Fix bugs. Ack payload available was broken since interrupts went in. ...

Fix bugs.  Ack payload available was broken since interrupts went in.  stREtries was missing since the gcopeland merge.

RF24.cpp

@@ -457,7 +457,7 @@ bool RF24::write( const void* buf, uint8_t len )
   // * The send was successful (TX_DS)
   // * The send failed, too many retries (MAX_RT)
   // * There is an ack packet waiting (RX_DR)
-  bool tx_ok, tx_fail, ack_payload_available;
+  bool tx_ok, tx_fail;
   whatHappened(tx_ok,tx_fail,ack_payload_available);
 
   result = tx_ok;
@@ -928,5 +928,12 @@ void RF24::disableCRC( void )
   uint8_t disable = read_register(CONFIG) & ~_BV(EN_CRC) ;
   write_register( CONFIG, disable ) ;
 }
+
+/****************************************************************************/
+void RF24::setRetries(uint8_t delay, uint8_t count)
+{
+ write_register(SETUP_RETR,(delay&0xf)<<ARD | (count&0xf)<<ARC);
+}
+
 // vim:ai:cin:sts=2 sw=2 ft=cpp