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#include <htc.h>            //include hitech C header file
#include "lcd.h"
#include <stdlib.h>
#include <stdio.h>

#define    _XTAL_FREQ            4000000

// This configuration bits are for PIC16F690 using internal crystal

//__CONFIG(FCMEN_ON & IESO_OFF & BOREN_OFF & CPD_OFF & CP_OFF & MCLRE_OFF & PWRTE_ON & WDTE_OFF & FOSC_INTRCIO);
#pragma config FOSC = INTRCIO  // Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA4/OSC2/CLKOUT pin, I/O function on RA5/OSC1/CLKIN)
#pragma config WDTE = OFF      // Watchdog Timer Enable bit (WDT disabled and can be enabled by SWDTEN bit of the WDTCON register)
#pragma config PWRTE = ON      // Power-up Timer Enable bit (PWRT enabled)
#pragma config MCLRE = OFF      // MCLR Pin Function Select bit (MCLR pin function is digital input, MCLR internally tied to VDD)
#pragma config CP = OFF        // Code Protection bit (Program memory code protection is disabled)
#pragma config CPD = OFF        // Data Code Protection bit (Data memory code protection is disabled)
#pragma config BOREN = OFF      // Brown-out Reset Selection bits (BOR disabled)
#pragma config IESO = OFF      // Internal External Switchover bit (Internal External Switchover mode is disabled)
#pragma config FCMEN = ON      // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)


#define SCS_BIT                0x01
#define INT_OSC_8MHZ         (0b01110000 | SCS_BIT)
#define INT_OSC_4MHZ         (0b01100000 | SCS_BIT)
#define INT_OSC_2MHZ         (0b01010000 | SCS_BIT)
#define INT_OSC_1MHZ         (0b01000000 | SCS_BIT)
#define INT_OSC_500KHZ         (0b00110000 | SCS_BIT)
#define INT_OSC_250KHZ         (0b00100000 | SCS_BIT)
#define INT_OSC_125KHZ         (0b00010000 | SCS_BIT)
#define INT_OSC_31KHZ         (0b00000000 | SCS_BIT)

#define Skip_ROM             0xCC
#define Convert_T             0x44
#define Read_scratchpad     0xBE

#define Port_18B20             RA2
#define Tx_18B20             TRISA2 = 0
#define Rx_18B20             TRISA2 = 1

#define WAIT1                1000
#define WAIT2                500

#define DS18B20_CONV_TIME    750
#define DS18B20_RESET_PULSE 480
#define DS18B20_WAIT_TIME     60
#define DS18B20_PULLUP_TIME 2

#define ONEWIRE_PRESENT     0
#define ONEWIRE_ABSENT         1

unsigned char TLow;
unsigned char vDisp[9];
unsigned char DP;


void init (void)
{
    ANSEL = 0;        //Initialize A/D ports off
    ANSELH = 0;        //Initialize A/D ports off
    CM1CON0 = 0;    //Initialize comp 1 off
    CM2CON0 = 0;    //Initialize comp 2 off
    PORTA = 0x00;    // Clears PORTA
    PORTB = 0x00;    // Clears PORTB
    PORTC = 0x00;    // Clears PORTC
    TRISA = 0x00;    // Sets PORTA to all output
    TRISB = 0x00;    // Sets PORTB to all output
    TRISC = 0x00;    // sets PORTC to all output.
    //TRISA1=1;

    // We want 8MHz
    OSCCON = INT_OSC_8MHZ;

    // Wait for clock to stabilise.
    __delay_ms(10);
}



unsigned char reset()
{
    Tx_18B20;                            // Tris = 0 (output)
    Port_18B20 = 0;                        // set pin# to low (0)
    __delay_us(DS18B20_RESET_PULSE);    // 1 wire require time delay
    Rx_18B20;                            // Tris = 1 (input)
    __delay_us(DS18B20_WAIT_TIME);        // 1 wire require time delay

    if (Port_18B20 == 1)                 // if there is a presence pluse
    {
        __delay_us(DS18B20_RESET_PULSE);// Reset and return
        return ONEWIRE_PRESENT;            // return 0 ( 1-wire is presence)
    }

    __delay_us(DS18B20_RESET_PULSE);    // Reset and return
    return ONEWIRE_ABSENT;                // return 1 ( 1-wire is NOT presence)
}

void write(char WRT)
{
    char i,Cmd;
    Cmd = WRT;
    Rx_18B20; // set pin# to input (1)
    for(i = 0; i < 8; i++)
    {
        if((Cmd & (1<<i))!= 0)
        {
            // write 1
            Tx_18B20; // set pin# to output (0)
            Port_18B20 = 0; // set pin# to low (0)
            __delay_us(DS18B20_PULLUP_TIME); // 1 wire require time delay
            Rx_18B20; // set pin# to input (release the bus)
            __delay_us(DS18B20_WAIT_TIME); // 1 wire require time delay
        } else  {
            //write 0
            Tx_18B20; // set pin# to output (0)
            Port_18B20 = 0; // set pin# to low (0)
            __delay_us(DS18B20_WAIT_TIME); // 1 wire require time delay
            Rx_18B20; // set pin# to input (release the bus)
        }
    }
}

unsigned char readH()
{
    char i,result = 0;
    Rx_18B20; // TRIS is input(1)
    for(i = 8; i > 0; i--)
    {
        Tx_18B20; // TRIS is output(0)
        Port_18B20 = 0; // genarate low pluse for 2us
        __delay_us(DS18B20_PULLUP_TIME);
        Rx_18B20; // TRIS is input(1) release the bus
        if(Port_18B20 != 0) {
            result |= 1<<i;//i
        }
        __delay_us(DS18B20_WAIT_TIME); // wait for recovery time
    }
    return result;
}
unsigned char readL()
{
    char i,result = 0;
    Rx_18B20; // TRIS is input(1)
    for(i = 0; i < 8; i++)
    {
        Tx_18B20; // TRIS is output(0)
        Port_18B20 = 0; // genarate low pluse for 2us
        __delay_us(DS18B20_PULLUP_TIME);
        Rx_18B20; // TRIS is input(1) release the bus
        if(Port_18B20 != 0) {
            result |= 1<<i;//i
        }
        __delay_us(DS18B20_WAIT_TIME); // wait for recovery time
    }
    return result;
}

/*******************************************************************************
* MAIN FUNCTION                                                                *
*******************************************************************************/
int main(void)
{
   
    unsigned short tempL, tempH; //, fraction;
   
        init();
    lcd_init();
    __delay_ms(500);
    lcd_goto(0x00);
    lcd_puts("Try again");
    __delay_ms(2000);
    lcd_clear();
    vDisp[4] = '.';
    vDisp[6] = " ";
    vDisp[7] = "´";
    vDisp[8] = 'C';
    lcd_goto(0x00);
    lcd_puts("Temp:");

    while(1)     // create an infinite loop
    {       
        if (!reset() == ONEWIRE_PRESENT)
        {
         
            write(Skip_ROM);
            write(Convert_T);       
            __delay_ms(DS18B20_CONV_TIME);
           
            reset();
            write(Skip_ROM);       
            write(Read_scratchpad);   
           
            tempL = readL();            //read low temp value
         
            tempH = readH();            //read high temp value
         
          DP = tempL & 0x01; // 'Check if Temperature is integer or fractional
        if (tempH){ //If reading is negative
            vDisp[0] = '-';
            tempL = ((~tempL) + 1) >> 1;
        }
        else{
            vDisp[0] = '+';
            tempL = tempL >> 1; // 'Shift one position right (divide by 2) to get integer reading and get rid of decimal point
        }
        vDisp[1] = (tempL / 100) + 48; // 'Get hundreds and convert to ASCII
        vDisp[2] = ((tempL / 10) % 10) + 48; // 'Get tens and convert to ASCII
        vDisp[3] = (tempL % 10) + 48; // 'Get units and convert to ASCII
        if (DP){ // 'If reading is fractional, ie has 0.5 at end
            vDisp[5] = '5';
        }
        else{ // 'If reading is a whole number
            vDisp[5] = '0';
        }
        lcd_goto(0x08);
        lcd_putch(vDisp[0]);
        lcd_putch(vDisp[1]);
        lcd_putch(vDisp[2]);
        lcd_putch(vDisp[3]);
        lcd_putch(vDisp[4]);
        lcd_putch(vDisp[5]);
        lcd_putch(vDisp[6]);
        lcd_putch(vDisp[7]);
        lcd_putch(vDisp[8]);
        lcd_goto(0x40);
       
           
       
       
           
           

       
        }
    }

   
}