From 02aed60775cf88a6398b303d15ddb538127fd95c Mon Sep 17 00:00:00 2001
From: Aadi Desai <21363892+supleed2@users.noreply.github.com>
Date: Tue, 1 Jun 2021 17:46:31 +0100
Subject: [PATCH] Add software serial library and demo

Connect each TX/RX pair as loopback: results in message passing through both pairs of hardware and software UARTs and echoing back input to serial monitor
---
 Control/platformio.ini |  1 +
 Control/src/main.cpp   | 54 ++++++++++++++++++++++++++++++++----------
 2 files changed, 42 insertions(+), 13 deletions(-)

diff --git a/Control/platformio.ini b/Control/platformio.ini
index 88d8882..1f6cf0c 100644
--- a/Control/platformio.ini
+++ b/Control/platformio.ini
@@ -15,3 +15,4 @@ framework = arduino
 monitor_speed = 115200
 upload_port = COM[3]
 monitor_filters = send_on_enter
+lib_deps = plerup/EspSoftwareSerial@^6.12.6
diff --git a/Control/src/main.cpp b/Control/src/main.cpp
index 847d03a..d3e85ef 100644
--- a/Control/src/main.cpp
+++ b/Control/src/main.cpp
@@ -1,33 +1,61 @@
 #include <Arduino.h>
 #include <string>
+#include <SoftwareSerial.h>
 
 #define RX1pin 14 // Pin 10 on expansion board
 #define TX1pin  4 // Pin 11 on expansion board
 #define RX2pin 15 // Pin 12 on expansion board
 #define TX2pin  2 // Pin 13 on expansion board
+#define RX3pin 18 // Pin 6 on expansion board
+#define TX3pin  5 // Pin 7 on expansion board
+#define RX4pin 17 // Pin 8 on expansion board
+#define TX4pin 16 // Pin 9 on expansion board
 
-void forwardprint();
+void forwardprint1() {
+	if(Serial1.available()){
+		input1 = String(Serial1.readStringUntil('\n'));
+		Serial2.println(input1);
+	}
+}
+void forwardprint2() {
+	if(Serial2.available()){
+		input2 = String(Serial2.readStringUntil('\n'));
+		Serial3.println(input2);
+	}
+}
+void forwardprint3() {
+	if(Serial3.available()){
+		input3 = String(Serial3.readStringUntil('\n'));
+		Serial4.println(input3);
+	}
+}
+void forwardprint4() {
+	if(Serial4.available()){
+		input4 = String(Serial4.readStringUntil('\n'));
+		Serial.println(input4);
+	}
+}
 
 int counter;
-String input1, input2;
+String input, input1, input2, input3, input4;
+SoftwareSerial Serial3;
+SoftwareSerial Serial4;
 
 void setup() {
 	Serial.begin(115200); // Set up hardware UART 0 (Connected to USB port)
 	Serial1.begin(9600, SERIAL_8N1, RX1pin, TX1pin); // Set up hardware UART 1
 	Serial2.begin(9600, SERIAL_8N1, RX2pin, TX2pin); // Set up hardware UART 2
+	Serial3.begin(9600, SWSERIAL_8N1, RX3pin, TX3pin); // Set up software UART 3
+	Serial4.begin(9600, SWSERIAL_8N1, RX4pin, TX4pin); // Set up software UART 4
 }
 
 void loop() {
-	forwardprint();
 	if(Serial.available()){
-		input1 = String(Serial.readStringUntil('\n'));
-		Serial1.println(input1);
+		input = String(Serial.readStringUntil('\n'));
+		Serial1.println(input);
 	}
-}
-
-void forwardprint() {
-	if(Serial2.available()){
-		input2 = String(Serial2.readStringUntil('\n'));
-		Serial.println(input2);
-	}
-}
+	forwardprint1();
+	forwardprint2();
+	forwardprint3();
+	forwardprint4();
+}
\ No newline at end of file