From 8b75c47257cc6c09536c5a9da1154b0f170c19b4 Mon Sep 17 00:00:00 2001
From: dj1an <dj1an@darc.de>
Date: Thu, 24 Jun 2021 19:50:29 +0200
Subject: [PATCH] Added PTT Output for external Amplifier

---
 data/tracker.json         |  8 ++++++++
 src/LoRa_APRS_Tracker.cpp | 19 +++++++++++++++++++
 src/configuration.cpp     | 12 ++++++++++++
 src/configuration.h       | 13 +++++++++++++
 4 files changed, 52 insertions(+)

diff --git a/data/tracker.json b/data/tracker.json
index 43bb129..9ed6067 100644
--- a/data/tracker.json
+++ b/data/tracker.json
@@ -27,5 +27,13 @@
 		"spreading_factor":12,
 		"signal_bandwidth":125000,
 		"coding_rate4":5
+	},
+	"ptt_output":
+	{
+		"active":false,
+		"io_pin": 4,
+		"start_delay": 0,
+		"end_delay": 0,
+		"reverse":false
 	}
 }
diff --git a/src/LoRa_APRS_Tracker.cpp b/src/LoRa_APRS_Tracker.cpp
index 6c3a3e9..34067d0 100644
--- a/src/LoRa_APRS_Tracker.cpp
+++ b/src/LoRa_APRS_Tracker.cpp
@@ -60,6 +60,12 @@ void setup()
 	setup_gps();
 	setup_lora();
 
+	if (Config.ptt.active)
+	{
+		pinMode(Config.ptt.io_pin, OUTPUT);
+		digitalWrite(Config.ptt.io_pin, Config.ptt.reverse ? HIGH : LOW);
+	}
+
 	// make sure wifi and bt is off as we don't need it:
 	WiFi.mode(WIFI_OFF);
 	btStop();
@@ -244,6 +250,13 @@ void loop()
 		String data = msg.encode();
 		logPrintlnD(data);
 		show_display("<< TX >>", data);
+
+		if (Config.ptt.active)
+		{
+			digitalWrite(Config.ptt.io_pin, Config.ptt.reverse ? LOW : HIGH);
+			delay(Config.ptt.start_delay);
+		}
+
 		LoRa.beginPacket();
 		// Header:
 		LoRa.write('<');
@@ -261,6 +274,12 @@ void loop()
 			lastTxdistance = 0.0;
 			lastTxTime = millis();
 		}
+
+		if (Config.ptt.active)
+		{
+			delay(Config.ptt.end_delay);
+			digitalWrite(Config.ptt.io_pin, Config.ptt.reverse ? HIGH : LOW);
+		}
 	}
 
 	if(gps_time_update)
diff --git a/src/configuration.cpp b/src/configuration.cpp
index afac9a4..d887935 100644
--- a/src/configuration.cpp
+++ b/src/configuration.cpp
@@ -68,6 +68,12 @@ Configuration ConfigurationManagement::readConfiguration()
 	conf.lora.signalBandwidth		= data["lora"]["signal_bandwidth"]			| 125000;
 	conf.lora.codingRate4			= data["lora"]["coding_rate4"]				| 5;
 
+	conf.ptt.active					= data["ptt_output"]["active"]				| false;
+	conf.ptt.io_pin					= data["ptt_output"]["io_pin"]				| 4;
+	conf.ptt.start_delay			= data["ptt_output"]["start_delay"]			| 0;
+	conf.ptt.end_delay				= data["ptt_output"]["end_delay"]			| 0;
+	conf.ptt.reverse				= data["ptt_output"]["reverse"]				| false;
+
 	return conf;
 }
 
@@ -104,6 +110,12 @@ void ConfigurationManagement::writeConfiguration(Configuration conf)
 	data["lora"]["signal_bandwidth"]		= conf.lora.signalBandwidth;
 	data["lora"]["coding_rate4"]			= conf.lora.codingRate4;
 	
+	data["ptt_out"]["active"]				= conf.ptt.active;
+	data["ptt_out"]["io_pin"] 				= conf.ptt.io_pin;
+	data["ptt_out"]["start_delay"]			= conf.ptt.start_delay;
+	data["ptt_out"]["end_delay"]			= conf.ptt.end_delay;
+	data["ptt_out"]["reverse"] 				= conf.ptt.reverse;
+
 	serializeJson(data, file);
 	file.close();
 }
diff --git a/src/configuration.h b/src/configuration.h
index ab2e93d..3bfb8ae 100644
--- a/src/configuration.h
+++ b/src/configuration.h
@@ -47,6 +47,18 @@ public:
 		int codingRate4;
 	};
 
+	class PTT
+	{
+		public:
+		PTT() :  active(false), io_pin(4), start_delay(0), end_delay(0), reverse(false) {}
+
+		bool active;
+		int io_pin;
+		int start_delay;
+		int end_delay;
+		bool reverse;
+	};
+
 	Configuration() : callsign("NOCALL-10"), debug(false) {};
 
 	String callsign;
@@ -54,6 +66,7 @@ public:
 	Beacon beacon;
 	Smart_Beacon smart_beacon;
 	LoRa lora;
+	PTT ptt;
 };
 
 class ConfigurationManagement