[SX126x] Added SPI transaction delay for fast platforms

src/modules/SX126x/SX126x.cpp

@@ -1605,6 +1605,13 @@ int16_t SX126x::SPItransfer(uint8_t* cmd, uint8_t cmdLen, bool write, uint8_t* d
       RADIOLIB_VERBOSE_PRINTLN();
     }
     RADIOLIB_VERBOSE_PRINTLN();
+  #else
+    // some faster platforms require a short delay here
+    // not sure why, but it seems that long enough SPI transaction
+    // (e.g. setPacketParams for GFSK) will fail without it
+    #if defined(ARDUINO_ARCH_STM32)
+      delay(1);
+    #endif
   #endif
 
   // parse status