78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2007 OpenMoko, Inc.
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* Written by Harald Welte <laforge@openmoko.org>
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*/
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/*
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* Boot support
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*/
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#include <common.h>
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#include <command.h>
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#include <stdio_dev.h>
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#include <serial.h>
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int do_terminal(struct cmd_tbl *cmd, int flag, int argc, char *const argv[])
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{
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int last_tilde = 0;
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struct stdio_dev *dev = NULL;
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if (argc < 1)
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return -1;
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/* Scan for selected output/input device */
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dev = stdio_get_by_name(argv[1]);
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if (!dev)
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return -1;
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if (IS_ENABLED(CONFIG_SERIAL))
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serial_reinit_all();
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printf("Entering terminal mode for port %s\n", dev->name);
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puts("Use '~.' to leave the terminal and get back to u-boot\n");
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while (1) {
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int c;
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/* read from console and display on serial port */
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if (stdio_devices[0]->tstc(stdio_devices[0])) {
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c = stdio_devices[0]->getc(stdio_devices[0]);
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if (last_tilde == 1) {
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if (c == '.') {
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putc(c);
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putc('\n');
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break;
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} else {
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last_tilde = 0;
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/* write the delayed tilde */
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dev->putc(dev, '~');
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/* fall-through to print current
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* character */
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}
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}
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if (c == '~') {
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last_tilde = 1;
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puts("[u-boot]");
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putc(c);
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}
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dev->putc(dev, c);
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}
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/* read from serial port and display on console */
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if (dev->tstc(dev)) {
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c = dev->getc(dev);
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putc(c);
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}
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}
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return 0;
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}
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/***************************************************/
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U_BOOT_CMD(
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terminal, 3, 1, do_terminal,
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"start terminal emulator",
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""
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);
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