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(struct cmd_tbl *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        if (IS_ENABLED(CONFIG_SERIAL))
  29                serial_reinit_all();
  30
  31        printf("Entering terminal mode for port %s\n", dev->name);
  32        puts("Use '~.' to leave the terminal and get back to u-boot\n");
  33
  34        while (1) {
  35                int c;
  36
  37                /* read from console and display on serial port */
  38                if (stdio_devices[0]->tstc(stdio_devices[0])) {
  39                        c = stdio_devices[0]->getc(stdio_devices[0]);
  40                        if (last_tilde == 1) {
  41                                if (c == '.') {
  42                                        putc(c);
  43                                        putc('\n');
  44                                        break;
  45                                } else {
  46                                        last_tilde = 0;
  47                                        /* write the delayed tilde */
  48                                        dev->putc(dev, '~');
  49                                        /* fall-through to print current
  50                                         * character */
  51                                }
  52                        }
  53                        if (c == '~') {
  54                                last_tilde = 1;
  55                                puts("[u-boot]");
  56                                putc(c);
  57                        }
  58                        dev->putc(dev, c);
  59                }
  60
  61                /* read from serial port and display on console */
  62                if (dev->tstc(dev)) {
  63                        c = dev->getc(dev);
  64                        putc(c);
  65                }
  66        }
  67        return 0;
  68}
  69
  70
  71/***************************************************/
  72
  73U_BOOT_CMD(
  74        terminal,       3,      1,      do_terminal,
  75        "start terminal emulator",
  76        ""
  77);
  78