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 #include <serial.h>
  31
  32 int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char *argv[])
  33 {
  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         dev = device_get_by_name(argv[1]);
  42         if (!dev)
  43                 return -1;
  44
  45         serial_reinit_all();
  46         printf("Entering terminal mode for port %s\n", dev->name);
  47         puts("Use '~.' to leave the terminal and get back to u-boot\n");
  48
  49         while (1) {
  50                 int c;
  51
  52                 /* read from console and display on serial port */
  53                 if (stdio_devices[0]->tstc()) {
  54                         c = stdio_devices[0]->getc();
  55                         if (last_tilde == 1) {
  56                                 if (c == '.') {
  57                                         putc(c);
  58                                         putc('\n');
  59                                         break;
  60                                 } else {
  61                                         last_tilde = 0;
  62                                         /* write the delayed tilde */
  63                                         dev->putc('~');
  64                                         /* fall-through to print current
  65                                          * character */
  66                                 }
  67                         }
  68                         if (c == '~') {
  69                                 last_tilde = 1;
  70                                 puts("[u-boot]");
  71                                 putc(c);
  72                         }
  73                         dev->putc(c);
  74                 }
  75
  76                 /* read from serial port and display on console */
  77                 if (dev->tstc()) {
  78                         c = dev->getc();
  79                         putc(c);
  80                 }
  81         }
  82         return 0;
  83 }
  84
  85
  86 /***************************************************/
  87
  88 U_BOOT_CMD(
  89         terminal,       3,      1,      do_terminal,
  90         "terminal - start terminal emulator\n",
  91         ""
  92 );