contiki/cpu/avr/dev/rs232.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
#include <stdio.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "contiki-conf.h"
#include "contiki.h"
#include "dev/slip.h"
#include "dev/rs232.h"
/*ATmega32 and smaller have UBRRH/UCSRC at the same I/O address.
*USART_UCSRC_SEL (bit7) selects writing to UBRHH(0) or UCSRC(1).
*It is OR'd in below so if not defined we can just set it to zero.
*/
#ifndef USART_UCSRC_SEL
#define USART_UCSRC_SEL 0x00
#endif
/* Currently only the STK500 platform uses a static RAM buffer for printfs.
* Others print a character at a time using the gcc string pointer.
* gcc may not strip the unused buffer, even though it is statically
* allocated in an unused routine.
*/
#ifdef RS232_CONF_PRINTF_BUFFER_LENGTH
#define RS232_PRINTF_BUFFER_LENGTH RS232_CONF_PRINTF_BUFFER_LENGTH
#else
#if CONTIKI_TARGET_STK500
#define RS232_PRINTF_BUFFER_LENGTH 64
#endif
#endif
/* TX interrupts would allow non-blocking output up to the size of some RAM buffer.
* Since a RAM buffer is not implemented tx interrupts are superfluous and unwanted
* because they block debug prints from within interrupt routines
*/
#ifdef RS232_CONF_TX_INTERRUPTS
#define RS232_TX_INTERRUPTS RS232_CONF_TX_INTERRUPTS
#else
#define RS232_TX_INTERRUPTS 0
#endif
/* Insert a carriage return after a line feed. This is the default. */
#ifndef ADD_CARRIAGE_RETURN_AFTER_NEWLINE
#define ADD_CARRIAGE_RETURN_AFTER_NEWLINE 1
#endif
/* Reducing NUMPORTS from the default will harmlessly disable usage of those ports */
/* Two ports take 400 bytes flash and 4 bytes RAM. */
#ifdef RS232_CONF_NUMPORTS
#define NUMPORTS RS232_CONF_NUMPORTS
#endif
#if defined (__AVR_ATmega128__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega128RFA1__) || defined(__AVR_ATmega128RFR2__) || defined(__AVR_ATmega256RFR2__)
#ifndef NUMPORTS
#define NUMPORTS 2
#elif NUMPORTS > 2
#error Only two serial ports are defined for this processor!
#endif
#if NUMPORTS > 0
#define D_UDR0 UDR0
#define D_UDRE0M (1 << UDRE0)
#define D_UBRR0H UBRR0H
#define D_UBRR0L UBRR0L
#define D_UCSR0A UCSR0A
#define D_UCSR0B UCSR0B
#define D_UCSR0C UCSR0C
#define D_USART0_RX_vect USART0_RX_vect
#define D_USART0_TX_vect USART0_TX_vect
#if NUMPORTS > 1
#define D_UDR1 UDR1
#define D_UDRE1M (1 << UDRE1)
#define D_UBRR1H UBRR1H
#define D_UBRR1L UBRR1L
#define D_UCSR1A UCSR1A
#define D_UCSR1B UCSR1B
#define D_UCSR1C UCSR1C
#define D_USART1_RX_vect USART1_RX_vect
#define D_USART1_TX_vect USART1_TX_vect
#endif
#endif
#elif defined (__AVR_AT90USB1287__)
/* Has only UART1, map it to port 0 */
#ifndef NUMPORTS
#define NUMPORTS 1
#elif NUMPORTS > 1
#error Only one serial port is defined for this processor!
#endif
#if NUMPORTS > 0
#define D_UDR0 UDR1
#define D_UDRE0M (1 << UDRE1)
#define D_UBRR0H UBRR1H
#define D_UBRR0L UBRR1L
#define D_UCSR0A UCSR1A
#define D_UCSR0B UCSR1B
#define D_UCSR0C UCSR1C
#define D_USART0_RX_vect USART1_RX_vect
#define D_USART0_TX_vect USART1_TX_vect
#endif
#elif defined (__AVR_ATmega8515__)
#ifndef NUMPORTS
#define NUMPORTS 1
#elif NUMPORTS > 1
#error Only one serial port is defined for this processor!
#endif
#if NUMPORTS > 0
#define D_UDR0 UDR
#define D_UDRE0M (1 << UDRE)
#define D_UBRR0H UBRRH
#define D_UBRR0L UBRRL
#define D_UCSR0A UCSRA
#define D_UCSR0B UCSRB
#define D_UCSR0C UCSRC
#define D_USART0_RX_vect USART_RX_vect
#define D_USART0_TX_vect USART_TX_vect
#endif
#elif defined (__AVR_ATmega328P__)
#ifndef NUMPORTS
#define NUMPORTS 1
#elif NUMPORTS > 1
#error Only one serial port is defined for this processor!
#endif
#if NUMPORTS > 0
#define D_UDR0 UDR0
#define D_UDRE0M (1 << UDRE0)
#define D_UBRR0H UBRR0H
#define D_UBRR0L UBRR0L
#define D_UCSR0A UCSR0A
#define D_UCSR0B UCSR0B
#define D_UCSR0C UCSR0C
#define D_USART0_RX_vect USART_RX_vect
#define D_USART0_TX_vect USART_TX_vect
#endif
#elif defined (__AVR_ATmega8__) || defined (__AVR_ATmega16__) || defined (__AVR_ATmega32__)
#ifndef NUMPORTS
#define NUMPORTS 1
#elif NUMPORTS > 1
#error Only one serial port is defined for this processor!
#endif
#if NUMPORTS > 0
#define D_UDR0 UDR
#define D_UDRE0M (1 << UDRE)
#define D_UBRR0H UBRRH
#define D_UBRR0L UBRRL
#define D_UCSR0A UCSRA
#define D_UCSR0B UCSRB
#define D_UCSR0C UCSRC
#define D_USART0_RX_vect USART_RXC_vect
#define D_USART0_TX_vect USART_TXC_vect
#endif
#elif defined (__AVR_ATmega644__)
#ifndef NUMPORTS
#define NUMPORTS 1
#elif NUMPORTS > 1
#error Only one serial port is defined for this processor!
#endif
#if NUMPORTS > 0
#define D_UDR0 UDR0
#define D_UDRE0M (1 << UDRE0)
#define D_UBRR0H UBRR0H
#define D_UBRR0L UBRR0L
#define D_UCSR0A UCSR0A
#define D_UCSR0B UCSR0B
#define D_UCSR0C UCSR0C
#define D_USART0_RX_vect USART0_RX_vect
#define D_USART0_TX_vect USART0_TX_vect
#endif
#else
#error Please define the UART registers for your MCU!
#endif
#if NUMPORTS > 0
int (* input_handler_0)(unsigned char);
ISR(D_USART0_RX_vect)
{
unsigned char c;
c = D_UDR0;
if (input_handler_0 != NULL) input_handler_0(c);
}
#if RS232_TX_INTERRUPTS
volatile uint8_t txwait_0;
ISR(D_USART0_TX_vect)
{
txwait_0 = 0;
}
#endif
#if NUMPORTS > 1
int (* input_handler_1)(unsigned char);
ISR(D_USART1_RX_vect)
{
unsigned char c;
c = D_UDR1;
if (input_handler_1 != NULL) input_handler_1(c);
}
#if RS232_TX_INTERRUPTS
volatile uint8_t txwait_1;
ISR(USART1_TX_vect)
{
txwait_1 = 0;
}
#endif
#if NUMPORTS > 2
int (* input_handler_2)(unsigned char);
ISR(D_USART2_RX_vect)
{
unsigned char c;
c = D_UDR2;
if (input_handler_2 != NULL) input_handler_2(c);
}
#if RS232_TX_INTERRUPTS
volatile uint8_t txwait_2;
ISR(USART2_TX_vect)
{
txwait_2= 0;
}
#endif
#endif
#endif
#endif
/*---------------------------------------------------------------------------*/
void
rs232_init (uint8_t port, uint8_t bd, uint8_t ffmt)
{
#if NUMPORTS > 0
if (port == 0) {
D_UBRR0H = (uint8_t)(bd>>8);
D_UBRR0L = (uint8_t)bd;
#if RS232_TX_INTERRUPTS
txwait_0 = 0;
D_UCSR0B = USART_INTERRUPT_RX_COMPLETE | USART_INTERRUPT_TX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
#else
D_UCSR0B = USART_INTERRUPT_RX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
#endif
D_UCSR0C = USART_UCSRC_SEL | ffmt;
input_handler_0 = NULL;
#if NUMPORTS > 1
} else if (port == 1) {
D_UBRR1H = (uint8_t)(bd>>8);
D_UBRR1L = (uint8_t)bd;
#if RS232_TX_INTERRUPTS
txwait_1 = 0;
D_UCSR1B = USART_INTERRUPT_RX_COMPLETE | USART_INTERRUPT_TX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
#else
D_UCSR1B = USART_INTERRUPT_RX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
#endif
D_UCSR1C = USART_UCSRC_SEL | ffmt;
input_handler_1 = NULL;
#if NUMPORTS > 2
} else if (port == 2) {
D_UBRR2H = (uint8_t)(bd>>8);
D_UBRR2L = (uint8_t)bd;
#if RS232_TX_INTERRUPTS
txwait_2 = 0;
D_UCSR2B = USART_INTERRUPT_RX_COMPLETE | USART_INTERRUPT_TX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
#else
D_UCSR2B = USART_INTERRUPT_RX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
#endif
D_UCSR2C = USART_UCSRC_SEL | ffmt;
input_handler_2 = NULL;
#endif
#endif
}
#endif /* NUMPORTS > 0 */
}
/*---------------------------------------------------------------------------*/
void
rs232_send(uint8_t port, unsigned char c)
{
#if RS232_TX_INTERRUPTS
/* Output character and block until it is transmitted */
#if NUMPORTS > 0
if (port == 0 ) {
txwait_0 = 1;
D_UDR0 = c;
while (txwait_0);
#if NUMPORTS > 1
} else if (port == 1) {
txwait_1 = 1;
D_UDR1 = c;
while (txwait_1);
#if NUMPORTS > 2
} else if (port == 2) {
txwait_2 = 1;
D_UDR2 = c;
while (txwait_2);
#endif
#endif
}
#endif
#else /* RS232_TX_INTERRUPTS */
/* Block until tx ready and output character */
#if NUMPORTS > 0
if (port == 0 ) {
while (!(D_UCSR0A & D_UDRE0M));
D_UDR0 = c;
#if NUMPORTS > 1
} else if (port == 1) {
while (!(D_UCSR1A & D_UDRE1M));
D_UDR1 = c;
#if NUMPORTS > 2
} else if (port == 2) {
while (!(D_UCSR2A & D_UDRE2M));
D_UDR2 = c;
#endif
#endif
}
#endif
#endif /* RS232_TX_INTERRUPTS */
}
/*---------------------------------------------------------------------------*/
void
rs232_set_input(uint8_t port, int (*f)(unsigned char))
{
#if NUMPORTS > 0
if (port == 0) {
input_handler_0 = f;
#if NUMPORTS > 1
} else if (port == 1) {
input_handler_1 = f;
#if NUMPORTS > 2
} else if (port == 2) {
input_handler_2 = f;
#endif
#endif
}
#endif
}
/*---------------------------------------------------------------------------*/
void
rs232_print(uint8_t port, char *buf)
{
while(*buf) {
#if ADD_CARRIAGE_RETURN_AFTER_NEWLINE
if(*buf=='\n') rs232_send(port, '\r');
if(*buf=='\r') buf++; else rs232_send(port, *buf++);
#else
rs232_send(port, *buf++);
#endif
}
}
#if RS232_PRINTF_BUFFER_LENGTH
/*---------------------------------------------------------------------------*/
void
rs232_printf(uint8_t port, const char *fmt, ...)
{
va_list ap;
static char buf[RS232_PRINTF_BUFFER_LENGTH];
va_start (ap, fmt);
vsnprintf (buf, RS232_PRINTF_BUFFER_LENGTH, fmt, ap);
va_end(ap);
rs232_print (port, buf);
}
#endif
/*---------------------------------------------------------------------------*/
void
slip_arch_writeb(unsigned char c)
{
rs232_send(SLIP_PORT, c);
}
/*---------------------------------------------------------------------------*/
int rs232_stdout_putchar(char c, FILE *stream);
static uint8_t stdout_rs232_port=RS232_PORT_0;
static FILE rs232_stdout = FDEV_SETUP_STREAM(rs232_stdout_putchar,
NULL,
_FDEV_SETUP_WRITE);
int rs232_stdout_putchar(char c, FILE *stream)
{
#if ADD_CARRIAGE_RETURN_AFTER_NEWLINE
if(c=='\n') rs232_send(stdout_rs232_port, '\r');
if(c!='\r') rs232_send (stdout_rs232_port, c);
#else
rs232_send (stdout_rs232_port, c);
#endif
return 0;
}
/*---------------------------------------------------------------------------*/
void rs232_redirect_stdout (uint8_t port) {
stdout_rs232_port = port;
stdout = &rs232_stdout;
}