; PIC18 in C - Versione 0.1 - aprile 2016
; Copyright (c) 2016, Vincenzo Villa
; Creative Commons | Attribuzione - Condividi allo stesso modo 4.0 Internazionale (CC BY-SA 4.0)
; Creative Commons | Attribution-Share Alike 4.0 Unported
; https://www.vincenzov.net/tutorial/PIC18/i2c-mcc.htm    
; PIC18F25K50 / MPLAB X 3.26 / XC8 1.37 / MCC 3.0.5
; I2C master: TC74, write + read with Transaction Request Blocks

/**
  Generated Main Source File

  Company:
    Microchip Technology Inc.

  File Name:
    main.c

  Summary:
    This is the main file generated using MPLAB(c) Code Configurator

  Description:
    This header file provides implementations for driver APIs for all modules selected in the GUI.
    Generation Information :
        Product Revision  :  MPLAB(c) Code Configurator - v3.00
        Device            :  PIC18F25K50
        Driver Version    :  2.00
    The generated drivers are tested against the following:
        Compiler          :  XC8 1.35
        MPLAB             :  MPLAB X 3.20
 */

/*
Copyright (c) 2013 - 2015 released Microchip Technology Inc.  All rights reserved.

Microchip licenses to you the right to use, modify, copy and distribute
Software only when embedded on a Microchip microcontroller or digital signal
controller that is integrated into your product or third party product
(pursuant to the sublicense terms in the accompanying license agreement).

You should refer to the license agreement accompanying this Software for
additional information regarding your rights and obligations.

SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF
MERCHANTABILITY, TITLE, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL MICROCHIP OR ITS LICENSORS BE LIABLE OR OBLIGATED UNDER
CONTRACT, NEGLIGENCE, STRICT LIABILITY, CONTRIBUTION, BREACH OF WARRANTY, OR
OTHER LEGAL EQUITABLE THEORY ANY DIRECT OR INDIRECT DAMAGES OR EXPENSES
INCLUDING BUT NOT LIMITED TO ANY INCIDENTAL, SPECIAL, INDIRECT, PUNITIVE OR
CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF PROCUREMENT OF
SUBSTITUTE GOODS, TECHNOLOGY, SERVICES, OR ANY CLAIMS BY THIRD PARTIES
(INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF), OR OTHER SIMILAR COSTS.
 */

#include "mcc_generated_files/mcc.h"

#define TC74_ADDR 0x4D
#define TC74_RTR 0

void main(void) {

    uint8_t readBuffer[10]; // Data from slave will be put here
    uint8_t writeBuffer[10]; // Data to write to slave
    I2C1_TRANSACTION_REQUEST_BLOCK TRB[2]; // List of I2C transactions
    I2C1_MESSAGE_STATUS status; // I2C status

    SYSTEM_Initialize(); // Initialize the device
    // Inside: I2C1_Initialize() - Initializes the MSSP
    //         Manually set RB0 and RB1 as digital input

    INTERRUPT_GlobalInterruptHighEnable(); // Enable high priority global interrupts
    INTERRUPT_GlobalInterruptLowEnable(); // Enable low priority global interrupts.

    while (1) {
        writeBuffer[0] = TC74_RTR; //  Data sent to slave (TC74 register 0)

        // Prepare Transaction Request Blocks (TRB) 
        I2C1_MasterWriteTRBBuild(&TRB[0], writeBuffer, 1, TC74_ADDR);
        I2C1_MasterReadTRBBuild(&TRB[1], readBuffer, 1, TC74_ADDR);

        I2C1_MasterTRBInsert(2, TRB, &status); // Insert TRB into I2C queue

        // wait for the message to be sent or status has changed.
        // while (status == I2C1_MESSAGE_PENDING);

        // if (status == I2C1_MESSAGE_COMPLETE); - Alle queue TRB sent...

        __delay_ms(1);
    }
}