From 0efc915c0ed64b185802200148a02b6b354a554d Mon Sep 17 00:00:00 2001
From: KubaPro010 <kuba.pro010@gmail.com>
Date: Sun, 13 Apr 2025 15:53:38 +0200
Subject: [PATCH] you can send additional information via 1A and eon also this
 update requires a reset of the save

---
 doc.md          |  4 ++++
 src/ascii_cmd.c | 12 ++++++++++++
 src/rds.c       | 25 +++++++++++++++++++------
 src/rds.h       |  3 +++
 4 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/doc.md b/doc.md
index f30b303..fbc9350 100644
--- a/doc.md
+++ b/doc.md
@@ -45,6 +45,10 @@ Sets the TA flag and triggers Traffic PS: `TA=0`
 Sets the DPTY flag: `DPTY=1`  
 *Formerly DI*
 
+### SLCD
+
+The 1A group where ECC is sent can also be used to send broadcaster data: `SLCD=FFF`
+
 ### CT
 
 Toggles the transmission of CT groups: `CT=1`  
diff --git a/src/ascii_cmd.c b/src/ascii_cmd.c
index 87d0b9f..665b7cc 100644
--- a/src/ascii_cmd.c
+++ b/src/ascii_cmd.c
@@ -89,6 +89,11 @@ static void handle_dpty(char *arg, RDSModulator* mod, char* output) {
 	strcpy(output, "+\0");
 }
 
+static void handle_slcdata(char *arg, RDSModulator* mod, char* output) {
+	mod->enc->data[mod->enc->program].slc_data = strtoul(arg, NULL, 16);
+	strcpy(output, "+\0");
+}
+
 static void handle_tp(char *arg, RDSModulator* mod, char* output) {
 	mod->enc->data[mod->enc->program].tp = atoi(arg);
 	strcpy(output, "+\0");
@@ -400,6 +405,11 @@ static void handle_eonaf(char *arg, char *pattern, RDSModulator* mod, char* outp
 	strcpy(output, "+\0");
 }
 
+static void handle_eondt(char *arg, char *pattern, RDSModulator* mod, char* output) {
+	mod->enc->data[mod->enc->program].eon[atoi(pattern)-1].data = strtoul(arg, NULL, 16);
+	strcpy(output, "+\0");
+}
+
 static const command_handler_t commands_eq3[] = {
 	{"PS", handle_ps, 2},
 	{"PI", handle_pi, 2},
@@ -424,6 +434,7 @@ static const command_handler_t commands_eq5[] = {
 	{"TEXT", handle_rt1, 4},
 	{"PTYN", handle_ptyn, 4},
 	{"DPTY", handle_dpty, 4},
+	{"SLCD", handle_slcd, 4},
 };
 
 static const command_handler_t commands_eq2[] = {
@@ -466,6 +477,7 @@ static const pattern_command_handler_t pattern_commands[] = {
 	{"EON", "TA", handle_eonta},
 	{"EON", "TP", handle_eontp},
 	{"EON", "AF", handle_eonaf},
+	{"EON", "DT", handle_eondt}
 	{"UDG", "", handle_udg},
 };
 
diff --git a/src/rds.c b/src/rds.c
index 64cff41..b03d655 100644
--- a/src/rds.c
+++ b/src/rds.c
@@ -298,6 +298,12 @@ static void get_rds_ecc_group(RDSEncoder* enc, RDSGroup *group) {
 	group->c = enc->data[enc->program].ecc;
 }
 
+static void get_rds_slcdata_group(RDSEncoder* enc, RDSGroup *group) {
+	group->b |= 1 << 12;
+	group->c = 0x6000;
+	group->c |= enc->data[enc->program].slc_data;
+}
+
 static void get_rds_rtplus_group(RDSEncoder* enc, RDSGroup *group) {
 	group->b |= 11 << 12;
 	group->b |= enc->rtpState[enc->program].toggle << 4 | enc->rtpData[enc->program].running << 3;
@@ -332,20 +338,22 @@ get_eon:
 		break;
 	case 4:
 		group->c = get_next_af_eon(enc, enc->state[enc->program].eon_index);
+		group->b |= enc->state[enc->program].eon_state;
 		break;
 	case 5: // 13
-		if(eon.pty == 0 && eon.tp == 0) {
-			break;
-		}
 		group->c = eon.pty << 11;
 		if(eon.tp) group->c |= eon.ta;
 		group->b |= 13;
 		break;
+	case 6: // 15
+		group->c = eon.data;
+		group->b |= 15;
+		break;
 	}
 
 	group->d = eon.pi;
 
-	if(enc->state[enc->program].eon_state == 5) {
+	if(enc->state[enc->program].eon_state == 6) {
 		enc->state[enc->program].eon_index++;
 
 		uint8_t i = 0;
@@ -421,7 +429,12 @@ static void get_rds_sequence_group(RDSEncoder* enc, RDSGroup *group, char* grp,
 			get_rds_ps_group(enc, group);
 			goto group_coded;
 		case '1':
-			get_rds_ecc_group(enc, group);
+			if(enc->state[enc->program].data_ecc == 0 && enc->data[enc->program].slc_data != 0) {
+				get_rds_slcdata_group(enc, group);
+			} else {
+				get_rds_ecc_group(enc, group);
+			}
+			enc->state[enc->program].data_ecc ^= 1;
 			goto group_coded;
 		case '2':
 			get_rds_rt_group(enc, group);
@@ -478,7 +491,7 @@ static uint8_t check_rds_good_group(RDSEncoder* enc, char* grp, uint8_t stream)
 	(void)stream;
 	uint8_t good_group = 0;
 	if(*grp == '0') good_group = 1;
-	if(*grp == '1' && enc->data[enc->program].ecc != 0) good_group = 1;
+	if(*grp == '1' && (enc->data[enc->program].ecc != 0 || enc->data[enc->program].slc_data != 0)) good_group = 1;
 	if(*grp == '2' && (enc->data[enc->program].rt1_enabled || enc->data[enc->program].rt2_enabled)) good_group = 1;
 	if(*grp == 'A' && enc->data[enc->program].ptyn_enabled) good_group = 1;
 	if(*grp == 'E') {
diff --git a/src/rds.h b/src/rds.h
index b7c5986..b244df1 100644
--- a/src/rds.h
+++ b/src/rds.h
@@ -48,6 +48,7 @@ typedef struct {
 	uint8_t pty : 5;
 	char ps[8];
 	RDSAFs af;
+	uint16_t data : 16;
 } RDSEON;
 typedef struct {
 	uint16_t pi;
@@ -56,6 +57,7 @@ typedef struct {
 	char rt1[RT_LENGTH];
 
 	uint8_t ecc;
+	uint16_t slc_data : 12;
 
 	uint8_t ta : 1;
 	uint8_t pty : 5;
@@ -138,6 +140,7 @@ typedef struct {
 
 	uint8_t rtp_oda : 1;
 	uint8_t ert_oda : 1;
+	uint8_t data_ecc : 1;
 	uint8_t grp_seq_idx[4];
 	uint8_t udg_idxs[2];