Added possibility to override pin assignments

README.md

@@ -42,6 +42,19 @@ It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) with th
 ### Symbolic view
 ![Symbolic](docs/Wiring_ESP32_Symbol.png)
 
+### Change pin assignment
+Its possible to change the pin assignment for the following pins:
+* CE
+* CS
+* IRQ
+
+This can be achieved by editing the 'platformio.ini' file and add one or more of the following lines to the 'build_flags' parameter:
+```
+-DHOYMILES_PIN_CE=4
+-DHOYMILES_PIN_CS=5
+-DHOYMILES_PIN_IRQ=16
+```
+
 ## Flashing and starting up
 * Install [Visual Studio Code](https://code.visualstudio.com/download)
 * In Visual Studio Code, install the [PlatformIO Extension](https://marketplace.visualstudio.com/items?itemName=platformio.platformio-ide)

lib/Hoymiles/src/HoymilesRadio.cpp

@@ -8,7 +8,7 @@ void HoymilesRadio::init()
 {
     _dtuSerial.u64 = 0;
 
-    _radio.reset(new RF24(PIN_CE, PIN_CS));
+    _radio.reset(new RF24(HOYMILES_PIN_CE, HOYMILES_PIN_CS));
     _radio->begin();
     _radio->setDataRate(RF24_250KBPS);
     _radio->enableDynamicPayloads();
@@ -22,7 +22,7 @@ void HoymilesRadio::init()
         Serial.println(F("Connection error!!"));
     }
 
-    attachInterrupt(digitalPinToInterrupt(PIN_IRQ), std::bind(&HoymilesRadio::handleIntr, this), FALLING);
+    attachInterrupt(digitalPinToInterrupt(HOYMILES_PIN_IRQ), std::bind(&HoymilesRadio::handleIntr, this), FALLING);
 
     openReadingPipe();
     _radio->startListening();

lib/Hoymiles/src/HoymilesRadio.h

@@ -14,9 +14,17 @@
 
 #define MAX_RESEND_COUNT 3
 
-#define PIN_IRQ 16
+#ifndef HOYMILES_PIN_IRQ
-#define PIN_CE 4
+#define HOYMILES_PIN_IRQ 16
-#define PIN_CS 5
+#endif
+
+#ifndef HOYMILES_PIN_CE
+#define HOYMILES_PIN_CE 4
+#endif
+
+#ifndef HOYMILES_PIN_CS
+#define HOYMILES_PIN_CS 5
+#endif
 
 class HoymilesRadio {
 public: