1 /* vi: set sw=4 ts=4: */
3 * compact speed_t <-> speed functions for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 static const struct speed_map speeds[] = {
52 {B38400, 38400/256 + 0x8000U},
54 {EXTB, 38400/256 + 0x8000U},
57 {B57600, 57600/256 + 0x8000U},
60 {B115200, 115200/256 + 0x8000U},
63 {B230400, 230400/256 + 0x8000U},
66 {B460800, 460800/256 + 0x8000U},
70 static const int NUM_SPEEDS = (sizeof(speeds) / sizeof(struct speed_map));
72 unsigned long bb_baud_to_value(speed_t speed)
77 if (speed == speeds[i].speed) {
78 if (speeds[i].value & 0x8000U) {
79 return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
81 return speeds[i].value;
83 } while (++i < NUM_SPEEDS);
88 speed_t bb_value_to_baud(unsigned long value)
93 if (value == bb_baud_to_value(speeds[i].speed)) {
94 return speeds[i].speed;
96 } while (++i < NUM_SPEEDS);
110 for (v = 0 ; v < 500000 ; v++) {
111 s = bb_value_to_baud(v);
112 if (s == (speed_t) -1) {
115 printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
118 printf("-------------------------------\n");
120 for (s = 0 ; s < 010017+1 ; s++) {
121 v = bb_baud_to_value(s);
125 printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);