Merge pull request arduino#4669 from sandeepmistry/software-serial-peek-cast

Add missing cast to SoftwareSerial::peek() when returning buffered value

Author: agdl

hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.cpp

@@ -48,7 +48,7 @@ The latest version of this library can always be found at
 // Statics
 //
 SoftwareSerial *SoftwareSerial::active_object = 0;
-char SoftwareSerial::_receive_buffer[_SS_MAX_RX_BUFF]; 
+uint8_t SoftwareSerial::_receive_buffer[_SS_MAX_RX_BUFF]; 
 volatile uint8_t SoftwareSerial::_receive_buffer_tail = 0;
 volatile uint8_t SoftwareSerial::_receive_buffer_head = 0;
 

hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.h

@@ -66,7 +66,7 @@ class SoftwareSerial : public Stream
   uint16_t _inverse_logic:1;
 
   // static data
-  static char _receive_buffer[_SS_MAX_RX_BUFF]; 
+  static uint8_t _receive_buffer[_SS_MAX_RX_BUFF]; 
   static volatile uint8_t _receive_buffer_tail;
   static volatile uint8_t _receive_buffer_head;
   static SoftwareSerial *active_object;