/***** Project Header *****/
// Project Name:
// Author:
// Date: 21/10/2016  14:51
// Code auto-generated by systemdesignerjs
//      from www.techideas.co.nz

/***** Hardware defines *****/
//make sure this matches your oscillator setting
#define F_CPU 16000000//crystal

/***** Includes *****/
#include <avr/io.h>
//#include <stdint.h>
#include <util/delay.h>
//#include <avr/interrupt.h>
//#include <avr/eeprom.h>
//#include <stdio.h>
//#include <string.h>
//#include <avr/pgmspace.h>

/***** Hardware macros *****/
//Hardware macros for outputs
#define SET_FAN   PORTB |= (1<<PB2)
#define CLR_FAN   PORTB &= ~(1<<PB2)
#define SET_   PORTC |= (1<<PC5)
#define CLR_   PORTC &= ~(1<<PC5)
//Hardware macros for inputs
//Hardware macros for ADC inputs
#define TEMPR_SENSOR 5     //macro to refer to ADC channel

/***** User macros *****/

#define READING_INTERVAL 5000 //5 seconds
#define ON_TEMP 71
#define OFF_TEMP 55
/***** Declare & initialise global variables *****/


/***** Interrupt Service Routines *****/

/***** Prototypes for Functions *****/

uint8_t get_tempr(uint16_t adc_reading);
void control_fan(uint8_t tempr);

/***** Configure ADC *****/
void init_ADC() {
    //At 16MHZ set prescaler to 128 to get 125Khz clock
    ADCSRA |= ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0));
    //At 8MHz set prescaler to 64 to get 125Khz clock
    //ADCSRA |= ((1<<ADPS2)|(1<<ADPS1));
    //At 1MHz set prescaler to 8 to get 125Khz clock
    //ADCSRA |= ((1<<ADPS1)|(1<<ADPS0));
    //AVcc as voltage reference with external capacitor on ARef
    ADMUX |= (1<<REFS1);      //uncomment this line for internal voltage
    ADMUX |= (1 << REFS0);
    ADCSRA |= (1 << ADEN); //Power on the ADC
    ADCSRA |= (1 << ADSC); //Start initial conversion
}
// get a single adc reading from one channel
uint16_t read_adc(uint8_t channel) {
    ADMUX &= 0xF0; //Clear previously read channel
    ADMUX |= channel; //Set to new channel to read
    ADCSRA |= (1 << ADSC); //Starts a new conversion
    while (ADCSRA & (1 << ADSC)); //Wait until the conversion is done
    return ADCW; //Returns the value from the channel
}

/***** Main function *****/
int main(void) {
    /***** Initial hardware setups go here *****/
    init_ADC(); //setup the ADC to work

    /***** IO Hardware Config *****/
    // Initially make all micro pins outputs
    DDRB = 0xff; //set as outputs
    DDRC = 0xff; //set as outputs
    DDRD = 0xff; //set as outputs
    // make these pins inputs
    DDRC &= ~ (1 << PC5);
    DDRC &= ~ (1 << PC5);

    /***** Main variables go here *****/
    uint8_t tempr = 0;
    uint16_t tempr_sensor_val = 0;

    /***** Run once code goes here *****/
    /***** Loop code *****/
    while (1) {

        //DO NOT CHANGE THESE LINES OF CODE
        tempr_sensor_val = read_adc(5); // TEMPR_SENSOR_
        tempr = get_tempr(tempr_sensor_val);
        control_fan(tempr);
        _delay_ms(5000); // READING_INTERVAL_
    } //while end
} //main end
/***** Functions *****/
uint8_t get_tempr(uint16_t adc_reading) {
    uint32_t temporary = 11*26*100*adc_reading;
    uint8_t tempr = temporary>>18;
    return tempr;
}

void control_fan(uint8_t tempr) {
    if (tempr > 71) { // ON_TEMP_
        PORTB |= (1 << PB2); // SET_FAN_
    }
    if (tempr < 55) { // OFF_TEMP_
        PORTB &= ~ (1 << PB2); // CLR_FAN_
    }
}