AVR-Chat

On Dec 5, 2009, at 3:14 PM, Marc R.J. Brevoort wrote:

> Hi all,
>
> I've got a program that sends MIDI on an ATtiny2313.
>
> http://ringbreak.dnd.utwente.nl/~mrjb/electro/midisender.c
>
> I've also got a make file, as follows:
> CC=avr-gcc
> #HEADERS=-I /usr/src/linux-headers-2.6.24-19/include/asm-avr32/
> CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=attiny2313 $(HEADERS)
> #CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=atmega8 $(HEADERS)
> OBJ2HEX=/usr/bin/avr-objcopy
> UISP=/usr/local/bin/uisp
> TARGET=midisender
>
> program : $(TARGET).hex
> avrdude -c usbtiny -p m8 -e
> avrdude -c usbtiny -p m8 -U flash:w:$(TARGET).hex:i
> %.obj : %.o
> $(CC) $(CFLAGS) $< -o $@
>
> %.hex : %.obj
> $(OBJ2HEX) -R .eeprom -O ihex $< $@
>
> clean :
> rm -f *.hex *.obj *.o
>
> I want to use the code with an ATmega8 and have hooked up the
> ATmega8 appropriately.
>
> Now for the strange thing: I compiled the source with the
> above makefile (for the wrong microcontroller: attiny2313) and
> ran it on the ATmega8. It ran just fine.
>
> I then proceeded to add ADC code and found out the Makefile was
> wrong. To make sure all was still working, I removed the ADC code
> again and compiled for ATmega8. No MIDI output. I commented the
> ATmega8 line and restored the ATtiny2313 options, recompiled it
> and wrote it to the ATmega8- it worked.
>
> So if I compile it for ATtiny2313 and run it on ATmega8 it works.
> But if I compile for ATmega8 and run the same code on ATmega8, I
> get no MIDI output.
>
> I'm baffled. Why does my code not work on ATmega8 if I compiled
> for the ATmega8?
>
> Thanks in advance,
> Marc
>
> 
What compiler and what IDE?

Jim Wagner
Oregon Research Electronics

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