[avr-libc-dev] [bug #17561] headers returning PORTx, PINx and DDRx incorrectly for Mega168

[Scott Price]

URL:
  <http://savannah.nongnu.org/bugs/?17561>

                 Summary: headers returning PORTx, PINx and DDRx incorrectly
for Mega168
                 Project: AVR C Runtime Library
            Submitted by: scottprice
            Submitted on: Monday 08/28/2006 at 20:17
                Category: Header
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
        Percent Complete: 0%
        Originator Email: address@hidden
             Open/Closed: Open

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Details:

If I compile this:

void
test(void) {
    PINB = 0;
    PORTB = 0;
    DDRB = 0;    
    PINC = 0;
    PORTC = 0;
    DDRC = 0;    
    PIND = 0;
    PORTD = 0;
    DDRD = 0;    

}

Using this command line:

avr-gcc -mmcu=atmega168 -D_01_ -Os -Wall -fpack-struct
-fdollars-in-identifiers -ffunction-sections  -DVERSION=00 -DVERSIONSMALL=00
-DVERSIONTINY=04  -c test.c -o test.o

I get:

00000000 <test>:
   0:   13 b8           out     0x03, r1        ; 3
   2:   15 b8           out     0x05, r1        ; 5
   4:   14 b8           out     0x04, r1        ; 4
   6:   16 b8           out     0x06, r1        ; 6
   8:   18 b8           out     0x08, r1        ; 8
   a:   17 b8           out     0x07, r1        ; 7
   c:   19 b8           out     0x09, r1        ; 9
   e:   1b b8           out     0x0b, r1        ; 11
  10:   1a b8           out     0x0a, r1        ; 10
  12:   08 95           ret



According to the datasheet those addresses should be 0x23, 0x24, 0x25...  I
get absolutely nothing when I try to use PORTB, etc, but it works if I use
the direct address in the datashet.

It seems to be something in sfr_defs.h, but I am having trouble following
that file.  I will keep looking at it to see if I can find the problem.

My compiler and assembler are:

address@hidden /usr/avr/include/avr]% avr-gcc --version
avr-gcc (GCC) 4.1.1 (Gentoo 4.1.1)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

address@hidden /usr/avr/include/avr]% avr-as --version
GNU assembler 2.17.50.0.3 20060715
Copyright 2005 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License.  This program has absolutely no warranty.
This assembler was configured for a target of `avr'.

I am using AVR-libc version 1.4.4








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