MCP9804-ESLASHMS datasheet(46/54 Pages) MICROCHIP

46 / 54 page

MCP9804

DS22203A-page 46

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

Function Name:

ReadI2C2

Return Value:

contents of SSP2BUF register

Parameters:

ACK = 1 and NAK = 0

Description:

Read a byte from I2C bus and ACK/NAK

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

unsigned char ReadI2C(unsigned char ACK)

{

while (SSPSTATbits.BF);

SSPCON2bits.RCEN = 1;

// enable master for 1 byte reception

while (!SSPSTATbits.BF);

// wait until byte received

if ACK

ACKI2C();

// Give ACK

else

nACK();

return (SSPBUF);

// return with read byte

}

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

Function Name:

AckI2C

Return Value:

void

Parameters:

void

Description:

Initiate ACK bus condition.

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

void ACKI2C(void)

{

PIR1bits.SSPIF = 0;

SSPCON2bits.ACKDT = 0;

// set acknowledge bit state for ACK

SSPCON2bits.ACKEN = 1;

// initiate bus acknowledge sequence

while(!PIR1bits.SSPIF);

PIR1bits.SSPIF = 0;

}

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

Function Name:

nACKI2C

Return Value:

void

Parameters:

void

Description:

Initiate no-ACK bus condition.

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

void nACK(void)

{

PIR1bits.SSPIF = 0;

SSPCON2bits.ACKDT = NACK;

//Disable ACK

SSPCON2bits.ACKEN = 1;

//Start ACK sequence

while(!PIR1bits.SSPIF);

//Wait for flag to set

PIR1bits.SSPIF = 0;

}

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

Function Name:

WaitForACK

Return Value:

void

Parameters:

void

Description:

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

void WaitForACK(void)

{

PIR1bits.SSPIF = 0;

//Clear Interrupt

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

PIR1bits.SSPIF = 0;//Clear Interrupt

}

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