//PIN 18 -> RC3 -> SCL
//PIN 23 -> RC4 ->SDA

#include "i2c.h"
#include "conf.h"

void I2C_Master_Init(const unsigned long freq_K) //Begin IIC as master
{
    TRISC3 = 1;
    TRISC4 = 1; //Set SDA and SCL pins as input pins

    SSPCON = 0b00101000; //pg84/234 
    SSPCON2 = 0b00000000; //pg85/234

    //SSPADD = (_XTAL_FREQ/(4*freq_K*100))-1; //Setting Clock Speed pg99/234
    SSPADD = 49;

    //SSPSTAT: SMP:CKE:D/!A:P:S:R/!W/:U:BF *U unimplemented read as 0
    SMP = 1; // Disable slew rate
    CKP = 0; // Data transmitted on rising edge of SCK  
}

void I2C_Master_Wait() {
    while ((SSPCON2 & 0b00011111) || (SSPSTAT & 0b00000100)); //check the bis on registers to make sure the IIC is not in progress
}

void I2C_Master_Start() {
    I2C_Master_Wait(); //Hold the program if I2C is busy  
    SEN = 1; //Begin IIC pg85/234
}

void I2C_Master_Repeated_Start() {
    I2C_Master_Wait();
    RSEN = 1; //Initiate repeated start condition
}

void I2C_Master_Stop() {
    I2C_Master_Wait(); //Hold the program is I2C is busy  
    PEN = 1; //End IIC pg85/234
}

void I2C_Master_Write(unsigned data) {
    I2C_Master_Wait(); //Hold the program is I2C is busy 
    SSPBUF = data; //pg82/234
}

unsigned short I2C_Master_Read(unsigned short ack) {
    unsigned short incoming;
    I2C_Master_Wait();
    RCEN = 1;

    I2C_Master_Wait();
    incoming = SSPBUF; //get the data saved in SSPBUF

    I2C_Master_Wait();
    ACKDT = (ack) ? 0 : 1; //check if ack bit received  
    ACKEN = 1; //pg 85/234

    return incoming;
}