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[u-boot] / cmd / terminal.c
1 /*
2  * (C) Copyright 2007 OpenMoko, Inc.
3  * Written by Harald Welte <laforge@openmoko.org>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 /*
9  * Boot support
10  */
11 #include <common.h>
12 #include <command.h>
13 #include <stdio_dev.h>
14 #include <serial.h>
15
16 int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char * const argv[])
17 {
18         int last_tilde = 0;
19         struct stdio_dev *dev = NULL;
20
21         if (argc < 1)
22                 return -1;
23
24         /* Scan for selected output/input device */
25         dev = stdio_get_by_name(argv[1]);
26         if (!dev)
27                 return -1;
28
29         serial_reinit_all();
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()) {
38                         c = stdio_devices[0]->getc();
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('~');
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(c);
58                 }
59
60                 /* read from serial port and display on console */
61                 if (dev->tstc()) {
62                         c = dev->getc();
63                         putc(c);
64                 }
65         }
66         return 0;
67 }
68
69
70 /***************************************************/
71
72 U_BOOT_CMD(
73         terminal,       3,      1,      do_terminal,
74         "start terminal emulator",
75         ""
76 );