- fixed a compatibility issue in case that setMISO/MOSI/SCLK methods …

…would not exist (different architectures)

src/TMCStepper.h

@@ -63,6 +63,50 @@
 
 #define TMCSTEPPER_VERSION 0x000703 // v0.7.3
 
+// Since we don't have C++20 we need to do some ugly hacks to ensure compat.
+// https://stackoverflow.com/questions/63253287/using-sfinae-to-detect-method-with-gcc
+#define __DEF_HAS_METH( methName ) \
+	template<typename T> \
+	struct ___has_##methName \
+	{ \
+    template<typename C> \
+    static constexpr auto test(...) -> std::false_type; \
+		template<typename C> \
+		static constexpr auto test(int) \
+		-> decltype(static_cast<void>(std::declval<C>().methName(0)), std::true_type()); \
+    using result_type       = decltype(test<T>(0)); \
+    static const bool value = result_type::value; \
+	}
+#define __HAS_METH( className, methName ) \
+	( ___has_##methName <className>::value )
+
+__DEF_HAS_METH( setMISO );
+__DEF_HAS_METH( setMOSI );
+__DEF_HAS_METH( setSCLK );
+
+#define SPI_SET_PIN_HELPER( pinDescName ) \
+	template <bool hasPin> \
+	struct _spiInitHelper_##pinDescName \
+	{}; \
+	template <> \
+	struct _spiInitHelper_##pinDescName <true> \
+	{ \
+		template <typename SPIClassT> \
+		static void spiSet##pinDescName( SPIClassT& spi, uint16_t pin )	{ spi.set##pinDescName( pin ); } \
+	}; \
+	template <> \
+	struct _spiInitHelper_##pinDescName <false> \
+	{ \
+		template <typename SPIClassT> \
+		static void spiSet##pinDescName( SPIClassT& spi, uint16_t pin )	{} \
+	}
+
+SPI_SET_PIN_HELPER( MISO );
+SPI_SET_PIN_HELPER( MOSI );
+SPI_SET_PIN_HELPER( SCLK );
+
+#define SPI_INIT_PIN( spi, pinDescName, val ) _spiInitHelper_##pinDescName <__HAS_METH(SPIClass, set##pinDescName)> ::spiSet##pinDescName( spi, val )
+
 class TMCStepper {
 	public:
 		uint16_t cs2rms(uint8_t CS);

src/source/TMC2130Stepper.cpp

@@ -76,9 +76,9 @@ void TMC2130Stepper::switchCSpin(bool state) {
 __attribute__((weak))
 void TMC2130Stepper::beginTransaction() {
   if (TMC_SW_SPI == nullptr) {
-    SPI.setMISO(_pinMISO);
-    SPI.setMOSI(_pinMOSI);
-    SPI.setSCLK(_pinSCK);
+    SPI_INIT_PIN( SPI, MISO, _pinMISO );
+    SPI_INIT_PIN( SPI, MOSI, _pinMOSI );
+    SPI_INIT_PIN( SPI, SCLK, _pinSCK );
     SPI.begin();
     SPI.beginTransaction(SPISettings(spi_speed, MSBFIRST, SPI_MODE3));
   }

src/source/TMC2660Stepper.cpp

@@ -53,9 +53,9 @@ uint32_t TMC2660Stepper::read() {
     response <<= 8;
     response |= TMC_SW_SPI->transfer(dummy & 0xFF);
   } else {
-    SPI.setMISO(_pinMISO);
-    SPI.setMOSI(_pinMOSI);
-    SPI.setSCLK(_pinSCK);
+    SPI_INIT_PIN( SPI, MISO, _pinMISO );
+    SPI_INIT_PIN( SPI, MOSI, _pinMOSI );
+    SPI_INIT_PIN( SPI, SCLK, _pinSCK );
     SPI.begin();
     SPI.beginTransaction(SPISettings(spi_speed, MSBFIRST, SPI_MODE3));
     switchCSpin(LOW);
@@ -79,9 +79,9 @@ void TMC2660Stepper::write(uint8_t addressByte, uint32_t config) {
     TMC_SW_SPI->transfer((data >>  8) & 0xFF);
     TMC_SW_SPI->transfer(data & 0xFF);
   } else {
-    SPI.setMISO(_pinMISO);
-    SPI.setMOSI(_pinMOSI);
-    SPI.setSCLK(_pinSCK);
+    SPI_INIT_PIN( SPI, MISO, _pinMISO );
+    SPI_INIT_PIN( SPI, MOSI, _pinMOSI );
+    SPI_INIT_PIN( SPI, SCLK, _pinSCK );
     SPI.begin();
     SPI.beginTransaction(SPISettings(spi_speed, MSBFIRST, SPI_MODE3));
     switchCSpin(LOW);