Miscellaneous test code

5 files changed, 842 insertions, 48 deletions

diff --git a/Makefile b/Makefile
index b7690cd..8a8d9ff 100644
--- a/Makefile
+++ b/Makefile
@@ -1,41 +1,636 @@
-MCU=atmega32
-AVRDUDE=avrdude
-ACC=avr-gcc
-AOBJCOPY=avr-objcopy
-ALD=avr-ld
-ASIZE=avr-size
-CFLAGS=-Wall -Wextra -Wno-unused-parameter -pedantic -std=c99
-
-ACFLAGS=-g -mmcu=$(MCU) $(CFLAGS) $(DPIN) -Os -mcall-prologues
-# ALDFLAGS=-L/usr/avr/lib/avr4 -L/usr/lib/binutils/avr/2.18
-LD=gcc
-CC=gcc
-CXX=g++ -g
-LDXX=g++ -g
-
-love: ferment.flash ferment.eeprom
-
-%.flash: %.ld.o
-	$(AOBJCOPY) -O binary $< $@
-
-%.eeprom: %.ld.o
-	$(AOBJCOPY) -j .eeprom -O binary $^ $@
-
-%.ld.o: %.o
-	$(ACC) $(ACFLAGS) $(ALDFLAGS) -Wl,-Map,$(patsubst %.ld.o,%.map,$@) -o $@ $<
-	@$(ASIZE) $@
-
-%.o: %.c
-	$(ACC) $(ACFLAGS) -c -o $@ $<
-
-flash: ferment.flash
-	$(AVRDUDE) -y -p m32 -E noreset -U flash:w:$<:r
-eeprom: ferment.eeprom
-	$(AVRDUDE) -y -p m32 -E noreset -U eeprom:w:$<:r
-
-clean:
-	rm -f *.flash *.eeprom *.o
-
-.PHONY: love flash eeprom clean
-.SECONDARY:
+# 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
+# Carlos Lamas
+#
+#----------------------------------------------------------------------------
+# 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 = atmega644p
+MCU = atmega32
+#MCU = atmega16
+#MCU = atmega168
+
+# 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.
+#     Typical values are:
+#         F_CPU =  1000000
+#         F_CPU =  1843200
+#         F_CPU =  2000000
+#         F_CPU =  3686400
+#         F_CPU =  4000000
+         F_CPU =  7372800
+#         F_CPU =  8000000
+#         F_CPU = 11059200
+#         F_CPU = 12000000
+#         F_CPU = 14745600
+#         F_CPU = 16000000
+#         F_CPU = 18432000
+#         F_CPU = 20000000
+#F_CPU = 0
+
+
+# Output format. (can be srec, ihex, binary)
+FORMAT = ihex
+
+
+# Target file name (without extension).
+TARGET = ferment
+
+
+# Object files directory
+#     To put object files in current directory, use a dot (.), do NOT make
+#     this an empty or blank macro!
+OBJDIR = .
+
+
+# List C source files here. (C dependencies are automatically generated.)
+SRC = $(wildcard *.c)
+
+
+# List C++ source files here. (C dependencies are automatically generated.)
+CPPSRC = 
+
+
+# List Assembler source files here.
+#     Make them always end in a capital .S.  Files ending in a lowercase .s
+#     will not be considered source files but generated files (assembler
+#     output from the compiler), and will be deleted upon "make clean"!
+#     Even though the DOS/Win* filesystem matches both .s and .S the same,
+#     it will preserve the spelling of the filenames, and gcc itself does
+#     care about how the name is spelled on its command-line.
+ASRC =
+
+
+# Optimization level, can be [0, 1, 2, 3, s]. 
+#     0 = turn off optimization. s = optimize for size.
+#     (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
+OPT = 2
+
+
+# Debugging format.
+#     Native formats for AVR-GCC's -g are dwarf-2 [default] or stabs.
+#     AVR Studio 4.10 requires dwarf-2.
+#     AVR [Extended] COFF format requires stabs, plus an avr-objcopy run.
+DEBUG = stabs
+
+
+# List any extra directories to look for include files here.
+#     Each directory must be seperated by a space.
+#     Use forward slashes for directory separators.
+#     For a directory that has spaces, enclose it in quotes.
+EXTRAINCDIRS = 
+
+
+# Compiler flag to set the C Standard level.
+#     c89   = "ANSI" C
+#     gnu89 = c89 plus GCC extensions
+#     c99   = ISO C99 standard (not yet fully implemented)
+#     gnu99 = c99 plus GCC extensions
+CSTANDARD = -std=c99
+
+
+# Place -D or -U options here for C sources
+CDEFS = -DF_CPU=$(F_CPU)UL
+
+# Place -D or -U options here for C++ sources
+#CPPDEFS = -DF_CPU=$(F_CPU)UL
+#CPPDEFS += -D__STDC_LIMIT_MACROS
+#CPPDEFS += -D__STDC_CONSTANT_MACROS
+
+
+
+#---------------- Compiler Options C ----------------
+#  -g*:          generate debugging information
+#  -O*:          optimization level
+#  -f...:        tuning, see GCC manual and avr-libc documentation
+#  -Wall...:     warning level
+#  -Wa,...:      tell GCC to pass this to the assembler.
+#    -adhlns...: create assembler listing
+CFLAGS = -g$(DEBUG)
+CFLAGS += $(CDEFS)
+CFLAGS += -O$(OPT)
+CFLAGS += -funsigned-char
+CFLAGS += -funsigned-bitfields
+CFLAGS += -fpack-struct
+CFLAGS += -fshort-enums
+CFLAGS += -Wall
+CFLAGS += -Wstrict-prototypes
+#CFLAGS += -Werror
+CFLAGS += -pedantic
+#CFLAGS += -mshort-calls
+#CFLAGS += -fno-unit-at-a-time
+#CFLAGS += -Wundef
+#CFLAGS += -Wunreachable-code
+#CFLAGS += -Wsign-compare
+CFLAGS += -Wa,-adhlns=$(<:%.c=$(OBJDIR)/%.lst)
+CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
+CFLAGS += $(CSTANDARD)
+#CFLAGS += -ffunction-sections
+
+
+#---------------- Compiler Options C++ ----------------
+#  -g*:          generate debugging information
+#  -O*:          optimization level
+#  -f...:        tuning, see GCC manual and avr-libc documentation
+#  -Wall...:     warning level
+#  -Wa,...:      tell GCC to pass this to the assembler.
+#    -adhlns...: create assembler listing
+CPPFLAGS = -g$(DEBUG)
+CPPFLAGS += $(CPPDEFS)
+CPPFLAGS += -O$(OPT)
+CPPFLAGS += -funsigned-char
+CPPFLAGS += -funsigned-bitfields
+CPPFLAGS += -fpack-struct
+CPPFLAGS += -fshort-enums
+CPPFLAGS += -fno-exceptions
+CPPFLAGS += -Wall
+CFLAGS += -Wundef
+#CPPFLAGS += -mshort-calls
+#CPPFLAGS += -fno-unit-at-a-time
+#CPPFLAGS += -Wstrict-prototypes
+#CPPFLAGS += -Wunreachable-code
+#CPPFLAGS += -Wsign-compare
+CPPFLAGS += -Wa,-adhlns=$(<:%.cpp=$(OBJDIR)/%.lst)
+CPPFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
+#CPPFLAGS += $(CSTANDARD)
+
+
+#---------------- Assembler Options ----------------
+#  -Wa,...:   tell GCC to pass this to the assembler.
+#  -ahlms:    create listing
+#  -gstabs:   have the assembler create line number information; note that
+#             for use in COFF files, additional information about filenames
+#             and function names needs to be present in the assembler source
+#             files -- see avr-libc docs [FIXME: not yet described there]
+#  -listing-cont-lines: Sets the maximum number of continuation lines of hex 
+#       dump that will be displayed for a given single line of source input.
+ASFLAGS = -Wa,-adhlns=$(<:.S=$(OBJDIR)/%.lst),-gstabs,--listing-cont-lines=100
+
+
+#---------------- 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 = $(SCANF_LIB_FLOAT)
+
+
+MATH_LIB = -lm
+
+
+# List any extra directories to look for libraries here.
+#     Each directory must be seperated by a space.
+#     Use forward slashes for directory separators.
+#     For a directory that has spaces, enclose it in quotes.
+EXTRALIBDIRS = 
+
+
+
+#---------------- External Memory Options ----------------
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# used for variables (.data/.bss) and heap (malloc()).
+#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# only used for heap (malloc()).
+#EXTMEMOPTS = -Wl,--section-start,.data=0x801100,--defsym=__heap_end=0x80ffff
+
+EXTMEMOPTS =
+
+
+
+#---------------- Linker Options ----------------
+#  -Wl,...:     tell GCC to pass this to linker.
+#    -Map:      create map file
+#    --cref:    add cross reference to  map file
+LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
+LDFLAGS += $(EXTMEMOPTS)
+LDFLAGS += $(patsubst %,-L%,$(EXTRALIBDIRS))
+LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
+#LDFLAGS += -T linker_script.x
+#LDFLAGS += -ffunction-sections -Wl,--gc-sections
+
+
+#---------------- Programming Options (avrdude) ----------------
+
+# Programming hardware: alf avr910 avrisp bascom bsd 
+# dt006 pavr picoweb pony-stk200 sp12 stk200 stk500
+#
+# Type: avrdude -c ?
+# to get a full listing.
+#
+AVRDUDE_PROGRAMMER = stk500v2 -P avrdoper
+#AVRDUDE_PROGRAMMER = avr910
+# com1 = serial port. Use lpt1 to connect to parallel port.
+#AVRDUDE_PORT = /dev/ttyUSB0
+
+AVRDUDE_WRITE_FLASH = -B 10 -U flash:w:$(TARGET).hex
+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 m32 -E noreset
+
+ifdef AVRDUDE_PROGRAMMER
+AVRDUDE_FLAGS += -c $(AVRDUDE_PROGRAMMER)
+endif
+
+AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)
+AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)
+AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)
+
+#Full swing crystal oscillator
+AVRDUDE_LFUSE_FLAGS = #-B 100 -U lfuse:w:0xe4:m
+#preserve eeprom, max boot section
+AVRDUDE_HFUSE_FLAGS = #-B 100 -U hfuse:w:0xd9:m
+#2.7v brown out
+AVRDUDE_EFUSE_FLAGS = #-B 100 -U efuse:w:0xff:m
+
+#---------------- 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
+AR = avr-ar rcs
+NM = avr-nm
+AVRDUDE = avrdude
+REMOVE = rm -f
+REMOVEDIR = rm -rf
+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 C:
+MSG_COMPILING_CPP = Compiling C++:
+MSG_ASSEMBLING = Assembling:
+MSG_CLEANING = Cleaning project:
+MSG_CREATING_LIBRARY = Creating library:
+
+
+
+
+# Define all object files.
+OBJ = $(SRC:%.c=$(OBJDIR)/%.o) $(CPPSRC:%.cpp=$(OBJDIR)/%.o) $(ASRC:%.S=$(OBJDIR)/%.o) 
+
+# Define all listing files.
+LST = $(SRC:%.c=$(OBJDIR)/%.lst) $(CPPSRC:%.cpp=$(OBJDIR)/%.lst) $(ASRC:%.S=$(OBJDIR)/%.lst) 
+
+
+# Compiler flags to generate dependency files.
+GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d
+
+
+# Combine all necessary flags and optional flags.
+# Add target processor to flags.
+ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)
+ALL_CPPFLAGS = -mmcu=$(MCU) -I. -x c++ $(CPPFLAGS) $(GENDEPFLAGS)
+ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)
+
+
+
+
+
+# Default target.
+all: begin gccversion sizebefore build sizeafter end
+# Change the build target to build a HEX file or a library.
+build: elf hex eep lss sym
+#build: lib
+
+
+elf: $(TARGET).elf
+hex: $(TARGET).hex
+eep: $(TARGET).eep
+lss: $(TARGET).lss
+sym: $(TARGET).sym
+LIBNAME=lib$(TARGET).a
+lib: $(LIBNAME)
+
+
+
+# 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) --format=avr $(TARGET).elf
+ELFSIZE = $(SIZE) $(TARGET).elf
+sizebefore:
+	@if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); \
+	2>/dev/null; echo; fi
+
+sizeafter:
+	@if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); \
+	2>/dev/null; echo; fi
+
+
+
+# Display compiler version information.
+gccversion : 
+	@$(CC) --version
+
+fuse:
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_HFUSE_FLAGS)
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_LFUSE_FLAGS)
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_EFUSE_FLAGS)
+
+
+# Program the device.  
+program: $(TARGET).hex $(TARGET).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+
+program-flash: $(TARGET).hex $(TARGET).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)
+# Generate avr-gdb config/init file which does the following:
+#     define the reset signal, load the target file, connect to target, and set 
+#     a breakpoint at main().
+gdb-config: 
+	@$(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
+COFFCONVERT += --change-section-address .data-0x800000
+COFFCONVERT += --change-section-address .bss-0x800000
+COFFCONVERT += --change-section-address .noinit-0x800000
+COFFCONVERT += --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 --no-change-warnings -O $(FORMAT) $< $@ || exit 0
+
+# 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 $< > $@
+
+
+
+# Create library from object files.
+.SECONDARY : $(TARGET).a
+.PRECIOUS : $(OBJ)
+%.a: $(OBJ)
+	@echo
+	@echo $(MSG_CREATING_LIBRARY) $@
+	$(AR) $@ $(OBJ)
+
+
+# Link: create ELF output file from object files.
+.SECONDARY : $(TARGET).elf
+.PRECIOUS : $(OBJ)
+%.elf: $(OBJ)
+	@echo
+	@echo $(MSG_LINKING) $@
+	$(CC) $(ALL_CFLAGS) $^ --output $@ $(LDFLAGS)
+
+
+# Compile: create object files from C source files.
+$(OBJDIR)/%.o : %.c
+	@echo
+	@echo $(MSG_COMPILING) $<
+	$(CC) -c $(ALL_CFLAGS) $< -o $@ 
+
+
+# Compile: create object files from C++ source files.
+$(OBJDIR)/%.o : %.cpp
+	@echo
+	@echo $(MSG_COMPILING_CPP) $<
+	$(CC) -c $(ALL_CPPFLAGS) $< -o $@ 
+
+
+# Compile: create assembler files from C source files.
+%.s : %.c
+	$(CC) -S $(ALL_CFLAGS) $< -o $@
+
+
+# Compile: create assembler files from C++ source files.
+%.s : %.cpp
+	$(CC) -S $(ALL_CPPFLAGS) $< -o $@
+
+
+# Assemble: create object files from assembler source files.
+$(OBJDIR)/%.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) $(SRC:%.c=$(OBJDIR)/%.o)
+	$(REMOVE) $(SRC:%.c=$(OBJDIR)/%.lst)
+	$(REMOVE) $(SRC:.c=.s)
+	$(REMOVE) $(SRC:.c=.d)
+	$(REMOVE) $(SRC:.c=.i)
+	$(REMOVEDIR) .dep
+
+
+# Create object files directory
+$(shell mkdir $(OBJDIR) 2>/dev/null)
+
+
+# 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 program-flash debug gdb-config
+
 
diff --git a/command.c b/command.c
new file mode 100644
index 0000000..41472c7
--- /dev/null
+++ b/command.c
@@ -0,0 +1,10 @@
+#include <avr/io.h>
+#include <stdint.h>
+
+#include "serial.h"
+
+uint16_t serial_rx_cb(char *buffer, uint16_t len)
+{
+	return 1;
+}
+
diff --git a/ferment.c b/ferment.c
index aba1916..b0d9a65 100644
--- a/ferment.c
+++ b/ferment.c
@@ -1,4 +1,4 @@
-#define F_CPU 1000000UL
+//#define F_CPU 7372800UL
 #include <stdint.h>
 #include <string.h>
 #include <avr/io.h>
@@ -8,6 +8,10 @@
 #include <avr/eeprom.h>
 #include <util/delay.h>
 
+#include "serial.h"
+#include "stdio.h"
+#include "pid.h"
+
 /* port D
  *
  *  4 1- (NMOS, inverted) 
@@ -22,6 +26,12 @@
 #define D_2_MINUS	(1 << 6)
 #define D_2_PLUS	(1 << 7)
 
+const int target_temp = 30;
+volatile uint16_t adc_res;
+volatile uint8_t adc_new;
+
+struct PID_DATA pid_data;
+
 /* Turns the H-bridge off, putting the output
  * into high impedance mode. */
 static void bridge_off(void)
@@ -55,15 +65,63 @@ static void bridge_init(void)
 	DDRD |= D_1_PLUS | D_1_MINUS | D_2_PLUS | D_2_MINUS;
 }
 
-int main()
+/* initializes ADC */
+static void adc_init(void)
+{
+	adc_new = 0;
+	ADMUX = (1 << REFS1) | (1 << REFS0);
+	/* select channel x (0 for now) */
+	ADMUX |= 0x0;
+	ADCSRA = (1 << ADEN) | (1 << ADIE) | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
+}
+
+/* reads ADC */
+static void start_temp_conv(void) 
+{
+	ADCSRA |= (1<<ADSC);
+}
+
+/* ADC completion interrupt */
+ISR(ADC_vect) 
+{
+	adc_res = ADCW;
+	adc_new = 1;
+}
+
+/* ADC results to temperature conversion routine */
+int adc_to_centigrade(uint16_t adc_val) {
+	return 0;
+}
+
+/* Initializes TIMER1 */
+static void timer_init(void) 
+{
+	TCCR1B = (1 << WGM12) | (1 << CS11);
+	OCR1A = 1000;
+	TIMSK|=(1<<OCIE1A);
+}
+
+ISR(TIMER1_COMPA_vect)
+{
+	serial_send("*\n", 2, 1);
+	start_temp_conv();
+}
+
+int main(void)
 {
+	char params[12];
+
+	serial_init();
+	adc_init();
+	timer_init();
 	bridge_init();
-	/* simple demo, just flips polarity every now and then */
+
+	sei();
+
 	while (1) {
-		bridge_on_a();
-		_delay_ms(200);
-		bridge_on_b();
-		_delay_ms(200);
+		sprintf(params, "%u\n", adc_res);
+		serial_send(params, strlen(params), 1);
+		//bridge_on_a();
+		_delay_ms(1000);
 	}
 }
-
diff --git a/serial.c b/serial.c
new file mode 100644
index 0000000..418a97d
--- /dev/null
+++ b/serial.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2012 (C) Christian Franke <nobody at nowhere dot ws>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with This program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#define BAUD 38400
+
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <util/setbaud.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "serial.h"
+
+
+static char output_buffer[512];
+static uint16_t output_offset = 0;
+static uint16_t output_end = 0;
+
+static char input_buffer[512];
+static uint16_t input_end = 0;
+
+static uint8_t verbose = 0;
+
+void serial_send(const char *buffer, uint16_t len, uint8_t urgent)
+{
+	if (!urgent && !verbose)
+		return;
+
+	cli();
+
+	if (sizeof(output_buffer) - output_end < len) {
+		memmove(output_buffer, output_buffer + output_offset, output_end -
+				output_offset);
+		output_end -= output_offset;
+		output_offset = 0;
+	}
+
+	uint16_t size = len;
+
+	if (size > sizeof(output_buffer) - output_end)
+		size = sizeof(output_buffer) - output_end;
+
+	memcpy(&output_buffer[output_end], buffer, size);
+
+	uint8_t send_needed = output_end == output_offset;
+
+	output_end += size;
+	sei();
+
+	if (send_needed) {
+		output_offset++;
+		UDR = output_buffer[output_offset - 1];
+	}
+}
+
+ISR(USART_TXC_vect)
+{
+	if (output_end == output_offset)
+		return;
+
+	UDR = output_buffer[output_offset];
+	output_offset++;
+}
+
+ISR(USART_RXC_vect)
+{
+	if (input_end == sizeof(input_buffer))
+		input_end = 0;
+
+	input_buffer[input_end++] = UDR;
+	input_end -= serial_rx_cb(input_buffer, input_end);
+}
+
+void serial_toggle_verbose(void)
+{
+	verbose = 1 - verbose;
+}
+
+void serial_init(void)
+{
+	UBRRH = UBRRH_VALUE;
+	UBRRL = UBRRL_VALUE;
+	UCSRA = 0x00;
+	UCSRB = (1 << RXCIE) | (1 << TXCIE) | (1 << RXEN) | (1 << TXEN);
+	UCSRC = (1 << URSEL) | (1 << UCSZ1) | (1 << UCSZ0);
+}
diff --git a/serial.h b/serial.h
new file mode 100644
index 0000000..5f6d7b6
--- /dev/null
+++ b/serial.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2012 (C) Christian Franke <nobody at nowhere dot ws>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with This program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#ifndef SERIAL_H
+#define SERIAL_H
+
+#include <stdint.h>
+
+extern uint16_t serial_rx_cb(char *buffer, uint16_t len);
+
+void serial_send(const char *buffer, uint16_t len, uint8_t urgent);
+void serial_toggle_verbose(void);
+void serial_init(void);
+
+#endif
+