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int32 address eeprom save using i2c

 
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X!nDy
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int32 address eeprom save using i2c
PostPosted: Wed Sep 23, 2009 12:54 am     Reply with quote
hello everybody, i have a code here that writes and reads data from an external eeprom(24fc1025).

Code:

void write_ext_eeprom(unsigned int32 address, BYTE data)
{
   short int status;
   i2c_start();
   i2c_write(0xa0);
   i2c_write(address>>8);
   i2c_write(address);
   i2c_write(data);
   i2c_stop();
   i2c_start();
   status=i2c_write(0xa0);
   while(status==1)
   {
      i2c_start();
      status=i2c_write(0xa0);
   }
   i2c_stop();
}

BYTE read_ext_eeprom(unsigned int32 address)
{
   BYTE data;
   i2c_start();
   i2c_write(0xa0);
   i2c_write(address>>8);
   i2c_write(address);
   i2c_start();
   i2c_write(0xa1);
   data=i2c_read(0);
   i2c_stop();
   return(data);
}

the problem is that if i write in an address that is beyond 65535, it goes back to the zero address and overwrites the data starting at the beginning. i already changed the parameters to int32 in my read_ext_eeprom and write_ext_eeprom but it still doesnt solve it.. can anybody here tell me whats wrong with my code? thanks in advance and god bless
[/quote]
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Sep 23, 2009 1:21 am     Reply with quote
CCS has a driver for this eeprom. You should use it:
Quote:
c:\program files\picc\drivers\241025.c

It does the addressing correctly.
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Wed Sep 23, 2009 1:49 am     Reply with quote
In addition, you may want to read about the block select bit in 24LC1025 data sheet.
X!nDy
Guest
PostPosted: Wed Sep 23, 2009 2:20 am     Reply with quote
thanks you for all your answers.. i really appreciate it. :D
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