NanoPayload

Annotated stage2/lcd.c

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2015-06-23 Paul Boddie file changeset files shortlog Attempted to add support for interrupts, although this does not currently work. Some handlers have been added, and minimal handlers to branch to them should be installed in the appropriate addresses utilised by the CPU. The program itself should gradually plot the test pattern but be interrupted and configured to draw clear regions periodically. stage2-non-pic
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/*
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 * Ben NanoNote LCD initialisation, based on uboot-xburst and xburst-tools.
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 *
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 * Copyright (C) 2001-2002 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
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 * Copyright (C) 2015 Paul Boddie <paul@boddie.org.uk>
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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#ifdef CONFIG_CPU_JZ4730_MINIPC
 
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#include "minipc_claa070vc01.h"
 
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#include "minipc.h"
 
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#else
 
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#include "nanonote_gpm940b0.h"
 
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#include "nanonote.h"
 
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#endif
 
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#include "xburst_types.h"
 
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#include "jzlcd.h"
 
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#include "sdram.h"
 
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#include "board.h"
 
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extern vidinfo_t panel_info;
 
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static void *lcd_base;
 
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void test_pixel(unsigned short h, unsigned short v)
 
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{
 
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	unsigned short v_max  = panel_info.vl_row;
 
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	unsigned short h_max  = panel_info.vl_col;
 
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	u32 *pix = (u32 *)lcd_base + v * h_max + h;
 
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	/* NOTE: Code assumes 32 bits/pixel. */
 
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	*pix = (
 
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		(((255 * (h_max - h)) / (h_max - 1)) << 16) +
 
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		((((255 * h) / (h_max - 1) + (255 * (v_max - v)) / (v_max - 1)) / 2) << 8) +
 
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		((255 * v) / (v_max - 1))
 
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		);
 
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}
 
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void clear_pixel(unsigned short h, unsigned short v)
 
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{
 
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	unsigned short h_max  = panel_info.vl_col;
 
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	u32 *pix = (u32 *)lcd_base + v * h_max + h;
 
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	*pix = 0;
 
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}
 
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static void test_pattern(void *lcd_base)
 
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{
 
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	unsigned short v_max  = panel_info.vl_row;
 
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	unsigned short h_max  = panel_info.vl_col;
 
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	unsigned short v, h;
 
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	for (v = 0; v < v_max; v += 1) {
 
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		for (h = 0; h < h_max; h += 1) {
 
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			test_pixel(h, v);
 
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		}
 
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	}
 
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}
 
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void lcd_clear(void *lcd_base)
 
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{
 
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	unsigned short v_max  = panel_info.vl_row;
 
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	unsigned short h_max  = panel_info.vl_col;
 
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	unsigned short v, h;
 
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	u32 *pix = (u32 *)lcd_base;
 
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	for (v = 0; v < v_max; v += 1) {
 
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		for (h = 0; h < h_max; h += 1) {
 
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			*pix++ = 0;
 
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		}
 
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	}
 
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}
 
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/* LCD initialisation. */
 
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void lcd_init(void)
 
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{
 
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	__lcd_display_pin_init();
 
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	__lcd_display_on();
 
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	lcd_ctrl_init(&lcd_base);
 
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	lcd_clear(lcd_base);
 
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	lcd_enable();
 
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}