common/cmd_display.c

   1 /*
   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 #include <led-display.h>
  27
  28 #undef DEBUG_DISP
  29
  30 int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  31 {
  32         int i;
  33
  34         /* Clear display */
  35         display_set(DISPLAY_CLEAR | DISPLAY_HOME);
  36
  37         if (argc < 2)
  38                 return (0);
  39
  40         for (i = 1; i < argc; i++) {
  41                 char *p = argv[i];
  42
  43                 if (i > 1) { /* Insert a space between strings */
  44                         display_putc(' ');
  45                 }
  46
  47                 while ((*p)) {
  48 #ifdef DEBUG_DISP
  49                         putc(*p);
  50 #endif
  51                         display_putc(*p++);
  52                 }
  53         }
  54
  55 #ifdef DEBUG_DISP
  56         putc('\n');
  57 #endif
  58
  59         return (0);
  60 }
  61
  62 /***************************************************/
  63
  64 U_BOOT_CMD(
  65         display,        CONFIG_SYS_MAXARGS,     1,      do_display,
  66         "display string on dot matrix display",
  67         "[<string>]\n"
  68         "    - with <string> argument: display <string> on dot matrix display\n"
  69         "    - without arguments: clear dot matrix display"
  70 );