83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
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* (C) Copyright 2005
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#if (CONFIG_COMMANDS & CFG_CMD_DISPLAY)
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#undef DEBUG_DISP
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#define DISP_SIZE 8
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#define CWORD_CLEAR 0x80
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#define CLEAR_DELAY (110 * 2)
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int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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int i;
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int pos;
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/* Clear display */
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*((volatile char*)(CFG_DISP_CWORD)) = CWORD_CLEAR;
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udelay(1000 * CLEAR_DELAY);
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if (argc < 2)
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return (0);
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for (pos = 0, i = 1; i < argc && pos < DISP_SIZE; i++) {
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char *p = argv[i], c;
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if (i > 1) {
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*((volatile uchar *) (CFG_DISP_CHR_RAM + pos++)) = ' ';
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#ifdef DEBUG_DISP
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putc(' ');
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#endif
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}
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while ((c = *p++) != '\0' && pos < DISP_SIZE) {
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*((volatile uchar *) (CFG_DISP_CHR_RAM + pos++)) = c;
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#ifdef DEBUG_DISP
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putc(c);
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#endif
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}
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}
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#ifdef DEBUG_DISP
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putc('\n');
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#endif
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return (0);
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}
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/***************************************************/
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U_BOOT_CMD(
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display, CFG_MAXARGS, 1, do_display,
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"display- display string on dot matrix display\n",
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"[<string>]\n"
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" - with <string> argument: display <string> on dot matrix display\n"
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" - without arguments: clear dot matrix display\n"
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);
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#endif /* CFG_CMD_DISPLAY */
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