common/cmd_terminal.c

   1 /*
   2  * (C) Copyright 2007 OpenMoko, Inc.
   3  * Written by Harald Welte <laforge@openmoko.org>
   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 /*
  25  * Boot support
  26  */
  27 #include <common.h>
  28 #include <command.h>
  29 #include <devices.h>
  30
  31 int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char *argv[])
  32 {
  33         int i, l;
  34         int last_tilde = 0;
  35         device_t *dev = NULL;
  36
  37         if (argc < 1)
  38                 return -1;
  39
  40         /* Scan for selected output/input device */
  41         for (i = 1; i <= ListNumItems (devlist); i++) {
  42                 device_t *tmp = ListGetPtrToItem (devlist, i);
  43                 if (!strcmp(tmp->name, argv[1])) {
  44                         dev = tmp;
  45                         break;
  46                 }
  47         }
  48         if (!dev)
  49                 return -1;
  50
  51         serial_reinit_all();
  52         printf("Entering terminal mode for port %s\n", dev->name);
  53         puts("Use '~.' to leave the terminal and get back to u-boot\n");
  54
  55         while (1) {
  56                 int c;
  57
  58                 /* read from console and display on serial port */
  59                 if (stdio_devices[0]->tstc()) {
  60                         c = stdio_devices[0]->getc();
  61                         if (last_tilde == 1) {
  62                                 if (c == '.') {
  63                                         putc(c);
  64                                         putc('\n');
  65                                         break;
  66                                 } else {
  67                                         last_tilde = 0;
  68                                         /* write the delayed tilde */
  69                                         dev->putc('~');
  70                                         /* fall-through to print current
  71                                          * character */
  72                                 }
  73                         }
  74                         if (c == '~') {
  75                                 last_tilde = 1;
  76                                 puts("[u-boot]");
  77                                 putc(c);
  78                         }
  79                         dev->putc(c);
  80                 }
  81
  82                 /* read from serial port and display on console */
  83                 if (dev->tstc()) {
  84                         c = dev->getc();
  85                         putc(c);
  86                 }
  87         }
  88         return 0;
  89 }
  90
  91
  92 /***************************************************/
  93
  94 U_BOOT_CMD(
  95         terminal,       3,      1,      do_terminal,
  96         "terminal - start terminal emulator\n",
  97         ""
  98 );