fix UART RX PullUps and TWI

cores/esp8266/twi.h

@@ -0,0 +1,39 @@
+/* 
+  twi.h - Software I2C library for esp8266
+
+  Copyright (c) 2015 Hristo Gochkov. All rights reserved.
+  This file is part of the esp8266 core for Arduino environment.
+ 
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#ifndef SI2C_h
+#define SI2C_h
+#include "Arduino.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void twi_init(unsigned char sda, unsigned char scl);
+void twi_stop(void);
+void twi_setClock(unsigned int freq);
+uint8_t twi_writeTo(unsigned char address, unsigned char * buf, unsigned int len, unsigned char sendStop);
+uint8_t twi_readFrom(unsigned char address, unsigned char * buf, unsigned int len, unsigned char sendStop);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif