twi.h

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/* 
  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
*/

#pragma once

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define I2C_OK 0
#define I2C_SCL_HELD_LOW 1
#define I2C_SCL_HELD_LOW_AFTER_READ 2
#define I2C_SDA_HELD_LOW 3
#define I2C_SDA_HELD_LOW_AFTER_INIT 4

void twi_init(unsigned char sda, unsigned char scl);
void twi_stop(void);
void twi_setClock(unsigned int freq);
void twi_setClockStretchLimit(uint32_t limit);
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);
uint8_t twi_status();

#ifdef __cplusplus
}
#endif