Writing to 18F452 Flash memory

[SebDey]

Hello,

I'm not able to write to the program memory of my pic18f452 and don't know why. I'm using the built-in function WRITE_PROGRAM_MEMORY(...) but it has no effects (No change in device code). Perhaps a problem with the variables I'm using,.. but I really have no idea of what I'm doing wrong.

Here's my code, Im using PCH compiler v.3.129.

#include <18F452.h>
#fuses HS,NOWDT,NOBROWNOUT,NOLVP,NOPROTECT,WRT,WRTD,PUT,NOCPD,NOEBTR
#use delay(clock=20000000)

#define CPF 0x02
#define T_TYPE_ADDR 0x07E02

(...)

int count=getenv("FLASH_WRITE_SIZE"),data_to_write[8];
int32 address_to_write;

(...)

data_to_write[0]=CPF;
address_to_write=T_TYPE_ADDR;
write_program_memory(address_to_write,data_to_write,count);

(...)
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This message was ported from CCS's old forum
Original Post ID: 144515283

[SebDey]

In fact, there's a BUG in my version of PCH compiler (3.129), you have to specify NOWRT (!?) in order to have the config6L config. register set to the correct values for allowing writes to FLASH memory (By the way, specifying WRT will protect the FLASH from writes...)
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This message was ported from CCS's old forum
Original Post ID: 144515292

[Tomi]

Maybe it is not a bug, just a new feature .
From the fuses.txt:
"
..........
NOWRT Program memory not write protected
..........
WRT Program Memory Write Protected
..........
"
So maybe WRT is not "WRiTe" but "WRite protecT" what is a not too lucky name convention

:=In fact, there's a BUG in my version of PCH compiler (3.129), you have to specify NOWRT (!?) in order to have the config6L config. register set to the correct values for allowing writes to FLASH memory (By the way, specifying WRT will protect the FLASH from writes...)
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This message was ported from CCS's old forum
Original Post ID: 144515296

[SebDey]

Maybe you're right, but it's confusing because in the 'valid fuses' menu, you've got:

WRT Allow programs to write to flash
NOWRT No writting to flash from a program

anyway, my problem is over now, and I hope that it'll be useful for someone to know this 'problem'

Thanks

SebD


:=Maybe it is not a bug, just a new feature <img src="http://www.ccsinfo.com/pix/forum/smile.gif" border="0">.
:=From the fuses.txt:
:="
:=..........
:=NOWRT Program memory not write protected
:=..........
:=WRT Program Memory Write Protected
:=..........
:="
:=So maybe WRT is not "WRiTe" but "WRite protecT" what is a not too lucky name convention <img src="http://www.ccsinfo.com/pix/forum/smile.gif" border="0">
:=
:=:=In fact, there's a BUG in my version of PCH compiler (3.129), you have to specify NOWRT (!?) in order to have the config6L config. register set to the correct values for allowing writes to FLASH memory (By the way, specifying WRT will protect the FLASH from writes...)
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515318