cmd_display.c 1.9 KB

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  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. #include <common.h>
  24. #include <command.h>
  25. #undef DEBUG_DISP
  26. #define DISP_SIZE 8
  27. #define CWORD_CLEAR 0x80
  28. #define CLEAR_DELAY (110 * 2)
  29. int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  30. {
  31. int i;
  32. int pos;
  33. /* Clear display */
  34. *((volatile char*)(CONFIG_SYS_DISP_CWORD)) = CWORD_CLEAR;
  35. udelay(1000 * CLEAR_DELAY);
  36. if (argc < 2)
  37. return (0);
  38. for (pos = 0, i = 1; i < argc && pos < DISP_SIZE; i++) {
  39. char *p = argv[i], c;
  40. if (i > 1) {
  41. *((volatile uchar *) (CONFIG_SYS_DISP_CHR_RAM + pos++)) = ' ';
  42. #ifdef DEBUG_DISP
  43. putc(' ');
  44. #endif
  45. }
  46. while ((c = *p++) != '\0' && pos < DISP_SIZE) {
  47. *((volatile uchar *) (CONFIG_SYS_DISP_CHR_RAM + pos++)) = c;
  48. #ifdef DEBUG_DISP
  49. putc(c);
  50. #endif
  51. }
  52. }
  53. #ifdef DEBUG_DISP
  54. putc('\n');
  55. #endif
  56. return (0);
  57. }
  58. /***************************************************/
  59. U_BOOT_CMD(
  60. display, CONFIG_SYS_MAXARGS, 1, do_display,
  61. "display string on dot matrix display",
  62. "[<string>]\n"
  63. " - with <string> argument: display <string> on dot matrix display\n"
  64. " - without arguments: clear dot matrix display"
  65. );