Tooltron

# Hey Emacs, this is a -*- makefile -*-

#----------------------------------------------------------------------------

# WinAVR Makefile Template written by Eric B. Weddington, Jörg Wunsch, et al.

#

# Released to the Public Domain

#

# Additional material for this makefile was written by:

# Peter Fleury

# Tim Henigan

# Colin O'Flynn

# Reiner Patommel

# Markus Pfaff

# Sander Pool

# Frederik Rouleau

#

#----------------------------------------------------------------------------

# On command line:

#

# make all = Make software.

#

# make clean = Clean out built project files.

#

# make coff = Convert ELF to AVR COFF.

#

# make extcoff = Convert ELF to AVR Extended COFF.

#

# make program = Download the hex file to the device, using avrdude.

#                Please customize the avrdude settings below first!

#

# make debug = Start either simulavr or avarice as specified for debugging,

#              with avr-gdb or avr-insight as the front end for debugging.

#

# make filename.s = Just compile filename.c into the assembler code only.

#

# make filename.i = Create a preprocessed source file for use in submitting

#                   bug reports to the GCC project.

#

# To rebuild project do "make clean" then "make all".

#----------------------------------------------------------------------------

# MCU name

MCU = attiny2313

# Processor frequency.

#     This will define a symbol, F_CPU, in all source code files equal to the

#     processor frequency. You can then use this symbol in your source code to

#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done

#     automatically to create a 32-bit value in your source code.

F_CPU = 8000000

# Output format. (can be srec, ihex, binary)

FORMAT = ihex

# Target file name (without extension).

TARGET = main

# List C source files here. (C dependencies are automatically generated.)

//SRC =  $(wildcard *.c)

SRC = main.c

# List Assembler source files here.

#     Make them always end in a capital .S.  Files ending in a lowercase .s

#     will not be considered source files but generated files (assembler

#     output from the compiler), and will be deleted upon "make clean"!

#     Even though the DOS/Win* filesystem matches both .s and .S the same,

#     it will preserve the spelling of the filenames, and gcc itself does

#     care about how the name is spelled on its command-line.

ASRC =

# Optimization level, can be [0, 1, 2, 3, s].

#     0 = turn off optimization. s = optimize for size.

#     (Note: 3 is not always the best optimization level. See avr-libc FAQ.)

OPT = s

# Debugging format.

#     Native formats for AVR-GCC's -g are dwarf-2 [default] or stabs.

#     AVR Studio 4.10 requires dwarf-2.

#     AVR [Extended] COFF format requires stabs, plus an avr-objcopy run.

DEBUG =

# List any extra directories to look for include files here.

#     Each directory must be seperated by a space.

#     Use forward slashes for directory separators.

#     For a directory that has spaces, enclose it in quotes.

#EXTRAINCDIRS = C:\WinAVR\include\fwr

# Compiler flag to set the C Standard level.

#     c89   = "ANSI" C

#     gnu89 = c89 plus GCC extensions

#     c99   = ISO C99 standard (not yet fully implemented)

#     gnu99 = c99 plus GCC extensions

CSTANDARD = -std=gnu99

# Place -D or -U options here

CDEFS = -DF_CPU=$(F_CPU)UL

# Place -I options here

CINCS =

#---------------- Compiler Options ----------------

#  -g*:          generate debugging information

#  -O*:          optimization level

#  -f...:        tuning, see GCC manual and avr-libc documentation

#  -Wall...:     warning level

#  -Wa,...:      tell GCC to pass this to the assembler.

#    -adhlns...: create assembler listing

#CFLAGS = -g$(DEBUG)

CFLAGS += $(CDEFS) $(CINCS)

CFLAGS += -O$(OPT)

CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums

CFLAGS += -Wall -Wstrict-prototypes

CFLAGS += -Wa,-adhlns=$(<:.c=.lst)

CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))

CFLAGS += $(CSTANDARD)

#---------------- Assembler Options ----------------

#  -Wa,...:   tell GCC to pass this to the assembler.

#  -ahlms:    create listing

#  -gstabs:   have the assembler create line number information; note that

#             for use in COFF files, additional information about filenames

#             and function names needs to be present in the assembler source

#             files -- see avr-libc docs [FIXME: not yet described there]

ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs

#---------------- Library Options ----------------

# Minimalistic printf version

PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min

# Floating point printf version (requires MATH_LIB = -lm below)

PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt

# If this is left blank, then it will use the Standard printf version.

PRINTF_LIB =

#PRINTF_LIB = $(PRINTF_LIB_MIN)

#PRINTF_LIB = $(PRINTF_LIB_FLOAT)

# Minimalistic scanf version

SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min

# Floating point + %[ scanf version (requires MATH_LIB = -lm below)

SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt

# If this is left blank, then it will use the Standard scanf version.

SCANF_LIB =

#SCANF_LIB = $(SCANF_LIB_MIN)

#SCANF_LIB = $(SCANF_LIB_FLOAT)

MATH_LIB = -lm

#---------------- External Memory Options ----------------

# 64 KB of external RAM, starting after internal RAM (ATmega128!),

# used for variables (.data/.bss) and heap (malloc()).

#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff

# 64 KB of external RAM, starting after internal RAM (ATmega128!),

# only used for heap (malloc()).

#EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff

EXTMEMOPTS =

#---------------- Linker Options ----------------

#  -Wl,...:     tell GCC to pass this to linker.

#    -Map:      create map file

#    --cref:    add cross reference to  map file

LDFLAGS = -Wl,-Map=$(TARGET).map,--cref

LDFLAGS += $(EXTMEMOPTS)

LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)

#---------------- Programming Options (avrdude) ----------------

# Programming hardware: alf avr910 avrisp bascom bsd

# dt006 pavr picoweb pony-stk200 sp12 stk200 stk500

#

# Type: avrdude -c ?

# to get a full listing.

#

AVRDUDE_PROGRAMMER = avrispmkII

# com1 = serial port. Use lpt1 to connect to parallel port.

AVRDUDE_PORT = usb

# programmer connected to serial device

AVRDUDE_WRITE_FLASH = -b 19200 -U flash:w:$(TARGET).hex #speed was 4800

#AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep

# Uncomment the following if you want avrdude's erase cycle counter.

# Note that this counter needs to be initialized first using -Yn,

# see avrdude manual.

#AVRDUDE_ERASE_COUNTER = -y

# Uncomment the following if you do /not/ wish a verification to be

# performed after programming the device.

#AVRDUDE_NO_VERIFY = -V

# Increase verbosity level.  Please use this when submitting bug

# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude>

# to submit bug reports.

#AVRDUDE_VERBOSE = -v -v

AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER) -F

AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)

AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)

AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)

#---------------- Debugging Options ----------------

# For simulavr only - target MCU frequency.

DEBUG_MFREQ = $(F_CPU)

# Set the DEBUG_UI to either gdb or insight.

# DEBUG_UI = gdb

DEBUG_UI = insight

# Set the debugging back-end to either avarice, simulavr.

DEBUG_BACKEND = avarice

#DEBUG_BACKEND = simulavr

# GDB Init Filename.

GDBINIT_FILE = __avr_gdbinit

# When using avarice settings for the JTAG

JTAG_DEV = /dev/com1

# Debugging port used to communicate between GDB / avarice / simulavr.

DEBUG_PORT = 4242

# Debugging host used to communicate between GDB / avarice / simulavr, normally

#     just set to localhost unless doing some sort of crazy debugging when

#     avarice is running on a different computer.

DEBUG_HOST = localhost

#============================================================================

# Define programs and commands.

SHELL = sh

CC = avr-gcc

OBJCOPY = avr-objcopy

OBJDUMP = avr-objdump

SIZE = avr-size

NM = avr-nm

AVRDUDE = avrdude

REMOVE = rm -f

COPY = cp

WINSHELL = cmd

# Define Messages

# English

MSG_ERRORS_NONE = Errors: none

MSG_BEGIN = -------- begin --------

MSG_END = --------  end  --------

MSG_SIZE_BEFORE = Size before:

MSG_SIZE_AFTER = Size after:

MSG_COFF = Converting to AVR COFF:

MSG_EXTENDED_COFF = Converting to AVR Extended COFF:

MSG_FLASH = Creating load file for Flash:

MSG_EEPROM = Creating load file for EEPROM:

MSG_EXTENDED_LISTING = Creating Extended Listing:

MSG_SYMBOL_TABLE = Creating Symbol Table:

MSG_LINKING = Linking:

MSG_COMPILING = Compiling:

MSG_ASSEMBLING = Assembling:

MSG_CLEANING = Cleaning project:

# Define all object files.

OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)

# Define all listing files.

LST = $(SRC:.c=.lst) $(ASRC:.S=.lst)

# Compiler flags to generate dependency files.

GENDEPFLAGS = -MD -MP -MF .dep/$(@F).d

# Combine all necessary flags and optional flags.

# Add target processor to flags.

ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)

ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)

# Default target.

all: begin gccversion sizebefore build sizeafter end

build: elf hex eep lss sym

elf: $(TARGET).elf

hex: $(TARGET).hex

eep: $(TARGET).eep

lss: $(TARGET).lss

sym: $(TARGET).sym

# Eye candy.

# AVR Studio 3.x does not check make's exit code but relies on

# the following magic strings to be generated by the compile job.

begin:

	@echo

	@echo $(MSG_BEGIN)

end:

	@echo $(MSG_END)

	@echo

# Display size of file.

HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex

ELFSIZE = $(SIZE) -A $(TARGET).elf

AVRMEM = avr-mem.sh $(TARGET).elf $(MCU)

sizebefore:

	@if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); \

	$(AVRMEM) 2>/dev/null; echo; fi

sizeafter:

	@if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); \

	$(AVRMEM) 2>/dev/null; echo; fi

# Display compiler version information.

gccversion :

	@$(CC) --version

# Program the device.

program: $(TARGET).hex $(TARGET).eep

	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)

# Generate avr-gdb config/init file which does the following:

#     define the reset signal, load the target file, connect to target, and set

#     a breakpoint at main().

gdb-config:

	@$(REMOVE) $(GDBINIT_FILE)

	@echo define reset >> $(GDBINIT_FILE)

	@echo SIGNAL SIGHUP >> $(GDBINIT_FILE)

	@echo end >> $(GDBINIT_FILE)

	@echo file $(TARGET).elf >> $(GDBINIT_FILE)

	@echo target remote $(DEBUG_HOST):$(DEBUG_PORT)  >> $(GDBINIT_FILE)

ifeq ($(DEBUG_BACKEND),simulavr)

	@echo load  >> $(GDBINIT_FILE)

endif

	@echo break main >> $(GDBINIT_FILE)

debug: gdb-config $(TARGET).elf

ifeq ($(DEBUG_BACKEND), avarice)

	@echo Starting AVaRICE - Press enter when "waiting to connect" message displays.

	@$(WINSHELL) /c start avarice --jtag $(JTAG_DEV) --erase --program --file \

	$(TARGET).elf $(DEBUG_HOST):$(DEBUG_PORT)

	@$(WINSHELL) /c pause

else

	@$(WINSHELL) /c start simulavr --gdbserver --device $(MCU) --clock-freq \

	$(DEBUG_MFREQ) --port $(DEBUG_PORT)

endif

	@$(WINSHELL) /c start avr-$(DEBUG_UI) --command=$(GDBINIT_FILE)

# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.

COFFCONVERT=$(OBJCOPY) --debugging \

--change-section-address .data-0x800000 \

--change-section-address .bss-0x800000 \

--change-section-address .noinit-0x800000 \

--change-section-address .eeprom-0x810000

coff: $(TARGET).elf

	@echo

	@echo $(MSG_COFF) $(TARGET).cof

	$(COFFCONVERT) -O coff-avr $< $(TARGET).cof

extcoff: $(TARGET).elf

	@echo

	@echo $(MSG_EXTENDED_COFF) $(TARGET).cof

	$(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof

# Create final output files (.hex, .eep) from ELF output file.

%.hex: %.elf

	@echo

	@echo $(MSG_FLASH) $@

	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@

%.eep: %.elf

	@echo

	@echo $(MSG_EEPROM) $@

	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \

	--change-section-lma .eeprom=0 -O $(FORMAT) $< $@

# Create extended listing file from ELF output file.

%.lss: %.elf

	@echo

	@echo $(MSG_EXTENDED_LISTING) $@

	$(OBJDUMP) -h -S $< > $@

# Create a symbol table from ELF output file.

%.sym: %.elf

	@echo

	@echo $(MSG_SYMBOL_TABLE) $@

	$(NM) -n $< > $@

# Link: create ELF output file from object files.

.SECONDARY : $(TARGET).elf

.PRECIOUS : $(OBJ)

%.elf: $(OBJ)

	@echo

	@echo $(MSG_LINKING) $@

	$(CC) $(ALL_CFLAGS) $^ --output $@ $(LDFLAGS)

# Compile: create object files from C source files.

%.o : %.c

	@echo

	@echo $(MSG_COMPILING) $<

	$(CC) -c $(ALL_CFLAGS) $< -o $@

# Compile: create assembler files from C source files.

%.s : %.c

	$(CC) -S $(ALL_CFLAGS) $< -o $@

# Assemble: create object files from assembler source files.

%.o : %.S

	@echo

	@echo $(MSG_ASSEMBLING) $<

	$(CC) -c $(ALL_ASFLAGS) $< -o $@

# Create preprocessed source for use in sending a bug report.

%.i : %.c

	$(CC) -E -mmcu=$(MCU) -I. $(CFLAGS) $< -o $@

# Target: clean project.

clean: begin clean_list end

clean_list :

	@echo

	@echo $(MSG_CLEANING)

	$(REMOVE) $(TARGET).hex

	$(REMOVE) $(TARGET).eep

	$(REMOVE) $(TARGET).cof

	$(REMOVE) $(TARGET).elf

	$(REMOVE) $(TARGET).map

	$(REMOVE) $(TARGET).sym

	$(REMOVE) $(TARGET).lss

	$(REMOVE) $(OBJ)

	$(REMOVE) $(LST)

	$(REMOVE) $(SRC:.c=.s)

	$(REMOVE) $(SRC:.c=.d)

	$(REMOVE) .dep/*

# Include the dependency files.

-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)

# Listing of phony targets.

.PHONY : all begin finish end sizebefore sizeafter gccversion \

build elf hex eep lss sym coff extcoff \

clean clean_list program debug gdb-config

/** @file timer.c

 * 

 *  @brief Implements the timer functions. See timer.h for full details

 *

 * 	@author Kevin Woo (kwoo)

 */

#include "timer.h"

#include <avr/io.h>

#include <avr/interrupt.h>

volatile char seconds;		//Seconds elapsed

volatile char minutes;		//Minutes exlapsed

char timeout_flag; //Indicates that timeout has occured

//Initializes all the timer1 registers

void init_timer() {

	//Clears the control registers for timer 1

	TCCR1A = 0x00;

	TCCR1B = 0x00;

	TCCR1C = 0x00;

	TIMSK = 0x00;

	/*****

	 * Output control register A set to clear timer on compare match.

	 * Output control register B not connected.

	 * WGM is in normal operation.

	 * Clock is divided by 256. (This sets it to disconnected, connects

	 *   in start_timer to above value).

	 *****/

	TCCR1A |= _BV(COM1A1);

	//Compares at 1 second with an 8MHz Clock and a 256 prescale. (31250)

	OCR1AH = 0x7A;

	OCR1AL = 0x12;

	//Enable the output compare register 1A interrupt

	TIMSK |= _BV(OCIE1A);

	timeout_flag = 0;

	return;

}

void start_timer() {

	//Enables the timer. Sets prescale to 256.

	TCCR1B |= _BV(CS12);

	return;

}

void stop_timer() {

	//Disables timer.

	TCCR1B &= ~_BV(CS12);

	seconds = 0;

	minutes = 0;

	return;

}

void reset_timer() {

	seconds = 0;

	minutes = 0;

	return;

}

ISR(TIMER1_COMP1_vect) {

	if (seconds == 59) {

		minutes++;

		seconds = 0;

	} else {

		seconds++;

	}

}

/** @file uart.c

 *	

 *	@brief Implements UART functionality in hardware

 *

 *	@author Kevin Woo (kwoo)

 */

#include "uart.h"

char received_byte;							//Byte received

char *transmit_data;						//String to send

char transmit_size;							//Size of string that we are sending

char byte_ready;								//New byte has been received

char transmitting;

static void init_uart(int baud) {

	/* Set baud rate */

	UBRRH = (unsigned char)(baud>>8);

	UBRRL = (unsigned char)baud;

	/* Enable RX/TX and RX/TX Interrupt */

	UCSRB = _BV(RXCIE) | _BV(RXEN) | _BV(TXCIE) | _BV(TXEN);

	/* Asynchronous mode, 1 bit stop, 8bit transmissions */

	UCSRC = _BV(UCSZ1) | _BV(UCSZ0) | ~_BV(USBS);

 	/* Enable RX pin as input */

	PORTD &= ~RX;

	/* Enable TX pin as output */

	DDRD |= TX;

	/* Enable the TXEN pin as output */

	DDRB |= TX_EN;

	/* RX Status Variables */

	received_byte = 0;	//Initialize first byte

	byte_ready = 0;		//Byte is not ready to be read	

	/* TX Status Variables */

	transmitting = 0;

	transmit_size = 0;

}

static char uart_get_byte(char *output_byte) {

	if (byte_ready) {

		*output_byte = received_byte;

		byte_ready = 0;

		return 0;

	} else {

		return -1;

	}

}

static void uart_send_bytes(char *data, int size) {

	//Waits until current transmit is done

	while (transmitting);

	uart_enable_transmit(UART_TX_ON);

	transmitting = 1;

	transmit_size = size;

	transmit_data = data;

	return;

}

static void uart_enable_transmit(char state) {

	if (state == UART_TX_ON) {

		PINB |= TX_EN;

	} else {

		PINB &= ~TX_EN;

	}

}

ISR(UART_RX_vect) {

	received_byte = UDR;

	byte_ready = 1;

}

ISR(UART_TX_vect) {

	static volatile char position = 0;

	if (transmitting) {

		if (position < transmit_size) {

			UDR = transmit_data[position];

			position++;

		} else {

			position = 0;

			transmitting = 0;

			uart_enable_transmit(UART_TX_OFF);

		}

	}

}

/** @file uart.h

 *

 *	@brief Initializes UART functions using the UART hardware module

 *

 *	@author Kevin Woo (kwoo)

 */

#ifndef UART_H

#define UART_H

#include <avr/io.h>

#include <avr/interrupt.h>

/** **/

#define UART_TX_OFF 0

#define UART_TX_ON 1

/** @brief RX Pin for the UART **/

#define RX		_BV(PD0)

#define TX		_BV(PD1)

#define TX_EN	_BV(PB1)

/** @brief The most recently received byte **/

//extern char received_byte;

/** @brief If the value in received_byte has been read or not **/

//extern char	byte_ready;

//extern char *transmit_data;

//extern char transmit_size;

//extern char transmitting;

/** @brief Initializes the UART registers and sets it to the buad rate which msut be the 

 *			value that is defined in the datasheet for any particular speed (ie: 51 -> 9600bps)

 **/

static inline void init_uart(int baud);

/** @brief Gets latest byte and returns it in output_byte. If the byte was already read, returns -1 

 *			otherwise it returns 0 

 **/

static char uart_get_byte(char *output_byte);

/** @brief Sends a character array of size size. If we are currently transmitting it will block until the

  * 	the current transmit is done. 

  **/

static void uart_send_byte(char data);

static inline void uart_enable_transmit(void);

static inline void uart_disable_transmit(void);

#endif

/** @file timer.h

 *	

 * 	@breif Timer functions

 *

 *	@author Kevin Woo (kwoo)

 */

#ifndef TIMER_H

#define TIMER_H

/** @brief Max time that we can wait for a full packet from the server before we timeout */

#define TIME_OUT		5

/** @brief Seconds that have elapsed since the timer started */

//extern volatile char seconds;

/** @brief Minutes that have elapsed since the timer started */

//extern volatile char minutes;

//extern char timeout_flag;

/** @brief Sets the registers to use the timer for couting in real time */

static inline void init_timer(void);

/** @brief Starts the timer from last position*/

static inline void start_timer(void);

/** @brief Stops the timer from counting*/

static inline void stop_timer(void);

/** @brief Resets the values of the timer to 0*/

static inline void reset_timer(void);

#endif

/*****************************************************************************

*

* Copyright (C) 2003 Atmel Corporation

*

* File          : USI_UART_config.h

* Compiler      : IAR EWAAVR 2.28a

* Created       : 18.07.2002 by JLL

* Modified      : 02-10-2003 by LTA

*

* Support mail  : avr@atmel.com

*

* AppNote       : AVR307 - Half duplex UART using the USI Interface

*

* Description   : Header file for USI_UART driver

*

*

****************************************************************************/

#ifndef __USI_UART_config_h

#define __USI_UART_config_h

//********** USI UART Defines **********//

//#define SYSTEM_CLOCK             14745600

//#define SYSTEM_CLOCK             11059200

#define SYSTEM_CLOCK              8000000

//#define SYSTEM_CLOCK              7372800

//#define SYSTEM_CLOCK              3686400

//#define SYSTEM_CLOCK              2000000

//#define SYSTEM_CLOCK              1843200

//#define SYSTEM_CLOCK              1000000

//#define BAUDRATE                   115200

//#define BAUDRATE                    57600

//#define BAUDRATE                    28800

//#define BAUDRATE                    19200

//#define BAUDRATE                    14400

#define BAUDRATE                     9600

//#define TIMER_PRESCALER           1

#define TIMER_PRESCALER           8     

#define UART_RX_BUFFER_SIZE        4     /* 2,4,8,16,32,64,128 or 256 bytes */

#define UART_TX_BUFFER_SIZE        4

//********** USI_UART Prototypes **********//

static unsigned char			RxStream[100];

static unsigned char 			RxIndex;

static unsigned char USI_UART_Receive_Bytes( void );

static inline unsigned char USI_UART_Data_In_Receive_Buffer( void );

static inline unsigned char Bit_Reverse( unsigned char );

static inline void          USI_UART_Initialise_Receiver( void );

//Don't use these

void          USI_UART_Initialise_Transmitter( void );

void          USI_UART_Transmit_Byte( unsigned char );

void          USI_UART_Flush_Buffers( void );

//End

#endif

/*****************************************************************************

*

* Copyright (C) 2003 Atmel Corporation

*

* File              : USI_UART.c

* Compiler          : IAR EWAAVR 2.28a

* Created           : 18.07.2002 by JLL

* Modified          : 02-10-2003 by LTA

*

* Support mail      : avr@atmel.com

*

* Supported devices : ATtiny26

*

* Application Note  : AVR307 - Half duplex UART using the USI Interface

*

* Description       : Functions for USI_UART_receiver and USI_UART_transmitter.

*                     Uses Pin Change Interrupt to detect incomming signals.

*

*

****************************************************************************/

//#include <avr/io.h>  // Note there is a bug in ioavr.h file that includes iotiny22.h instead of iotiny26.h.

//#include <iotiny26.h>

//#include <avr/interrupt.h>

//#include <avr/signal.h>

//#include "USI_UART_config.h"

//********** USI UART Defines **********//

#define RXPIN	PB5

#define CLKPIN	PB7

#define STARTFLAG 		0x45 //100 0101 //0x0B  //01011

#define NSTARTFLAG		0x3A //011 1010 //0x14  //10100

#define STOPFLAG      0x1F //001 1111  0x1F  //11111

#define NSTOPFLAG		  0x60 //110 0000 0x00  //00000

#define REVSTART      0x51 //101 0001  0x1A  //11010

#define NREVSTART		  0x2E //010 1110 0x05  //00101

#define DATA_BITS                 7

#define START_BIT                 7

#define STOP_BIT                  7

#define HALF_FRAME                7

#define USI_COUNTER_MAX_COUNT     16

#define INTERRUPT_STARTUP_DELAY   (0x11 / TIMER_PRESCALER)

#define USI_COUNTER_SEED_RECEIVE  ( USI_COUNTER_MAX_COUNT - (DATA_BITS*2) )

/* General defines */

#define TRUE                      1

#define FALSE                     0

//********** Static Variables **********//

/*__no_init __regvar static unsigned char USI_UART_TxData[15];   // Tells the compiler to store the byte to be transmitted in registry.

*/

//static unsigned char			USI_UART_TxData;

//static unsigned char          UART_RxByte;  // UART buffers. Size is definable in the header file.

static volatile union USI_UART_status                           // Status byte holding flags.

{

    unsigned char status;

    struct

    {

        unsigned char wait_Card:1;

        unsigned char wait_Start:1;

        unsigned char ongoing_Reception_Of_Package:1;

        unsigned char reception_Buffer_Overflow:1;

        unsigned char data_Ready:1;

        unsigned char flag5:1;

        unsigned char flag6:1;

        unsigned char flag7:1;

    };

} USI_UART_status = {0};

//********** USI_UART functions **********//

// Reverses the order of bits in a byte.

// I.e. MSB is swapped with LSB, etc.

static inline unsigned char Bit_Reverse5( unsigned char x )

{

	unsigned char c = x&0x04;

//	x = x<<3;

    x = ((x >> 1) & 0x09) | ((x << 1) & 0x12);

    x = ((x >> 3) & 0x03) | ((x << 3) & 0x18)|c;

//    x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);

    return x;

}

static inline unsigned char Bit_Reverse( unsigned char x )

{

  unsigned char c=0;

  c |=0x01&(x>>6);

  c |=0x02&(x>>4);

  c |=0x04&(x>>2);

  c |=0x08&(x>>0);

  c |=0x10&(x<<2);

  c |=0x20&(x<<4);

  c |=0x40&(x<<6);

//	unsigned char c = x&0x08;

//	x = x<<3;

//    x = ((x >> 1) & 0x09) | ((x << 1) & 0x12);

//    x = ((x >> 3) & 0x03) | ((x << 3) & 0x18)|c;

//    x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);

//    return x;

  return c;

}

// Initialise USI for UART reception.

// Note that this function only enables pinchange interrupt on the USI Data Input pin.

// The USI is configured to read data within the pinchange interrupt.

static inline void USI_UART_Initialise_Receiver( void ) {

    // Enable pull up on USI DO, DI and SCK pins. (And PB3 because of pin change interrupt)

    PORTB |=   _BV(PB7) | _BV(PB6) | _BV(PB5) | _BV(PB4);

    // Set USI DI, DO and SCK pins as inputs.

    DDRB  &= ~( _BV(PB7) | _BV(PB6) | _BV(PB5) | _BV(PB4));

    // Disable USI.

    USICR = 0;

    // Clear pin change interrupt flag.

    EIFR = _BV(PCIF);

	PCMSK |= _BV(RXPIN);

	// Enable pin change interrupt for PB7:0.

    GIMSK |= _BV(PCIE);

	USI_UART_status.data_Ready=FALSE;

	USI_UART_status.wait_Card=TRUE;

	USI_UART_status.wait_Start=FALSE;

	USI_UART_status.ongoing_Reception_Of_Package = FALSE;

	RxIndex=0;

}

// Returns a byte from the receive buffer. Waits if buffer is empty.

static inline unsigned char USI_UART_Receive_Bytes(void) {

    while ( !USI_UART_status.data_Ready );                 // Wait for incomming data

	USI_UART_status.data_Ready=FALSE;

    return RxIndex;              // Reverse the order of the bits in the data byte before it returns data from the buffer.

}

// Check if there is data in the receive buffer.

static inline unsigned char USI_UART_Data_In_Receive_Buffer(void) {

    return (USI_UART_status.data_Ready);

}

// ********** Interrupt Handlers ********** //

// The pin change interrupt is used to detect USI_UART reseption.

// It is here the USI is configured to sample the UART signal.

ISR(PCINT_vect)

{

   if ((USI_UART_status.wait_Card)&&(!( PINB & (1<<RXPIN) )))     // If the USI DI pin is low, then it is likely that it

    {                                                             //  was this pin that generated the pin change interrupt.

        USICR  = (0<<USISIE) | (1<<USIOIE) |                       // Enable USI Counter OVF interrupt.

                 (0<<USIWM1) | (1<<USIWM0) |                      // Select Three Wire mode.

                 (0<<USICS1) | (1<<USICS0) | (0<<USICLK) |        // Select Timer0 OVER as USI Clock source.

                 (0<<USITC);

                                                                  // Note that enabling the USI will also disable the pin change interrupt.

        USISR  = 0xF0 | USI_COUNTER_SEED_RECEIVE;                 // Clear all USI interrupt flags and preload the USI counter to generate interrupt.

        PCMSK |= _BV(CLKPIN);

        PCMSK &= ~_BV(RXPIN);

        //GIMSK &=  ~(1<<PCIE);                                    // Disable pin change interrupt for PB3:0.

        USI_UART_status.wait_Start = TRUE;

        USI_UART_status.wait_Card = FALSE;

    }

	else if((USI_UART_status.wait_Start)&&(!(PINB&(1<<CLKPIN))))

	{

//	   	PORTD |= (1<<PD4);

		if((USIDR&0x7F)==(NREVSTART))  /////////////MAYBE SHOULD BE REVSTART

		{

			USI_UART_status.wait_Start = FALSE;

			USI_UART_status.ongoing_Reception_Of_Package = TRUE;

			USISR  = 0xF0 | USI_COUNTER_SEED_RECEIVE;                 // Clear all USI interrupt flags, preload the USI counter to generate an interrupt

			GIMSK &= ~(1<<PCIE);

			PCMSK &=~(1<<CLKPIN);

		}

	}

}

// The USI Counter Overflow interrupt is used for moving data between memmory and the USI data register.

// The interrupt is used for both transmission and reception.

ISR(SIG_USI_OVERFLOW) {

  led_on(LED_YELLOW);

    if(USI_UART_status.ongoing_Reception_Of_Package) {

		char b;

        //Byte comes in inverted and backwards, invert and reverse it to make it correct

		b=Bit_Reverse(~USIDR)&0x0F;

        //End character

		if(b>9) {

            USICR  =  0;                                // Disable USI.

            EIFR   =  _BV(PCIF);                        // Clear pin change interrupt flag.

		    USI_UART_status.data_Ready=TRUE;

		} else {

			//RxStream[RxIndex] = b;                      // Store received data in buffer. Note that the data must be bit reversed before used.

			//RxIndex=RxIndex+1;

			//WARNING: This is potentially dangerous if the card is larger than we expect. We should probably put some checks in here

			// to prevent buffer

			packet[RxIndex + HEADER_OFFSET] = b;

			RxIndex++;

			USISR  = 0xF0 | USI_COUNTER_SEED_RECEIVE;   // Clear all USI interrupt flags and Preload the USI counter to generate interrupt.

		}

    }

      led_on(LED_GREEN);

}

#include "uart.h"

#include <avr/io.h>

/** @file uart.c

 *

 *	@brief Implements UART functionality in hardware

 *

 *	@author Kevin Woo (kwoo)

 */

static  void init_uart(int baud) {

	/* Set baud rate */

	UBRRH = (unsigned char)(baud>>8);

	UBRRL = (unsigned char)baud;

	UCSRB = 0;

	UCSRC = 0;

	/* Enable RX/TX and RX/TX Interrupt */

	UCSRB = _BV(RXCIE) | _BV(RXEN) | _BV(TXCIE) | _BV(TXEN);

	/* Asynchronous mode, 1 bit stop, 8bit transmissions */

	UCSRC = _BV(UCSZ1) | _BV(UCSZ0);

 	/* Enable RX pin as input */

	PORTD &= ~RX;

	/* Enable TX pin as output */

	DDRD |= TX;

	/* Enable the TXEN pin as output */

	DDRB |= TX_EN;

	/* RX Status Variables */

	received_byte = 0;	//Initialize first byte

	byte_ready = 0;		//Byte is not ready to be read

	/* TX Status Variables */

	transmitting = 0;

	transmit_size = 0;

}

static char uart_get_byte(char *output_byte) {

	while (!byte_ready) {

		if (seconds == TIME_OUT) {

		    timeout_flag = 1;

		    return;

	    }

	}

	*output_byte = received_byte;

	return received_byte;

	/*

	if (byte_ready) {

		*output_byte = received_byte;

		byte_ready = 0;

		return 0;

	} else {

		return -1;

	}

	*/

}

static void uart_puts (char* str, int len){

  for(int i=0;i<len;i++){

    uart_send_byte('@');//trash byte //TODO: figure out whats going on here

    uart_send_byte(str[i]);

  }

}

static void uart_send_byte (char data) {

    //Wait for the UART line to not be busy sending

	while (!(UCSRA & (1 << UDRE)));

    //Enable RS485 Converter, give it time to turn on

	uart_enable_transmit();

    _delay_loop_2(8000);    //Approxmiately 2ms

	//led_on(LED_RED);

	UDR = data;

	//led_on(LED_YELLOW);

}

static  void uart_enable_transmit() {

    PINB |= TX_EN;

}

static  void uart_disable_transmit() {

	PINB &= ~TX_EN;

}

ISR(USART_RX_vect) {

	while(1);

	received_byte = UDR;

	byte_ready = 1;

}

ISR(USART_TX_vect) {

	//static volatile char loc = 1;

	//if (transmitting) {

		//if (loc < transmit_size) {

		//	UDR = transmit_data[loc];

		//	loc++;

		//} else {

		//	loc = 1;

			//transmitting = 0;

			_delay_loop_2(8000);    //Approxmiately 2ms

			uart_disable_transmit();

			//led_on(LED_GREEN);

		//}

	//}

}

# Hey Emacs, this is a -*- makefile -*-

#----------------------------------------------------------------------------

# WinAVR Makefile Template written by Eric B. Weddington, Jörg Wunsch, et al.

#

# Released to the Public Domain

#

# Additional material for this makefile was written by:

# Peter Fleury

# Tim Henigan

# Colin O'Flynn

# Reiner Patommel

# Markus Pfaff

# Sander Pool

# Frederik Rouleau

#

#----------------------------------------------------------------------------

# On command line:

#

# make all = Make software.

#

# make clean = Clean out built project files.

#

# make coff = Convert ELF to AVR COFF.

#

# make extcoff = Convert ELF to AVR Extended COFF.

#

# make program = Download the hex file to the device, using avrdude.

#                Please customize the avrdude settings below first!

#

# make debug = Start either simulavr or avarice as specified for debugging,

#              with avr-gdb or avr-insight as the front end for debugging.

#

# make filename.s = Just compile filename.c into the assembler code only.

#

# make filename.i = Create a preprocessed source file for use in submitting

#                   bug reports to the GCC project.

#

# To rebuild project do "make clean" then "make all".

#----------------------------------------------------------------------------

# MCU name

MCU = attiny2313

# Processor frequency.

#     This will define a symbol, F_CPU, in all source code files equal to the

#     processor frequency. You can then use this symbol in your source code to

#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done

#     automatically to create a 32-bit value in your source code.

F_CPU = 8000000

# Output format. (can be srec, ihex, binary)

FORMAT = ihex

# Target file name (without extension).

TARGET = main

# List C source files here. (C dependencies are automatically generated.)

#SRC =  $(wildcard *.c)

SRC = main.c uart.c USI_UART.c

# List Assembler source files here.

#     Make them always end in a capital .S.  Files ending in a lowercase .s

#     will not be considered source files but generated files (assembler

#     output from the compiler), and will be deleted upon "make clean"!

#     Even though the DOS/Win* filesystem matches both .s and .S the same,

#     it will preserve the spelling of the filenames, and gcc itself does

#     care about how the name is spelled on its command-line.

ASRC =

# Optimization level, can be [0, 1, 2, 3, s].

#     0 = turn off optimization. s = optimize for size.

#     (Note: 3 is not always the best optimization level. See avr-libc FAQ.)

OPT = s

# Debugging format.

#     Native formats for AVR-GCC's -g are dwarf-2 [default] or stabs.

#     AVR Studio 4.10 requires dwarf-2.

#     AVR [Extended] COFF format requires stabs, plus an avr-objcopy run.

DEBUG =

# List any extra directories to look for include files here.

#     Each directory must be seperated by a space.

#     Use forward slashes for directory separators.

#     For a directory that has spaces, enclose it in quotes.

#EXTRAINCDIRS = C:\WinAVR\include\fwr

# Compiler flag to set the C Standard level.

#     c89   = "ANSI" C

#     gnu89 = c89 plus GCC extensions

#     c99   = ISO C99 standard (not yet fully implemented)

#     gnu99 = c99 plus GCC extensions

CSTANDARD = -std=gnu99

# Place -D or -U options here

CDEFS = -DF_CPU=$(F_CPU)UL

# Place -I options here

CINCS =

#---------------- Compiler Options ----------------

#  -g*:          generate debugging information

#  -O*:          optimization level

#  -f...:        tuning, see GCC manual and avr-libc documentation

#  -Wall...:     warning level

#  -Wa,...:      tell GCC to pass this to the assembler.

#    -adhlns...: create assembler listing

#CFLAGS = -g$(DEBUG)

CFLAGS += $(CDEFS) $(CINCS)

CFLAGS += -O$(OPT)

CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums

CFLAGS += -Wall -Wstrict-prototypes

CFLAGS += -Wa,-adhlns=$(<:.c=.lst)

CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))

CFLAGS += $(CSTANDARD)

#---------------- Assembler Options ----------------

#  -Wa,...:   tell GCC to pass this to the assembler.

#  -ahlms:    create listing

#  -gstabs:   have the assembler create line number information; note that

#             for use in COFF files, additional information about filenames

#             and function names needs to be present in the assembler source

#             files -- see avr-libc docs [FIXME: not yet described there]

ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs

#---------------- Library Options ----------------

# Minimalistic printf version

PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min

# Floating point printf version (requires MATH_LIB = -lm below)

PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt

# If this is left blank, then it will use the Standard printf version.

PRINTF_LIB =

#PRINTF_LIB = $(PRINTF_LIB_MIN)

#PRINTF_LIB = $(PRINTF_LIB_FLOAT)

# Minimalistic scanf version

SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min

# Floating point + %[ scanf version (requires MATH_LIB = -lm below)

SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt

# If this is left blank, then it will use the Standard scanf version.

SCANF_LIB =

#SCANF_LIB = $(SCANF_LIB_MIN)

#SCANF_LIB = $(SCANF_LIB_FLOAT)

MATH_LIB = -lm

#---------------- External Memory Options ----------------

# 64 KB of external RAM, starting after internal RAM (ATmega128!),

# used for variables (.data/.bss) and heap (malloc()).

#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff

# 64 KB of external RAM, starting after internal RAM (ATmega128!),

# only used for heap (malloc()).

#EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff

EXTMEMOPTS =

#---------------- Linker Options ----------------

#  -Wl,...:     tell GCC to pass this to linker.

#    -Map:      create map file

#    --cref:    add cross reference to  map file

LDFLAGS = -Wl,-Map=$(TARGET).map,--cref

LDFLAGS += $(EXTMEMOPTS)

LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)

#---------------- Programming Options (avrdude) ----------------

# Programming hardware: alf avr910 avrisp bascom bsd

# dt006 pavr picoweb pony-stk200 sp12 stk200 stk500

#

# Type: avrdude -c ?

# to get a full listing.

#

AVRDUDE_PROGRAMMER = avrispmkII

# com1 = serial port. Use lpt1 to connect to parallel port.

AVRDUDE_PORT = usb

# programmer connected to serial device

AVRDUDE_WRITE_FLASH = -b 19200 -U flash:w:$(TARGET).hex #speed was 4800

#AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep

# Uncomment the following if you want avrdude's erase cycle counter.

# Note that this counter needs to be initialized first using -Yn,

# see avrdude manual.

#AVRDUDE_ERASE_COUNTER = -y

# Uncomment the following if you do /not/ wish a verification to be

# performed after programming the device.

#AVRDUDE_NO_VERIFY = -V

# Increase verbosity level.  Please use this when submitting bug

# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude>

# to submit bug reports.

#AVRDUDE_VERBOSE = -v -v

AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER) -F

AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)

AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)

AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)

#---------------- Debugging Options ----------------

# For simulavr only - target MCU frequency.

DEBUG_MFREQ = $(F_CPU)

# Set the DEBUG_UI to either gdb or insight.

# DEBUG_UI = gdb

DEBUG_UI = insight

# Set the debugging back-end to either avarice, simulavr.

DEBUG_BACKEND = avarice

#DEBUG_BACKEND = simulavr

# GDB Init Filename.

GDBINIT_FILE = __avr_gdbinit

# When using avarice settings for the JTAG

JTAG_DEV = /dev/com1

# Debugging port used to communicate between GDB / avarice / simulavr.

DEBUG_PORT = 4242

# Debugging host used to communicate between GDB / avarice / simulavr, normally

#     just set to localhost unless doing some sort of crazy debugging when

#     avarice is running on a different computer.

DEBUG_HOST = localhost

#============================================================================

# Define programs and commands.

SHELL = sh

CC = avr-gcc

OBJCOPY = avr-objcopy

OBJDUMP = avr-objdump

SIZE = avr-size

NM = avr-nm

AVRDUDE = avrdude

REMOVE = rm -f

COPY = cp

WINSHELL = cmd

# Define Messages

# English

MSG_ERRORS_NONE = Errors: none

MSG_BEGIN = -------- begin --------

MSG_END = --------  end  --------

MSG_SIZE_BEFORE = Size before:

MSG_SIZE_AFTER = Size after:

MSG_COFF = Converting to AVR COFF:

MSG_EXTENDED_COFF = Converting to AVR Extended COFF:

MSG_FLASH = Creating load file for Flash:

MSG_EEPROM = Creating load file for EEPROM:

MSG_EXTENDED_LISTING = Creating Extended Listing:

MSG_SYMBOL_TABLE = Creating Symbol Table:

MSG_LINKING = Linking:

MSG_COMPILING = Compiling:

MSG_ASSEMBLING = Assembling:

MSG_CLEANING = Cleaning project:

# Define all object files.

OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)

# Define all listing files.

LST = $(SRC:.c=.lst) $(ASRC:.S=.lst)

# Compiler flags to generate dependency files.

GENDEPFLAGS = -MD -MP -MF .dep/$(@F).d