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[51] AT89C2051 interface with EEprom 24C08,In for loop it wont write the data.

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yuvarajbe

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Hi
I am working Interface EEPROM 24C08 with AT89C2051 controller.
I wrote some code for Read/Write the Values(0 to 9) in 24C08.
I am starting with Just counter program which shows Read/Write Values in BCD 7 segment.
Here Problem is for first time it works well when I press P3^5 button.After enter into forloop It wont execute the Read/write operation.For your refernce i have attached Code and simulation which i done.

code:
Code C - [expand]
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#include "Includes.h"
sbit enter = P3^5;
 
 
void delay_ms1(int);           // Function prototype declaration
 
int a[10]={0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x80,0x90}; 
 
 
 
void main (void)
{
unsigned char RxByte,chh1,chh2,c2,c1;
 
    unsigned char RxByte1;
//        
  if(enter==0){
     
     chh2=2+'0';
    
    
      
        
    Write_Byte_To_24LC64_EEPROM(0x0002, chh2);
 
        }
      
    // Read from 0x0001 address from EEPROM     
    RxByte1 = Read_Byte_From_24LC64_EEPROM(0x0002); 
    // Read from 0x0001 address from EEPROM     
    [ATTACH=CONFIG]135696._xfImport[/ATTACH]    
       P1=0x04;
   P1=P1|(a[RxByte1]);
     delay_ms1(1000);
 
   for (c1=(RxByte1);c1<10;c1++)
   {
    
    
   Write_Byte_To_24LC64_EEPROM(0x0001,c1+0x30);[B]//here is the Problem.It wont write in EEPROM[/B]
   P1=0x04;
   P1=P1|(a[c1]);
     delay_ms1(1000);
       
   }
 
     ////////////////////////////END////////////////////////////
 
  } 
 
     
void delay_ms1(int secc)
{
    int j1;
    int i1;
    for(i1=0;i1<secc;i1++)
    {
        for(j1=0;j1<110;j1++)
        {
        }
    }
}
 
Last edited by a moderator:

You are trying to interface with the 24C08 device using the code wrote for the 24C64 device; Both are not completelly compatible: The first one uses just 1 byte address whereas the second one uses 2 byte addresses.
 
Hi
Thanks for ur reply.

I changed address into 2byte. then also It wont write inside the for loop. but outside the loop Read/write operation works well.here I change the code shown below.

code:
Code C - [expand]
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#include "Includes.h"
sbit enter = P3^5;
 
 
void delay_ms1(int);           // Function prototype declaration
 
int a[10]={0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x80,0x90}; 
 
 
 
void main (void)
{
unsigned char RxByte,chh1,chh2,c2,c1;
 
    unsigned char RxByte1;
//        
  if(enter==0){
     
     chh2=2+'0';
    
    
      
        
    Write_Byte_To_24LC64_EEPROM(0x02, chh2);
 
        }
      
    // Read from 0x01 address from EEPROM     
    RxByte1 = Read_Byte_From_24LC64_EEPROM(0x02); 
    // Read from 0x01 address from EEPROM


View attachment 135696 

Code C - [expand]
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P1=0x04;
   P1=P1|(a[RxByte1]);
     delay_ms1(1000);
 
   for (c1=(RxByte1);c1<10;c1++)
   {
    
    
   Write_Byte_To_24LC64_EEPROM(0x02,c1+0x30);[B]//here is the Problem.It wont write in EEPROM[/B]
   P1=0x04;
   P1=P1|(a[c1]);
     delay_ms1(1000);
       
   }
 
     ////////////////////////////END////////////////////////////
 
  } 
 
     
void delay_ms1(int secc)
{
    int j1;
    int i1;
    for(i1=0;i1<secc;i1++)
    {
        for(j1=0;j1<110;j1++)
        {
        }
    }
}
 
Last edited by a moderator:

Hi,

I don't see that it checks "busy" flag. Instead it uses nasty busy waits.
They are very long in time and draw 100% processing power.
I rather think therefore your program misses some data to read from your serial port than to write it to EEPROM.

Klaus

Btw: There are a lot of discussions about 24xx EEPROM including code here in this forum.
 

Thanks for supporting me.

Its working.
 

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