pic16f876a-xc8-template.c

////////////////////////////////////////////////////////////////////////////////

// PIC16F876A Configuration Bit Settings

// 'C' source line config statements

#include <xc.h>

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

// CONFIG
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = OFF       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF         // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming enabled)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

////////////////////////////////////////////////////////////////////////////////

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


// crystal 20mhz capacitors 15pF
#define _XTAL_FREQ 20000000

//
void Delay1Second()
{
    int i;
    for(i=0;i<100;i++)
    {
         __delay_ms(10);
    }
}

char txt[10];



void usart_string(char *str)
{
  while(*str!='\0')
  {
      while(!PIR1bits.TXIF);
      TXREG=(*str);
      str++;
  }
}

/*
void interrupt ISR(void)
{
    //
    if (RCIE && RCIF) {
        char data=RCREG;
        return;
    }
}
*/


void usart_init(){
/*
UART>(4)
Waiting activity...
Calculated:     60606 bps
Estimated:      57600 bps
UART>
*/
    TRISC6 = 0; //TX pin set as output
    TRISC7 = 1; //RX pin set as input

     
    SPBRG=129;
    //TXSTA
    TXSTAbits.TX9=0;  //8 bit transmission
    TXSTAbits.TXEN=1; //Transmit enable
    TXSTAbits.SYNC=0; //Async mode
    TXSTAbits.BRGH=1; //High speed baud rate
    //RCSTA
    RCSTAbits.SPEN=1;   //Serial port enabled
    RCSTAbits.RX9=0;    //8 bit mode
    RCSTAbits.CREN=0;   //Enable receive
    RCSTAbits.ADDEN=0;  //Disable address detection
    //Receive interrupt
    //RCIE=1;
    //PEIE=1;
    //
    //ei();
}


void led_init(){
   TRISA0=0;
}
void led_state(int i){
    RA0=(i%2);
}

const char* txt2 = "teste\r\n";

int main(int argc, char** argv) {

    
    usart_init();

    led_init();

    int i=0;
    while(1) 
    {
       led_state(i);

       //
       sprintf(txt,"%d\r\n",i);

       //
       usart_string(txt2);

       //
       Delay1Second();
       //
       i++;
    }
    return (EXIT_SUCCESS);
}