i2c.h

PIC18F4520 + TW8806B ucosII+net test program source

/*==============	⒀ Port Initialize Routine ⑿  =========================================
**     Filename	: I2C.H
**     PIC I2C Routine
**     (c) Copyright WOORY⑩ Industrial Company Limited. 1991-2004
================================================================================*/

/*==============	⒀ I2C Initialize Routine ⑿  =========================================*/
void I2C_Initialize(void)
{
	SSPCON1	= 0B00101000;	// I2C Master Mode Enable
	SSPSTAT	= 0B10000000;	// Slew rate = 100KHz and 1MHz Mode
	SSPADD	= 0B00001001;	// I2C Speed = Fosc / (4x(SSPADD +1)) = 400KHz
	SSPCON2	= 0B00000000;	// I2C Data Transfer Leady
	return;
}

/*==============	⒀ I2C Wait Routine ⑿  =============================================*/
void I2C_Wait(void)
{
	while(!(PIR1 & 0x08));	// Check PIR1 in SSPIF Bit	
	PIR1 &= 0B11110111;	// Clear PIR1 in SSPIF Bit
	return;
}

/*==============	⒀ I2C Start Condition Routine ⑿  ====================================*/
void I2C_Start(void)
{
	SSPCON2 |= 0x01;		// Generate START Condition(SEN  = 1)
 	I2C_Wait();		// Wait for data to arrive
 	return;
}

/*==============	⒀ I2C Stop Condition Routine ⑿  ====================================*/
void I2C_Stop(void)
{
	SSPCON2 |= 0x04;		// Generate START Condition(PEN  = 1)
	I2C_Wait();		// Wait for data to arrive
	return;
}

/*==============	⒀ I2C ACK Output Routine ⑿  =======================================*/
void I2C_Ack(void)
{
	SSPCON2 &= 0B11011111;	// ACK Data to Send is 0 (ACKDT = 0)
	SSPCON2 |= 0x10;		// Send ACK Data Now (ACKEN = 1)
	I2C_Wait();		// Wait for Data to Arrive
	return;
}	

/*==============	⒀ I2C ACK Read Routine ⑿  ========================================*/
unsigned char I2C_Read_Ack(void)	//Check ACK Status ACKSTAT bit
{
	if(SSPCON2 & 0x40)return(1);
	else return(0);
}

/*==============	⒀ I2C ReStart Condition Routine ⑿  ==================================*/
void I2C_Restart(void)
{
	SSPCON2 |= 0x02;		// Generate Restart Condition bit RSEN
   	I2C_Wait();		// Wait for data to arrive
	return;
}

/*==============	⒀ I2C Initialize Routine Routine ⑿  ===================================*/
void I2C_Nak(void)
{
	SSPCON2 |= 0x20;		// ACK Data to Send is 1 (ACKDT = 1)
	SSPCON2 |= 0x10;		// Send ACK Data Now (ACKEN = 1)
	I2C_Wait();		// Wait for data to arrive
	return;
}

/*==============	⒀ I2C Initialize Routine Routine ⑿  ===================================*/
void I2C_Transmit(unsigned char Data)
{
	SSPBUF = Data;		// Load DATA to send
	I2C_Wait();		// Wait for data to arrive
	return;
}

/*==============	⒀ I2C Initialize Routine Routine ⑿  ===================================*/
unsigned char I2C_Receive(void)
{
	SSPCON2 |= 0x08;		// Enable I2C receiver	
	I2C_Wait();		// Wait for data to arrive
	return(SSPBUF);
}

/*==============	⒀ End of System Main Control Routine ⑿  ==============================*/