Started following some tutorial on att85 usi. Downloaded example code from make avr book.
This commit is contained in:
Dan
1
Make AVR Examples/Chapter19_EEPROM/vigenereCipher/.gitignore
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1
Make AVR Examples/Chapter19_EEPROM/vigenereCipher/.gitignore
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vigenereCipher.eeprom
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196
Make AVR Examples/Chapter19_EEPROM/vigenereCipher/Makefile
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Make AVR Examples/Chapter19_EEPROM/vigenereCipher/Makefile
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##########------------------------------------------------------##########
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########## Project-specific Details ##########
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########## Check these every time you start a new project ##########
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##########------------------------------------------------------##########
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MCU = atmega168p
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F_CPU = 1000000UL
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BAUD = 9600UL
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## Also try BAUD = 19200 or 38400 if you're feeling lucky.
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## A directory for common include files and the simple USART library.
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## If you move either the current folder or the Library folder, you'll
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## need to change this path to match.
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LIBDIR = ../../AVR-Programming-Library
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##########------------------------------------------------------##########
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########## Programmer Defaults ##########
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########## Set up once, then forget about it ##########
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########## (Can override. See bottom of file.) ##########
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##########------------------------------------------------------##########
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PROGRAMMER_TYPE = usbtiny
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# extra arguments to avrdude: baud rate, chip type, -F flag, etc.
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PROGRAMMER_ARGS =
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##########------------------------------------------------------##########
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########## Program Locations ##########
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########## Won't need to change if they're in your PATH ##########
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##########------------------------------------------------------##########
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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AVRSIZE = avr-size
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AVRDUDE = avrdude
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##########------------------------------------------------------##########
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########## Makefile Magic! ##########
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########## Summary: ##########
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########## We want a .hex file ##########
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########## Compile source files into .elf ##########
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########## Convert .elf file into .hex ##########
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########## You shouldn't need to edit below. ##########
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##########------------------------------------------------------##########
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## The name of your project (without the .c)
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# TARGET = blinkLED
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## Or name it automatically after the enclosing directory
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TARGET = $(lastword $(subst /, ,$(CURDIR)))
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# Object files: will find all .c/.h files in current directory
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# and in LIBDIR. If you have any other (sub-)directories with code,
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# you can add them in to SOURCES below in the wildcard statement.
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SOURCES=$(wildcard *.c $(LIBDIR)/*.c)
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OBJECTS=$(SOURCES:.c=.o)
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HEADERS=$(SOURCES:.c=.h)
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## Compilation options, type man avr-gcc if you're curious.
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CPPFLAGS = -DF_CPU=$(F_CPU) -DBAUD=$(BAUD) -I. -I$(LIBDIR)
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CFLAGS = -Os -g -std=gnu99 -Wall
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## Use short (8-bit) data types
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CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
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## Splits up object files per function
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CFLAGS += -ffunction-sections -fdata-sections
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LDFLAGS = -Wl,-Map,$(TARGET).map
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## Optional, but often ends up with smaller code
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LDFLAGS += -Wl,--gc-sections
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## Relax shrinks code even more, but makes disassembly messy
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## LDFLAGS += -Wl,--relax
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## LDFLAGS += -Wl,-u,vfprintf -lprintf_flt -lm ## for floating-point printf
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## LDFLAGS += -Wl,-u,vfprintf -lprintf_min ## for smaller printf
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TARGET_ARCH = -mmcu=$(MCU)
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## Explicit pattern rules:
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## To make .o files from .c files
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%.o: %.c $(HEADERS) Makefile
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$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -o $@ $<;
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$(TARGET).elf: $(OBJECTS)
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$(CC) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) -o $@
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%.hex: %.elf
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$(OBJCOPY) -j .text -j .data -O ihex $< $@
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%.eeprom: %.elf
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$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
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%.lst: %.elf
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$(OBJDUMP) -S $< > $@
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## These targets don't have files named after them
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.PHONY: all disassemble disasm eeprom size clean squeaky_clean flash fuses
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all: $(TARGET).hex
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debug:
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@echo
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@echo "Source files:" $(SOURCES)
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@echo "MCU, F_CPU, BAUD:" $(MCU), $(F_CPU), $(BAUD)
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@echo
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# Optionally create listing file from .elf
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# This creates approximate assembly-language equivalent of your code.
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# Useful for debugging time-sensitive bits,
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# or making sure the compiler does what you want.
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disassemble: $(TARGET).lst
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disasm: disassemble
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# Optionally show how big the resulting program is
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size: $(TARGET).elf
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$(AVRSIZE) -C --mcu=$(MCU) $(TARGET).elf
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clean:
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rm -f $(TARGET).elf $(TARGET).hex $(TARGET).obj \
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$(TARGET).o $(TARGET).d $(TARGET).eep $(TARGET).lst \
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$(TARGET).lss $(TARGET).sym $(TARGET).map $(TARGET)~ \
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$(TARGET).eeprom
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squeaky_clean:
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rm -f *.elf *.hex *.obj *.o *.d *.eep *.lst *.lss *.sym *.map *~ *.eeprom
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##########------------------------------------------------------##########
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########## Programmer-specific details ##########
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########## Flashing code to AVR using avrdude ##########
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##########------------------------------------------------------##########
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flash: $(TARGET).hex
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U flash:w:$<
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## An alias
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program: flash
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flash_eeprom: $(TARGET).eeprom
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U eeprom:w:$<
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avrdude_terminal:
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nt
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## If you've got multiple programmers that you use,
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## you can define them here so that it's easy to switch.
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## To invoke, use something like `make flash_arduinoISP`
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flash_usbtiny: PROGRAMMER_TYPE = usbtiny
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flash_usbtiny: PROGRAMMER_ARGS = # USBTiny works with no further arguments
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flash_usbtiny: flash
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flash_usbasp: PROGRAMMER_TYPE = usbasp
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flash_usbasp: PROGRAMMER_ARGS = # USBasp works with no further arguments
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flash_usbasp: flash
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flash_arduinoISP: PROGRAMMER_TYPE = avrisp
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flash_arduinoISP: PROGRAMMER_ARGS = -b 19200 -P /dev/ttyACM0
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## (for windows) flash_arduinoISP: PROGRAMMER_ARGS = -b 19200 -P com5
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flash_arduinoISP: flash
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flash_109: PROGRAMMER_TYPE = avr109
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flash_109: PROGRAMMER_ARGS = -b 9600 -P /dev/ttyUSB0
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flash_109: flash
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##########------------------------------------------------------##########
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########## Fuse settings and suitable defaults ##########
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##########------------------------------------------------------##########
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## Mega 48, 88, 168, 328 default values
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LFUSE = 0x62
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HFUSE = 0xdf
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EFUSE = 0x00
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## Generic
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FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
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fuses:
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) \
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$(PROGRAMMER_ARGS) $(FUSE_STRING)
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show_fuses:
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nv
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## Called with no extra definitions, sets to defaults
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set_default_fuses: FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
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set_default_fuses: fuses
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## Set the fuse byte for full-speed mode
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## Note: can also be set in firmware for modern chips
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set_fast_fuse: LFUSE = 0xE2
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set_fast_fuse: FUSE_STRING = -U lfuse:w:$(LFUSE):m
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set_fast_fuse: fuses
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## Set the EESAVE fuse byte to preserve EEPROM across flashes
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set_eeprom_save_fuse: HFUSE = 0xD7
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set_eeprom_save_fuse: FUSE_STRING = -U hfuse:w:$(HFUSE):m
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set_eeprom_save_fuse: fuses
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## Clear the EESAVE fuse byte
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clear_eeprom_save_fuse: FUSE_STRING = -U hfuse:w:$(HFUSE):m
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clear_eeprom_save_fuse: fuses
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@@ -0,0 +1,146 @@
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/*
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Vigenere Cipher encoder / decoder demo
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And an excuse to play around with EEPROM memory
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*/
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#include "vigenereCipher.h"
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// -------- Functions --------- //
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void printFromEEPROM(char *eepromString) {
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uint8_t letter;
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do {
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letter = eeprom_read_byte((uint8_t *) eepromString);
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transmitByte(letter);
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eepromString++;
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} while (letter);
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}
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void enterText(char text[]) {
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uint8_t i = 0;
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char letter;
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do {
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letter = receiveByte();
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transmitByte(letter); /* echo */
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text[i] = letter;
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i++;
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} while (!(letter == '\r') && (i < (MAX_TEXT_LENGTH - 1)));
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text[i - 1] = 0;
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}
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void displayCodes(void) {
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uint8_t i;
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for (i = 0; i < 4; i++) {
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transmitByte(' ');
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transmitByte('0' + i);
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printString(": ");
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printFromEEPROM(codePointers[i]);
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printString("\r\n");
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}
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}
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void changeCode(char codeBuffer[]) {
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char input;
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char *codeAddress;
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printString(" -- Choose code phrase to replace:\r\n");
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do {
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displayCodes();
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input = receiveByte();
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} while ((input < '0') || (input > '3'));
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codeAddress = codePointers[input - '0'];
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printString(" -- Enter new code: ");
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enterText(codeBuffer);
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eeprom_update_block(codeBuffer, codeAddress, CODE_LEN);
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}
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void selectCode(char code[]) {
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char input;
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char *codeAddress;
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printFromEEPROM(promptSelectCode);
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do {
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displayCodes();
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input = receiveByte();
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} while ((input < '0') || (input > '3'));
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codeAddress = codePointers[input - '0'];
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eeprom_read_block(code, codeAddress, CODE_LEN);
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}
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void encodeVigenere(char text[], char code[]) {
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uint8_t codePosition = 0;
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uint8_t textPosition = 0;
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do {
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if (code[codePosition] == 0) { /* loop when at end of code phrase */
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codePosition = 0;
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}
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text[textPosition] += code[codePosition] - 32;
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if (text[textPosition] > 126) {
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text[textPosition] -= 95;
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} /* keeps within printing characters */
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codePosition++; /* and move on to the next */
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textPosition++;
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} while (text[textPosition]); /* until zero at the end of string */
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}
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void decodeVigenere(char text[], char code[]) {
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uint8_t codePosition = 0;
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uint8_t textPosition = 0;
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do {
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if (code[codePosition] == 0) {
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codePosition = 0;
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}
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if (code[codePosition] > text[textPosition]) {
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text[textPosition] += 95;
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} /* keeps within printing characters */
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text[textPosition] -= code[codePosition] - 32;
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codePosition++;
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textPosition++;
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} while (text[textPosition]);
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}
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int main(void) {
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// -------- Inits --------- //
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char textBuffer[MAX_TEXT_LENGTH];
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char codeString[CODE_LEN];
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char input;
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initUSART();
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// ------ Event loop ------ //
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while (1) {
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// Menu
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printFromEEPROM(welcomeString);
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printFromEEPROM(promptText);
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printString(textBuffer);
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printString("\r\n");
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printFromEEPROM(promptCode);
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printString(codeString);
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printString("\r\n\r\n ---------------------\r\n");
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printFromEEPROM(menuEnterText);
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printFromEEPROM(menuCodeText);
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printFromEEPROM(menuChangeCode);
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printFromEEPROM(menuEncode);
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printFromEEPROM(menuDecode);
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input = receiveByte();
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switch (input) {
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case 'e': // encode
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encodeVigenere(textBuffer, codeString);
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break;
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case 'd': // decode
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decodeVigenere(textBuffer, codeString);
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break;
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case 'n': // new text
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printFromEEPROM(promptTypeText);
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enterText(textBuffer);
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break;
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case 'c': // choose code
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selectCode(codeString);
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break;
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case 'x': // change code
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changeCode(codeString);
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break;
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}
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} /* End event loop */
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return 0; /* This line is never reached */
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}
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@@ -0,0 +1,55 @@
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/*
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Vigenere Cipher encoder / decoder demo
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And an excuse to play around with EEPROM memory
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*/
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#include "vigenereCipher.h"
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// -------- Functions --------- //
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void printFromEEPROM(char *eepromString);
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void enterText(char text[]);
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void displayCodes(void);
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void changeCode(char codeBuffer[]);
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void selectCode(char code[]);
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void encodeVigenere(char text[], char code[]);
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void decodeVigenere(char text[], char code[]);
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int main(void) {
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// -------- Inits --------- //
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char textBuffer[MAX_TEXT_LENGTH];
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char codeString[CODE_LEN];
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char input;
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initUSART();
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// ------ Event loop ------ //
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while (1) {
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// Menu
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printFromEEPROM(welcomeString);
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// .... more fany menu printing
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printFromEEPROM(menuDecode);
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input = receiveByte();
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switch (input) {
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case 'e': // encode
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encodeVigenere(textBuffer, codeString);
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break;
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case 'd': // decode
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decodeVigenere(textBuffer, codeString);
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break;
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case 'n': // new text
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printFromEEPROM(promptTypeText);
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enterText(textBuffer);
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break;
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case 'c': // choose code
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selectCode(codeString);
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break;
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case 'x': // change code
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changeCode(codeString);
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break;
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}
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} /* End event loop */
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return (0); /* This line is never reached */
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}
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@@ -0,0 +1,50 @@
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#include <avr/io.h>
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#include <avr/eeprom.h>
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#include "USART.h"
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#define MAX_TEXT_LENGTH 256
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#define CODE_LEN 64
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// -------- Global Variables --------- //
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char EEMEM code0[CODE_LEN] = "ettubrute";
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char EEMEM code1[CODE_LEN] = "attackatdawn";
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char EEMEM code2[CODE_LEN] = "theraininspainfallsmainlyontheplain";
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char EEMEM code3[CODE_LEN] = "ablewasiereisawelba";
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char *codePointers[] = { code0, code1, code2, code3 };
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// Menu strings. Why not store them in EEPROM?
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char EEMEM welcomeString[] = "\r\n--== Vigenere Cipher ==--\r\n";
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char EEMEM menuEncode[] = " [e] to encode text\r\n";
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char EEMEM menuDecode[] = " [d] to decode text\r\n\r\n";
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char EEMEM menuEnterText[] = " [n] to enter new text\r\n";
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char EEMEM menuCodeText[] = " [c] to select your code phrase\r\n";
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char EEMEM menuChangeCode[] = " [x] to modify code phrases\r\n";
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char EEMEM promptCode[] = "code: ";
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char EEMEM promptText[] = "\r\ntext: ";
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char EEMEM promptSelectCode[] = "Select codephrase:\r\n\r\n";
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char EEMEM promptTypeText[] = "Type your text: ";
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// Given the address of an EEPROM string, prints it out
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// Used for menu items
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void printFromEEPROM(char *eepromString);
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// Takes input from serial, stores it in the text array
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void enterText(char text[]);
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// Reads code phrases out of EEPROM and prints them.
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// Uses the codeBuffer for temporary storage
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void displayCodes(void);
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// Changes a code phrase, both in EEPROM and the current code
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void changeCode(char codeBuffer[]);
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// Pick a code phrase from EEPROM
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void selectCode(char code[]);
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// Encodes the passed text string, in place
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void encodeVigenere(char text[], char code[]);
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// Decodes the passed text string, in place
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void decodeVigenere(char text[], char code[]);
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