eeprom variables Crossworks AVR

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Lars Andersson

• June 24, 2010 06:22

I am interested in storing a set of variables in eeprom. It is important in what order these are stored since I will have both a bootloader and an application using these. In CodeVision I have seen something like this to make sure the variables are stored at memory location 0x001 :

#asm
.ESEG
.ORG 0x001
#endasm
eeprom unsigned char A=0x01;
eeprom unsigned char B=0x02;
#asm
.ESEG
.ORG 0x003
#endasm

This however assumes that the compiler always store the variables in the same order, which is not necessary the case. Can someone please help me out here with suggestions on how to solve this problem in crossworks.

/Lars

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  Robert Wood

  • July 14, 2010 16:43

  I had always assumed the user had to specify what was stored where, it had never occurred to me it would be possible to do it like you do with variables in RAM. The datasheets for all the AVRs I've ued have had C routines to show you exactly how to store and read EE values, BTW.

  Rob

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  Michael Johnson

  • July 15, 2010 10:21

  You'll need to create an array or a struct - in you want to guarantee the order - that's the way C is.

   

  Regards

  Michael

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