/*========================================================================
 * File:   i2C_function.c
 * Author: VividHobby
 *
 *========================================================================
 */

#include <xc.h>

//---------------------------------------------------------------------
// i2C 処理関数
//---------------------------------------------------------------------

//=== 変数定義 ===

unsigned char read_data, write_data; // i2C 入出力データ
unsigned char slv_adrs; // slave address = 0bXXXX XXX- 

//----------------------------------
// i2C 初期化
//----------------------------------

void i2c_init_setup(void) {
    SSPM3 = 1;
    SSPM2 = 0;
    SSPM1 = 0;
    SSPM0 = 0;
    SMP = 1;
    CKE = 0;
    SSPADD = 0x3F;
    SSPEN = 1;
    WCOL = 0;
    SSPOV = 0;
}


//----------------------------------
// i2C START Condition
//----------------------------------

void i2C_start(void) {
    SEN = 1;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
}


//----------------------------------
// i2C Re-START Condition
//----------------------------------

void i2C_restart(void) {
    RSEN = 1;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
}


//-----------------------------------
// i2C STOP Condition
//-----------------------------------

void i2c_stop(void) {
    PEN = 1;
    while (SSPIF == 0);
    SSPIF = 0;
}

//------------------------------------
// i2C READ one : read_data
//------------------------------------

unsigned char i2C_read_one() {
    ACKDT = 1;
    RCEN = 1;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    read_data = SSPBUF;
    SSPIF = 0;
    ACKEN = 1;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
    return read_data;
}


//------------------------------------
// i2C READ Continue : read_data
//------------------------------------

unsigned char i2C_read_multi() {

    ACKDT = 0;
    RCEN = 1;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    read_data = SSPBUF;
    SSPIF = 0;
    ACKEN = 1;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
    return read_data;
}


//-------------------------------------
// i2C Send slave address for read 
//-------------------------------------

void i2c_send_sa_read(slv_adrs) {
    while (BF == 1); //BFが0になるまで待つ。１の間繰り返す。
    SSPBUF = slv_adrs + 1;
    SSPIF = 0;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
}
//-------------------------------------
// i2C Send slave address for write
//-------------------------------------

void i2c_send_sa_write(slv_adrs) {
    while (BF == 1); //BFが0になるまで待つ。１の間繰り返す。
    SSPBUF = slv_adrs;
    SSPIF = 0;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
}


//-------------------------------------
// i2C WRITE (write_data)
//-------------------------------------
void i2C_write(unsigned char parameter) {

    while (BF == 1); //BFが0になるまで待つ。１の間繰り返す。
    SSPBUF = write_data;
    SSPIF = 0;
    while (SSPIF == 0); //SSPIFが1になるまで待つ。０の間繰り返す
    SSPIF = 0;
}



//------------------------------------------
// メインプログラムを記述
//------------------------------------------

void main(void) {




    return;
}