/* 
 * File:   pic16f_i2c.c
 * Author: www.henteko.org
 *
 * Created on 2021/07/29, 17:15
 */

#include <xc.h>
#include "pic16f_i2c.h"

void InitI2C() {
    SSP1CLKPPS = 0b10100;	// RC5
    SSP1DATPPS = 0b10101;	// RC4
    
    SSP1CON1 = 0b00101000;	// I2C master : clock = FOSC / (4 * (SPP1ADD+1))
	SSP1CON2 = 0;
    SSP1STAT = 0b10000000;	// I2C standard speed mode
    SSP1ADD = 0x13;			// 19  :  32000000 / (4 * (19 + 1)) = 400000
}

void StartI2C() {
    SSP1CON2bits.SEN = 1;
    WaitI2C();
}

void StopI2C() {
    SSP1CON2bits.PEN = 1;
    WaitI2C();
}

void WriteI2C(unsigned char data) {
    SSP1BUF = data;
    WaitI2C();
}

void WaitI2C() {
    while((SSP1STAT & 0x04) || (SSP1CON2 & 0x1F));
}