|
5
|
1 /*
|
|
|
2 * SpanDSP - a series of DSP components for telephony
|
|
|
3 *
|
|
|
4 * bert.h - Bit error rate tests.
|
|
|
5 *
|
|
|
6 * Written by Steve Underwood <steveu@coppice.org>
|
|
|
7 *
|
|
|
8 * Copyright (C) 2004 Steve Underwood
|
|
|
9 *
|
|
|
10 * All rights reserved.
|
|
|
11 *
|
|
|
12 * This program is free software; you can redistribute it and/or modify
|
|
|
13 * it under the terms of the GNU General Public License version 2, as
|
|
|
14 * published by the Free Software Foundation.
|
|
|
15 *
|
|
|
16 * This program is distributed in the hope that it will be useful,
|
|
|
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
19 * GNU General Public License for more details.
|
|
|
20 *
|
|
|
21 * You should have received a copy of the GNU General Public License
|
|
|
22 * along with this program; if not, write to the Free Software
|
|
|
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
24 *
|
|
|
25 * $Id: bert.h,v 1.13 2006/10/24 13:45:27 steveu Exp $
|
|
|
26 */
|
|
|
27
|
|
|
28 #if !defined(_BERT_H_)
|
|
|
29 #define _BERT_H_
|
|
|
30
|
|
|
31 /*! \page bert_page The Bit Error Rate tester
|
|
|
32 \section bert_page_sec_1 What does it do?
|
|
|
33 The Bit Error Rate tester generates a pseudo random bit stream. It also accepts such
|
|
|
34 a pattern, synchronises to it, and checks the bit error rate in this stream.
|
|
|
35
|
|
|
36 \section bert_page_sec_2 How does it work?
|
|
|
37 The Bit Error Rate tester generates a bit stream, with a repeating 2047 bit pseudo
|
|
|
38 random pattern, using an 11 stage polynomial generator. It also accepts such a pattern,
|
|
|
39 synchronises to it, and checks the bit error rate in this stream. If the error rate is
|
|
|
40 excessive the tester assumes synchronisation has been lost, and it attempts to
|
|
|
41 resynchronise with the stream.
|
|
|
42
|
|
|
43 The bit error rate is continuously assessed against decadic ranges -
|
|
|
44 > 1 in 10^2
|
|
|
45 > 1 in 10^3
|
|
|
46 > 1 in 10^4
|
|
|
47 > 1 in 10^5
|
|
|
48 > 1 in 10^6
|
|
|
49 > 1 in 10^7
|
|
|
50 < 1 in 10^7
|
|
|
51 To ensure fairly smooth results from this assessment, each decadic level is assessed
|
|
|
52 over 10/error rate bits. That is, to assess if the signal's BER is above or below 1 in 10^5
|
|
|
53 the software looks over 10*10^5 => 10^6 bits.
|
|
|
54 */
|
|
|
55
|
|
|
56 enum
|
|
|
57 {
|
|
|
58 BERT_REPORT_SYNCED,
|
|
|
59 BERT_REPORT_UNSYNCED,
|
|
|
60 BERT_REPORT_REGULAR,
|
|
|
61 BERT_REPORT_GT_10_2,
|
|
|
62 BERT_REPORT_LT_10_2,
|
|
|
63 BERT_REPORT_LT_10_3,
|
|
|
64 BERT_REPORT_LT_10_4,
|
|
|
65 BERT_REPORT_LT_10_5,
|
|
|
66 BERT_REPORT_LT_10_6,
|
|
|
67 BERT_REPORT_LT_10_7
|
|
|
68 };
|
|
|
69
|
|
|
70 /* The QBF strings should be:
|
|
|
71 "VoyeZ Le BricK GeanT QuE J'ExaminE PreS Du WharF 123 456 7890 + - * : = $ % ( )"
|
|
|
72 "ThE QuicK BrowN FoX JumpS OveR ThE LazY DoG 123 456 7890 + - * : = $ % ( )"
|
|
|
73 */
|
|
|
74
|
|
|
75 enum
|
|
|
76 {
|
|
|
77 BERT_PATTERN_ZEROS,
|
|
|
78 BERT_PATTERN_ONES,
|
|
|
79 BERT_PATTERN_7_TO_1,
|
|
|
80 BERT_PATTERN_3_TO_1,
|
|
|
81 BERT_PATTERN_1_TO_1,
|
|
|
82 BERT_PATTERN_1_TO_3,
|
|
|
83 BERT_PATTERN_1_TO_7,
|
|
|
84 BERT_PATTERN_QBF,
|
|
|
85 BERT_PATTERN_ITU_O151_23,
|
|
|
86 BERT_PATTERN_ITU_O151_20,
|
|
|
87 BERT_PATTERN_ITU_O151_15,
|
|
|
88 BERT_PATTERN_ITU_O152_11,
|
|
|
89 BERT_PATTERN_ITU_O153_9
|
|
|
90 };
|
|
|
91
|
|
|
92 /*!
|
|
|
93 Bit error rate tester (BERT) results descriptor. This is used to report the
|
|
|
94 results of a BER test.
|
|
|
95 */
|
|
|
96 typedef struct
|
|
|
97 {
|
|
|
98 int total_bits;
|
|
|
99 int bad_bits;
|
|
|
100 int resyncs;
|
|
|
101 } bert_results_t;
|
|
|
102
|
|
|
103 typedef void (*bert_report_func_t)(void *user_data, int reason, bert_results_t *bert_results);
|
|
|
104
|
|
|
105 /*!
|
|
|
106 Bit error rate tester (BERT) descriptor. This defines the working state for a
|
|
|
107 single instance of the BERT.
|
|
|
108 */
|
|
|
109 typedef struct
|
|
|
110 {
|
|
|
111 int pattern;
|
|
|
112 int pattern_class;
|
|
|
113 bert_report_func_t reporter;
|
|
|
114 void *user_data;
|
|
|
115 int report_frequency;
|
|
|
116 int limit;
|
|
|
117
|
|
|
118 uint32_t tx_reg;
|
|
|
119 int tx_step;
|
|
|
120 int tx_step_bit;
|
|
|
121 int tx_bits;
|
|
|
122 int tx_zeros;
|
|
|
123
|
|
|
124 uint32_t rx_reg;
|
|
|
125 uint32_t ref_reg;
|
|
|
126 uint32_t master_reg;
|
|
|
127 int rx_step;
|
|
|
128 int rx_step_bit;
|
|
|
129 int resync;
|
|
|
130 int rx_bits;
|
|
|
131 int rx_zeros;
|
|
|
132 int resync_len;
|
|
|
133 int resync_percent;
|
|
|
134 int resync_bad_bits;
|
|
|
135 int resync_cnt;
|
|
|
136
|
|
|
137 uint32_t mask;
|
|
|
138 int shift;
|
|
|
139 int shift2;
|
|
|
140 int max_zeros;
|
|
|
141 int invert;
|
|
|
142 int resync_time;
|
|
|
143
|
|
|
144 int decade_ptr[8];
|
|
|
145 int decade_bad[8][10];
|
|
|
146 int step;
|
|
|
147 int error_rate;
|
|
|
148
|
|
|
149 int bit_error_status;
|
|
|
150 int report_countdown;
|
|
|
151
|
|
|
152 bert_results_t results;
|
|
|
153
|
|
|
154 /*! \brief Error and flow logging control */
|
|
|
155 logging_state_t logging;
|
|
|
156 } bert_state_t;
|
|
|
157
|
|
|
158 #ifdef __cplusplus
|
|
|
159 extern "C" {
|
|
|
160 #endif
|
|
|
161
|
|
|
162 /*! Initialise a BERT context.
|
|
|
163 \param s The BERT context.
|
|
|
164 \param limit The maximum test duration.
|
|
|
165 \param pattern One of the supported BERT signal patterns.
|
|
|
166 \param resync_len ???
|
|
|
167 \param resync_percent The percentage of bad bits which will cause a resync.
|
|
|
168 \return The BERT context. */
|
|
|
169 bert_state_t *bert_init(bert_state_t *s, int limit, int pattern, int resync_len, int resync_percent);
|
|
|
170
|
|
|
171 /*! Get the next bit of the BERT sequence from the generator.
|
|
|
172 \param s The BERT context.
|
|
|
173 \return The bit. */
|
|
|
174 int bert_get_bit(bert_state_t *s);
|
|
|
175
|
|
|
176 /*! Put the next bit of the BERT sequence to the analyser.
|
|
|
177 \param s The BERT context.
|
|
|
178 \param bit The bit. */
|
|
|
179 void bert_put_bit(bert_state_t *s, int bit);
|
|
|
180
|
|
|
181 /*! Set the callback function for reporting the test status.
|
|
|
182 \param s The BERT context.
|
|
|
183 \param freq The required frequency of regular reports.
|
|
|
184 \param reporter The callback function.
|
|
|
185 \param user_data An opaque pointer passed to the reporter routine. */
|
|
|
186 void bert_set_report(bert_state_t *s, int freq, bert_report_func_t reporter, void *user_data);
|
|
|
187
|
|
|
188 /*! Get the results of the BERT.
|
|
|
189 \param s The BERT context.
|
|
|
190 \param results The results.
|
|
|
191 \return The size of the result structure. */
|
|
|
192 int bert_result(bert_state_t *s, bert_results_t *results);
|
|
|
193
|
|
|
194 #ifdef __cplusplus
|
|
|
195 }
|
|
|
196 #endif
|
|
|
197
|
|
|
198 #endif
|
|
|
199 /*- End of file ------------------------------------------------------------*/
|
