Added option to disable "paranoid" SPI mode (enabled by default)

src/BuildOpt.h

@@ -390,6 +390,13 @@
 
 //#define RADIOLIB_STATIC_ONLY
 
+/*
+ * Uncomment to enable "paranoid" SPI mode
+ * Every write to an SPI register using SPI set function will be verified by a subsequent read operation.
+ * This improves reliablility, but slightly slows down communication.
+ */
+#define RADIOLIB_SPI_PARANOID
+
 // set the size of static arrays to use
 #if !defined(RADIOLIB_STATIC_ARRAY_SIZE)
 #define RADIOLIB_STATIC_ARRAY_SIZE   256

src/Module.cpp

@@ -216,6 +216,7 @@ int16_t Module::SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb, uint8_t
   uint8_t newValue = (currentValue & ~mask) | (value & mask);
   SPIwriteRegister(reg, newValue);
 
+  #if defined(RADIOLIB_SPI_PARANOID)
     // check register value each millisecond until check interval is reached
     // some registers need a bit of time to process the change (e.g. SX127X_REG_OP_MODE)
     uint32_t start = Module::micros();
@@ -249,6 +250,9 @@ int16_t Module::SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb, uint8_t
     RADIOLIB_DEBUG_PRINTLN();
 
     return(ERR_SPI_WRITE_FAILED);
+  #else
+    return(ERR_NONE);
+  #endif
 }
 
 void Module::SPIreadRegisterBurst(uint8_t reg, uint8_t numBytes, uint8_t* inBytes) {