#include <p18f4321.h>
#include <stdio.h>
#include <math.h>
#include <usart.h>
#pragma config OSC = INTIO2
#pragma config WDT=OFF
#pragma config LVP=OFF
#pragma config BOR =OFF
#define DP PORTCbits.RC4                                                           //sets rb2 to blue always


//float volt;
   char sevenseg[10] ={0x40, 0x79, 0x24, 0x30, 0x19, 0x12, 0x02, 0x78, 0x00, 0x18};  //seven segment A-G code

void init_UART()
{
   OpenUSART (USART_TX_INT_OFF & USART_RX_INT_OFF &
USART_ASYNCH_MODE & USART_EIGHT_BIT & USART_CONT_RX &
USART_BRGH_HIGH, 25);
   OSCCON = 0x60;
}
void putch(char c)                                                                  //makes it so the tera tree functions
{
while(!TRMT);
TXREG = c;}

void DO_INIT()                                                                      //step one
{
   ADCON0=0x01;                                                                    // select channel AN0, and turn on the ADC subsystem
   ADCON1=0x1B;                                                                    // select pins AN0 through AN3 as analog signal, VDD-VSS as
   ADCON2=0xA9;                                                                    // right justify the result. Set the bit conversion time (TAD) and
   TRISA = 0xFF;                                                                   //imports
   TRISB = 0x00;                                                                   //outport
   TRISC = 0x00;                                                                   //outputs
   TRISD = 0x00;                                                                   //outputs

}
unsigned int get_full_ADC(void)                                                    //step 2
{
int result;
   ADCON0bits.GO=1;                                                                // Start Conversion
   while(ADCON0bits.DONE==1);                                                      // wait for conversion to be completed
   result = (ADRESH * 0x100) + ADRESL;                                             // combine result of upper byte and
                                                                                   //lower byte into result
   return result;                                                                  // return the result.
}


void display_7seg (char H, char L)                                                //program seven segment
   {
   PORTD = sevenseg[H];                                                           //set portd to h
   int I = sevenseg[L];                                                           //insert interger i
   PORTC= I&0x0F;                                                                 //a-d go to portC
   PORTB= ((I&0x70)>>4);                                                          //e-g go to port B and shift right to be in correct position

}
void main()
{
   float volt;
   int V;
   DO_INIT();
   DP= 0;
   init_UART();
   int  H, L;                                                                     //set H and L for the two digits
   while(1){
   V = get_full_ADC()*4;
   volt = V/1000.0;
   //get_volt();                                                                    //runs temperature code
   H = (int)volt;                                                                   //give 10s place only
   L = (int)((volt-H)*10);                                                                   //give 1s place only
   display_7seg(L, H);                                                            //runs 7 seg display
   printf ("Volt= %2.2f V\r\n", volt );
   }                                              //print out temperature

}