcd_get_cursor, /* get_cursor */
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}; |
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static void |
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lcd_cursor(void *aux, int row, int col) |
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{ |
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/* DO NOTHING */
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} |
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static void |
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lcd_putc(void *aux, int row, int col, int ch) |
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{ |
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struct lcd_softc *sc = aux;
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sc->vram[row * VSCR_COLS + col] = ch; |
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} |
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static void |
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lcd_copyrows(void *aux, int srcrow, int dstrow, int nrows) |
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{ |
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struct lcd_softc *sc = aux;
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int i;
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for (i = 0; i < nrows * VSCR_COLS; i++) { |
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sc->vram[dstrow * VSCR_COLS + i] = |
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sc->vram[srcrow * VSCR_COLS + i]; |
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} |
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} |
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static void |
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lcd_eraserows(void *aux, int row, int nrows) |
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{ |
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struct lcd_softc *sc = aux;
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int i, start, end;
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start = row * VSCR_COLS; |
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end = start + nrows * VSCR_COLS; |
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for (i = start; i < end; i++)
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sc->vram[i] = ' ';
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} |
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static void |
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lcd_set_attr(void *aux, int attr) |
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{ |
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/* DO NOTHING */
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} |
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static void |
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lcd_get_cursor(void *aux, int *col, int *row) |
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{ |
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*col = 0;
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*row = 0;
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} |
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static void |
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lcd_init_font(void)
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{ |
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int i, row, col, bit, val = 0; |
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uint16_t *tile = CONSOLE_TILE; |
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for (i = 0; i < 128; i++) { |
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for (row = 0; row < 8; row++) { |
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for (col = 7; col >= 0; col--) { |
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bit = (font_bitmap[i][row] & (1 << col)) ? 2 : 1; |
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if (col % 2) |
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val = bit; |
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else
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tile[(i * 32) + (row * 4) + ((7 - col) / 2)] = |
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val + (bit << 8);
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} |
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} |
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} |
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} |
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static void |
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lcd_init_screen(void)
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{ |
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uint16_t *pal = BG_PALETTE; |
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/* Initialize palette */
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pal[0] = 0; /* Transparent */ |
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pal[1] = RGB(0,0,0); /* Black */ |
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pal[2] = RGB(31,31,31); /* White */ |
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/* Setup lcd */
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REG_BG3CNT = 0x1080; /* Size0, 256color, priority0 */ |
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REG_DISPCNT = 0x0800; /* Mode0, BG3 */ |
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} |
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static int |
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lcd_init(struct driver *self)
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{ |
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device_t dev; |
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struct lcd_softc *sc;
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dev = device_create(self, "lcd", D_CHR|D_TTY);
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sc = device_private(dev); |
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sc->vram = CONSOLE_MAP; |
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lcd_init_font(); |
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lcd_init_screen(); |
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wscons_attach_video(&wscons_lcd_ops, sc); |
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return 0; |
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} |