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ioport.c
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ioport.c
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/**
* Copyright (C) 2018 Thomas R. Dial
* All Rights Reserved
*
* Routines for initializing and reading/writing serial I/O.
*/
#include "ioport.h"
#include <xc.h>
#include "config.h"
status_t ioport_init(unsigned long int baudrate) {
unsigned long int x = 0;
x = (_XTAL_FREQ - (baudrate * 64)) / (baudrate * 64);
if (x > 255) {
x = (_XTAL_FREQ - (baudrate * 16)) / (baudrate * 16);
BRGH = 1;
}
if (x < 256) {
SPBRG = x;
SYNC = 0; // Asynchronous mode (clear sync bit to zero.)
SPEN = 1; // Enable serial communication.
TRISC7 = 1; // Configure as RX pin (serial data receive)
TRISC6 = 1; // Configure as TX pin (serial data transmit)
CREN = 1; // Enable reception
TXEN = 1; // Enable transmission
return 0; // Return success
}
return E_IOPORT_INVALID_BAUDRATE; // Return failure
}
char ioport_data_ready() {
return RCIF;
}
char ioport_read() {
while (!RCIF);
return RCREG;
}