PIC16F1704 USART TX example (RX is not implemented)

pic16f1704_usart.c

#include "xc.h"
#include "config.h"

#define BUFSIZE 12 //Maximum size of received string

volatile unsigned char rx_data;
volatile unsigned char rx_index;
volatile unsigned char rx_buffer[BUFSIZE];

/**
 * Send a caracter with USART
 * @param c character to send
 */
void USART_putc(unsigned char c) {
    while(!TXSTAbits.TRMT);
    TXREG = c;
}

/**
 * Send a string with USART
 * @param s string to send
 */
void USART_puts(unsigned char* s) {
    while(*s) {
        USART_putc(*s);
        s++;
    }
}

/**
 * Interrupt serbice routine
 */
void interrupt isr() {

    // USART receive interrupt
    if(PIR1bits.RCIF) {
        rx_data = RC1REG;
        // handle received character here
        PIR1bits.RCIF = 0;  // clear RCIF
    }
}

/**
 * Initialize USART peripheral : async @ 9600
 */
void USART_Init() {

    // IO Configuration
    // TX
    TRISAbits.TRISA2 = 1;
    RA2PPSbits.RA2PPS = 0b10100;    // Set RA2 as TX pin with PPS peripheral
    // RX
    TRISCbits.TRISC5 = 1;
    PORTCbits.RC5 = 0;
    ANSELCbits.ANSC5 = 0;

    // Configure USART
    TXSTAbits.BRGH = 1;     // high baud rate mode
    TXSTAbits.TX9 = 0;      // 8 or 9 bits
    TX1STAbits.SYNC = 0;    // asynchronous mode
    TX1STAbits.TXEN = 1;    // enable transmitter

    // Enable USART
    RCSTAbits.SPEN = 1; // enable peripheral
    RCSTAbits.RX9 = 0;  // 8 or 9 bits
    RCSTAbits.CREN = 1; // enable continious receiving
    SPBRGL = 25;        // set baud rate to 9600

    // USART Interrupts
    PIR1bits.RCIF = 0;  // clear receive interrupt
    PIE1bits.RCIE = 1;  // enable USART receive interrupt
}

void main(void) {

    //4Mhz internal oscillator
    OSCCONbits.IRCF = 0b1101;

    /**
     * Interrupts
     */
    INTCONbits.GIE = 1;
    INTCONbits.PEIE = 1;

    USART_Init();

    while(1) {
        USART_puts("hello world!\n");
        __delay_ms(5000);
    }
}