main.c
/**
  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 - 4.15
        Device            :  PIC16F1823
        Driver Version    :  2.00
    The generated drivers are tested against the following:
        Compiler          :  XC8 1.35
        MPLAB             :  MPLAB X 3.40
*/

/*
    (c) 2016 Microchip Technology Inc. and its subsidiaries. You may use this
    software and any derivatives exclusively with Microchip products.

    THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
    EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED
    WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
    PARTICULAR PURPOSE, OR ITS INTERACTION WITH MICROCHIP PRODUCTS, COMBINATION
    WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION.

    IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
    INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
    WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
    BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE
    FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN
    ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
    THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.

    MICROCHIP PROVIDES THIS SOFTWARE CONDITIONALLY UPON YOUR ACCEPTANCE OF THESE
    TERMS.
*/

#include "mcc_generated_files/mcc.h"
#include "mcc_generated_files/mtouch/mtouch_button.h"

// ---------------------- constants ---------------------------

#define SHORT_OFF_TICKS 20
#define ON_GUARD_TICKS 20

const uint16_t expTable[] = {2 ,2 ,2 ,2 ,3 ,3 ,3 ,4 ,5 ,6 ,8 ,9 ,11 ,12 ,14 ,16 ,18 ,20 ,23 ,25
 ,28 ,30 ,33 ,36 ,39 ,42 ,46 ,49 ,53 ,56 ,60 ,64 ,68 ,72 ,77 ,81 ,86 ,90 ,95 ,100 ,105 ,110 ,116
 ,121 ,127 ,132 ,138 ,144 ,150 ,156 ,163 ,169 ,176 ,182 ,189 ,196 ,203 ,210 ,218 ,225 ,233 ,240
 ,248 ,256 ,264 ,272 ,281 ,289 ,298 ,306 ,315 ,324 ,333 ,342 ,352 ,361 ,371 ,380 ,390 ,400 ,410
 ,420 ,431 ,441 ,452 ,462 ,473 ,484 ,495 ,506 ,518 ,529 ,541 ,552 ,564 ,576 ,588 ,600 ,613 ,625
 ,638 ,650 ,663 ,676 ,689 ,702 ,716 ,729 ,743 ,756 ,770 ,784 ,798 ,812 ,827 ,841 ,856 ,870 ,885
 ,900 ,915 ,930 ,946 ,961 ,977 ,992 ,1008 ,1023
};

#define MAX_PWM_PERIOD_IDX (sizeof(expTable) / sizeof(uint16_t) - 1)

// ------------------ global variables ------------------------
volatile static struct
{
    unsigned    lampOnGuard:1;
    unsigned    lampOn:1;
    unsigned    pwmDirty:1;
    unsigned    tickSync:1;
} globalflags;

volatile uint16_t ticks;

// --------------------------------------------------------------
/*
                         Main application
 */
void main(void)
{
    mtouch_buttonmask_t bs, buttonsState = 0;
    uint16_t pressTick;
    uint16_t pwmDutyPeriod = MAX_PWM_PERIOD_IDX / 2;
    
    ticks = 0;
    globalflags.lampOnGuard = 0;
    globalflags.lampOn = 0;
    globalflags.pwmDirty = 1;
    globalflags.tickSync = 0;
    // initialize the device
    SYSTEM_Initialize();

//    Led1_SetLow();
//    Led2_SetHigh();
//    for(bs = 0; bs < 10; bs++) {
//        __delay_ms(100);
//        Led1_Toggle();
//        Led2_Toggle();
//    }
    
//    TMR2_SetInterruptHandler(timerCallback);
    // When using interrupts, you need to set the Global and Peripheral Interrupt Enable bits
    // Use the following macros to:

    // Enable the Global Interrupts
    INTERRUPT_GlobalInterruptEnable();

    // Enable the Peripheral Interrupts
    INTERRUPT_PeripheralInterruptEnable();

    // Disable the Global Interrupts
    //INTERRUPT_GlobalInterruptDisable();

    // Disable the Peripheral Interrupts
    //INTERRUPT_PeripheralInterruptDisable();

//    printf("---- Starting main loop ----");
    Led1_SetLow();
    Led2_SetLow();
    LedEn_SetLow();
    while (1)
    {
        // TODO add some error indication
        if(MTOUCH_Service_Mainloop() == false)
            continue;
        
        // save previous buttons state for press/release detection
        bs = buttonsState;
        buttonsState = MTOUCH_Button_Buttonmask_Get();

        // show buttons state on leds
        if(buttonsState & (1 << ButtonUp)) {
            Led1_SetHigh();
        } else {
            Led1_SetLow();
        }
        
        if(buttonsState & (1 << ButtonDown)) {
            Led2_SetHigh();
        } else {
            Led2_SetLow();
        }
        
        // any button state changed
        if(bs ^ buttonsState) {
            if(buttonsState == 0) {
                // all buttons depressed
                // turn lamp off if depressed after very short period
                // lamp can be turned on by short click
                // guard time prevents lamp turning off in that case
                if(ticks - pressTick <= SHORT_OFF_TICKS 
                        && globalflags.lampOnGuard == false) {
                    globalflags.lampOn = false;
                    globalflags.pwmDirty = true;
                }
            } else {
                // button just pressed, turn the lamp on
                pressTick = ticks;
                if(globalflags.lampOn == false) {
                    globalflags.lampOn = true;
                    globalflags.lampOnGuard = true;
                }
                globalflags.pwmDirty = true;
            }
        }
        
        // ---------- synchronized to ticks ----------------
        if(globalflags.tickSync) {
            globalflags.tickSync = false;
            
            // guard time after short click turn on
            if(globalflags.lampOnGuard
                    && ticks - pressTick > ON_GUARD_TICKS) {
                globalflags.lampOnGuard = false;
            }

            // update brightness when button is kept pressed
            if(buttonsState & (1 << ButtonUp)) {
                // button kept pressed, and tick elapsed
                if(pwmDutyPeriod < MAX_PWM_PERIOD_IDX) {
                    pwmDutyPeriod++;
                    globalflags.pwmDirty = true;
                }
            }

            if(buttonsState & (1 << ButtonDown)) {
                // button kept pressed, and tick elapsed
                if(pwmDutyPeriod > 0) {
                    pwmDutyPeriod--;
                    globalflags.pwmDirty = true;
                }
            }
        }
        // ---------------------------------------------------------
        
        // update pwm
        if(globalflags.pwmDirty) {
            globalflags.pwmDirty = false;
            if(!globalflags.lampOn) {
                LedEn_SetLow();
                EPWM_LoadDutyValue(0);
            } else {
                EPWM_LoadDutyValue(expTable[pwmDutyPeriod]);
                LedEn_SetHigh();
            }
        }
    }
}

// increment ticks counter for button press time, and repeat synchronization
// approx 40Hz
void TMR2_CallBack(void) {
    ticks++;
    // easy way to synchronized parts that have to be executed only once
    // per tick
    globalflags.tickSync = true;
}
/**
 End of File
*/