Added disableDynamicPayloads() (#318)

Added a function to disable dynamic payloads but ACK payloads are also disabled at the same time because they depend on dynamic payloads.

RF24.cpp

@@ -1256,6 +1256,26 @@ void RF24::enableDynamicPayloads(void)
   dynamic_payloads_enabled = true;
 }
 
+/****************************************************************************/
+void RF24::disableDynamicPayloads(void)
+{
+  // Disables dynamic payload throughout the system.  Also disables Ack Payloads
+
+  //toggle_features();
+  write_register(FEATURE,read_register(FEATURE) & ~(_BV(EN_DPL) | _BV(EN_ACK_PAY)));
+
+
+  IF_SERIAL_DEBUG(printf("FEATURE=%i\r\n",read_register(FEATURE)));
+
+  // Disable dynamic payload on all pipes
+  //
+  // Not sure the use case of only having dynamic payload on certain
+  // pipes, so the library does not support it.
+  write_register(DYNPD,read_register(DYNPD) & ~( _BV(DPL_P5) | _BV(DPL_P4) | _BV(DPL_P3) | _BV(DPL_P2) | _BV(DPL_P1) | _BV(DPL_P0)));
+
+  dynamic_payloads_enabled = false;
+}
+
 /****************************************************************************/
 
 void RF24::enableAckPayload(void)

RF24.h

@@ -781,6 +781,17 @@ s   *
    */
   void enableDynamicPayloads(void);
 
+  /**
+   * Disable dynamically-sized payloads
+   *
+   * This disables dynamic payloads on ALL pipes. Since Ack Payloads
+   * requires Dynamic Payloads, Ack Payloads are also disabled.
+   * If dynamic payloads are later re-enabled and ack payloads are desired
+   * then enableAckPayload() must be called again as well.
+   *
+   */
+  void disableDynamicPayloads(void);
+
   /**
    * Enable dynamic ACKs (single write multicast or unicast) for chosen messages
    *