Implement onboard eeprom on f2812

Did you notice that the flash memory has very limited erase/write cycles count? Guaranteed 100 cycles, nominal 1000 as I remember.

no, i didn't realize that. Do you have the reference to that?

What would be the next best implementation of eeprom?

Henry,

The flash endurance is for an entire erase/program iteration. You can write single bytes to a single sector until the sector is filled. In this case, once the sector is full you would need to erase it. This would count as one iteration of program/erase cycle. We have an app note with example code that does just as you described. One sector is used to emulate an EEPROM. This is available at:

http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=sprab69

Regards,

Tim Love

If i understand correctly, the above method is only good for small eeprom memory requirement. For example, if you only need to write a 1-word (16-bit) eeprom variable, and you have 4K x16bit section of flash to use, you can write that variable 4K times sequentially into that section before erasing and rewriting. Thus increasing the max write cycles to 4K x 100.

However, if you need 2K of eeprom memory, this method will only provide 200 write cycles.

The reference to erase/write cycle count is main datasheet probably. I think that the only way to workaround your problem is connecting external eeprom by spi for ex 25LC040 or another capacity. Its cheap (1-3$).