Merge fix for static payloads

RF24.cpp

@@ -111,16 +111,11 @@ uint8_t RF24::write_payload(const void* buf, uint8_t len)
   csn(LOW);
   status = SPI.transfer( W_TX_PAYLOAD );
   uint8_t data_len = min(len,payload_size);
+  uint8_t blank_len = payload_size - data_len;
   while ( data_len-- )
     SPI.transfer(*current++);
-
-  // This does not seem to be needed.  Keeping it here in case
-  // removing it does cause problems for static payloads
-  //
-  // Send blanks out to the chip to finish off the payload 
-  //uint8_t blank_len = payload_size - data_len;
-  //while ( blank_len-- )
-  //  SPI.transfer(0);
+  while ( blank_len-- )
+    SPI.transfer(0);
 
   csn(HIGH);
 
@@ -137,18 +132,11 @@ uint8_t RF24::read_payload(void* buf, uint8_t len)
   csn(LOW);
   status = SPI.transfer( R_RX_PAYLOAD );
   uint8_t data_len = min(len,payload_size);
+  uint8_t blank_len = payload_size - data_len;
   while ( data_len-- )
     *current++ = SPI.transfer(0xff);
-  
-  // This does not seem to be needed.  Keeping it here in case
-  // removing it does cause problems for static payloads
-  //
-  // Read the remaining payload off the chip, even though we will
-  // throw it away.
-  //uint8_t blank_len = payload_size - data_len;
-  //while ( blank_len-- )
-  //  SPI.transfer(0xff);
-  
+  while ( blank_len-- )
+    SPI.transfer(0xff);
   csn(HIGH);
 
   return status;