AVR Freaks

SOLVED.

It's a pretty simple self written makefile which I use for al my projects and the last thing I suspected was the makefile itself.

There is no CC= or GNUmakefile and hardly any automatic stuff.

Because the file "header.h" did not exist in " ~/false/ " my own rule for making a %.o could not be resolved and make defaulted to one of it's own rules.

Small excerpt from my make file:

MYDEPEND= main.h header.h makefile

%.o: %.cpp %.h $(MYDEPEND)
	$(COMPILE) $<

Whole makefile (and a bit more):

paul@dualcore ~/false $ make all --debug
Reading makefiles...
Updating goal targets....
 File `all' does not exist.
   File `main.hex' does not exist.
     File `main.elf' does not exist.
       File `main.o' does not exist.
      Must remake target `main.o'.
g++    -c -o main.o main.cpp
In file included from main.cpp:14:0:
main.h:11:20: fatal error: avr/io.h: No such file or directory
 #include <avr/io.h>
                    ^
compilation terminated.
make: *** [main.o] Error 1
paul@dualcore ~/false $ cat makefile
#================================== Definition of internal variables for make.
#MCU	= atmega328
MCU	= atmega328p
#MCU	= atmega8

# main.h must be included automagically to get the main.h from the
# project directory instead of the main.h from the dir it is included from.
COMPILE	= avr-gcc -x c++ -c $(CFLAGS) -include main.h
LINK	= avr-gcc $(LINKFLAGS) $(LINKFILES)
AS	= avr-gcc -x assembler-with-cpp
RM	= rm -f

COMMON	= -mmcu=$(MCU)
MYLIB	= /home/paul/projects/avr/lib
MYDEPEND= main.h header.h makefile

# Use optimisation level -O1 for debugging with "Debug" lib.
CFLAGS  = $(COMMON) -g -O3 -fshort-enums -fno-gcse -Wall -mcall-prologues -lm
CFLAGS += -I$(MYLIB)	# Include directory for my own libs.

ASMFLAGS= $(COMMON) -Wa, -gstabs
LINKFLAGS= $(COMMON) -g -Wl,-Map=$(<:.o=.map),--cref

#============================================================= Files to link.
LINKFILES = main.o
#LINKFILES+= delay.o
LINKFILES+= lcd-pcd8544.o
#LINKFILES+= mumarnet.o
LINKFILES+= mumarnet_rf.o
LINKFILES+= timer.o
LINKFILES+= threadnetwork.o
LINKFILES+= keyboard.o
#LINKFILES+= twi.o

#======================================= Rules for compiling to object files.
# a general rules for compiling c or cpp files.
%.o: %.cpp %.h $(MYDEPEND)
	$(COMPILE) $<

%.o: %.c %.h $(MYDEPEND)
	$(COMPILE) $<

# Tell avr-gcc where to find the source code for all my own "libraries":
# They are all compiled separately because they take their (pin) configuation
# from the "main.h" file of the project they are compiled for.
delay.o: $(MYLIB)/delay/delay.cpp $(MYLIB)/delay.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/delay/delay.cpp

lcd.o: $(MYLIB)/lcd/lcd.cpp $(MYLIB)/lcd.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/lcd/lcd.cpp

lcd-pcd8544.o: $(MYLIB)/lcd-pcd8544/lcd-pcd8544.cpp $(MYLIB)/lcd-pcd8544.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/lcd-pcd8544/lcd-pcd8544.cpp

mumarnet.o: $(MYLIB)/mumarnet/mumarnet.cpp $(MYLIB)/mumarnet.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/mumarnet/mumarnet.cpp

mumarnet_rf.o: $(MYLIB)/mumarnet/mumarnet_rf.cpp $(MYLIB)/mumarnet_rf.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/mumarnet/mumarnet_rf.cpp

timer.o: $(MYLIB)/timer/timer.cpp $(MYLIB)/timer.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/timer/timer.cpp

keyboard.o: $(MYLIB)/keyboard/keyboard.cpp $(MYLIB)/keyboard.h $(MYDEPEND)
	$(COMPILE) $(MYLIB)/keyboard/keyboard.cpp

#================================================================== Targets.
main.elf: $(LINKFILES)
	$(LINK) -o main.elf
	avr-objdump -h -S main.elf > main.lst
	avr-size main.elf
#	avr-gcc $(OBJ) $(LIB) $(LDFLAGS) $(LINKFILES) -o main.elf

main.hex: main.elf
	avr-objcopy -j .text -j .data -j .bss -O ihex main.elf main.hex

all: main.hex

#avrdude -q = quiet,  -e = chip erase
program: main.hex
	avrdude -p $(MCU) -c usbasp -qe -U flash:w:main.hex:i

# m328p Internal 8MHz RC, EEsave, No wdt, brown. Engbedded, 20140627.
fuses:
	avrdude -p atmega328p -c usbasp -qeB40 -U lfuse:w:0xe2:m -U hfuse:w:0xd1:m

reset:
	avrdude -p $(MCU) -c usbasp -B300 -Ulfuse:v:0x00:m

clean:
	$(RM) *.rom *.eep *.obj *.hex
	$(RM) *.o *.s *.elf *.lst *.map
	$(RM) *.bak *.Bak *.c_sym *.avd *.aio
	$(RM) *.~h *.~c *.~bp *.~cp *.tds
	$(RM) *.h~ *.c~ *~

For anyone curious:

For each of my projects all the pin definitions are in the file main.h of that project.

For each "library" the makefile takes the source of that "library" and compiles it whith the right pin definitions for the current project.

In this way I can reuse my libraries and still use different hardware I/O pins for connected hardware.

Also, any update of library code is automatically updated when a project is recompiled.

This works pretty good for me. For example: "mumarnet" uses interrupt controlled uart / RS485 combination, and "mumarnet_rf" uses (hardware or software) SPI with an nRF24L01 module. These are interchangable with changing just a few lines of code and the sw SPI variant can be connected to arbitrary pins on all cpu's I've tried.

Some time ago I was tired of maintaining the different header files for each project and I removed them from the project source files and dumped them all in header.h.

Modern pc's are so fast that the extra overhead is negligable for avr projects. But I did overlook the problem above when recompiling one of my old projects...

I want to publish most of my projects, but I'm having some problems with updating my site / html, (and with makefiles).

Did some reading on:

https://www.gnu.org/software/mak...

which hinted that changing my "COMPILE = " to: "CC = " would overrule one of the auto generated rules from make and therefore would have made it easier to debug my makefile, but this does not work. If I delete the "header.h" file make still tries to use "g++".