From ddd82845782e020b103e4cba7998b58f723b66e9 Mon Sep 17 00:00:00 2001
From: Michael Geramb <mail@michael-geramb.at>
Date: Mon, 25 Dec 2023 19:39:05 +0100
Subject: [PATCH] Allow to set uart pins for RP2040 and ESP32 platform

---
 src/esp32_platform.cpp          | 25 +++++++++++++++++++++++++
 src/esp32_platform.h            |  6 ++++++
 src/rp2040_arduino_platform.cpp | 23 +++++++++++++++++++++++
 src/rp2040_arduino_platform.h   |  2 ++
 4 files changed, 56 insertions(+)

diff --git a/src/esp32_platform.cpp b/src/esp32_platform.cpp
index ada8fd3d..a8c985ba 100644
--- a/src/esp32_platform.cpp
+++ b/src/esp32_platform.cpp
@@ -10,17 +10,42 @@
 #define KNX_SERIAL Serial1
 #endif
 
+#ifndef KNX_UART_RX_PIN
+#define KNX_UART_RX_PIN -1
+#endif
+
+#ifndef KNX_UART_TX_PIN
+#define KNX_UART_TX_PIN -1
+#endif
+
 Esp32Platform::Esp32Platform()
 #ifndef KNX_NO_DEFAULT_UART
     : ArduinoPlatform(&KNX_SERIAL)
 #endif
 {
+#ifndef KNX_NO_DEFAULT_UART
+    knxUartPins(KNX_UART_RX_PIN, KNX_UART_TX_PIN);
+#endif
 }
 
 Esp32Platform::Esp32Platform(HardwareSerial* s) : ArduinoPlatform(s)
 {
 }
 
+void Esp32Platform::knxUartPins(int8_t rxPin, int8_t txPin)
+{
+    _rxPin = rxPin;
+    _txPin = txPin;
+}
+
+// ESP specific uart handling with pins
+void Esp32Platform::setupUart()
+{
+    _knxSerial->begin(19200, SERIAL_8E1, _rxPin, _txPin);
+    while (!_knxSerial) 
+        ;
+}
+
 uint32_t Esp32Platform::currentIpAddress()
 {
     return WiFi.localIP();
diff --git a/src/esp32_platform.h b/src/esp32_platform.h
index 0193efe4..318291cb 100644
--- a/src/esp32_platform.h
+++ b/src/esp32_platform.h
@@ -10,6 +10,10 @@ class Esp32Platform : public ArduinoPlatform
     Esp32Platform();
     Esp32Platform(HardwareSerial* s);
 
+    // uart
+    void knxUartPins(int8_t rxPin, int8_t txPin);
+    void setupUart() override;
+
     // ip stuff
     uint32_t currentIpAddress() override;
     uint32_t currentSubnetMask() override;
@@ -36,6 +40,8 @@ class Esp32Platform : public ArduinoPlatform
     void commitToEeprom();
 private:
     WiFiUDP _udp;
+    int8_t _rxPin = -1; 
+    int8_t _txPin = -1;
 };
 
 #endif
diff --git a/src/rp2040_arduino_platform.cpp b/src/rp2040_arduino_platform.cpp
index 44eb8c4b..8de0c66e 100644
--- a/src/rp2040_arduino_platform.cpp
+++ b/src/rp2040_arduino_platform.cpp
@@ -49,11 +49,22 @@ A RAM-buffered Flash can be use by defining USE_RP2040_LARGE_EEPROM_EMULATION
 #define KNX_SERIAL Serial1
 #endif
 
+#ifndef KNX_UART_RX_PIN
+#define KNX_UART_RX_PIN UART_PIN_NOT_DEFINED
+#endif
+
+#ifndef KNX_UART_TX_PIN
+#define KNX_UART_TX_PIN UART_PIN_NOT_DEFINED
+#endif
+
 RP2040ArduinoPlatform::RP2040ArduinoPlatform()
 #ifndef KNX_NO_DEFAULT_UART
     : ArduinoPlatform(&KNX_SERIAL)
 #endif
 {
+    #ifndef KNX_NO_DEFAULT_UART
+    knxUartPins(KNX_UART_RX_PIN, KNX_UART_TX_PIN);
+    #endif
     #ifndef USE_RP2040_EEPROM_EMULATION
     _memoryType = Flash;
     #endif
@@ -66,6 +77,18 @@ RP2040ArduinoPlatform::RP2040ArduinoPlatform( HardwareSerial* s) : ArduinoPlatfo
     #endif
 }
 
+void RP2040ArduinoPlatform::knxUartPins(pin_size_t rxPin, pin_size_t txPin)
+{
+    SerialUART* serial = dynamic_cast<SerialUART*>(_knxSerial);
+    if(serial)
+    {
+        if (rxPin != UART_PIN_NOT_DEFINED)
+            serial->setRX(rxPin);
+        if (txPin != UART_PIN_NOT_DEFINED)
+            serial->setTX(txPin);
+    }
+}
+
 void RP2040ArduinoPlatform::setupUart()
 {
     SerialUART* serial = dynamic_cast<SerialUART*>(_knxSerial);
diff --git a/src/rp2040_arduino_platform.h b/src/rp2040_arduino_platform.h
index 15e6dcb7..836f8644 100644
--- a/src/rp2040_arduino_platform.h
+++ b/src/rp2040_arduino_platform.h
@@ -22,6 +22,8 @@ class RP2040ArduinoPlatform : public ArduinoPlatform
     RP2040ArduinoPlatform();
     RP2040ArduinoPlatform( HardwareSerial* s);
 
+    // uart
+    void knxUartPins(pin_size_t rxPin, pin_size_t txPin);
     void setupUart();
 
     // unique serial number