From e7d5f51de3f04ce066612e193c59e1caf2ec80f1 Mon Sep 17 00:00:00 2001
From: Ilias Lolis <ilolis@outlook.com>
Date: Fri, 19 Jan 2024 19:00:20 +0200
Subject: [PATCH 1/2] add flush() method to HardwareSerial

---
 cores/arduino/HardwareSerial.cpp | 7 ++++++-
 cores/arduino/HardwareSerial.h   | 3 ++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index ff9ca2d2a5..dbb31f1eb8 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -487,6 +487,11 @@ int HardwareSerial::availableForWrite(void)
   return tail - head - 1;
 }
 
+void HardwareSerial::flush()
+{
+  flush(0);
+}
+
 void HardwareSerial::flush(uint32_t timeout)
 {
   // If we have never written a byte, no need to flush. This special
@@ -642,7 +647,7 @@ void HardwareSerial::enableHalfDuplexRx(void)
   if (isHalfDuplex()) {
     // In half-duplex mode we have to wait for all TX characters to
     // be transmitted before we can receive data.
-    flush();
+    flush(0);
     if (!_rx_enabled) {
       _rx_enabled = true;
       uart_enable_rx(&_serial);
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index b0089bab19..1806ba5675 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -125,7 +125,8 @@ class HardwareSerial : public Stream {
     virtual int peek(void);
     virtual int read(void);
     int availableForWrite(void);
-    virtual void flush(uint32_t timeout = 0);
+    virtual void flush();
+    void flush(uint32_t timeout = 0);
     virtual size_t write(uint8_t);
     inline size_t write(unsigned long n)
     {

From 0ca4f75771ba95d4d6f54d0e2da59e02b7b6dbbb Mon Sep 17 00:00:00 2001
From: Ilias Lolis <ilolis@outlook.com>
Date: Mon, 22 Jan 2024 00:44:30 +0200
Subject: [PATCH 2/2] remove default argument

---
 cores/arduino/HardwareSerial.cpp | 2 +-
 cores/arduino/HardwareSerial.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index dbb31f1eb8..146cfa234e 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -647,7 +647,7 @@ void HardwareSerial::enableHalfDuplexRx(void)
   if (isHalfDuplex()) {
     // In half-duplex mode we have to wait for all TX characters to
     // be transmitted before we can receive data.
-    flush(0);
+    flush();
     if (!_rx_enabled) {
       _rx_enabled = true;
       uart_enable_rx(&_serial);
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 1806ba5675..bfd94620ba 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -126,7 +126,7 @@ class HardwareSerial : public Stream {
     virtual int read(void);
     int availableForWrite(void);
     virtual void flush();
-    void flush(uint32_t timeout = 0);
+    void flush(uint32_t timeout);
     virtual size_t write(uint8_t);
     inline size_t write(unsigned long n)
     {