MCP9804-ESLASHMS datasheet(45/54 Pages) MICROCHIP

45 / 54 page

DS22203A-page 45

MCP9804

/********************************************************************

Function Name:

I2CReStart

Return Value:

void

Parameters:

void

Description:

********************************************************************/

void I2CReStart(void)

{

PIR1bits.SSPIF = 0;//Clear Interrupt

SSPCON2bits.RSEN = 1;

while(!PIR1bits.SSPIF);//Wait for data received Interrupt

PIR1bits.SSPIF = 0;//Clear Interrupt

}

/********************************************************************

Function Name:

I2CStop

Return Value:

void

Parameters:

void

Description:

Stop bit

********************************************************************/

void I2CStop(void)

{

PIR1bits.SSPIF = 0;//Clear Interrupt

if (!SSPSTATbits.P)

{

SSPCON2bits.PEN = 1;

//Stop condition

while(SSPCON2bits.PEN); //wait for STOP

if (PIR2bits.BCLIF)

PIR2bits.BCLIF = 0;

while(!PIR1bits.SSPIF);

//Wait for flag to set

PIR1bits.SSPIF = 0;

}

/********************************************************************

Function Name:

WriteI2C2

Return Value:

Status byte for WCOL detection.

Parameters:

Single data byte for I2C2 bus.

Description:

This routine writes a single byte to the

I2C2 bus.

********************************************************************/

unsigned char WriteI2C( unsigned char data_out )

{

SSPBUF = data_out;

// write single byte to SSP2BUF

if ( SSPCON1bits.WCOL )

// test if write collision occurred

return ( -1 );

// if WCOL bit is set return negative #

else

{

while( SSPSTATbits.BF );

// wait until write cycle is complete

WaitForACK();//wait for ACK from device

return ( 0 );

// if WCOL bit is not set return non-negative #

}

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