Started following some tutorial on att85 usi. Downloaded example code from make avr book.
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Dan
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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 +1,68 @@
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/*
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Press the button as quickly as you can after the LEDs light up.
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Your time is printed out over the serial port.
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*/
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// ------- Preamble -------- //
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/interrupt.h>
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#include "pinDefines.h"
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#include "USART.h"
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#include "support.h"
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static inline void initTimer1(void) {
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/* Normal mode (default), just counting */
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TCCR1B |= (1 << CS11) | (1 << CS10);
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/* Clock speed: 1 MHz / 64,
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each tick is 64 microseconds ~= 15.6 per ms */
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/* No special output modes */
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}
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int main(void) {
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uint16_t timerValue;
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// -------- Inits --------- //
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initUSART();
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initTimer1();
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LED_DDR = 0xff; /* all LEDs for output */
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BUTTON_PORT |= (1 << BUTTON); /* enable internal pull-up */
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printString("\r\nReaction Timer:\r\n");
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printString("---------------\r\n");
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printString("Press any key to start.\r\n");
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// ------ Event loop ------ //
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while (1) {
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receiveByte(); /* press any key */
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printString("\r\nGet ready...");
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randomDelay();
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printString("\r\nGo!\r\n");
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LED_PORT = 0xff; /* light LEDs */
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TCNT1 = 0; /* reset counter */
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if (bit_is_clear(BUTTON_PIN, BUTTON)) {
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/* Button pressed _exactly_ as LEDs light up. Suspicious. */
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printString("You're only cheating yourself.\r\n");
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}
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else {
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// Wait until button pressed, save timer value.
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loop_until_bit_is_clear(BUTTON_PIN, BUTTON);
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timerValue = TCNT1 >> 4;
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/* each tick is approx 1/16 milliseconds, so we bit-shift divide */
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printMilliseconds(timerValue);
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printComments(timerValue);
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}
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// Clear LEDs and start again.
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LED_PORT = 0x00;
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printString("Press any key to try again.\r\n");
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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 +1,92 @@
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#include "support.h"
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void printMilliseconds(uint16_t value) {
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/* Given a value in milliseconds, prints out how many seconds
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you took over the serial port. Does ascii conversion, prints
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decimal point, and drops extra leading zeros.
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*/
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uint8_t digit;
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printString("\r\nYou took ");
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/* add up ten-thousands */
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digit = 0;
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while (value >= 10000) {
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digit++;
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value -= 10000;
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}
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if (digit) {
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transmitByte('0' + digit);
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}
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/* add up thousands */
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digit = 0;
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while (value >= 1000) {
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digit++;
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value -= 1000;
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}
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transmitByte('0' + digit);
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/* decimal point here b/c dividing by 1000 */
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transmitByte('.');
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/* add up hundreds */
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digit = 0;
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while (value >= 100) {
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digit++;
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value -= 100;
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}
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transmitByte('0' + digit);
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/* add up tens */
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digit = 0;
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while (value >= 10) {
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digit++;
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value -= 10;
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}
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transmitByte('0' + digit);
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// Ones digit is easy.
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transmitByte('0' + value);
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printString(" seconds.\r\n");
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}
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void printComments(uint16_t value) {
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/* Given a value in milliseconds, rates your reaction time */
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if (value > 2000) {
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printString("----> Ummm...this is a reaction timer...\r\n");
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}
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else if (value > 1000) {
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printString("----> Hello?\r\n");
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}
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else if (value > 500) {
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printString("----> Slow.\r\n");
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}
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else if (value > 250) {
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printString("----> Have another cup of coffee.\r\n");
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}
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else if (value > 200) {
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printString("----> Respectable.\r\n");
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}
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else if (value >= 150) {
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printString("----> Fast.\r\n");
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}
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else if (value < 150) {
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printString("----> Amazing!\r\n");
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}
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}
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void randomDelay(void) {
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/* Waits for a "random" delay from 1 - 3.5 sec */
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/* Requires timer 1 initialized and running */
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/* It's not really random, but very hard to control --
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like coin-flipping. */
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uint8_t randomTime;
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_delay_ms(1000); /* wait at least 1 sec */
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randomTime = (uint8_t) TCNT1;
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/* type-casting the 16-bit TCNT1 as an 8-bit number keeps
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only the 8 least-significant (fastest-changing) bits */
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while (--randomTime) {
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_delay_ms(10); /* max value is 255 ~= 2.5 sec */
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}
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}
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@@ -0,0 +1,24 @@
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/* Support functions that otherwise make the main code more readable */
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/* Includes */
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#include <util/delay.h>
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#include <avr/io.h>
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#include "USART.h"
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/* Function Prototypes in support.c */
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void printMilliseconds(uint16_t value);
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/* Given a value in milliseconds, prints out how many seconds
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you took over the serial port. Does ascii conversion, prints
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decimal point, and drops extra leading zeros.
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*/
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void printComments(uint16_t value);
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/* Given a value in milliseconds, rates your reaction time */
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void randomDelay(void);
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/* Waits for a "random" delay from 1 - 3.5 sec */
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/* Requires timer 1 initialized and running */
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/* It's not really random, but very hard to control
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like coin-flipping. */
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Reference in New Issue
Block a user