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
  27 #if (CONFIG_COMMANDS & CFG_CMD_DISPLAY)
  28
  29 #undef DEBUG_DISP
  30
  31 #define DISP_SIZE       8
  32 #define CWORD_CLEAR     0x80
  33 #define CLEAR_DELAY     (110 * 2)
  34
  35 int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  36 {
  37         int i;
  38         int pos;
  39
  40         /* Clear display */
  41         *((volatile char*)(CFG_DISP_CWORD)) = CWORD_CLEAR;
  42         udelay(1000 * CLEAR_DELAY);
  43
  44         if (argc < 2)
  45                 return (0);
  46
  47         for (pos = 0, i = 1; i < argc && pos < DISP_SIZE; i++) {
  48                 char *p = argv[i], c;
  49
  50                 if (i > 1) {
  51                         *((volatile uchar *) (CFG_DISP_CHR_RAM + pos++)) = ' ';
  52 #ifdef DEBUG_DISP
  53                         putc(' ');
  54 #endif
  55                 }
  56
  57                 while ((c = *p++) != '\0' && pos < DISP_SIZE) {
  58                         *((volatile uchar *) (CFG_DISP_CHR_RAM + pos++)) = c;
  59 #ifdef DEBUG_DISP
  60                         putc(c);
  61 #endif
  62                 }
  63         }
  64
  65 #ifdef DEBUG_DISP
  66         putc('\n');
  67 #endif
  68
  69         return (0);
  70 }
  71
  72 /***************************************************/
  73
  74 U_BOOT_CMD(
  75         display,        CFG_MAXARGS,    1,      do_display,
  76         "display- display string on dot matrix display\n",
  77         "[<string>]\n"
  78         "    - with <string> argument: display <string> on dot matrix display\n"
  79         "    - without arguments: clear dot matrix display\n"
  80 );
  81
  82 #endif  /* CFG_CMD_DISPLAY */