#include<16f877a.h> 

#use delay (clock=4000000)

#fuses HS,PUT,NOLVP,NOWDT,BROWNOUT,nowdt
#define LCD_ENABLE_PIN  PIN_D2
#define LCD_RS_PIN      PIN_D0
#define LCD_RW_PIN      PIN_D1
#define LCD_DATA0       PIN_D3
#define LCD_DATA1       PIN_D4
#define LCD_DATA2       PIN_D5
#define LCD_DATA3       PIN_D6
#include <LCD.c>

#ifndef TC_CLK
   #define TC_CLK              PIN_C6           //edit these pins as necessary
#endif

#ifndef TC_CS
   #define TC_CS               PIN_C5
#endif

#ifndef TC_DATA
   #define TC_DATA             PIN_C7
#endif


int16 thermocouple_error;         //a handy dandy global error flag to tell you if a thermocouple is connected or not

void init_TC(void){
   output_low(TC_CLK);
   output_low(TC_DATA);
   output_high(TC_CS);            //if we idle high, the chip keeps doing conversions. Change this if you like
}
void main ()
{
LCD_INIT();

printf(lcd_putc,"\f ***TERMOMETRO***\n      MAX6675  " );

}
int16 read_TC(void){              //It takes 200ms (ish) for the MAX6675 to perform a conversion
   int8 i;
   int16 data;

   output_low(TC_CS);            //stop any conversion processes
   delay_us(1);               //and give it some time to power up (not very much, admittedly)

   for (i=0;i<16;i++){
      output_high(TC_CLK);
      delay_us(1);
      output_low(TC_CLK);
      shift_left(&data,2,input(TC_DATA));      //reads in 2 bytes to data from the pin TC_DATA
   }

   thermocouple_error=bit_test(data,2);      //this is the thermocouple status bit

   output_high(TC_CS);
   return(data);
}

int16 sortout(int16 raw){
    return(0x0FFF & (raw>>3));      //returns only the bits converning temperature
}

float toFloat_TC(int16 tmp){
   return((float)tmp/4.0);      //adjusts data to floating point format, and accounts for the decimal point
}

float do_everything(void){
   init_TC();
   delay_us(200);               //200ms is a long time to be doing nothing. use a timer interrupt to avoid wasting time here
   return(toFloat_TC(sortout(read_TC())));
   
    printf(lcd_putc,"\f TEMPERATURA = %3.2f", do_everything() );
  delay_ms(100);
  
   
}