Permanent store data using WRITE

Comments

• shandar Posts: 12

  2004-09-26 10:36 edited 2004-09-26 10:36

  Yep. Write stores the data in the EEPROM, which keeps the data (and you program) even if the BS2 loses power.
• tore eilertsen Posts: 15

  2004-09-26 10:48 edited 2004-09-26 10:48

  Hi
  Thanks for the answer, but wich memory location is then to be used, I have tried several locations
  from 0 and upwards, and this data is gone afther a power down
  
  (ex··· write 200,t1) or is this WRONG....
  
  ·
• K de Jong Posts: 154

  2004-09-26 13:35 edited 2004-09-26 13:35

  Hi Tore,
  
  Use for a Byte:
  
  WRITE x,T1
  READ x, T1
  
  Where x is the location.
  
  The EEPROM memory for the user goes from 0 upwards and for the program storage it goes from 2047 downwards. So eventually they will meet and then the program will most likely stop working . You can see the usage of EEPROM memory in the memory map, the button just to the left of the programming button in the Stamp editor.
  
  Regards,
  
  Klaus
• Jon Williams Posts: 6,491

  2004-09-26 18:49 edited 2004-09-26 18:49

  What is the size of t1?· If you're trying to write a word variable, do it like this:
  
  · WRITE 200, Word t1
  
  ... then read it back like this:
  
  · READ 200, Word t1
  
  
  You can use the Memory Map function of the IDE to see how much free EE space (starting at location 0) that you have for your stored information.
  
  ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
  Jon Williams
  Applications Engineer, Parallax
  Dallas Office
• tore eilertsen Posts: 15

  2004-09-28 16:53 edited 2004-09-28 16:53

  Jon Williams said...
  
  What is the size of t1?· If you're trying to write a word variable, do it like this:
  
  · WRITE 200, Word t1
  
  ... then read it back like this:
  
  · READ 200, Word t1
  
  
  
  You can use the Memory Map function of the IDE to see how much free EE space (starting at location 0) that you have for your stored information.
  

  This I cant get to work at all.
  I get the message "variable expected" and the 'word' in the line is marked
  Why is that, this is something I realy nead..
  
  tore
• Jon Williams Posts: 6,491

  2004-09-28 17:01 edited 2004-09-28 17:01

  Sorry, you must specify PBASIC 2.5 -- put this at the top of your program:
  
  ' {$STAMP BS2}
  ' {$PBASIC 2.5}
  
  I sometimes assume that everyone has discovered the advantages of PBASIC 2.5 syntax.· BTW, if you don't want to use PBASIC 2.5 syntax, you can do this:
  
  · WRITE 200, t1.LOWBYTE
  · WRITE 201, t1.HIGHBYTE
  
  This simulates using the Word modifier.· You get the value back like this:
  
  · READ 200, t1.LOWBYTE
  · READ 201, t1.HIGHBYTE
  
  ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
  Jon Williams
  Applications Engineer, Parallax
  Dallas Office
  
  Post Edited (Jon Williams) : 9/28/2004 5:04:31 PM GMT