> -----Original Message----- > From: > avr-gcc-list-bounces+eric.weddington=atmel....@nongnu.org > [mailto:avr-gcc-list-bounces+eric.weddington=atmel....@nongnu. > org] On Behalf Of Thomas D. Dean > Sent: Monday, May 04, 2009 4:37 PM > To: avr-gcc-list@nongnu.org > Subject: [avr-gcc-list] Using in/out Instructions with ATmega128 > > I have > # avr-gcc --version > avr-gcc (GCC) 4.3.2 > Copyright (C) 2008 Free Software Foundation, Inc. > ... > > I want to use the ATmega128 and in/out instructions for > registers below > 0x40. > > # avr-gcc -mmcu=atmega128 -c -o 4x40-lcd.o xxx.c
Also, you need to turn optimization on to get those IN/OUT instructions. Add -Os to your compiler flags. _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
