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 ); 77