Sorry, I've sent my message from another address, not registered to the list. Therefore I resend it from the proper one - Wojtek
On 14.11.2013 19:48, Matthias Trute wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, > > >> What's absolutely strange to me, is that definition of single word >> causes eeprom cells 2 and 3 to be rewritten 8 times (?!). > > I just committed a change that should not write anything > to the EEPROM if nothing will change. In your example the > address 2 should not be rewritten over and over again with > the same number. Its not that well tested however, feedback > would be very welcome. > > > Matthias Hi, I have checked the last trunk version (r1470), and it seems, that number of writes to the EEPROM is slightly reduced. However still the value at address 0x0002 is incremented after any single word is added to the FLASH. Only the higher word ad 0x0003 is not written unnecessarily. Wouldn't it be reasonable to update the whole word at 0x0002,0x0003 only after the whole compilation of a new word is finished? Yet more EEPROM friendly would be the solution (which I shortly described in the initial post in this thread), where the EE_DP and EE_FORTHWORDLIST are not located in the EEPROM, but in the RAM. Of course in this case their correct values should be calculated when AVR is booted. It could be done by scanning the FLASH, but in this case the list of compiled words should be a doubly-linked list (as the begining of the list only could be stored in the FLASH or EEPROM, and the list should be traversable in both directions - from the begining, when the FLASH is scanned after RESET, and from the end, when the word is looked up). So decreased wear of the FLASH would come at price of increased FLASH consumption for each word (additional pointer to the NEXT word should be added). If this pointer was located at the end of the compiled word, and value 0xffff denoted the last word, then it could be conveniently updated when the next word is compiled). I don't know is the above idea reasonable at all? -- Regards, Wojtek ------------------------------------------------------------------------------ Shape the Mobile Experience: Free Subscription Software experts and developers: Be at the forefront of tech innovation. Intel(R) Software Adrenaline delivers strategic insight and game-changing conversations that shape the rapidly evolving mobile landscape. Sign up now. http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
