File content as of revision 2:3c0eab894a4b:

/*
 *  I2C library made by Jurica Resetar @ aconno
 *  2017
 *  More info @ aconno.de
 *  jurica_resetar@yahoo.com
 *  All right reserved
 *
 */

#include "aconno_i2c.h"

aconno_i2c::aconno_i2c(I2C *i2c, char address){
    this->i2c = i2c;    
    i2cAddress = address;
}

uint8_t aconno_i2c::writeToReg(char regAddress, char *data, int len){
    uint8_t success; /* '0' - NAK was received '1' - ACK was received, '2' - timeout */
    char dataToSend[2];
    
    dataToSend[0] = regAddress;
    dataToSend[1] = *data;
    success = i2c->write(i2cAddress & 0xFE, dataToSend, len + 1); // R/W bit is set low for a write command
    return success;
}

uint8_t aconno_i2c::readFromReg(char regAddress, char *dataBuffer, int len){
    uint8_t success;    /* 0 on success (ack), non-0 on failure (nack) */
    char regAddr = regAddress;
    
    i2c->write(i2cAddress & 0xFE, &regAddr, 1);               // R/W bit is set low for a write command
    success = i2c->read(i2cAddress | 0x01, dataBuffer, len);     // R/W bit is set high for a read command
    return success;
}

/* 
 *  This method is used with sendCommand(char *command, uint8_t len) method when delay between command
 *  and response from the slave is required
 */
uint8_t aconno_i2c::readBus(char *dataBuffer, int len){
    uint8_t success;    /* 0 on success (ack), non-0 on failure (nack) */
    
    success = i2c->read(i2cAddress | 0x01, dataBuffer, len);     // R/W bit is set high for a read command
    return success;
}

/*
 *  This method is used to send commands to I2C Device. 
 *  Ex. send 2B command to Si7006 to get Device ID.
 */
uint8_t aconno_i2c::sendCommand(char *command, uint8_t len, char *response, uint8_t responseLen){
    uint8_t success;    /* 0 on success (ack), non-0 on failure (nack) */
    
    i2c->write(i2cAddress & 0xFE, command, len);               // R/W bit is set low for a write command
    success = i2c->read(i2cAddress | 0x01, response, responseLen);     // R/W bit is set high for a read command
    return success;
}

uint8_t aconno_i2c::sendCommand(char *command, uint8_t len){
    uint8_t success;    /* 0 on success (ack), non-0 on failure (nack) */
    
    success = i2c->write(i2cAddress & 0xFE, command, len);
    return success;
}