; 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: TSL2561, 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 TSL2561_ADDR 0x29  // (0x29 or 0x39 or 0x49) Table 1 Slave Address Selection
#define TSL2561_CONTROL 0x80 // Table 3. Command Register
#define TSL2561_ON 0x03 // Table 4. Control Register
#define TSL2561_CH0 0xAC //Table 12. ADC Channel Data Registers
#define TSL2561_CH1 0xAE //Table 12. ADC Channel Data Registers
#define TSL2561_CH0_CH1 0x9C //Table 12. Dual ADC Channel Data Registers
#define TSL2561_GAIN 0x81 // Table 5. Timing Register
#define TSL2561_H_GAIN 0x12 // Gain X 16, 400 ms

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 readTRB[2]; // List of I2C transactions
    I2C1_MESSAGE_STATUS status; // I2C status
    unsigned int infrared, visiblePlusInfrared;

    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.

    // Power On TSL2561
    writeBuffer[0] = TSL2561_CONTROL;
    writeBuffer[1] = TSL2561_ON;
    I2C1_MasterWrite(writeBuffer, 2, TSL2561_ADDR, &status);

    while (status == I2C1_MESSAGE_PENDING); // Wait end of transaction

    // Set high gain (only indoor)
    writeBuffer[0] = TSL2561_GAIN;
    writeBuffer[1] = TSL2561_H_GAIN;
    I2C1_MasterWrite(writeBuffer, 2, TSL2561_ADDR, &status);

    while (status == I2C1_MESSAGE_PENDING); // Wait end of transaction

    while (1) {
        // Read CH1 and CH2 as 4 byte block 
        writeBuffer[0] = TSL2561_CH0_CH1; //  Data sent to slave (TSL2561 register for CH1)
        // Prepare Transaction Request Blocks (TRB) 
        I2C1_MasterWriteTRBBuild(&readTRB[0], writeBuffer, 1, TSL2561_ADDR);
        I2C1_MasterReadTRBBuild(&readTRB[1], readBuffer, 4, TSL2561_ADDR);
        I2C1_MasterTRBInsert(2, readTRB, &status); // Insert TRB into I2C queue

        while (status == I2C1_MESSAGE_PENDING); // Wait end of transaction
        
        visiblePlusInfrared = (((unsigned int) readBuffer[1] << 8) + readBuffer[0]);
        infrared = (((unsigned int) readBuffer[3] << 8) + readBuffer[2]);

        __delay_ms(10);
    }
}