Fixed a bug when pipe 0 was NOT being used for writing.

RF24.cpp

@@ -247,8 +247,9 @@ void RF24::print_address_register(prog_char* name, uint8_t reg, uint8_t qty)
 /****************************************************************************/
 
 RF24::RF24(uint8_t _cepin, uint8_t _cspin):
-  ce_pin(_cepin), csn_pin(_cspin), wide_band(true), p_variant(false), payload_size(32), 
-  ack_payload_available(false), dynamic_payloads_enabled(false)
+  ce_pin(_cepin), csn_pin(_cspin), wide_band(true), p_variant(false), 
+  payload_size(32), ack_payload_available(false), dynamic_payloads_enabled(false),
+  pipe0_reading_address(0)
 {
 }
 
@@ -381,8 +382,9 @@ void RF24::startListening(void)
   write_register(CONFIG, read_register(CONFIG) | _BV(PWR_UP) | _BV(PRIM_RX));
   write_register(STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT) );
 
-  // Restore the pipe0 adddress
-  write_register(RX_ADDR_P0, reinterpret_cast<const uint8_t*>(&pipe0_reading_address), 5);
+  // Restore the pipe0 adddress, if exists
+  if (pipe0_reading_address)
+    write_register(RX_ADDR_P0, reinterpret_cast<const uint8_t*>(&pipe0_reading_address), 5);
 
   // Flush buffers
   flush_rx();