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Can not write in internal EEPROM PIC18F252

 
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gernot
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Can not write in internal EEPROM PIC18F252
PostPosted: Tue Mar 25, 2003 4:17 pm     Reply with quote

Can not write in internal EEPROM PIC18F252.
I use this code:
B1=12;
B2=24;
write_EEPROM(adr, B1) ;
write_EEPROM(adr+1, B2) ;
B1=read_EEPROM(adr);
B2=read_EEPROM(adr+1);

... and B1/B2 after read is always 0xFF :-((

Thanks for help.
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This message was ported from CCS's old forum
Original Post ID: 13063
PCM programmer



Joined: 06 Sep 2003
Posts: 20262

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Re: Can not write in internal EEPROM PIC18F252
PostPosted: Tue Mar 25, 2003 4:30 pm     Reply with quote

:=Can not write in internal EEPROM PIC18F252.
:=I use this code:
:=B1=12;
:=B2=24;
:=write_EEPROM(adr, B1) ;
:=write_EEPROM(adr+1, B2) ;
:=B1=read_EEPROM(adr);
:=B2=read_EEPROM(adr+1);
:=
:=... and B1/B2 after read is always 0xFF :-((
:=
------------------------------------------------------------

What's your version of the PCH compiler ?
Here are some lines from the old CCS versions page:

3.092 Some EEPROM write issues are resolved
3.093 Another PIC18 EEPROM issue fixed
3.104 PIC18 PROGRAM_EEPROM read/write fixed/changed -- See readme.txt
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This message was ported from CCS's old forum
Original Post ID: 13065
TSchultz



Joined: 08 Sep 2003
Posts: 66
Location: Toronto, Canada

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RE: Can not write in internal EEPROM PIC18F252
PostPosted: Wed Mar 26, 2003 5:46 am     Reply with quote

:=Can not write in internal EEPROM PIC18F252.
:=I use this code:
:=B1=12;
:=B2=24;
:=write_EEPROM(adr, B1) ;
:=write_EEPROM(adr+1, B2) ;
:=B1=read_EEPROM(adr);
:=B2=read_EEPROM(adr+1);
:=
:=... and B1/B2 after read is always 0xFF :-((
:=
:=Thanks for help.

Make sure you have the fuses set correctly to allow writing of the EEPROM. This one caught me when I switched from the PIC16F877 to the PIC18F452. There are many more fuse settings that need to be correct for FLASH and/or EEPROM write, also the WDT is now controlled by fuse settings as well.

-Troy
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This message was ported from CCS's old forum
Original Post ID: 13078
gernot
Guest







Problem solved
PostPosted: Wed Mar 26, 2003 6:09 am     Reply with quote

Thanks for the help :-))
Fuse was the problem.
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This message was ported from CCS's old forum
Original Post ID: 13079
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