Re: [avr-gcc-list] Newbie Problems

[Volkmar Dierkes]

Hi,

these are warnings from objtool. objtool needs some information from 
the map file for global variables. I think it has to do with the 
static declaration. Do you need the static declaration at this 
point? Maybe you declare them better as a global variable outside of 
the ISR.

The warnings regards only to debug information for simulation. It 
didn't change anything or is neccessary for the program code.

I am not sure if it is possible to watch at these variables in 
simulation.

HTH

Volkmar

On Mon, 30 Dec 2002 15:16:23 +0530, Panther Electronics wrote:

> Hi,
>
> Can i get some explanation of the warning while compiling.
>
> WARNING: 'sensor_temp1' has no address in mapfile.
> WARNING: 'sensor_temp2' has no address in mapfile.
> WARNING: 'sw_temp1' has no address in mapfile.
> WARNING: 'sw_temp2' has no address in mapfile.
>
> the above variables are local to tim0 overflow; the values of sensor_temp1
> and sensor_temp2 is 0x00; that would mean that the variable value is lost
> on exit? what am i doing wrong?
>
> ---code--
>
> SIGNAL(SIG_OVERFLOW0)        /* signal handler for tcnt0 overflow interrupt */
> {
>   static unsigned char sensor_temp1, sensor_temp2;
>   static unsigned char sw_temp1, sw_temp2;
> /*
>     outp(~led, PORTB);       /* invert the output since a zero means: LED on
>     led <<= 1;               /* move to next LED
>     if (!led)                /* overflow: start with Port B0 again
>         led = 1;
>     */
>     outp(0x00, TCNT0);          /* reset counter to get this interrupt again 
> */
>     if ( timers_1 )
>         -- timers_1;
>     if ( timers_2 )
>         -- timers_2;
>
>     if ( db_1 == db )
>     {
>         sensor_temp2 =  inp(PIND) & 0x7c;         /* 0x7c = &b0111_1100 */
>         /* the balance code */
>     }
>     else
>     {
>         if ( bit_is_set( flag_1, in_flag_1 ) == 0 )
>         {
>             if ( bit_is_set( flag_1, sensor_in ) == 0 )
>             {
>                 sensor_temp1 = ( inp(PIND) & 0x7c );
>                 sbi ( flag_1, in_flag_1 );
>                 db_1 = 0;
>             }
>         }
>         else
>             ++ db_1;
>     }
>
> --- compiler snap shot ----
> avr-gcc --version
> avr-gcc (GCC) 3.3 20021209 (experimental)
> Copyright (C) 2002 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.
>
> "Size before:"
>   text           data            bss            dec            hex        
> filename
>    0           1760              0           1760            6e0        
> First.hex
> avr-gcc -c -g -Os -funsigned-char -funsigned-bitfields -fpack-struct 
> -fshort-enums -Wall -Wstrict-prototypes -Wa,-ahlms=First.lst -mmcu=at90s8515 
> -I. First.c -o First.o
> avr-gcc -Wl,-Map=First.map,--cref -mmcu=at90s8515 First.o    -lm --output 
> First.elf
> avr-objcopy -O ihex -R .eeprom First.elf First.hex
> avr-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" 
> --change-section-lma .eeprom=0 -O ihex First.elf First.eep
> objtool loadelf First.elf mapfile First.map writecof First.cof
> WARNING: 'sensor_temp1' has no address in mapfile.
> WARNING: 'sensor_temp2' has no address in mapfile.
> WARNING: 'sw_temp1' has no address in mapfile.
> WARNING: 'sw_temp2' has no address in mapfile.
> "Size after:"
>   text           data            bss            dec            hex        
> filename
>    0           1762              0           1762            6e2        
> First.hex
> "--------  end  --------"
> "Errors: none"
>> Exit code: 0
>
> thanks in advance
>
> Srikanth Kamath T
>
>
>
> avr-gcc-list at http://avr1.org
avr-gcc-list at http://avr1.org