Move avr simple serial driver.

[bertos.git] / cpu / avr / drv / ser_simple_avr.c

diff --git a/cpu/avr/drv/ser_simple_avr.c b/cpu/avr/drv/ser_simple_avr.c
new file mode 100644 (file)
index 0000000..7805892
--- /dev/null
+++ b/cpu/avr/drv/ser_simple_avr.c
@@ -0,0 +1,194 @@
+/**
+ * \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
+ *
+ * \version $Id$
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+/*#*
+ *#* $Log$
+ *#* Revision 1.2  2006/07/19 12:56:26  bernie
+ *#* Convert to new Doxygen style.
+ *#*
+ *#* Revision 1.1  2005/04/12 01:37:50  bernie
+ *#* Import into DevLib.
+ *#*
+ *#* Revision 1.7  2005/01/23 12:24:27  bernie
+ *#* Include macros.h for BV().
+ *#*
+ *#* Revision 1.6  2004/10/20 13:40:54  batt
+ *#* Put {} instead of ; after while loop.
+ *#*
+ *#* Revision 1.5  2004/10/20 13:39:40  batt
+ *#* Reformat.
+ *#*
+ *#* Revision 1.4  2004/10/20 13:30:02  batt
+ *#* Optimization of UCSR0C writing
+ *#*
+ *#* Revision 1.3  2004/10/14 15:55:32  batt
+ *#* Add ser_purge.
+ *#*
+ *#* Revision 1.2  2004/10/14 14:46:59  batt
+ *#* Change baudrate calculation.
+ *#*
+ *#* Revision 1.1  2004/10/13 16:35:36  batt
+ *#* New (simple) serial driver.
+ *#*/
+#include "ser_simple.h"
+
+#include <compiler.h>
+#include <config.h>
+#include <macros.h> /* BV() */
+#include <hw.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 = (((CLOCK_FREQ / 16UL) + (rate / 2)) / 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));
+}