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bertos/cpu/avr/drv/ser_simple_avr.c

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+#warning FIXME:This module is obsolete, yuo must refactor it.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