src/rs232.c


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#include "rs232.h"
#include <xc.h>

void eusart_init(void)
{
    
    // set Async and 8 bits frame
    TXSTAbits.SYNC = 0;
    TXSTAbits.TX9 = 0;
    
    // 9600 baud prescaler
    RCSTAbits.SPEN = 1;
    SPBRG = 129;
    TXSTAbits.BRGH = 1;
    BAUDCONbits.BRG16 = 0;
    
    // set up TX / RX pins
    TRISC7 = 1;
    TRISC6 = 1;
    RCSTAbits.CREN = 1; // enable continuous reception
    TXSTAbits.TXEN = 1;
}

void putch(char c)
{
    
    while (!TXIF);
    TXREG = c;
}

char getch(void)
{
    
    while (!RCIF);
    return RCREG;
}

char getche(void)
{
    char c = getch();
    putch(c); // echo
    
    return c;
}