remove useless Due config file #752

RF24.h

@@ -171,14 +171,15 @@ class RF24 {
  *
  * See [Related Pages](pages.html) for device specific information <br>
  *
- * @note Users can specify default SPI speed by modifying `#define RF24_SPI_SPEED` in RF24_config.h <br>
- * For Arduino, SPI speed will only be properly configured this way on devices supporting SPI TRANSACTIONS <br>
- * Older/Unsupported Arduino devices will use a default clock divider & settings configuration <br>
- * Linux: The old way of setting SPI speeds using BCM2835 driver enums has been removed <br>
- *
  * @param _cepin The pin attached to Chip Enable on the RF module
- * @param _cspin The pin attached to Chip Select
- * @param _spispeed The SPI speed in Hz ie: 1000000 == 1Mhz
+ * @param _cspin The pin attached to Chip Select (often labeled CSN) on the radio module.
+ * <br><br>For the Arduino Due board, the [Arduino Due extended SPI feature](https://www.arduino.cc/en/Reference/DueExtendedSPI)
+ * is not supported. This means that the Due's pins 4, 10, or 52 are not mandated options (can use any digital output pin) for the radio's CSN pin.
+ * @param _spispeed The SPI speed in Hz ie: 1000000 == 1Mhz <br><br>Users can specify default SPI speed by modifying
+ * `#define RF24_SPI_SPEED` in RF24_config.h
+ * - For Arduino, the default SPI speed will only be properly configured this way on devices supporting SPI TRANSACTIONS
+ * - Older/Unsupported Arduino devices will use a default clock divider & settings configuration
+ * - For Linux: The old way of setting SPI speeds using BCM2835 driver enums has been removed as of v1.3.7
  */
  RF24(uint16_t _cepin, uint16_t _cspin, uint32_t _spispeed = RF24_SPI_SPEED);
 

RF24_config.h

@@ -2,13 +2,14 @@
 /*
  Copyright (C)
  2011 J. Coliz <maniacbug@ymail.com>
- 2015-2019 TMRh20
+ 2015-2019  TMRh20
  2015 spaniakos <spaniakos@gmail.com>
  2015 nerdralph
  2015 zador-blood-stained
  2016 akatran
- 2017-2019 Avamander <avamander@gmail.com>
+ 2017-2019  Avamander <avamander@gmail.com>
  2019 IkpeohaGodson
+ 2021 2bndy5
 
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
@@ -91,6 +92,10 @@
  #define _SPI SoftSPI<SOFT_SPI_MISO_PIN, SOFT_SPI_MOSI_PIN, SOFT_SPI_SCK_PIN, SPI_MODE>
  #define RF24_SPI_PTR
 
+ #elif defined (ARDUINO_SAM_DUE)
+ #include <SPI.h>
+ #define _SPI SPI
+
  #else // !defined (SPI_UART) && !defined (SOFTSPI)
  #include <SPI.h>
  #define _SPI SPIClass