58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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* Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com>
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* Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <common.h>
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#include <led-display.h>
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#include <asm/io.h>
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#ifdef CONFIG_CMD_DISPLAY
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#define CWORD_CLEAR 0x80
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#define CLEAR_DELAY (110 * 2)
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#define DISPLAY_SIZE 8
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static int pos; /* Current display position */
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/* Handle different display commands */
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void display_set(int cmd)
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{
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if (cmd & DISPLAY_CLEAR) {
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out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR);
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udelay(1000 * CLEAR_DELAY);
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}
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if (cmd & DISPLAY_HOME) {
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pos = 0;
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}
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}
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/*
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* Display a character at the current display position.
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* Characters beyond the display size are ignored.
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*/
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int display_putc(char c)
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{
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if (pos >= DISPLAY_SIZE)
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return -1;
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out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c);
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return c;
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}
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#endif
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