iic.c

MSP430FE42X防窍电电表DEMO（编译器IAR3.42)

void Delay_Wmax(void)
{
	int i;	
	for(i=0;i<800;i++);
	_NOP();
}

void RW_I2C_Start(void)
{	
#ifdef	EE_IO_COM
	EE_CON_OUT |= (EE_SDA_BIT+EE_SCL_BIT);
	EE_CON_DIR |= (EE_SDA_BIT+EE_SCL_BIT);
#else
	EE_SCL_OUT &= ~EE_SCL_BIT;
	EE_SCL_DIR |= EE_SCL_BIT;
	EE_SDA_OUT &= ~EE_SDA_BIT;
	EE_SDA_DIR |= EE_SDA_BIT;
#endif
	_NOP();
	_NOP();
	EE_SDA_OUT &= ~EE_SDA_BIT;
	_NOP();
	_NOP();
	EE_SCL_OUT &= ~EE_SCL_BIT;
}

void RW_I2C_Stop(void)
{
	EE_SDA_DIR |= EE_SDA_BIT;
	
	EE_SDA_OUT &= ~EE_SDA_BIT;
	_NOP();
	_NOP();
	EE_SCL_OUT |= EE_SCL_BIT;
	_NOP();
	_NOP();
	EE_SDA_OUT |= EE_SDA_BIT;
}


unsigned char W_I2C_Byte( unsigned char data )			//read or write command  (0xAF read; OxAE write)
{											               			//start + 1010xxx (read or write start)
#define TESTASKTIME   2
	unsigned char i;
	unsigned char testask=0;

	EE_SDA_DIR |= EE_SDA_BIT;
	
	for(i=1;i<=8;i++)
	{
		if ((data&0x80)==0x80) EE_SDA_OUT |= EE_SDA_BIT;
		else EE_SDA_OUT &= ~EE_SDA_BIT;
		data <<=1;
		_NOP();
		_NOP();
		EE_SCL_OUT |= EE_SCL_BIT;
		_NOP();
		_NOP();
		EE_SCL_OUT &= ~EE_SCL_BIT;
		_NOP();
		_NOP();
	}
	
	EE_SDA_DIR &= ~EE_SDA_BIT;
	EE_SCL_OUT |= EE_SCL_BIT;
	i=TESTASKTIME;
	while(i)
	{
		if((EE_SDA_IN&EE_SDA_BIT)!=EE_SDA_BIT){testask=1;break;}
		else testask=0;
		i--;
	}
	EE_SCL_OUT &= ~EE_SCL_BIT;
	
	return testask;
}

unsigned char R_I2C_Ryte(unsigned char ackto )
{
	unsigned char i;
	unsigned char data=0;
	
	EE_SDA_DIR &= ~EE_SDA_BIT;
	for(i=1;i<=8;i++)
	{
		EE_SCL_OUT |= EE_SCL_BIT;
		data <<=1;
		if ((EE_SDA_IN&EE_SDA_BIT)==EE_SDA_BIT) data |=0x01;
		EE_SCL_OUT &= ~EE_SCL_BIT;
		_NOP();
	}
	if(ackto) EE_SDA_OUT &= ~EE_SDA_BIT;
	else EE_SDA_OUT |= EE_SDA_BIT;
	EE_SDA_DIR |= EE_SDA_BIT;
	_NOP();
	_NOP();
	EE_SCL_OUT |= EE_SCL_BIT;
	_NOP();
	_NOP();
	EE_SCL_OUT &= ~EE_SCL_BIT;
	return data;
}

void W_I2C_Bytes( unsigned char *Ram_Addr, unsigned char I2C_Addr1, unsigned int I2C_Addr2,
              unsigned char nLen)
{
	//unsigned int HighAdress;
	//RW_I2C_Start();
	
	
	
	RW_I2C_Start();
  W_I2C_Byte( I2C_Addr1 );
	W_I2C_Byte( I2C_Addr2 );
	
	for( ; nLen>0; nLen-- )
	{
		W_I2C_Byte( *Ram_Addr );
		Ram_Addr++;
	}
	RW_I2C_Stop();
	
	do
	{
		RW_I2C_Start();
	}
	while(!(W_I2C_Byte( I2C_Addr1 )));
	RW_I2C_Stop();
}



void R_I2C_Bytes( unsigned char *Ram_Addr, unsigned char I2C_Addr1, unsigned int I2C_Addr2,
              unsigned int nLen)
{	
  RW_I2C_Start();
  W_I2C_Byte( I2C_Addr1 );
	W_I2C_Byte( I2C_Addr2 );

	RW_I2C_Start();
	W_I2C_Byte( I2C_Addr1 |0x01);
	for( ; nLen>0; nLen-- )
	{
		*Ram_Addr = R_I2C_Ryte(nLen-1);
		Ram_Addr++;
	}
	RW_I2C_Stop();
}


void W_Bytes( unsigned char *Ram_Addr, unsigned char I2C_Addr1, unsigned int I2C_Addr2,
              unsigned int nLen)
{
  for( ; nLen>0; nLen-- )
	{
		RW_I2C_Start();
    W_I2C_Byte( I2C_Addr1 );
		W_I2C_Byte( I2C_Addr2 );
		W_I2C_Byte( *Ram_Addr );
		RW_I2C_Stop();
		I2C_Addr2++;
		if(I2C_Addr2>0x00ff){I2C_Addr2=0x00;I2C_Addr1 += 2;}
		Ram_Addr++;
		do
	  {
		  RW_I2C_Start();
	  }
	  while(!(W_I2C_Byte( I2C_Addr1 )));
	  RW_I2C_Stop();
	}
}


void R_Bytes( unsigned char *Ram_Addr, unsigned char I2C_Addr1, unsigned int I2C_Addr2,
              unsigned int nLen)
{	

  RW_I2C_Start();
  for( ; nLen>0; nLen-- )
	{
		RW_I2C_Start();
		W_I2C_Byte( I2C_Addr1 );
		W_I2C_Byte( I2C_Addr2 );
		RW_I2C_Start();
		W_I2C_Byte( I2C_Addr1 |0x01);
		*Ram_Addr = R_I2C_Ryte(0);
		RW_I2C_Stop();
		I2C_Addr2++;
		if(I2C_Addr2>0x00ff){I2C_Addr2=0x0000,I2C_Addr1 += 2;}
		Ram_Addr++;
	}
}
void New_E2prom_Ini(void)
{


}

void Old_E2prom_Ini(void)
{


}