1 files changed, 83 insertions, 0 deletions
diff --git a/src/osmo-bts-trx/gsm0503_conv.c b/src/osmo-bts-trx/gsm0503_conv.c
new file mode 100644
index 00000000..79667715
--- /dev/null
+++ b/src/osmo-bts-trx/gsm0503_conv.c
@@ -0,0 +1,83 @@
+
+#include <stdint.h>
+
+#include <osmocom/core/conv.h>
+
+#include "gsm0503_conv.h"
+
+/*
+ * GSM convolutional coding
+ *
+ * G_0 = 1 + x^3 + x^4
+ * G_1 = 1 + x + x^3 + x^4
+ */
+
+static const uint8_t conv_xcch_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t conv_xcch_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+
+const struct osmo_conv_code gsm0503_conv_xcch = {
+	.N = 2,
+	.K = 5,
+	.len = 224,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+
+
+const struct osmo_conv_code gsm0503_conv_cs2 = {
+	.N = 2,
+	.K = 5,
+	.len = 290,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+
+
+const struct osmo_conv_code gsm0503_conv_cs3 = {
+	.N = 2,
+	.K = 5,
+	.len = 334,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+
+
+const struct osmo_conv_code gsm0503_conv_rach = {
+	.N = 2,
+	.K = 5,
+	.len = 14,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+ 
+
+const struct osmo_conv_code gsm0503_conv_sch = {
+	.N = 2,
+	.K = 5,
+	.len = 35,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+ 
+
+const struct osmo_conv_code gsm0503_conv_tch_fr = {
+	.N = 2,
+	.K = 5,
+	.len = 185,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+
+