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Reserve EEPROM & Write data after 1st time power on

 
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hwho



Joined: 05 Mar 2007
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Reserve EEPROM & Write data after 1st time power on
PostPosted: Mon Mar 05, 2007 4:07 am     Reply with quote
How to reserve eeprom to store some calibration data
How to make sure reserved eeprom is empty before write any data after 1st time power on
Ttelmah
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PostPosted: Mon Mar 05, 2007 10:44 am     Reply with quote
Since nothing except your code talks to the EEPROM, it is all 'reserved', till you start to change it.
You can preset values in it during programming, using the #ROM directive. It is at address 0x2100, on 16 chips, and 0xF00000 on 18 chips.
The normal practice, would be to preload a 'marker' byte, that says that the area is not yet programmed. Perhaps something like 0X55, which you change to 0xAA once you have saved the required calibration.

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