| Ilya Yanok | 7f0d241 | 2010-09-09 23:03:32 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com> |
| 3 | * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| 17 | * MA 02110-1301, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <common.h> |
| 21 | #include <led-display.h> |
| 22 | #include <asm/io.h> |
| 23 | |
| 24 | #ifdef CONFIG_CMD_DISPLAY |
| 25 | #define CWORD_CLEAR 0x80 |
| 26 | #define CLEAR_DELAY (110 * 2) |
| 27 | #define DISPLAY_SIZE 8 |
| 28 | |
| 29 | static int pos; /* Current display position */ |
| 30 | |
| 31 | /* Handle different display commands */ |
| 32 | void display_set(int cmd) |
| 33 | { |
| 34 | if (cmd & DISPLAY_CLEAR) { |
| 35 | out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR); |
| 36 | udelay(1000 * CLEAR_DELAY); |
| 37 | } |
| 38 | |
| 39 | if (cmd & DISPLAY_HOME) { |
| 40 | pos = 0; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * Display a character at the current display position. |
| 46 | * Characters beyond the display size are ignored. |
| 47 | */ |
| 48 | int display_putc(char c) |
| 49 | { |
| 50 | if (pos >= DISPLAY_SIZE) |
| 51 | return -1; |
| 52 | |
| 53 | out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c); |
| 54 | |
| 55 | return c; |
| 56 | } |
| 57 | #endif |