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lost eeprom data when eeprom address upper than 256(18f8722)

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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Aug 19, 2010 3:24 pm

Reply with quote

Try a very simple test program, such as the one shown below.
I ran it in MPLAB simulator with vs. 4.110 and I got this result:

Quote:

Initial values: 55, aa
After writing: 12, 34

That's correct. Try it and see what you get. If it fails, then post your
compiler version.

Code:

#include <18F8722.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

#rom int8 0xf00000={0x55, 0xAA}

//==========================
main()
{
int8 a;
int8 b;

a = read_eeprom(0);
b = read_eeprom(1);

printf("Initial values: %x, %x \n\r", a, b);

write_eeprom(0,0x12);
write_eeprom(1,0x34);

a = read_eeprom(0);
b = read_eeprom(1);

printf("After writing: %x, %x \n\r", a, b);

while(1);
}

ali1_f

Joined: 19 Aug 2010
Posts: 4


Posted: Fri Aug 20, 2010 1:37 am

Thanks for your reply. Its working. Best Regards

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