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Forum: Mikrocontroller und Digitale Elektronik [Anfänger-Probleme] Wie assembliere ich Assemblercode bei WinAVR?


Autor: JayJay (Gast)
Datum:

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Hallo alle zusammen!

Ich denke meine Frage wird bei vielen hier auf Kopfschütteln stoßen, 
aber ich bin gerade ein bisschen hilflos...

Ich mache gerade das AVR-Tutorial und hänge schon ganz am Anfang: Ich 
möchte den ersten Source-Code (s.u.) mit WinAVR assemblieren. Ich habe 
die neuste Portable-Version von WinAVR. Dazu habe ich ein neues Projekt 
in Programmers Notepad gemacht, den Source-Code von der Seite kopiert 
und in das Projekt gespeichert.
Danach hab ich den Makefile-Generator benutzt, alle Parameter 
eingestellt und die Datei "makefile" ins Projektverzeichnis gespeichert 
(s.u.).
Wieder in Programmers Notepad auf Tools -> Make All.

Folgernder Fehler tritt auf:

Linking: 2LEDs.elf
avr-gcc -mmcu=atmega8 -I. -gdwarf-2 -DF_CPU=8000000UL -O2 
-funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall 
-Wstrict-prototypes -Wa,-adhlns=  -std=gnu99 -Wundef -MMD -MP -MF 
.dep/2LEDs.elf.d  --output 2LEDs.elf -Wl,-Map=2LEDs.map,--cref     -lm
H:/Portable/WinAVR-20080610/lib/gcc/avr/4.3.0/../../../../avr/lib/avr4/c 
rtm8.o:(.init9+0x0):  undefined reference to `main'
make.exe: *** [2LEDs.elf] Error 1

Es scheint mit fast so, als ob er eine c-Datei erwartet und keinen 
Assemblercode... wie man das aber im Makefile einstellt weiß ich auch 
net.

Wäre nett wenn mir jemand sagen könnte, wie ich an die begehrte .hex 
datei komme...

Danke im voraus!

Mfg JayJay
.include "m8def.inc"         ; Definitionsdatei für den Prozessortyp einbinden
 
         ldi r16, 0xFF       ; lade Arbeitsregister r16 mit der Konstanten 0xFF
         out DDRB, r16       ; Inhalt von r16 ins IO-Register DDRB ausgeben
 
         ldi r16, 0b11111100 ; 0b11111100 in r16 laden
         out PORTB, r16      ; r16 ins IO-Register PORTB ausgeben
 
ende:    rjmp ende           ; Sprung zur Marke "ende" -> Endlosschleife 

# 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 = atmega8


# 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 = 14745600
#         F_CPU = 16000000
#         F_CPU = 18432000
#         F_CPU = 20000000
F_CPU = 8000000


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


# Target file name (without extension).
TARGET = 2LEDs


# 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 =


# 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 = dwarf-2


# 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=gnu99


# Place -D or -U options here for C sources
CDEFS = -DF_CPU=$(F_CPU)UL


# Place -D or -U options here for ASM sources
ADEFS = -DF_CPU=$(F_CPU)


# 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 += -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)


#---------------- 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.
#  -adhlns:   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 = $(ADEFS) 
-Wa,-adhlns=$(<:%.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



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

# Programming hardware
# Type: avrdude -c ?
# to get a full listing.
#
AVRDUDE_PROGRAMMER = stk500v2

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

AVRDUDE_WRITE_FLASH = -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 $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
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
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 = $(SIZE) --mcu=$(MCU) --format=avr $(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



# 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
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 -R .fuse -R .lock $< $@

%.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 -z $< > $@

# 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 debug gdb-config

Autor: Ludger (Gast)
Datum:

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Autor: Rufus Τ. Firefly (rufus) (Moderator) Benutzerseite
Datum:

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Was soll das mit "PC-Programmierung" zu tun haben?

-> Verschoben.

Autor: Hannes Lux (Gast)
Datum:

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Für ein AVR-ASM-Programm würde ich das AVR-Studio benutzen, das ist 
extra dafür gemacht worden...

...

Autor: Johann L. (gjlayde) Benutzerseite
Datum:
Angehängte Dateien:

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Rufus t. Firefly wrote:
> Was soll das mit "PC-Programmierung" zu tun haben?
>
> -> Verschoben.

Naja, assembliert wird ja auf dem PC, und nicht auf dem AVR :o)

Hannes Lux wrote:
> Für ein AVR-ASM-Programm würde ich das AVR-Studio benutzen, das ist
> extra dafür gemacht worden...

Die beiden Assembler sind nicht kompatibel. Zudem würde ich den GNU 
Assembler (gas) als mächtiger einstufen.

Das Beispiel anbei ist ein Minimalbeispiel, es wurde übersetzt mit
avr-gcc -mmcu=atmega168 minimal.S -o minimal.elf

avr-gcc fungiert als Treiber für Assembler (avr-as) und Linker (avr-ld). 
main ist der Einsprungpunkt nach dem Startup-Code: In Section .init9 
steht ein jump nach main, daher die Fehlermeldung bei dir.

Der Linker erstellt eine Vektortabelle, und durch das Referenzieren  von 
__do_copy_data werden die Variablen in .data auf ihre Werte gesetzt 
(hier "wert").

Zu beachten ist weiterhin, ob ein SFR per IN/OUT oder STS/LDS adressiert 
wird, da es einen Offset von 0x20 gibt.

Anstatt dem kryptischen __vector_7 kann man auch ein Makro aus der 
avr/io.h verwenden, nämlich TIMER2_COMPA_vect bzw. SIG_OUTPUT_COMPARE2A.

Falls es Probleme beim Dateinamen gibt (muss .S und nicht .s sein), kann 
man auch irgendein Dateinamen/Extension verwenden, wenn man avr-gcc 
aufruft mit
-x assembler-with-cpp

Johann

Autor: JayJay (Gast)
Datum:

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Danke für die Antworten!

Ich hab mir AVR Studio geholt und jetzt funzt alles wie gewünscht! ^^

Mfg

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