1 files changed, 4 insertions, 1 deletions
diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index db6b149..d6be218 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -352,12 +352,13 @@ void HardwareSerial::flush()
     ;
 }
 
-void HardwareSerial::write(uint8_t c)
+size_t HardwareSerial::write(uint8_t c)
 {
   int i = (_tx_buffer->head + 1) % SERIAL_BUFFER_SIZE;
 	
   // If the output buffer is full, there's nothing for it other than to 
   // wait for the interrupt handler to empty it a bit
+  // ???: return 0 here instead?
   while (i == _tx_buffer->tail)
     ;
 	
@@ -365,6 +366,8 @@ void HardwareSerial::write(uint8_t c)
   _tx_buffer->head = i;
 	
   sbi(*_ucsrb, _udrie);
+  
+  return 1;
 }
 
 // Preinstantiate Objects //////////////////////////////////////////////////////