#include "i2c_lib.h"
//------------------------------------------------------------------------------
/*
* Function: I2CInit
* Return:
* Arguments:
* Description: Initialize I2C in master mode, Sets the required baudrate
*/
void I2CInit(void)
{
TRISC3 = 1; /* SDA and SCL as input pin */
TRISC4 = 1; /* these pins can be configured either i/p or o/p */
SSPSTAT |= 0x80; /* Slew rate disabled */
SSPCON = 0x28; /* SSPEN = 1, I2C Master mode, clock = FOSC/(4 * (SSPADD + 1)) */
SSPADD = 0x28; /* 100Khz @ 4Mhz Fosc */
}
//------------------------------------------------------------------------------
/*
* Function: I2CStart
* Return:
* Arguments:
* Description: Send a start condition on I2C Bus
*/
void I2CStart()
{
SEN = 1; /* Start condition enabled */
while (SEN); /* automatically cleared by hardware */
/* wait for start condition to finish */
}
//------------------------------------------------------------------------------
/*
* Function: I2CStop
* Return:
* Arguments:
* Description: Send a stop condition on I2C Bus
*/
void I2CStop()
{
PEN = 1; /* Stop condition enabled */
while (PEN); /* Wait for stop condition to finish */
/* PEN automatically cleared by hardware */
}
//------------------------------------------------------------------------------
/*
* Function: I2CRestart
* Return:
* Arguments:
* Description: Sends a repeated start condition on I2C Bus
*/
void I2CRestart()
{
RSEN = 1; /* Repeated start enabled */
while (RSEN); /* wait for condition to finish */
}
//------------------------------------------------------------------------------
/*
* Function: I2CAck
* Return:
* Arguments:
* Description: Generates acknowledge for a transfer
*/
void I2CAck()
{
ACKDT = 0; /* Acknowledge data bit, 0 = ACK */
ACKEN = 1; /* Ack data enabled */
while (ACKEN); /* wait for ack data to send on bus */
}
//------------------------------------------------------------------------------
/*
* Function: I2CNck
* Return:
* Arguments:
* Description: Generates Not-acknowledge for a transfer
*/
void I2CNak()
{
ACKDT = 1; /* Acknowledge data bit, 1 = NAK */
ACKEN = 1; /* Ack data enabled */
while (ACKEN); /* wait for ack data to send on bus */
}
//------------------------------------------------------------------------------
/*
* Function: I2CWait
* Return:
* Arguments:
* Description: wait for transfer to finish
*/
void I2CWait()
{
while ((SSPCON2 & 0x1F) || (SSPSTAT & 0x04));
/* wait for any pending transfer */
}
//------------------------------------------------------------------------------
/*
* Function: I2CSend
* Return:
* Arguments: dat - 8-bit data to be sent on bus
* data can be either address/data byte
* Description: Send 8-bit data on I2C bus
*/
void I2CSend(unsigned char dat)
{
SSPBUF = dat; /* Move data to SSPBUF */
//#### ACA SE CLAVA ####
while (BF); /* wait till complete data is sent from buffer */
I2CWait(); /* wait for any pending transfer */
}
//------------------------------------------------------------------------------
/*
* Function: I2CRead
* Return: 8-bit data read from I2C bus
* Arguments:
* Description: read 8-bit data from I2C bus
*/
unsigned char I2CRead(void)
{
unsigned char temp;
/* Reception works if transfer is initiated in read mode */
RCEN = 1; /* Enable data reception */
while (!BF); /* wait for buffer full */
temp = SSPBUF; /* Read serial buffer and store in temp register */
I2CWait(); /* wait to check any pending transfer */
return temp; /* Return the read data from bus */
}
//------------------------------------------------------------------------------