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write_eeprom and PIC18F4525

 
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Fabri



Joined: 22 Aug 2005
Posts: 275

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write_eeprom and PIC18F4525
PostPosted: Thu May 29, 2008 3:23 am     Reply with quote

Hi to all,

I'm in trouble with write_eeprom and PIC18F4525. I can write and read eeprom till 0xFF address.
Does address is a (8 bit or 16 bit depending on the part) ?

I'm using ccs PCWH 3,249

Have you got any suggestion about ?

Regards,
Fabri
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Thu May 29, 2008 6:27 am     Reply with quote

Address must be a 16 bit variable. I guess you are using an 8 bit.
Fabri



Joined: 22 Aug 2005
Posts: 275

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PostPosted: Thu May 29, 2008 7:16 am     Reply with quote

I try this simple code:
Code:

write_eeprom(0x0125,0x34);


After read eeprom I found at address 0x25 data 0x34.
at address 0x0125 I found 0xFF

Have you got any suggestion ?

Regards,
Fabri
RArtz



Joined: 28 May 2008
Posts: 7

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PostPosted: Thu May 29, 2008 7:54 am     Reply with quote

ckielstra wrote:
Address must be a 16 bit variable. I guess you are using an 8 bit.


Syntax:
write_eeprom (address, value)

Parameters:
address is a (8 bit or 16 bit depending on the part) int, the range is device dependent

value is an 8 bit int

that was taken from the help file for CCS C.

I would suggest trying an 8 bit address instead of a 16 bit.
Fabri



Joined: 22 Aug 2005
Posts: 275

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PostPosted: Thu May 29, 2008 8:51 am     Reply with quote

I red the CCS help file, It was the first thing I did.

Anyway there was an error in compiler device editor.

After correct write_eeprom work fine all around eeprom of PIC18.

Thanks to all for support me,

Regards,
Fabri
ntgcp_08



Joined: 21 Feb 2008
Posts: 24

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PostPosted: Fri May 30, 2008 8:13 am     Reply with quote

Can you share what the error in the compiler device editor was? And can you share what you corrected to make it work?

Thanks
Fabri



Joined: 22 Aug 2005
Posts: 275

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PostPosted: Fri May 30, 2008 8:19 am     Reply with quote

with support of CCS I verify in:

TOOLS > DEVICE EDITOR > PIC18F4525

Under memory must be DATA EE = 1024

I correct it to 1024 from 255.

Regards,
Fabri
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