Code (C++)

BasicObjClass.cpp.o*: In function BasicObjCLass::run(int)
BasicObjClass.h:29: multiple definition of i2c_buffer

Error linking for board Generic ESP8266 Module
sonoff.cpp.o*: \pgmspace.h:103: first defined here
global.cpp.o*: (.bss.i2c_buffer+0x0): multiple definition of i2c_buffer
sonoff.cpp.o*: pgmspace.h:103: first defined here
Build failed for project 'sonoff'

Def from global.h
#ifndef _GLOBAL_h
#define _GLOBAL_h
#include "Arduino.h"
#define I2C_RETRY_COUNTER 3

uint32_t i2c_buffer = 0;

const char classObjName[] PROGMEM = { "basicobj/pcf8574/pcf8591/tftsd1303/KEY12x4/CRON" };// List of all related objects to print name (Search Function => GetIndex(



String GetFirstParam(String * param, const char seperator);

int8 GetIndex(String param, String Search, const char seperator);
String GetEntry(uint8_t idx, String param);
bool I2cValidRead(uint8_t addr, uint8_t reg, uint8_t size);
uint8_t I2cRead8(uint8_t addr, uint8_t reg);

#endif

global.cpp

#include "global.h"

#include "Wire.h"


String GetFirstParam(String *param, const char seperator) // Extract the first param
{
	String cmd = "";
	int pos = param->indexOf(seperator);
	if (pos == 0)
	{
		param->remove(0, 1);
		pos = param->indexOf(seperator);
	}

	if (pos == -1)
	{
		pos = param->length();
	}


	if (pos > 0)
	{
		cmd = param->substring(0, pos);

		param->remove(0, pos + 1);
	}

	return cmd;
}
int8 GetIndex(String param, String Search, const char seperator)  // Start counting on 0; -1 = false
{
	int8 i = 0;

	bool found = false;
	param.toLowerCase();
	Search.toLowerCase();
	do
	{

		found = (Search == GetFirstParam(&param, seperator));
		if (!found)
		{
			i++;

		}


	} while ((!found) && (param.length() > 0));
	if (!found)
	{
		i = -1;
	}

	return i;

}
// const char classObjName[] PROGMEM = { "basicobj/pcf8574/pcf8591/tftsd1303/KEY12x4/CRON" };// List of all related objects to print name (Search Function => GetIndex(
String GetEntry(uint8_t idx, String param)
{
	uint8_t i = 0;
	String buf = param;
	String tmp;
	Serial.println("-------------GetEntry-----------------");
	Serial.print ("Search index: ");
	Serial.println(idx);

	do
	{

		tmp = GetFirstParam(&param, '/'); // Extract the first param
		i++;
		Serial.println(i);
		Serial.println(param);
		Serial.println(tmp);
	} while (i < idx + 1); // Verbesserung Eventuell auch noch prüfen ob tmp.length() > 0

	Serial.println(tmp);

	return tmp;
}
bool I2cValidRead(uint8_t addr, uint8_t reg, uint8_t size)
{
	byte x = I2C_RETRY_COUNTER;

	i2c_buffer = 0;
	do {
		Wire.beginTransmission(addr);                       // start transmission to device
		Wire.write(reg);                                    // sends register address to read from
		if (0 == Wire.endTransmission(false)) {             // Try to become I2C Master, send data and collect bytes, keep master status for next request...
			Wire.requestFrom((int)addr, (int)size);           // send data n-bytes read
			if (Wire.available() == size) {
				for (byte i = 0; i < size; i++) {
					i2c_buffer = i2c_buffer << 8 | Wire.read();   // receive DATA
				}
			}
		}
		x--;
	} while (Wire.endTransmission(true) != 0 && x != 0);  // end transmission
	return (x);
}

uint8_t I2cRead8(uint8_t addr, uint8_t reg)
{
	I2cValidRead(addr, reg, 1);
	return (uint8_t)i2c_buffer;
}