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- Fix/enhence support for RS232 interface on AVR (ATMega128):

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* support for multiple ports: (extended interface with 'port' parameter)
 * new function: rs232_redirect_stdout that allows you to redirect stdout
   to a serial port
- In order to implement support for other MCUs, adopt a copy of
   rs232_atmega128.h
This commit is contained in:
barner 2006-12-22 17:00:45 +00:00
parent 86f37e7c1b
commit 45cbcde797
3 changed files with 319 additions and 51 deletions
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173
cpu/avr/dev/rs232.c
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@ -28,103 +28,190 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: rs232.c,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $
* @(#)$Id: rs232.c,v 1.2 2006/12/22 17:00:45 barner Exp $
*/
#include <stdio.h>
#include <avr/io.h>
#include <avr/signal.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "contiki-conf.h"
#include "contiki.h"
#include "dev/slip.h"
#include "dev/serial.h"
#include "dev/rs232.h"
static volatile unsigned char txwait;
/*static unsigned char slipmode;*/
#ifdef RS232_CONF_PRINTF_BUFFER_LENGTH
#define RS232_PRINTF_BUFFER_LENGTH RS232_CONF_PRINTF_BUFFER_LENGTH
#else
#define RS232_PRINTF_BUFFER_LENGTH 64
#endif
static int (* input_handler)(unsigned char) = NULL;
#if MCU == atmega128
typedef struct {
volatile uint8_t * UDR;
volatile uint8_t * UBRRH;
volatile uint8_t * UBRRL;
volatile uint8_t * UCSRB;
volatile uint8_t * UCSRC;
volatile uint8_t txwait;
int (* input_handler)(unsigned char);
} rs232_t;
static rs232_t rs232_ports[2] = {
{ // UART0
&UDR0,
&UBRR0H,
&UBRR0L,
&UCSR0B,
&UCSR0C,
0,
NULL
},
{ // UART1
&UDR1,
&UBRR1H,
&UBRR1L,
&UCSR1B,
&UCSR1C,
0,
NULL
}
};
#else
#error Please define the UART registers for your MCU!
#endif
/*---------------------------------------------------------------------------*/
SIGNAL(SIG_UART0_TRANS)
{
txwait = 0;
rs232_ports[RS232_PORT_0].txwait = 0;
}
/*---------------------------------------------------------------------------*/
SIGNAL(SIG_UART0_RECV)
{
unsigned char c;
c = UDR0;
c = *(rs232_ports[RS232_PORT_0].UDR);
if(input_handler != NULL) {
input_handler(c);
if(rs232_ports[RS232_PORT_0].input_handler != NULL) {
rs232_ports[RS232_PORT_0].input_handler(c);
}
/* if(slipmode) {
slip_input_byte(c);
} else {
serial_input_byte(c);
}*/
}
/*---------------------------------------------------------------------------*/
SIGNAL(SIG_UART1_TRANS)
{
rs232_ports[RS232_PORT_1].txwait = 0;
}
/*---------------------------------------------------------------------------*/
SIGNAL(SIG_UART1_RECV)
{
unsigned char c;
c = *(rs232_ports[RS232_PORT_1].UDR);
if(rs232_ports[RS232_PORT_1].input_handler != NULL) {
rs232_ports[RS232_PORT_1].input_handler(c);
}
}
/*---------------------------------------------------------------------------*/
void
rs232_init(void)
rs232_init (uint8_t port, uint8_t bd, uint8_t ffmt)
{
/* Enable transmit. */
UCSR0B = _BV(RXCIE) | _BV(TXCIE) | _BV(RXEN) | _BV(TXEN);
/* Set baud rate (23 =~ 38400) */
UBRR0H = 0;
UBRR0L = 23;
*(rs232_ports[port].UBRRH) = (uint8_t)(bd>>8);
*(rs232_ports[port].UBRRL) = (uint8_t)bd;
/* slipmode = 0;*/
txwait = 0;
/*
* - Enable receiver and transmitter,
* - Enable interrupts for receiver and transmitter
*/
*(rs232_ports[port].UCSRB) = USART_INTERRUPT_RX_COMPLETE | USART_INTERRUPT_TX_COMPLETE | \
USART_RECEIVER_ENABLE | USART_TRANSMITTER_ENABLE;
input_handler = NULL;
/*
* - mode (sync. / async)
* - Parity
* - Stop bits
* - charater size (9 bits are currently not supported)
* - clock polarity
*/
*(rs232_ports[port].UCSRC) = ffmt;
rs232_ports[port].txwait = 0;
rs232_ports[port].input_handler = NULL;
}
/*---------------------------------------------------------------------------*/
/*void
rs232_init_slip(void)
{
rs232_init();
slipmode = 1;
}*/
/*---------------------------------------------------------------------------*/
void
rs232_print_p(prog_char *buf)
rs232_print_p(uint8_t port, prog_char *buf)
{
while(pgm_read_byte(buf)) {
rs232_send(pgm_read_byte(buf));
rs232_send(port, pgm_read_byte(buf));
++buf;
}
}
/*---------------------------------------------------------------------------*/
void
rs232_print(char *buf)
rs232_print(uint8_t port, char *buf)
{
while(*buf) {
rs232_send(*buf++);
rs232_send(port, *buf++);
}
}
/*---------------------------------------------------------------------------*/
void
rs232_send(unsigned char c)
rs232_printf(uint8_t port, const char *fmt, ...)
{
txwait = 1;
UDR0 = c;
while(txwait);
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);
}
/*---------------------------------------------------------------------------*/
void
rs232_set_input(int (*f)(unsigned char))
rs232_send(uint8_t port, unsigned char c)
{
input_handler = f;
rs232_ports[port].txwait = 1;
*(rs232_ports[port].UDR) = c;
while(rs232_ports[port].txwait);
}
/*---------------------------------------------------------------------------*/
void
rs232_set_input(uint8_t port, int (*f)(unsigned char))
{
rs232_ports[port].input_handler = f;
}
/*---------------------------------------------------------------------------*/
void
slip_arch_writeb(unsigned char c)
{
rs232_send(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)
{
rs232_send (stdout_rs232_port, c);
return 0;
}
/*---------------------------------------------------------------------------*/
void rs232_redirect_stdout (uint8_t port) {
stdout_rs232_port = port;
stdout = &rs232_stdout;
}

70
cpu/avr/dev/rs232.h
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@ -28,24 +28,41 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: rs232.h,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $
* Author: Adam Dunkels <adam@sics.se>
* Simon Barner <barner@in.tum.de>
*
* @(#)$Id: rs232.h,v 1.2 2006/12/22 17:00:45 barner Exp $
*/
#ifndef __RS232_H__
#define __RS232_H__
#include <avr/pgmspace.h>
#include "contiki-conf.h"
#if MCU == atmega128
#include "dev/rs232_atmega128.h"
#else
#error "Please implement a rs232 header for your MCU (or set the MCU type \
in contiki-conf.h)."
#endif
/**
* \brief Initialize the RS232 module
*
* This function is called from the boot up code to
* initalize the RS232 module.
* \param port The RS232 port to be used.
* \param bd The baud rate of the connection.
* \param ffmt The frame format of the connection, i.e. parity mode,
* number of stop and data bits, ...
*/
void rs232_init(void);
void
rs232_init (uint8_t port, uint8_t bd, uint8_t ffmt);
/**
* \brief Set an input handler for incoming RS232 data
* \param port The RS232 port to be used.
* \param f A pointer to a byte input handler
*
* This function sets the input handler for incoming RS232
@ -61,23 +78,26 @@ void rs232_init(void);
* take place. If the input handler returns zero, the CPU
* is kept sleeping.
*/
void rs232_set_input(int (* f)(unsigned char));
void
rs232_set_input(uint8_t port, int (* f)(unsigned char));
/**
* \brief Print a text string from program memory on RS232
* \param str A pointer to the string that is to be printed
* \param port The RS232 port to be used.
* \param buf A pointer to the string that is to be printed
*
* This function prints a string from program memory to
* RS232. The string must be terminated by a null
* byte. The RS232 module must be correctly initalized and
* configured for this function to work.
*/
void rs232_print_p(prog_char *buf);
void
rs232_print_p(uint8_t port, prog_char *buf);
/**
* \brief Print a text string on RS232
* \param port The RS232 port to be used.
* \param str A pointer to the string that is to be printed
*
* This function prints a string to RS232. The string must
@ -85,16 +105,50 @@ void rs232_print_p(prog_char *buf);
* correctly initalized and configured for this function
* to work.
*/
void rs232_print(char *buf);
void
rs232_print(uint8_t port, char *buf);
/**
* \brief Print a formated string on RS232
* \param port The RS232 port to be used.
* \param fmt The format string that is used to construct the string
* from a variable number of arguments.
*
* This function prints a formated string to RS232. Note
* that this function used snprintf internally and thus cuts
* the resulting string after RS232_PRINTF_BUFFER_LENGTH - 1
* bytes. You can override this buffer lenght with the
* RS232_CONF_PRINTF_BUFFER_LENGTH define. The RS232 module
* must becorrectly initalized and configured for this
* function to work.
*/
void
rs232_printf(uint8_t port, const char *fmt, ...);
/**
* \brief Print a character on RS232
* \param port The RS232 port to be used.
* \param c The character to be printed
*
* This function prints a character to RS232. The RS232
* module must be correctly initalized and configured for
* this function to work.
*/
void rs232_send(unsigned char c);
void
rs232_send(uint8_t port, unsigned char c);
/**
* \brief Redirects stdout to a given RS232 port
* \param port The RS232 port to be used.
*
* This function redirects the stdout channel to a given
* RS232 port. Note that this modfies the global variable
* stdout. If you want to restore the previous behaviour, it
* is your responsibility to backup to old value. The RS232
* module must be correctly initalized and configured for
* the redirection to work.
*/
void
rs232_redirect_stdout (uint8_t port);
#endif /* __RS232_H__ */

127
cpu/avr/dev/rs232_atmega128.h Normal file
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@ -0,0 +1,127 @@
/*
* Copyright (c) 2006, Technical University of Munich
* 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.
*
* @(#)$$
*/
/**
* \file
* AVR specific definitions for the rs232 port.
*
* \author
* Simon Barner <barner@in.tum.de
*/
#ifndef __RS232_ATMEGA128__
#define __RS232_ATMEGA128__
/******************************************************************************/
/*** Includes */
/******************************************************************************/
#include <avr/io.h>
/******************************************************************************/
/*** RS232 ports */
/******************************************************************************/
#define RS232_PORT_0 0
#define RS232_PORT_1 1
/******************************************************************************/
/*** Baud rates */
/******************************************************************************/
#if MCU_MHZ == 16
/* Single speed operation (U2X = 0)*/
#define USART_BAUD_2400 416
#define USART_BAUD_4800 207
#define USART_BAUD_9600 103
#define USART_BAUD_14400 68
#define USART_BAUD_19200 51
#define USART_BAUD_28800 34
#define USART_BAUD_38400 25
#define USART_BAUD_57600 16
#define USART_BAUD_76800 12
#define USART_BAUD_115200 8
#define USART_BAUD_230400 3
#define USART_BAUD_250000 3
#define USART_BAUD_500000 1
#define USART_BAUD_1000000 0
#else
#error "Please define the baud rates for your CPU clock: ATmega128 handbook p. \
195-198 or set the rate in contiki-conf.h"
#endif
/******************************************************************************/
/*** Interrupt settings */
/******************************************************************************/
#define USART_INTERRUPT_RX_COMPLETE _BV (RXCIE)
#define USART_INTERRUPT_TX_COMPLETE _BV (TXCIE)
#define USART_INTERRUPT_DATA_REG_EMPTY _BV (UDRIE)
/******************************************************************************/
/*** Receiver / transmitter */
/******************************************************************************/
#define USART_RECEIVER_ENABLE _BV (RXEN)
#define USART_TRANSMITTER_ENABLE _BV (TXEN)
/******************************************************************************/
/*** Mode select */
/******************************************************************************/
#define USART_MODE_ASYNC 0x00
#define USART_MODE_SYNC _BV (UMSEL)
/******************************************************************************/
/*** Parity */
/******************************************************************************/
#define USART_PARITY_NONE 0x00
#define USART_PARITY_EVEN _BV (UPM1)
#define USART_PARITY_ODD _BV (UPM1) | _BV (UPM0)
/******************************************************************************/
/*** Stop bits */
/******************************************************************************/
#define USART_STOP_BITS_1 0x00
#define USART_STOP_BITS_2 _BV (USBS)
/******************************************************************************/
/*** Character size */
/******************************************************************************/
#define USART_DATA_BITS_5 0x00
#define USART_DATA_BITS_6 _BV (UCSZ0)
#define USART_DATA_BITS_7 _BV (UCSZ1)
#define USART_DATA_BITS_8 _BV (UCSZ1) | _BV (UCSZ0)
// #define USART_DATA_BITS_9 (needs also UCSZ2 bit in UCSRnB)
/******************************************************************************/
/*** Clock polarity */
/******************************************************************************/
#define USART_RISING_XCKN_EDGE 0x00
#define USART_FALLING_XCKN_EDGE _BV (UCPOL)
#endif /* #ifndef __RS232_ATMEGA128__ */