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#include <stdio.h>
 
 
 
#define u8 unsigned char
u8 PFC_value[2];
 
typedef union { 
//volatile union {
   struct
   	{
   	 unsigned char HC1;
   	 unsigned char HC2;
   	 unsigned char CPR;
   	 unsigned char DCR;
   	 unsigned char ECH;
   	 unsigned char ECL;
   	 unsigned char EPR;
   	 unsigned char CYH;
   	 unsigned char CYL;
   	 unsigned char EBS;
   	 unsigned :16;
   	 unsigned :8;
   	 unsigned char DTI[3];
   	 unsigned char DT2[3];
   	 unsigned char PH2[3];
   	 unsigned char DR2;
   	 unsigned char DT3[3];
   	 unsigned char PH3[3];
   	 unsigned char DR3;
   	 unsigned :16; //char notused2[2];
   	 unsigned char ERC[160];
	 unsigned char Zero12VB[2];
	 unsigned char Zero12Is[2];
	 unsigned char Zero12Vs[2];
	 unsigned char Zero12VauxIs[2];
	 float Gain12VB;
	 float Gain12IS;
	 float Gain12Vs;
	 float Gain12VuaxIs;
   	 unsigned char notuse[8];
   	 unsigned char MFU[31];
   	 unsigned char VER;
 
   	};
   struct
   	{
   	 unsigned char HC1;
   	 unsigned char HC2;
   	 unsigned char CPR;
   	 unsigned char DCR;
   	 unsigned char ECH;
   	 unsigned char ECL;
   	 unsigned char EPR;
   	 unsigned char CYH;
   	 unsigned char CYL;
   	 unsigned char EBS;
   	 unsigned :16;
   	 unsigned :8;
   	 unsigned char DTI[3];
   	 unsigned char DT2[3];
   	 unsigned char PH2[3];
   	 unsigned char DR2;
   	 unsigned char DT3[3];
   	 unsigned char PH3[3];
   	 unsigned char DR3;
   	 unsigned :16; //char notused2[2];
   	 unsigned char ERC[160];
	 u16 Zero12VB;
	 u16 Zero12Is;
	 u16 Zero12Vs;
	 u16 Zero12VauxIs;
	 float Gain12VB;
	 float Gain12IS;
	 float Gain12Vs;
	 float Gain12VuaxIs;
   	 unsigned char notuse[8];
   	 unsigned char MFU[31];
   	 unsigned char VER;
 
   	}calibration;
  struct
  	{
  	 unsigned char EEPROM[256];
  	}ROM;
}EEPROM;
EEPROM Black_BOX;
 
 
void EEPageWriteI2C(unsigned int ControlByte,  unsigned char *data,unsigned char Length)
{
	int loop;
	IdleI2C();						//Ensure Module is Idle
	StartI2C();						//Generate Start COndition
	WriteI2C(ControlByte);			//Write Control byte
	IdleI2C();
 	tempadd1= &data;
	tempadd2= *data;
 
    for(loop=0;loop<Length;loop++)
    {
	WriteI2C(&data);					//Write Data
	IdleI2C();
	data++; 
    }
	StopI2C();						//Initiate Stop Condition
	Delay_mS(5);  
}
//=================================================================================================
// Funciton : void LDByteWriteI2C(unsigned int ControlByte, unsigned int LowAdd, unsigned int data)
//
// input parameter:Control Byte, 8 - bit address, data.
//
// output parameter:NONE
//
// Description :Write a byte to low density device at address LowAdd
//=================================================================================================
void LDByteWriteI2C(unsigned int ControlByte, unsigned int LowAdd, unsigned int data)
{
	IdleI2C();						//Ensure Module is Idle
	StartI2C();						//Generate Start COndition
	WriteI2C(ControlByte);			//Write Control byte
	IdleI2C();
 
 
	WriteI2C(LowAdd);				//Write Low Address
	IdleI2C();
 
 
	WriteI2C(data);					//Write Data
	IdleI2C();
	StopI2C();						//Initiate Stop Condition
	Delay_mS(5);
}
 
 
void main(void) 
{
    LDByteReadI2C(EE_ADDR,0x0001,&PFC_value,2);
	EEPageWriteI2C(EE_ADDR, &Black_BOX.ROM.EEPROM, 3);
}

prog.c:69:3: error: unknown type name ‘u16’
   u16 Zero12VB;
   ^
prog.c:70:3: error: unknown type name ‘u16’
   u16 Zero12Is;
   ^
prog.c:71:3: error: unknown type name ‘u16’
   u16 Zero12Vs;
   ^
prog.c:72:3: error: unknown type name ‘u16’
   u16 Zero12VauxIs;
   ^
prog.c: In function ‘EEPageWriteI2C’:
prog.c:93:2: warning: implicit declaration of function ‘IdleI2C’ [-Wimplicit-function-declaration]
  IdleI2C();      //Ensure Module is Idle
  ^
prog.c:94:2: warning: implicit declaration of function ‘StartI2C’ [-Wimplicit-function-declaration]
  StartI2C();      //Generate Start COndition
  ^
prog.c:95:2: warning: implicit declaration of function ‘WriteI2C’ [-Wimplicit-function-declaration]
  WriteI2C(ControlByte);   //Write Control byte
  ^
prog.c:97:3: error: ‘tempadd1’ undeclared (first use in this function)
   tempadd1= &data;
   ^
prog.c:97:3: note: each undeclared identifier is reported only once for each function it appears in
prog.c:98:2: error: ‘tempadd2’ undeclared (first use in this function)
  tempadd2= *data;
  ^
prog.c:106:2: warning: implicit declaration of function ‘StopI2C’ [-Wimplicit-function-declaration]
  StopI2C();      //Initiate Stop Condition
  ^
prog.c:107:2: warning: implicit declaration of function ‘Delay_mS’ [-Wimplicit-function-declaration]
  Delay_mS(5);  
  ^
prog.c: At top level:
prog.c:137:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main(void) 
      ^
prog.c: In function ‘main’:
prog.c:139:5: warning: implicit declaration of function ‘LDByteReadI2C’ [-Wimplicit-function-declaration]
     LDByteReadI2C(EE_ADDR,0x0001,&PFC_value,2);
     ^
prog.c:139:19: error: ‘EE_ADDR’ undeclared (first use in this function)
     LDByteReadI2C(EE_ADDR,0x0001,&PFC_value,2);
                   ^
prog.c:140:2: warning: passing argument 2 of ‘EEPageWriteI2C’ from incompatible pointer type [enabled by default]
  EEPageWriteI2C(EE_ADDR, &Black_BOX.ROM.EEPROM, 3);
  ^
prog.c:90:6: note: expected ‘unsigned char *’ but argument is of type ‘unsigned char (*)[256]’
 void EEPageWriteI2C(unsigned int ControlByte,  unsigned char *data,unsigned char Length)
      ^

Standard output is empty