PIC16F1579向け UARTで受信するテスト。RCREGbits.RCREGって書き方、完全に思いつかなかった

serialrx.c

// PIC16F1579 Configuration Bit Settings

// CONFIG1
#pragma config FOSC = INTOSC    // Oscillator Selection Bits (INTOSC oscillator; I/O function on CLKIN pin)
#pragma config WDTE = OFF       // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = ON       // Power-up Timer Enable (PWRT enabled)
#pragma config MCLRE = OFF      // MCLR Pin Function Select (MCLR/VPP pin function is digital input)
#pragma config CP = OFF         // Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config BOREN = ON       // Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF   // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)

// CONFIG2
#pragma config WRT = OFF        // Flash Memory Self-Write Protection (Write protection off)
#pragma config PPS1WAY = ON     // PPSLOCK bit One-Way Set Enable bit (PPSLOCKED Bit Can Be Cleared & Set Once)
#pragma config PLLEN = ON       // PLL Enable (4x PLL enabled)
#pragma config STVREN = ON      // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset)
#pragma config BORV = LO        // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LPBOREN = OFF    // Low Power Brown-out Reset enable bit (LPBOR is disabled)
#pragma config LVP = ON         // Low-Voltage Programming Enable (Low-voltage programming enabled)

#define _XTAL_FREQ 16000000

#include <xc.h>

void writeSerial(unsigned char write_char)
{
    while(!(PIR1bits.TXIF && TXSTAbits.TRMT));
    TXREG = write_char;
}

void delayms(int ms)
{
    for(int i = 0; i <= ms; i++) {
        __delay_ms(1);
    }
}

void main(void)
{
    OSCCON = 0b01111011; // 16MHz
    ANSELC = 0b00000000;
    TRISC = 0b00111111; // RC0 to RC5 input
    PORTC = 0b00000000;
    
    RA0PPS = 0b1001; // RA0 UART TX / RB5 RX
    TXSTA = 0b00100000; // 8bit UART
    RCSTA = 0b10010000;
    SPBRG = 25; // 16MHz 9600bps
    INTCONbits.GIE = 1; // accept interrupt
    PIE1bits.RCIE = 1; // accept RX interrupt

    ANSELB = 0b00000000;
    TRISBbits.TRISB5 = 1; //input for RX
    PORTCbits.RC5 = 0; //init for RX
    
    while(1) {
        if (PIR1bits.RCIF) {
            writeSerial(RCREGbits.RCREG);
        }
        while(!TXSTAbits.TRMT);
    }
    return;
}