MCP9808T-E/MS【PDF 45/52 页】IC TEMP SENSOR DGTL I2C 8MSOP

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Sheet目录44

41页 42页 43页 44页 [45页]46页 47页 48页 49页

?2011 Microchip Technology Inc.

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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