Hello Jenkins Builder,
I'd like you to reexamine a change. Please visit
https://gerrit.osmocom.org/3162
to look at the new patch set (#2).
Add pseudo-random bit sequence generator to libosmcoore
These PRBS sequences are specified in ITU-T O.150. They are typically
used as test data to be transmitted for BER (bit error rate) testing.
Change-Id: I227b6a6e86a251460ecb816afa9a7439d5fb94d1
---
M include/Makefile.am
A include/osmocom/core/prbs.h
M src/Makefile.am
A src/prbs.c
M tests/Makefile.am
A tests/prbs/prbs_test.c
A tests/prbs/prbs_test.ok
M tests/testsuite.at
8 files changed, 174 insertions(+), 3 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/62/3162/2
diff --git a/include/Makefile.am b/include/Makefile.am
index e0c1a2b..4e92d55 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -31,6 +31,7 @@
osmocom/core/macaddr.h \
osmocom/core/msgb.h \
osmocom/core/panic.h \
+ osmocom/core/prbs.h \
osmocom/core/prim.h \
osmocom/core/process.h \
osmocom/core/rate_ctr.h \
diff --git a/include/osmocom/core/prbs.h b/include/osmocom/core/prbs.h
new file mode 100644
index 0000000..aaca17d
--- /dev/null
+++ b/include/osmocom/core/prbs.h
@@ -0,0 +1,25 @@
+#pragma once
+#include <stdint.h>
+#include <osmocom/core/bits.h>
+
+/*! \brief definition of a PRBS sequence */
+struct osmo_prbs {
+ const char *name; /*!< human-readable name */
+ unsigned int len; /*!< length in bits */
+ uint64_t coeff; /*!< coefficients */
+};
+
+/*! \brief state of a given PRBS sequence generator */
+struct osmo_prbs_state {
+ const struct osmo_prbs *prbs;
+ uint64_t state;
+};
+
+extern const struct osmo_prbs osmo_prbs7;
+extern const struct osmo_prbs osmo_prbs9;
+extern const struct osmo_prbs osmo_prbs11;
+extern const struct osmo_prbs osmo_prbs15;
+
+void osmo_prbs_state_init(struct osmo_prbs_state *st, const struct osmo_prbs
*prbs);
+ubit_t osmo_prbs_get_ubit(struct osmo_prbs_state *state);
+int osmo_prbs_get_ubits(ubit_t *out, unsigned int out_len, struct
osmo_prbs_state *state);
diff --git a/src/Makefile.am b/src/Makefile.am
index d8fceca..8e7ef4b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,7 +21,7 @@
conv.c application.c rbtree.c strrb.c \
loggingrb.c crc8gen.c crc16gen.c crc32gen.c crc64gen.c
\
macaddr.c stat_item.c stats.c stats_statsd.c prim.c \
- conv_acc.c conv_acc_generic.c sercomm.c
+ conv_acc.c conv_acc_generic.c sercomm.c prbs.c
if HAVE_SSE3
libosmocore_la_SOURCES += conv_acc_sse.c
diff --git a/src/prbs.c b/src/prbs.c
new file mode 100644
index 0000000..be52fd4
--- /dev/null
+++ b/src/prbs.c
@@ -0,0 +1,74 @@
+/* Osmocom implementation of pseudo-random bit sequence generation */
+/* (C) 2017 by Harald Welte <[email protected]> */
+
+#include <stdint.h>
+#include <string.h>
+#include <osmocom/core/bits.h>
+#include <osmocom/core/prbs.h>
+
+/*! \brief PRBS-7 according ITU-T O.150 */
+const struct osmo_prbs osmo_prbs7 = {
+ /* x^7 + x^6 + 1 */
+ .name = "PRBS-7",
+ .len = 7,
+ .coeff = (1<<6) | (1<<5),
+};
+
+/*! \brief PRBS-9 according ITU-T O.150 */
+const struct osmo_prbs osmo_prbs9 = {
+ /* x^9 + x^5 + 1 */
+ .name = "PRBS-9",
+ .len = 9,
+ .coeff = (1<<8) | (1<<4),
+};
+
+/*! \brief PRBS-11 according ITU-T O.150 */
+const struct osmo_prbs osmo_prbs11 = {
+ /* x^11 + x^9 + 1 */
+ .name = "PRBS-11",
+ .len = 11,
+ .coeff = (1<<10) | (1<<8),
+};
+
+/*! \brief PRBS-15 according ITU-T O.150 */
+const struct osmo_prbs osmo_prbs15 = {
+ /* x^15 + x^14+ 1 */
+ .name = "PRBS-15",
+ .len = 15,
+ .coeff = (1<<14) | (1<<13),
+};
+
+/*! \brief Initialize the given caller-allocated PRBS state */
+void osmo_prbs_state_init(struct osmo_prbs_state *st, const struct osmo_prbs
*prbs)
+{
+ memset(st, 0, sizeof(*st));
+ st->prbs = prbs;
+ st->state = 1;
+}
+
+static void osmo_prbs_process_bit(struct osmo_prbs_state *state, ubit_t bit)
+{
+ state->state >>= 1;
+ if (bit)
+ state->state ^= state->prbs->coeff;
+}
+
+/*! \brief Get the next bit out of given PRBS instance */
+ubit_t osmo_prbs_get_ubit(struct osmo_prbs_state *state)
+{
+ ubit_t result = state->state & 0x1;
+ osmo_prbs_process_bit(state, result);
+
+ return result;
+}
+
+/*! \brief Fill buffer of unpacked bits with next bits out of given PRBS
instance */
+int osmo_prbs_get_ubits(ubit_t *out, unsigned int out_len, struct
osmo_prbs_state *state)
+{
+ unsigned int i;
+
+ for (i = 0; i < out_len; i++)
+ out[i] = osmo_prbs_get_ubit(state);
+
+ return i;
+}
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 158c37e..37378fb 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -15,7 +15,7 @@
write_queue/wqueue_test socket/socket_test \
coding/coding_test conv/conv_gsm0503_test \
abis/abis_test endian/endian_test sercomm/sercomm_test \
- stats/stats_test
+ stats/stats_test prbs/prbs_test
if ENABLE_MSGFILE
check_PROGRAMS += msgfile/msgfile_test
@@ -183,6 +183,9 @@
sercomm_sercomm_test_SOURCES = sercomm/sercomm_test.c
sercomm_sercomm_test_LDADD = $(top_builddir)/src/libosmocore.la
+prbs_prbs_test_SOURCES = prbs/prbs_test.c
+prbs_prbs_test_LDADD = $(top_builddir)/src/libosmocore.la
+
# The `:;' works around a Bash 3.2 bug when the output is not writeable.
$(srcdir)/package.m4: $(top_srcdir)/configure.ac
:;{ \
@@ -226,7 +229,7 @@
osmo-auc-gen/osmo-auc-gen_test.ok \
osmo-auc-gen/osmo-auc-gen_test.err \
conv/conv_gsm0503_test.ok endian/endian_test.ok \
- sercomm/sercomm_test.ok
+ sercomm/sercomm_test.ok prbs/prbs_test.ok
DISTCLEANFILES = atconfig atlocal conv/gsm0503_test_vectors.c
BUILT_SOURCES = conv/gsm0503_test_vectors.c
diff --git a/tests/prbs/prbs_test.c b/tests/prbs/prbs_test.c
new file mode 100644
index 0000000..b57401d
--- /dev/null
+++ b/tests/prbs/prbs_test.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+#include <osmocom/core/prbs.h>
+
+static void dump_bits(const ubit_t *bits, unsigned int num_bits)
+{
+ unsigned int i;
+
+ for (i = 0; i < num_bits; i++) {
+ if (bits[i])
+ fputc('1', stdout);
+ else
+ fputc('0', stdout);
+ }
+ fputc('\n',stdout);
+}
+
+static void test_prbs(const struct osmo_prbs *prbs)
+{
+ struct osmo_prbs_state st;
+ unsigned int i;
+
+ printf("Testing PRBS sequence generation '%s'\n", prbs->name);
+ osmo_prbs_state_init(&st, prbs);
+
+ /* 2 lines */
+ for (i = 0; i < 2; i++) {
+ unsigned int seq_len = (1 << prbs->len)-1;
+ ubit_t bits[seq_len];
+ memset(bits, 0, sizeof(bits));
+ osmo_prbs_get_ubits(bits, sizeof(bits), &st);
+ dump_bits(bits, sizeof(bits));
+ }
+
+ printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+ test_prbs(&osmo_prbs7);
+ test_prbs(&osmo_prbs9);
+ test_prbs(&osmo_prbs11);
+ test_prbs(&osmo_prbs15);
+
+ exit(0);
+}
diff --git a/tests/prbs/prbs_test.ok b/tests/prbs/prbs_test.ok
new file mode 100644
index 0000000..e0c587c
--- /dev/null
+++ b/tests/prbs/prbs_test.ok
@@ -0,0 +1,16 @@
+Testing PRBS sequence generation 'PRBS-7'
+1000001100001010001111001000101100111010100111110100001110001001001101101011011110110001101001011101110011001010101111111000000
+1000001100001010001111001000101100111010100111110100001110001001001101101011011110110001101001011101110011001010101111111000000
+
+Testing PRBS sequence generation 'PRBS-9'
+1000010001100001001110010101011000011011110100110111001000101000010101101001111110110010010010110111111001001101010011001100000001100011001010001101001011111110100010110001110101100101100111100011111011101000001101011011011101100000101101011111010101010000001010010101111001011101110000001110011101001001111010111010100010010000110011100001011110110110011010000111011110000111111111000001111011111000101110011001000001001010011101101000111100111110011011000101010010001110001101101010111000100110001000100000000
+1000010001100001001110010101011000011011110100110111001000101000010101101001111110110010010010110111111001001101010011001100000001100011001010001101001011111110100010110001110101100101100111100011111011101000001101011011011101100000101101011111010101010000001010010101111001011101110000001110011101001001111010111010100010010000110011100001011110110110011010000111011110000111111111000001111011111000101110011001000001001010011101101000111100111110011011000101010010001110001101101010111000100110001000100000000
+
+Testing PRBS sequence generation 'PRBS-11'
+1000000001010000001000100001010101001000000011010000011100100011011101011101010001010000101000100100010101101010000110000100111100101110011100101111011100100101011101100001010111001000010111010010010100110110001111011101100101010111100000010011000010111110010010001110110101101011000110001110111101101010010110000110011100111111011110000101001100100011111101011000010001110010101101110000110101100111000111110110110001011011101001101010011110000111001100110111111111010000000100100000101101000100110010101111110000100001100101001111100011100011011011011101101101010110110000011011100011101011011010001101100101110111100101010011100000111011000110101110111000101010110100000011001000011111010011000100111110101110001000101101010100110000001111100001100011001111011111100101000011100010011011010111101100010010111010110010100011110001011001101001111110011100001111011001100101111111100100000011101000011010010011100110111011111010101000100000010101000010000010010100010110001010011101000111010010110
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11010011110100111001001110111011101010101010000000000
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1001100110011111111111000000000110000000111100000110011000111111110110000001011100001001011001011001111001111100111100011110011011001111101111100010100011010001011100101001011100011001011011111001101000111110010110001110011101101111010110100100011001101011111110001000001101010001110000101101100100110111101111010010100100110001101111101110100010101001010000011000100011110101011001000001111010001100100101111101100100010111101010010010000110110100111011001110101111101000100010010101010110000000011100000011011000011101110011010101111100000100011000101011110100001001001001011011011001101101111110110100001011001001001111011011100101101011100110001011111101001000010011010010111100110010011111110111000001010110001000011101010011010000111100100110011101111111010100000100001000101001010100011000001011110001001001101011011110001101001101110011110101111001000100111010101110100000101001000100011010101011100000001011000001001110001011101101001010110011000011111110011000001111110001100001101111001
11010011110100111001001110111011101010101010000000000
+
+Testing PRBS sequence generation 'PRBS-15'
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11001101011001001010111101011011111000111101100001001000110100011011001011100101101011100101110111100101110011000101110010101001110010111111010010111000001110111001000010011001011000110101011101001011111100111011100000101001100100001111010101100010001111110100110010000011101010110000100111111010001101000001110010111000010010111001000110111001011001011001011101011101011100111100111100101000101000101111001111001110001010001010010011110011110110100010100011011100111100101100101000101110101111001110011110001010010100010011110111100110100011000101011100101001111100101111010000101110001110001110010010010010010110110110110111011011011011001101101101101010110110110111111011011011000001101101101000010110110111000111011011001001001101101011011010110111101101111011000110110001101001011010010111011101110111001100110011001010101010101011111111111111100000000000000
+
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 63027d9..f148cf5 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -280,3 +280,9 @@
cat $abs_srcdir/sercomm/sercomm_test.ok > expout
AT_CHECK([$abs_top_builddir/tests/sercomm/sercomm_test], [0], [expout],
[ignore])
AT_CLEANUP
+
+AT_SETUP([prbs])
+AT_KEYWORDS([prbs])
+cat $abs_srcdir/prbs/prbs_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/prbs/prbs_test], [0], [expout], [ignore])
+AT_CLEANUP
--
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I227b6a6e86a251460ecb816afa9a7439d5fb94d1
Gerrit-PatchSet: 2
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Harald Welte <[email protected]>
Gerrit-Reviewer: Jenkins Builder
