From 0c42ce6f281217e9827feba787aa711cc0a0db4b Mon Sep 17 00:00:00 2001
From: Bigbits <bigbits@bigbits.cc>
Date: Fri, 12 Apr 2019 19:31:59 +0800
Subject: [PATCH] fix a bug

---
 cores/arduino/UARTClass.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/arduino/UARTClass.cpp b/cores/arduino/UARTClass.cpp
index 6092fc9..9768a46 100644
--- a/cores/arduino/UARTClass.cpp
+++ b/cores/arduino/UARTClass.cpp
@@ -107,7 +107,7 @@ UARTClass::read(void)
   while(this->_buff->available()){
     return this->_buff->read_char();
   }
-  return 0;
+  return -1;
 }
 
 void