RE: [avr-gcc-list] _EEGET and _EEPUT

[Brian Korsedal]

This code base was originally designed for IAR and then ported over to GCC.
I'd like to stick with _EEGET and _EEPUT as long as there are no big
problems.  I think I figured out what I was doing wrong.  I was passing
&serialAddress instead of serialAddress to _EEPUT.  I'll try it in the
device and see what I get.


-----Original Message-----
From:   E. Weddington [mailto:address@hidden
Sent:   Mon 9/15/2003 8:25 AM
To:     Brian Korsedal; address@hidden
Cc:     
Subject:        Re: [avr-gcc-list] _EEGET and _EEPUT
> I'm trying to save a variable to eeprom so that when I 
turn the device off,
> it remembers the value of the variable.  Every time I 
start up the device, I
> call the line with _EEGET in it.  Whenever the variable 
changes, I call one
> of the lines with _EEPUT in it.  The address is defined 
on the first page.
> Does anyone see anything wrong with how I am implimenting 
this.  Does anyone
> know where I can find a good description of _EEPUT and 
_EEGET?
> 
> loadsave.h:#define EEOS_SERIAL_ADDRESS 0x0401
> 
> main.c:  _EEGET (serialAddress, EEOS_SERIAL_ADDRESS);
> 
> mmi.c:      if((choice==MI_SERIAL_ADDRESS)&&
((serialAddress &
> 0x0f)<0x0E)){serialAddress++;_EEPUT (EEOS_SERIAL_ADDRESS, 
&serialAddress);}
> 
> mmi.c:      if((choice==MI_SERIAL_ADDRESS)&&
((serialAddress &
> 0x0f)>0x00)){serialAddress--;_EEPUT (EEOS_SERIAL_ADDRESS, 
&serialAddress);}
> 
> mmi.c:      if((choice==MI_SERIAL_ADDRESS)&&
((serialAddress &
> 0x0f)<0x0E)){serialAddress++;_EEPUT (EEOS_SERIAL_ADDRESS, 
&serialAddress);}
> 
> mmi.c:      if((choice==MI_SERIAL_ADDRESS)&&
((serialAddress &
> 0x0f)>0x00)){serialAddress--;_EEPUT (EEOS_SERIAL_ADDRESS, 
&serialAddress);}
> 
> 

The two macros _EEPUT and _EEGET are defined strictly for 
compatibility with the IAR compiler. These can be found in 
<installdir>/avr/include/avr/eeprom.h.

If you do not need compatibility with IAR, I would suggest 
you use the preferred avr-libc API:
eeprom_read_byte
eeprom_write_byte

See the avr-libc user manual for more information.

Eric

PS: Your first message came across
fine.