blob: a29345c6ba11c7d3527b4e2c42747b420e081d4d [file] [log] [blame]
Wolfgang Denk9f96ae42005-08-30 13:04:12 +02001/*
2 * (C) Copyright 2005
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25#include <command.h>
26
Wolfgang Denk9f96ae42005-08-30 13:04:12 +020027#undef DEBUG_DISP
28
29#define DISP_SIZE 8
30#define CWORD_CLEAR 0x80
31#define CLEAR_DELAY (110 * 2)
32
33int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
34{
35 int i;
36 int pos;
37
38 /* Clear display */
39 *((volatile char*)(CFG_DISP_CWORD)) = CWORD_CLEAR;
40 udelay(1000 * CLEAR_DELAY);
41
42 if (argc < 2)
43 return (0);
44
45 for (pos = 0, i = 1; i < argc && pos < DISP_SIZE; i++) {
46 char *p = argv[i], c;
47
48 if (i > 1) {
49 *((volatile uchar *) (CFG_DISP_CHR_RAM + pos++)) = ' ';
50#ifdef DEBUG_DISP
51 putc(' ');
52#endif
53 }
54
55 while ((c = *p++) != '\0' && pos < DISP_SIZE) {
56 *((volatile uchar *) (CFG_DISP_CHR_RAM + pos++)) = c;
57#ifdef DEBUG_DISP
58 putc(c);
59#endif
60 }
61 }
62
63#ifdef DEBUG_DISP
64 putc('\n');
65#endif
66
67 return (0);
68}
69
70/***************************************************/
71
72U_BOOT_CMD(
73 display, CFG_MAXARGS, 1, do_display,
74 "display- display string on dot matrix display\n",
75 "[<string>]\n"
76 " - with <string> argument: display <string> on dot matrix display\n"
77 " - without arguments: clear dot matrix display\n"
78);