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

4 files changed, 74 insertions, 2 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 158c37ed..37378fbc 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -15,7 +15,7 @@ check_PROGRAMS = timer/timer_test sms/sms_test ussd/ussd_test		\
 		 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 @@ endian_endian_test_LDADD = $(top_builddir)/src/libosmocore.la
 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 @@ EXTRA_DIST = testsuite.at $(srcdir)/package.m4 $(TESTSUITE)		\
 	     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 00000000..f478635b
--- /dev/null
+++ b/tests/prbs/prbs_test.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.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 00000000..e0c587c4
--- /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'
+1000000001010000001000100001010101001000000011010000011100100011011101011101010001010000101000100100010101101010000110000100111100101110011100101111011100100101011101100001010111001000010111010010010100110110001111011101100101010111100000010011000010111110010010001110110101101011000110001110111101101010010110000110011100111111011110000101001100100011111101011000010001110010101101110000110101100111000111110110110001011011101001101010011110000111001100110111111111010000000100100000101101000100110010101111110000100001100101001111100011100011011011011101101101010110110000011011100011101011011010001101100101110111100101010011100000111011000110101110111000101010110100000011001000011111010011000100111110101110001000101101010100110000001111100001100011001111011111100101000011100010011011010111101100010010111010110010100011110001011001101001111110011100001111011001100101111111100100000011101000011010010011100110111011111010101000100000010101000010000010010100010110001010011101000111010010110100110011001111111111100000000011000000011110000011001100011111111011000000101110000100101100101100111100111110011110001111001101100111110111110001010001101000101110010100101110001100101101111100110100011111001011000111001110110111101011010010001100110101111111000100000110101000111000010110110010011011110111101001010010011000110111110111010001010100101000001100010001111010101100100000111101000110010010111110110010001011110101001001000011011010011101100111010111110100010001001010101011000000001110000001101100001110111001101010111110000010001100010101111010000100100100101101101100110110111111011010000101100100100111101101110010110101110011000101111110100100001001101001011110011001001111111011100000101011000100001110101001101000011110010011001110111111101010000010000100010100101010001100000101111000100100110101101111000110100110111001111010111100100010011101010111010000010100100010001101010101110000000101100000100111000101110110100101011001100001111111001100000111111000110000110111100111010011110100111001001110111011101010101010000000000
+1000000001010000001000100001010101001000000011010000011100100011011101011101010001010000101000100100010101101010000110000100111100101110011100101111011100100101011101100001010111001000010111010010010100110110001111011101100101010111100000010011000010111110010010001110110101101011000110001110111101101010010110000110011100111111011110000101001100100011111101011000010001110010101101110000110101100111000111110110110001011011101001101010011110000111001100110111111111010000000100100000101101000100110010101111110000100001100101001111100011100011011011011101101101010110110000011011100011101011011010001101100101110111100101010011100000111011000110101110111000101010110100000011001000011111010011000100111110101110001000101101010100110000001111100001100011001111011111100101000011100010011011010111101100010010111010110010100011110001011001101001111110011100001111011001100101111111100100000011101000011010010011100110111011111010101000100000010101000010000010010100010110001010011101000111010010110100110011001111111111100000000011000000011110000011001100011111111011000000101110000100101100101100111100111110011110001111001101100111110111110001010001101000101110010100101110001100101101111100110100011111001011000111001110110111101011010010001100110101111111000100000110101000111000010110110010011011110111101001010010011000110111110111010001010100101000001100010001111010101100100000111101000110010010111110110010001011110101001001000011011010011101100111010111110100010001001010101011000000001110000001101100001110111001101010111110000010001100010101111010000100100100101101101100110110111111011010000101100100100111101101110010110101110011000101111110100100001001101001011110011001001111111011100000101011000100001110101001101000011110010011001110111111101010000010000100010100101010001100000101111000100100110101101111000110100110111001111010111100100010011101010111010000010100100010001101010101110000000101100000100111000101110110100101011001100001111111001100000111111000110000110111100111010011110100111001001110111011101010101010000000000
+
+Testing PRBS sequence generation 'PRBS-15'
+1000000000000011000000000000101000000000001111000000000010001000000000110011000000001010101000000011111111000000100000001000001100000011000010100000101000111100001111001000100010001011001100110011101010101010100111111111111101000000000000111000000000001001000000000011011000000000101101000000001110111000000010011001000000110101011000001011111101000011100000111000100100001001001101100011011010110100101101111011101110110001100110011010010101010101110111111111110011000000000010101000000000111111000000001000001000000011000011000000101000101000001111001111000010001010001000110011110011001010100010101011111100111111100000101000000100001111000001100010001000010100110011000111101010101001000111111111011001000000001101011000000010111101000000111000111000001001001001000011011011011000101101101101001110110110111010011011011001110101101101010011110110111110100011011000011100101101000100101110111001101110011001010110010101011111010111111100001111000000100010001000001100110011000010101010101000111111111111001000000000001011000000000011101000000000100111000000001101001000000010111011000000111001101000001001010111000011011111001000101100001011001110100011101010011100100111110100101101000011101110111000100110011001001101010101011010111111111101111000000000110001000000001010011000000011110101000000100011111000001100100001000010101100011000111110100101001000011101111011000100110001101001101010010111010111110111001111000011001010001000101011110011001111100010101010000100111111110001101000000010010111000000110111001000001011001011000011101011101000100111100111001101000101001010111001111011111001010001100001011110010100011100010111100100100111000101101101001001110110111011010011011001101110101101010110011110111111010100011000001111100101000010000101111000110001110001001010010010011011110110110101100011011011110100101101100011101110110100100110011011101101010101100110111111110101011000000011111101000000100000111000001100001001000010100011011000111100101101001000101110111011001110011001101010010101010111110111111111000011000000001000101000000011001111000000101010001000001111110011000010000010101000110000111111001010001000001011110011000011100010101000100100111111001101101000001010110111000011111011001000100001101011001100010111101010100111000111111101001001000000111011011000001001101101000011010110111000101111011001001110001101011010010010111101110110111000110011011001001010101101011011111110111101100000011000110100000101001011100001111011100100010001100101100110010101110101010111110011111111000010100000001000111100000011001000100000101011001100001111101010100010000111111100110001000000101010011000001111110101000010000011111000110000100001001010001100011011110010100101100010111101110100111000110011101001001010100111011011111101001101100000111010110100001001111011100011010001100100101110010101101110010111110110010111000011010111001000101111001011001110001011101010010011100111110110100101000011011101111000101100110001001110101010011010011111110101110100000011110011100000100010100100001100111101100010101000110100111111001011101000001011100111000011100101001000100101111011001101110001101010110010010111111010110111000001111011001000010001101011000110010111101001010111000111011111001001001100001011011010100011101101111100100110110000101101011010001110111101110010011000110010110101001010111011111011111001100001100001010100010100011111100111100100000101000101100001111001110100010001010011100110011110100101010100011101111111100100110000000101101010000001110111110000010011000010000110101000110001011111001010011100001011110100100011100011101100100100100110101101101101011110110110111100011011011000100101101101001101110110111010110011011001111010101101010001111110111110010000011000010110000101000111010001111001001110010001011010010110011101110111010100110011001111101010101010000111111111110001000000000010011000000000110101000000001011111000000011100001000000100100011000001101100101000010110101111000111011110001001001100010011011010100110101101111101011110110000111100011010001000100101110011001101110010101010110010111111111010111000000001111001000000010001011000000110011101000001010100111000011111101001000100000111011001100001001101010100011010111111100101111000000101110001000001110010011000010010110101000110111011111001011001100001011101010100011100111111100100101000000101101111000001110110001000010011010011000110101110101001011110011111011100010100001100100111100010101101000100111110111001101000011001010111000101011111001001111100001011010000100011101110001100100110010010101101010110111110111111011000011000001101000101000010111001111000111001010001001001011110011011011100010101101100100111110110101101000011011110111000101100011001001110100101011010011101111101110100110000110011101010001010100111110011111101000010100000111000111100001001001000100011011011001100101101101010101110110111111110011011000000010101101000000111110111000001000011001000011000101011000101001111101001111010000111010001110001001110010010011010010110110101110111011011110011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