Write and Read from internal Memory

[ria_river]

I see..
Thank you so much Melanie..

I really learn a lot from this forum.

Cheers!

ria

[ria_river]

By the way Melanie..why we need to use PBPW instead of PBP in compiling?

What's the difference between them?

[joseph Degorio]

Hi Melanie,
I got your code running, initially I placed '9999' at memory location 0. I'm trying
to read it from the internal memory, So I try this code below. But when I press the button I got '655535'
instead the initial value '9999'.



TRISB=%00010000 ' All PortB is Output - except
' B.3 = Button
TRISC=%00000000 ' All PortC is Output
CMCON=%00000111 ' Disable Comparators
CVRCON=%00000000 ' Disable Reference Module
OPTION_REG.7=0 ' Enable Weak Pull-Up's
Pause 2000
ButtonPRESS var PortB.4 ' Push Button
WORDVariable var WORD

PromptLoop:
Serout PortC.1,6, [$FE,1,"Press Button..."]
While ButtonPRESS=1:Wend ' Wait here until Button Pressed
READ 0,WORDVariable.HighByte ' Reconstruct Word variable from EEPROM
READ 1,WORDVariable.LowByte
Serout PortC.1,6, [$FE,1,"Reading=",#WORDVariable] ' Display Result
While ButtonPress=0:Wend ' Wait here as long as finger is on Button
Goto PromptLoop
'
End

Thanks for the time, appreciate it very much,
joe

[mister_e]

Make sure your PIC programmer program the EEPROM location, unless.. you may read an empty EEPROM $FFFF

Now depending of how you wrote your DATA line, this may work.. or not.

data  @0, WORD 9999

should work.

Your PICProgrammer software should allow to see the EEPROM section, just compile your code, import the .HEX and look if your data is saved in the EEPROM.

[joseph Degorio]

Thanks all, I got it to work. But I've noticed that every time I compile it the data '9999' in Address 0 restarts to 655535. How can I prevent it from overwriting. So that every time I check Address 0 the same data will show.



Thanks all,
joe