LXR uboot/cmd/terminal.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2007 OpenMoko, Inc.
   4 * Written by Harald Welte <laforge@openmoko.org>
   5 */
   6
   7/*
   8 * Boot support
   9 */
  10#include <common.h>
  11#include <command.h>
  12#include <stdio_dev.h>
  13#include <serial.h>
  14
  15int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char * const argv[])
  16{
  17        int last_tilde = 0;
  18        struct stdio_dev *dev = NULL;
  19
  20        if (argc < 1)
  21                return -1;
  22
  23        /* Scan for selected output/input device */
  24        dev = stdio_get_by_name(argv[1]);
  25        if (!dev)
  26                return -1;
  27
  28        serial_reinit_all();
  29        printf("Entering terminal mode for port %s\n", dev->name);
  30        puts("Use '~.' to leave the terminal and get back to u-boot\n");
  31
  32        while (1) {
  33                int c;
  34
  35                /* read from console and display on serial port */
  36                if (stdio_devices[0]->tstc()) {
  37                        c = stdio_devices[0]->getc();
  38                        if (last_tilde == 1) {
  39                                if (c == '.') {
  40                                        putc(c);
  41                                        putc('\n');
  42                                        break;
  43                                } else {
  44                                        last_tilde = 0;
  45                                        /* write the delayed tilde */
  46                                        dev->putc('~');
  47                                        /* fall-through to print current
  48                                         * character */
  49                                }
  50                        }
  51                        if (c == '~') {
  52                                last_tilde = 1;
  53                                puts("[u-boot]");
  54                                putc(c);
  55                        }
  56                        dev->putc(c);
  57                }
  58
  59                /* read from serial port and display on console */
  60                if (dev->tstc()) {
  61                        c = dev->getc();
  62                        putc(c);
  63                }
  64        }
  65        return 0;
  66}
  67
  68
  69/***************************************************/
  70
  71U_BOOT_CMD(
  72        terminal,       3,      1,      do_terminal,
  73        "start terminal emulator",
  74        ""
  75);
  76