Compiler Warning UARTClass.cpp and RingBuffer.h correction

Author: techpaul

hardware/arduino/sam/cores/arduino/RingBuffer.h

@@ -22,7 +22,7 @@
 #include <stdint.h>
 
 // Define constants and variables for buffering incoming serial data.  We're
-// using a ring buffer (I think), in which head is the index of the location
+// using a ring buffer, in which head is the index of the location
 // to which to write the next incoming character and tail is the index of the
 // location from which to read.
 #define SERIAL_BUFFER_SIZE 128

hardware/arduino/sam/cores/arduino/UARTClass.cpp

@@ -149,12 +149,12 @@ size_t UARTClass::write( const uint8_t uc_data )
       (_tx_buffer->_iTail != _tx_buffer->_iHead))
   {
     // If busy we buffer
-    unsigned int l = (_tx_buffer->_iHead + 1) % SERIAL_BUFFER_SIZE;
-    while (_tx_buffer->_iTail == l)
+    int nextWrite = (_tx_buffer->_iHead + 1) % SERIAL_BUFFER_SIZE;
+    while (_tx_buffer->_iTail == nextWrite)
       ; // Spin locks if we're about to overwrite the buffer. This continues once the data is sent
 
     _tx_buffer->_aucBuffer[_tx_buffer->_iHead] = uc_data;
-    _tx_buffer->_iHead = l;
+    _tx_buffer->_iHead = nextWrite;
     // Make sure TX interrupt is enabled
     _pUart->UART_IER = UART_IER_TXRDY;
   }