Add new TRAU frame sync code
This code is able to detect and sync against a variety of TRAU
frame sync patterns. Focus is so far on those patterns present on
16k sub-slots, but 8k sub-slots are expected to be supported soon,
too.
A new codebase for this is required as the old OsmoNITB code had
conflated a 16k sub-slot multiplexer with TRAU frame synchronization,
so there was no way to separate those two parts and hence no way to
support 8k sub-slots.
Change-Id: Ia6fe6228b0b8b9a27999f37ce1115ed5558881ea
diff --git a/tests/trau_sync/trau_sync_test.c b/tests/trau_sync/trau_sync_test.c
new file mode 100644
index 0000000..392a236
--- /dev/null
+++ b/tests/trau_sync/trau_sync_test.c
@@ -0,0 +1,85 @@
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/trau/trau_sync.h>
+
+static void frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits)
+{
+ char *str = user_data;
+ printf("demux_bits_cb '%s': %s\n", str, osmo_ubit_dump(bits, num_bits));
+}
+
+static const uint8_t sync_pattern[] = {
+ 0x00, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
+ 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
+ 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
+ 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
+ 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
+};
+
+#define ASSERT_STATE(fi, x) OSMO_ASSERT(!strcmp(osmo_fsm_inst_state_name(fi), x))
+
+static void test_body(void)
+{
+ struct osmo_fsm_inst *fi = osmo_trau_sync_alloc(NULL, "test", frame_out_cb, OSMO_TRAU_SYNCP_16_FR_EFR, "test");
+ OSMO_ASSERT(fi);
+
+ printf("\n==> %s\n", __func__);
+
+ ubit_t bits[40*8];
+
+ /* send some invalid data */
+ memset(bits, 0, sizeof(bits));
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ osmo_trau_sync_rx_ubits(fi, bits, 23);
+
+ /* first valid frame */
+ osmo_pbit2ubit(bits, sync_pattern, sizeof(sync_pattern)*8);
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ ASSERT_STATE(fi, "FRAME_ALIGNED");
+
+ /* second valid frame */
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ ASSERT_STATE(fi, "FRAME_ALIGNED");
+
+ /* send wrong frame */
+ memset(bits, 1, sizeof(bits));
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ ASSERT_STATE(fi, "FRAME_ALIGNED");
+
+ /* intersperse a valid frame */
+ osmo_pbit2ubit(bits, sync_pattern, sizeof(sync_pattern)*8);
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+
+ /* second wrong frame - but not consecutive */
+ memset(bits, 1, sizeof(bits));
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ ASSERT_STATE(fi, "FRAME_ALIGNED");
+
+ /* third wrong frame - second consecutive */
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ ASSERT_STATE(fi, "FRAME_ALIGNED");
+
+ /* only from third consecutive invalid frame onwards we should loose alignment */
+ osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
+ ASSERT_STATE(fi, "FRAME_ALIGNMENT_LOST");
+}
+
+
+static const struct log_info_cat default_categories[] = {
+};
+
+const struct log_info log_info = {
+ .cat = default_categories,
+ .num_cat = ARRAY_SIZE(default_categories),
+};
+
+int main(int argc, char **argv)
+{
+ osmo_init_logging2(NULL, NULL);
+ osmo_fsm_log_addr(false);
+ log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_NONE);
+ test_body();
+}
diff --git a/tests/trau_sync/trau_sync_test.err b/tests/trau_sync/trau_sync_test.err
new file mode 100644
index 0000000..f3eac3c
--- /dev/null
+++ b/tests/trau_sync/trau_sync_test.err
@@ -0,0 +1,15 @@
+<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Allocated
+[0;m<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){WAIT_FRAME_ALIGN}: state_chg to FRAME_ALIGNED
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
+[0;m<0000> trau_sync(test){FRAME_ALIGNED}: state_chg to FRAME_ALIGNMENT_LOST
+[0;m<0000> trau_sync(test){FRAME_ALIGNMENT_LOST}: Received Event RX_BITS
+[0;m
\ No newline at end of file
diff --git a/tests/trau_sync/trau_sync_test.ok b/tests/trau_sync/trau_sync_test.ok
new file mode 100644
index 0000000..2555913
--- /dev/null
+++ b/tests/trau_sync/trau_sync_test.ok
@@ -0,0 +1,9 @@
+
+==> test_body
+demux_bits_cb 'test': 00000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000
+demux_bits_cb 'test': 00000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000
+demux_bits_cb 'test': 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+demux_bits_cb 'test': 00000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000
+demux_bits_cb 'test': 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+demux_bits_cb 'test': 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+demux_bits_cb 'test':