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how is the page writing?

 
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mojsa2000



Joined: 18 May 2010
Posts: 78

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how is the page writing?
PostPosted: Sun Jan 09, 2011 8:14 am     Reply with quote
Hi
I want to erase a 24c512 by a pic16f877a. I know that I must write 0xff to entire memory.
I could do it for one page not more pages.
the code is:
Code:

#bit ack_check=0x91.6
#define write_cmd 0xA0
#define read_cmd 0xA1


void erasing(int16 address,int data)
{
i2c_start();
i2c_write(write_cmd);
if(ack_check==0)
i2c_write(address>>8);
if(ack_check==0)
i2c_write(address);
if(ack_check==0)
while(j<128){
i2c_write(data);
j++;
}
if(ack_check==0)
i2c_stop();
delay_ms(10);
}
///***************************
for(k=0;k<80;k++){
erasing(k*128,0xff);
delay_ms(100);
}

but it didn't work.please help me.
thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jan 09, 2011 3:27 pm     Reply with quote
This thread has a 24LC256 eeprom driver that has functions for Page mode.
http://www.ccsinfo.com/forum/viewtopic.php?t=17787

If you want to use it with a 24LC512 eeprom, you need to do two things:
1. Change #define EEPROM_PAGE_LEN to 128.
2. Use an 18F PIC, instead of 16F877. That's because the 16877 can't
do a ram buffer larger than about 96 bytes. The 18F PICs can easily
do a 128 byte buffer.
mojsa2000



Joined: 18 May 2010
Posts: 78

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it was solved
PostPosted: Mon Jan 10, 2011 11:13 am     Reply with quote
Hi
thanks.
I changed the code and it worked:
Quote:

#bit ack_check=0x91.6
#define write_cmd 0xA0
#define read_cmd 0xA1

void erasing(int16 address,int data)
{
i2c_start();
i2c_write(write_cmd);
if(ack_check==0)
i2c_write(address>>8);
if(ack_check==0)
i2c_write(address);
if(ack_check==0)
for(j = 0; j < 128; j++)
i2c_write(data);
if(ack_check==0)
i2c_stop();
delay_ms(10);
}
///***************************
for(k=0;k<80;k++){
erasing(k*128,0xff);
delay_ms(100);
}
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