temp sensor - workshop

/*
 * File:   main.c
 * Author: dnymr
 *
 * Created on March 24, 2022, 5:47 PM
 */


// PIC16F883 Configuration Bit Settings

// 'C' source line config statements

// CONFIG1
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator: High-speed crystal/resonator on RA6/OSC2/CLKOUT and RA7/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 = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config MCLRE = ON       // RE3/MCLR pin function select bit (RE3/MCLR pin function is MCLR)
#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 = ON       // Brown Out Reset Selection bits (BOR enabled)
#pragma config IESO = ON        // Internal External Switchover bit (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON       // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)
#pragma config LVP = OFF         // Low Voltage Programming Enable bit (RB3/PGM pin has PGM function, low voltage programming enabled)

// CONFIG2
#pragma config BOR4V = BOR40V   // Brown-out Reset Selection bit (Brown-out Reset set to 4.0V)
#pragma config WRT = OFF        // Flash Program Memory Self Write Enable bits (Write protection off)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include <xc.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#define _XTAL_FREQ 8000000
#define F_CPU 8000000/64 // value to calculate baud rate

unsigned char LATA;
unsigned char LATB;
unsigned char LATC;

void ADC_Init (){
   ADCON0=0x41;
   ADCON1=0x80;
   ///ADRESH = 0; //Flush ADC output Register
  // ADRESL = 0; //Flush ADC output Register
}

uint16_t ADC_Read (uint8_t channel){
   ADCON0 &= 0x01000101; // Clear The Channel Selection Bits
   ADCON0 |= channel<<2;
   __delay_us(30);
   GO_nDONE = 1; //Initializes A/D Conversion
   while(ADCON0bits.GO_DONE); //Wait for A/D Conversion to complete
   return ((ADRESH<<8)+ADRESL); //Returns Result
}

void UART_Init(long baud_rate){
   float bps;
   TRISC=0b11000000;
   bps = (( (float) (F_CPU) / (float) baud_rate) - 1); // sets baud rate
   SPBRG=(int)bps; // store value for 9600 baud rate
   TXSTAbits.CSRC = 0; // Don't care for asynchronous mode
   TXSTAbits.TX9 = 0; // Selects 8-bit data transmission
   TXSTAbits.TXEN = 1; // Enable Data tranmission on RC6 pin
   TXSTAbits.SYNC = 0; // Selects Asynchronous Serial Communication Mode
   TXSTAbits.BRGH = 0; // Default Baud rate speed
   BAUDCTLbits.BRG16 = 0; // selects only 8 bit register for baud rate
   RCSTA = 0x90; // Enables UART Communication PORT
}


void UART_Write(char *tx_str){
    char ch;
    while(*tx_str != 0x00){
        ch = *tx_str;
          while(!TRMT);
     TXREG = ch;
        tx_str++;
    }
}

void displayDigit1 (unsigned int digit1){
    if (digit1==0){
            LATA=0b00000111;
            LATB=0b00000110;
            LATC=0b00001000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==1){
            LATA=0b00000100;
            LATB=0b00000010;
            LATC=0b00000000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==2){
            LATA=0b00000011;
            LATB=0b00001110;
            LATC=0b00000000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==3){
            LATA=0b00000110;
            LATB=0b00001110;
            LATC=0b00000000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==4){
            LATA=0b00000100;
            LATB=0b00001010;
            LATC=0b00001000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==5){
            LATA=0b00000110;
            LATB=0b00001100;
            LATC=0b00001000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==6){
            LATA=0b00000111;
            LATB=0b00001100;
            LATC=0b00001000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==7){
            LATA=0b00000100;
            LATB=0b00000110;
            LATC=0b00000000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==8){
            LATA=0b00000111;
            LATB=0b00001110;
            LATC=0b00001000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit1==9){
            LATA=0b00000110;
            LATB=0b00001110;
            LATC=0b00001000;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
}

void displayDigit2 (unsigned int digit2){
    if (digit2==0){
            LATA|=0b00110000;
            LATB|=0b00100001;
            LATC|=0b00110010;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==1){
            LATA|=0b00000000;
            LATB|=0b00000000;
            LATC|=0b00010010;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==2){
            LATA|=0b00110000;
            LATB|=0b00000000;
            LATC|=0b00110001;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==3){
            LATA|=0b00100000;
            LATB|=0b00000000;
            LATC|=0b00110011;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==4){
            LATA|=0b00000000;
            LATB|=0b00000001;
            LATC|=0b00010011;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==5){
            LATA|=0b00100000;
            LATB|=0b00000001;
            LATC|=0b00100011;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==6){
            LATA|=0b00110000;
            LATB|=0b00000001;
            LATC|=0b00100011;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==7){
            LATA|=0b00000000;
            LATB|=0b00000000;
            LATC|=0b00110010;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
         if (digit2==8){
            LATA|=0b00110000;
            LATB|=0b00000001;
            LATC|=0b00110011;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
        if (digit2==9){
            LATA|=0b00100000;
            LATB|=0b00000001;
            LATC|=0b00110011;
            PORTA=LATA;
            PORTB=LATB;
            PORTC=LATC;
        }
}


void displayTemperature (unsigned int temp){
    LATA=0x00;
    LATB=0x00;
    LATC=0x00;
    if (temp>=10){
     int digit1=temp/10;
     int digit2=temp%10;
     displayDigit1 (digit1);
     displayDigit2 (digit2);
    }
    if (temp>=0 && temp <10)
     displayDigit2 (temp);
}


void main(void) {
    TRISA=0x00;
    TRISB=0b00100000;
    TRISC=0b11000000;
    float temp_old, temp, voltage;
    //UART_Init(9600);
    ADC_Init();
    uint16_t temp_ADC=ADC_Read(13);
    voltage = temp_ADC * 0.0048828;
    temp_old = voltage / 0.01;
    displayTemperature((int)temp);
    while (1){
        temp_ADC=ADC_Read(13);
        voltage = temp_ADC * 0.0048828;
        temp = voltage / 0.01;
        if (abs(temp-temp_old)>=0.6){
            displayTemperature((int)temp);
            temp_old=temp;
        }
     }
     return;
 }