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Adding MS/TP demo for ATmega168. Not finished yet.

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This commit is contained in:
skarg
2007-08-15 00:12:19 +00:00
parent 53bc0932ad
commit 1b364d6df1
9 changed files with 531 additions and 0 deletions
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bacnet-stack/ports/atmega168/Makefile
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###############################################################################
# Makefile for the project bacnet
###############################################################################
## General Flags
PROJECT = bacnet
MCU = atmega168
TARGET = bacnet.elf
CC = avr-gcc.exe
## Options common to compile, link and assembly rules
COMMON = -mmcu=$(MCU)
## Compile options common for all C compilation units.
CFLAGS = $(COMMON)
CFLAGS += -Wall -gdwarf-2 -O0
CFLAGS += -MD -MP -MT $(*F).o -MF dep/$(@F).d
## Assembly specific flags
ASMFLAGS = $(COMMON)
ASMFLAGS += $(CFLAGS)
ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2
## Linker flags
LDFLAGS = $(COMMON)
LDFLAGS +=
## Intel Hex file production flags
HEX_FLASH_FLAGS = -R .eeprom
HEX_EEPROM_FLAGS = -j .eeprom
HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
HEX_EEPROM_FLAGS += --change-section-lma .eeprom=0 --no-change-warnings
## Include Directories
INCLUDES = -I"C:\code\bacnet-stack\ports\atmega168\..\.."
## Objects that must be built in order to link
OBJECTS = main.o rs485.o timer.o
## Objects explicitly added by the user
LINKONLYOBJECTS =
## Build
all: $(TARGET) bacnet.hex bacnet.eep size
## Compile
main.o: ../main.c
$(CC) $(INCLUDES) $(CFLAGS) -c $<
rs485.o: ../rs485.c
$(CC) $(INCLUDES) $(CFLAGS) -c $<
timer.o: ../timer.c
$(CC) $(INCLUDES) $(CFLAGS) -c $<
##Link
$(TARGET): $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) $(LINKONLYOBJECTS) $(LIBDIRS) $(LIBS) -o $(TARGET)
%.hex: $(TARGET)
avr-objcopy -O ihex $(HEX_FLASH_FLAGS) $< $@
%.eep: $(TARGET)
-avr-objcopy $(HEX_EEPROM_FLAGS) -O ihex $< $@ || exit 0
%.lss: $(TARGET)
avr-objdump -h -S $< > $@
size: ${TARGET}
@echo
@avr-size -C --mcu=${MCU} ${TARGET}
## Clean target
.PHONY: clean
clean:
-rm -rf $(OBJECTS) bacnet.elf dep/* bacnet.hex bacnet.eep
## Other dependencies
-include $(shell mkdir dep 2>/dev/null) $(wildcard dep/*)
bacnet-stack/ports/atmega168/avr035.h
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#ifndef AVR035_H
#define AVR035_H
/* from AVR035: Efficient C Coding for AVR */
/* a=register, b=bit number to act upon */
#define BIT_SET(a,b) ((a) |= (1<<(b)))
#define BIT_CLEAR(a,b) ((a) &= ~(1<<(b)))
#define BIT_FLIP(a,b) ((a) ^= (1<<(b)))
#define BIT_CHECK(a,b) ((a) & (1<<(b)))
/* x=target variable, y=mask */
#define BITMASK_SET(x,y) ((x) |= (y))
#define BITMASK_CLEAR(x,y) ((x) &= (~(y)))
#define BITMASK_FLIP(x,y) ((x) ^= (y))
#define BITMASK_CHECK(x,y) ((x) & (y))
#endif
bacnet-stack/ports/atmega168/bacnet.aps
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bacnet-stack/ports/atmega168/hardware.h
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#ifndef HARDWARE_H
#define HARDWARE_H
#include <avr/io.h>
#include <avr/interrupt.h>
#include "avr035.h"
#if !defined(__AVR_ATmega168__)
#error Firmware is configured for ATmega168 only.
#endif
/* The processor clock frequency */
#define FREQ_CPU (7372800)
#endif
bacnet-stack/ports/atmega168/main.c
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#include <stdbool.h>
#include <stdint.h>
#include "hardware.h"
#include "timer.h"
#include "rs485.h"
/* For porting to IAR, see:
http://www.avrfreaks.net/wiki/index.php/Documentation:AVR_GCC/IarToAvrgcc*/
static uint16_t Transmit_Timer = 0;
#define MAX_FRAME 5
static uint8_t Transmit_Frame[MAX_FRAME] = {0xAA, 0x55, 0x01, 0x45, 0xAB };
void init(void)
{
/* Initialize I/O ports */
/* For Port DDRx (Data Direction) Input=1, Output=1 */
/* For Port PORTx (Bit Value) TriState=0, High=1 */
DDRB = 0;
PORTB = 0;
DDRC = 0;
PORTC = 0;
DDRD = 0;
PORTD = 0;
/* Configure the watchdog timer */
/* Configure USART */
RS485_Set_Baud_Rate(38400);
RS485_Initialize();
/* Configure Timer0 for millisecond timer */
timer_initialize();
}
void task_milliseconds(void)
{
while (Timer_Milliseconds) {
Timer_Milliseconds--;
/* add other millisecond timer tasks here */
Transmit_Timer++;
}
}
int main(void)
{
init();
for (;;) {
task_milliseconds();
/* other tasks */
if (Transmit_Timer > 1000) {
Transmit_Timer = 0;
RS485_Send_Frame(NULL,Transmit_Frame, MAX_FRAME);
}
}
return 0;
}
bacnet-stack/ports/atmega168/rs485.c
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
/* The module handles sending data out the RS-485 port */
/* and handles receiving data from the RS-485 port. */
/* Customize this file for your specific hardware */
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include "mstp.h"
/* This file has been customized for use with ATMEGA168 */
#include "hardware.h"
/* baud rate */
static uint32_t RS485_Baud = 38400;
/****************************************************************************
* DESCRIPTION: Initializes the RS485 hardware and variables, and starts in
* receive mode.
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Initialize(void)
{
/* enable Transmit and Receive */
UCSR0B = _BV(TXEN0) | _BV(RXEN0);
/* Set frame format: 8data, 2stop bit */
UCSR0C = _BV(USBS0) | _BV(UCSZ00);
return;
}
void RS485_Cleanup(void)
{
}
/****************************************************************************
* DESCRIPTION: Returns the baud rate that we are currently running at
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
uint32_t RS485_Get_Baud_Rate(void)
{
return RS485_Baud;
}
/****************************************************************************
* DESCRIPTION: Sets the baud rate for the chip USART
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
bool RS485_Set_Baud_Rate(uint32_t baud)
{
bool valid = true;
switch (baud) {
case 9600:
case 19200:
case 38400:
case 57600:
case 76800:
case 115200:
RS485_Baud = baud;
/* 2x speed mode */
BIT_SET(UCSR0A,U2X0);
/* configure baud rate */
UBRR0 = (FREQ_CPU / (8UL * RS485_Baud)) - 1;
/* FIXME: store the baud rate */
break;
default:
valid = false;
break;
}
return valid;
}
/* Transmits a Frame on the wire */
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes) /* number of bytes of data (up to 501) */
{
uint8_t turnaround_time;
/* delay after reception - per MS/TP spec */
if (mstp_port) {
/* wait about 40 bit times since reception */
turnaround_time = (40UL*1000UL)/RS485_Baud;
if (!turnaround_time) {
turnaround_time = 1;
}
while (mstp_port->SilenceTimer < turnaround_time) {
/* do nothing - wait for timer to increment */
};
}
while (nbytes) {
while (!BIT_CHECK(UCSR0A,UDRE0)) {
/* do nothing - wait until Tx buffer is empty */
}
UDR0 = *buffer;
buffer++;
nbytes--;
/* per MSTP spec */
if (mstp_port) {
mstp_port->SilenceTimer = 0;
}
}
while (!BIT_CHECK(UCSR0A,UDRE0)) {
/* do nothing - wait until Tx buffer is empty */
}
return;
}
/* called by timer, interrupt(?) or other thread */
void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
{
if (mstp_port->ReceiveError == true) {
/* wait for state machine to clear this */
}
/* wait for state machine to read from the DataRegister */
else if (mstp_port->DataAvailable == false) {
/* check for data */
if (!BIT_CHECK(UCSR0A,RXC0)) {
mstp_port->DataRegister = UDR0;
mstp_port->DataAvailable = true;
}
}
}
bacnet-stack/ports/atmega168/rs485.h
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#ifndef RS485_H
#define RS485_H
#include <stdint.h>
#include "mstp.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
void RS485_Initialize(void);
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes); /* number of bytes of data (up to 501) */
uint8_t RS485_Check_UART_Data(
volatile struct mstp_port_struct_t *mstp_port); /* port specific data */
uint32_t RS485_Get_Baud_Rate(void);
bool RS485_Set_Baud_Rate(uint32_t baud);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif
bacnet-stack/ports/atmega168/timer.c
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#include "hardware.h"
/* Prescaling: 1, 8, 64, 256, 1024 */
#define TIMER_1_PRESCALER 1
/* Count: Timer counts up to 0xFFFF and then signals overflow */
#define TIMER_1_TICKS (FREQ_CPU/TIMER_1_PRESCALER/1000)
#define TIMER_1_COUNT (0xFFFF-TIMER_1_TICKS)
/* Global variable millisecond timer - used by main.c for timers task */
volatile uint8_t Timer_Milliseconds = 0;
/* Configure the Timer */
void timer_initialize(void)
{
/* Normal Operation */
TCCR1A = 0;
/* CS10 = clkI/O/1 (No prescaling) */
TCCR1B = _BV(CS10);
/* Clear any TOV1 Flag set when the timer overflowed */
BIT_CLEAR(TIFR1,TOV1);
/* Initial value */
TCNT1 = TIMER_1_COUNT;
/* Enable the overflow interrupt */
BIT_SET(TIMSK1,TOIE1);
}
/* Timer Overflowed! Increment the time. */
ISR(TIMER1_OVF_vect)
{
/* Set the counter for the next interrupt */
TCNT1 = TIMER_1_COUNT;
/* Overflow Flag is automatically cleared */
if (Timer_Milliseconds < 0xFF)
Timer_Milliseconds++;
}
bacnet-stack/ports/atmega168/timer.h
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#ifndef TIMER_H
#define TIMER_H
extern volatile uint8_t Timer_Milliseconds;
void timer_initialize(void);
#endif