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/*
* spreadspace avr utils
*
*
* Copyright (C) 2014-2016 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* spreadspace avr utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <stdio.h>
#include "serialio.h"
#ifdef USES_LUFA
#include "LUFA/Drivers/Peripheral/Serial.h"
#else
#define SERIAL_UBBRVAL(Baud) ((((F_CPU / 16) + (Baud / 2)) / (Baud)) - 1)
#define SERIAL_2X_UBBRVAL(Baud) ((((F_CPU / 8) + (Baud / 2)) / (Baud)) - 1)
static inline void Serial_Init(const uint32_t BaudRate, const uint8_t DoubleSpeed)
{
UBRR0 = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
UCSR0C = ((1 << UCSZ01) | (1 << UCSZ00));
UCSR0A = (DoubleSpeed ? (1 << U2X0) : 0);
UCSR0B = ((1 << TXEN0) | (1 << RXEN0));
DDRD |= (1 << 1);
PORTD |= (1 << 0);
}
static inline uint8_t Serial_IsSendReady(void)
{
return ((UCSR0A & (1 << UDRE0)) ? 1 : 0);
}
static inline void Serial_SendByte(const char DataByte)
{
while (!(Serial_IsSendReady()));
UDR0 = DataByte;
}
int Serial_putchar(char DataByte, FILE *Stream)
{
(void)Stream;
Serial_SendByte(DataByte);
return 0;
}
static inline uint8_t Serial_IsCharReceived(void)
{
return ((UCSR0A & (1 << RXC0)) ? 1 : 0);
}
static inline int16_t Serial_ReceiveByte(void)
{
if (!(Serial_IsCharReceived()))
return -1;
return UDR0;
}
int Serial_getchar(FILE *Stream)
{
(void)Stream;
if (!(Serial_IsCharReceived()))
return _FDEV_EOF;
return Serial_ReceiveByte();
}
void Serial_CreateStream(FILE* Stream)
{
*Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar, _FDEV_SETUP_RW);
}
#endif
static FILE serial_stream;
void serialio_init(const uint32_t baudrate, const uint8_t doublespeed)
{
Serial_Init(baudrate, doublespeed);
Serial_CreateStream(&serial_stream);
stdin = stdout = stderr = &serial_stream;
}
void serialio_task(void)
{
}
int16_t serialio_bytes_received(void)
{
return (int16_t)Serial_IsCharReceived();
}
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