/*********************************************************************
* Function: LDByteWriteI2C()
* Input: Control Byte, 8 - bit address, data.
* Overview: Write a byte to low density device at address LowAdd
********************************************************************/
unsigned int LDByteWriteI2C(unsigned char ControlByte, unsigned char LowAdd, unsigned char data)
{
unsigned int ErrorCode1;
unsigned int ErrorCode2;
IdleI2C(); //Ensure Module is Idle
StartI2C(); //Generate Start COndition
WriteI2C(ControlByte); //Write Control byte
IdleI2C();
ErrorCode1 = ACKStatus(); //Return ACK Status
WriteI2C(LowAdd); //Write Low Address
IdleI2C();
ErrorCode2 = ACKStatus(); //Return ACK Status
WriteI2C(data); //Write Data
IdleI2C();
StopI2C(); //Initiate Stop Condition
//EEAckPolling(ControlByte); //Perform ACK polling
if(ErrorCode1 == 0) { printf("ACK 1 not recieved"); }
if(ErrorCode2 == 0) { printf("ACK 2 not recieved"); }
//return(ErrorCode);
}
unsigned int LDByteWriteI2C(unsigned char ControlByte, unsigned char LowAdd, unsigned char data)
{
unsigned int ErrorCode;
IdleI2C();
StartI2C();
WriteI2C(ControlByte);
IdleI2C();
ErrorCode = ACKStatus();
WriteI2C(LowAdd);
IdleI2C();
ErrorCode = ACKStatus();
WriteI2C(data);
IdleI2C();
StopI2C();
EEAckPolling(ControlByte);
return(ErrorCode);
}
/*********************************************************************
* Function: LDByteWriteI2C()
*
* Input: Control Byte, 8 - bit address, data.
*
* Output: None.
*
* Overview: Write a byte to low density device at address LowAdd
*
* Note: None
********************************************************************/
unsigned int LDByteWriteI2C(unsigned char ControlByte, unsigned char LowAdd, unsigned char data)
{
unsigned int ErrorCode;
IdleI2C(); //Ensure Module is Idle
StartI2C(); //Generate Start COndition
WriteI2C(ControlByte); //Write Control byte
IdleI2C();
ErrorCode = ACKStatus(); //Return ACK Status
WriteI2C(LowAdd); //Write Low Address
IdleI2C();
ErrorCode = ACKStatus(); //Return ACK Status
WriteI2C(data); //Write Data
IdleI2C();
StopI2C(); //Initiate Stop Condition
EEAckPolling(ControlByte); //Perform ACK polling
return(ErrorCode);
}
int i2WriteData(char SlaveAddress, unsigned char Address, unsigned char Dada) {
// Pre: Bytes >= 0;
// Pre: El bit m‚s baix de Address no t‚ informaci¢ (ser… read o write)
// Post: retorna 0 si tot OK o 1 si hi ha un timeout d'un segon
// en un ack
unsigned int ErrorCode;
IdleI2C(); //Ensure Module is Idle
StartI2C(); //Generate Start COndition
WriteI2C((SlaveAddress << 1) & 0xfffe); //Write Control byte
IdleI2C();
ErrorCode = ACKStatus(); //Return ACK Status
WriteI2C(Address); //Write Low Address
IdleI2C();
ErrorCode = ACKStatus(); //Return ACK Status
WriteI2C(Dada); //Write Data
IdleI2C();
StopI2C(); //Initiate Stop Condition
return(ErrorCode);
}
/*********************************************************************
* Function: EEAckPolling()
* Input: Control byte.
* Output: Error state.
* Overview: Polls the bus for an Acknowledge from device
********************************************************************/
unsigned int EEAckPolling(unsigned char control)
{
IdleI2C(); //wait for bus Idle
StartI2C(); //Generate Start condition
if(I2C1STATbits.BCL)
{
return(-1); //Bus collision, return
}
else
{
if(WriteI2C(control))
{
return(-3); //error return
}
IdleI2C(); //wait for bus idle
if(I2C1STATbits.BCL)
{
return(-1); //error return
}
while(ACKStatus())
{
RestartI2C(); //generate restart
if(I2C1STATbits.BCL)
{
return(-1); //error return
}
if(WriteI2C(control))
{
return(-3);
}
IdleI2C();
}
}
StopI2C(); //send stop condition
if(I2C1STATbits.BCL)
{
return(-1);
}
return(0);
}
