RE: [avr-gcc-list] problem with EEPROM

[Geir Tore Olsen]

Hi There!

Corruption of the EEPROM is a well known problem with the AVR's. This is
easily solved with using an external brownout circuit. I.E. a circuit that
make sure that the controller is kept reset everytime the voltage is to low,
and that make sure that the circuit is kept reset until the voltage is high
enough.

Regards gtoo

-----Original Message-----
From: address@hidden [mailto:address@hidden
Behalf Of Juraj Buliscak
Sent: Monday, September 16, 2002 8:41 AM
To: address@hidden
Subject: [avr-gcc-list] problem with EEPROM


Hi all,


I am using AT90S2313.  In EEPROM on address 0x01 is written value 0xAA in
variable "val". Write process is OK. This is verified by downloadin eeprom
section using uisp eeprom download.

Now I want to read value of variable val from eeprom.
I use eeprom_rb function to read this value:

value = eeprom_rb((uint16_t)&val)

Problem is: after reading, value in eeprom is changed to 0xFF and eeprom_rb
is returning 0xFF not 0xAA.  I do not  know where is problem. I downloaded
eeprom by uisp after calling eeprom_rb and value on address 0x01 was
changed to 0xFF.

Could anybody help?

Juraj.


avr-gcc-list at http://avr1.org


avr-gcc-list at http://avr1.org