//v0 4/21/2014 by Everett, modified 01/05/2014 by Mattaus
//Modified for PIC10F322
//Simple flashlight controller. Mode change on power cycle. 3 modes, no strobe.

#include <htc.h>
#include <pic10f322.h>

#define _XTAL_FREQ 8000000
#define max_mode 2  //number of modes is 3 (0,1,2)
#define default_mode 0  //default mode is first mode
#define on_time 15  //milliseconds

__CONFIG(FOSC_INTOSC & WDTE_SWDTEN & PWRTE_ON & MCLRE_ON & CP_OFF & CPD_OFF & BOREN_ON & CLKOUTEN_OFF & IESO_OFF & FCMEN_OFF);
__CONFIG(WRT_BOOT & PLLEN_OFF & STVREN_ON & BORV_LO & LVP_OFF);

persistent unsigned char mode;  //must be declared persistent for ram retention trick to work
enum mode
{
    max=0,  //first mode is high
    med=1,  //second mode is med
    low=2,  //third mode is low
};

bit on_off;
persistent unsigned int key;

void delayms(int milliseconds);
void configure(void);

void interrupt isr(void)
{
    if(TMR1IF)
    {
        TMR1IF=0;
    }

    if(TMR0IF)                  //fires at 1kHz
    {
        TMR0IF=0;
        if(strobe_timer){strobe_timer--;}   //count down milliseconds
    }
}

void main(void)
{
    configure();                //set up hardware peripherals

    delayms(15);                //short delay to avoid power glitches incrementing mode

    if(key==12345)              //RAM retention trick to detect quick power cycles
    {
        mode++;             //go to next mode
        if(mode>max_mode){mode=0;}  //if on third mode, cycle back to first mode
    }
    else                    //long power loss. default to first mode
    {
        mode=default_mode;      //start in first mode
        key=12345;          //set key back so it can recognise power outage
    }


    switch(mode)                //initialize current mode
    {
        default:
        case max:
            CCPR1L=255;     //PWM output to 100%
            break;          //pause
        case med:
            CCPR1L=25;      //PWM out to 10%
            break;          //pause
        case low:
            CCPR1L=1;       //PWM out to 0.4%
            break;          //pause

    }


    GIE=1;                  //turn on interrupts

}

void delayms(int milliseconds)                  //I have no idea what this section does
{                               //
    while(milliseconds!=0){ __delay_ms(1); milliseconds--;} //
}                               //

void configure(void)
{
    INTCON=0b01100000;
    PIR1=0;
    PIR2=0;
    T1CON=0b00110001;
    T2CON=0b00000101;
    PR2=255;
    TMR2=0;

    LATA=0;
    TRISA=0b11111011;
    ANSELA=0b00000000;
    WPUA=0b11111011;
    APFCON=0;

    OSCCON=0b01110011;  //8MHz
    PIE1=0b00000000;
    PIE2=0;
    OPTION_REG=0b00000010;  //8 prescale for 1ms interrupts

//  FVRCON=0b11000001;  //Need to change this register for 2.048v to adc (currently set to 1.024v)
//  ADCON0=0b00001101;  //
//  ADCON1=0b00010000;  //1/8, left justify, vref from vdd

    CCPR1L=0;
    CCP1CON=0b00001100;
}


__EEPROM_DATA(0,0,0,0,0,0,0,0);         //Not sure what this stuff is for either
__EEPROM_DATA(0, 0, 0, 0, 0, 0, 0, 0);      //
__EEPROM_DATA(0, 0, 0, 0, 0, 0, 0, 0);      //
__EEPROM_DATA('1','8','2','2',' ','f','l','a'); //
__EEPROM_DATA('s','h','l','i','g','h','t',' '); //
__EEPROM_DATA('b','y',' ','E','v','e','r','e'); //
__EEPROM_DATA('t','t',' ','e','v','e','r','e'); //
__EEPROM_DATA('t','t','.','b','r','a','d','f'); //
__EEPROM_DATA('o','r','d','@','g','m','a','i'); //
__EEPROM_DATA('l','.','c','o','m',' ',' ',' '); //