172 lines
3.7 KiB
C
172 lines
3.7 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2004, 2005 Develer S.r.l. (http://www.develer.com/)
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* All Rights Reserved.
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* -->
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*
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* \brief Simple serial I/O driver
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*
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* \author Francesco Sacchi <batt@develer.com>
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*/
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#warning FIXME:This module is obsolete, yuo must refactor it.
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#if 0
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#include "ser_simple_avr.h"
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#include <cfg/compiler.h>
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#include <appconfig.h>
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#include <cfg/macros.h> /* BV() */
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#include <hw/hw_cpufreq.h>
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#include <avr/io.h>
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/**
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* Send a character over the serial line.
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*
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* \return the character sent.
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*/
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int _ser_putchar(int c)
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{
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/* Disable Rx to avoid echo*/
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UCSR0B &= ~BV(RXEN);
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/* Enable tx*/
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UCSR0B |= BV(TXEN);
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/* Prepare transmission */
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UDR0 = c;
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/* Wait until byte sent */
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while (!(UCSR0A & BV(TXC))) {}
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/* Disable tx to avoid short circuit when tx and rx share the same wire. */
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UCSR0B &= ~BV(TXEN);
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/* Enable Rx */
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UCSR0B |= BV(RXEN);
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/* Delete TRANSMIT_COMPLETE_BIT flag */
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UCSR0A |= BV(TXC);
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return c;
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}
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/**
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* Get a character from the serial line.
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* If ther is no character in the buffer this function wait until
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* one is received (no timeout).
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*
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* \return the character received.
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*/
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int _ser_getchar(void)
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{
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/* Wait for data */
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while (!(UCSR0A & BV(RXC))) {}
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return UDR0;
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}
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/**
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* Get a character from the receiver buffer
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* If the buffer is empty, ser_getchar_nowait() returns
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* immediatly EOF.
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*/
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int _ser_getchar_nowait(void)
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{
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if (!(UCSR0A & BV(RXC))) return EOF;
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else return UDR0;
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}
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void _ser_settimeouts(void)
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{
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}
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/**
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* Set the baudrate.
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*/
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void _ser_setbaudrate(unsigned long rate)
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{
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/* Compute baud-rate period */
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uint16_t period = DIV_ROUND(CPU_FREQ / 16UL, rate) - 1;
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UBRR0H = (period) >> 8;
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UBRR0L = (period);
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}
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/**
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* Send a string.
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*/
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int _ser_print(const char *s)
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{
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while(*s) _ser_putchar(*s++);
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return 0;
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}
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void _ser_setparity(int parity)
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{
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/* Set the new parity */
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UCSR0C |= (UCSR0C & ~(BV(UPM1) | BV(UPM0))) | (parity << UPM0);
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}
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/**
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* Dummy functions.
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*/
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void _ser_purge(void)
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{
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while (_ser_getchar_nowait() != EOF) {}
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}
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/**
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* Initialize serial.
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*/
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struct Serial * _ser_open(void)
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{
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/*
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* Set Rx and Tx pins as input to avoid short
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* circuit when serial is disabled.
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*/
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DDRE &= ~(BV(PE0)|BV(PE1));
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PORTE &= ~BV(PE0);
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PORTE |= BV(PE1);
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/* Enable only Rx section */
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UCSR0B = BV(RXEN);
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return NULL;
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}
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/**
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* Clean up serial port, disabling the associated hardware.
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*/
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void _ser_close(void)
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{
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/* Disable Rx & Tx. */
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UCSR0B &= ~(BV(RXEN) | BV(TXEN));
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}
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#endif
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