MCP9808 datasheet(45/52 Pages) MICROCHIP

45 / 52 page

DS25095A-page 47

MCP9808

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

Function Name:

i2c_write

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 i2c_write( unsigned char i2cWriteData ) {

PIR1bits.SSPIF = 0; // clear interrupt

while ( SSPSTATbits.BF ) ;

// wait for idle condition

SSPBUF = i2cWriteData;

// Load SSPBUF with i2cWriteData (the value to be transmit-

ted)

while (!PIR1bits.SSPIF) ;

// wait for a flag to be set

PIR1bits.SSPIF = 0; // clear flag

return ( !SSPCON2bits.ACKSTAT ); // function returns '1' if transmission is acknowledged

}

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

Function Name:

i2c_read

Return Value:

contents of SSP2BUF register

Parameters:

ack = 1 and nak = 0

Description:

Read a byte from I2C bus and ACK/NAK device

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

unsigned char i2c_read( unsigned char ack ) {

unsigned char i2cReadData;

PIR1bits.SSPIF = 0;// clear interrupt

while ( SSPSTATbits.BF ) ; // wait for idle condition

SSPCON2bits.RCEN = 1;

// enable receive mode

while (!PIR1bits.SSPIF) ; // wait for a flag to be set

PIR1bits.SSPIF = 0;// clear flag

i2cReadData = SSPBUF;

// Read SSPBUF and put it in i2cReadData

if ( ack ) {

// if ack=1

SSPCON2bits.ACKDT = 0;

then transmit an Acknowledge

} else {

SSPCON2bits.ACKDT = 1;

otherwise transmit a Not Acknowledge

}

SSPCON2bits.ACKEN = 1;

// send acknowledge sequence

while (!PIR1bits.SSPIF) ; // wait for a flag to be set

PIR1bits.SSPIF = 0;// clear flag

return( i2cReadData );

// return the value read from SSPBUF

}

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