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