Program for reading/writing to serial eeprom

[hassan1980]

Serial Eeprom

I want an asm program for reading and writing to serial eeprom for example 24C64 and pic 16F84.

 

[IanP]

Re: Serial Eeprom

Here is a challenge for you: this site has been translated from Franch:
https://translate.google.com/transl...4C64%2BPIC16F84%2Basm&start=10&hl=en&lr=&sa=N

Good luck!!!

 

[Nick C.]

Re: Serial Eeprom

Hassan1980,

I think this link might help:

https://www.phanderson.com/PIC/16C84/24lc65.html

And I'd bet that if you sift through the Microchip application
notes, you'll find some more code examples.

Nick

 

[emkay]

Re: Serial Eeprom

hi...

i'm beginner in pic world ...but i'm going to build data logger project...

my idea is to use PIC16F88 that have i2c...compare to the F84..

my question is..is there any subroutine to read and write a data to/from external eeprom such 24L64?

thanks in advance

 

[gidimiz]

Re: Serial Eeprom

Hi,

here is the code in C on how to Read and Write to the internal eeprom of the PIC:
*****************************************************
void my_eeprom_write (char addr, char value)
{

while(WR)
continue;
EEADR=(addr);
EEDATA=(value);
EECON1&=0x7F;
CARRY=0;
if(GIE)
CARRY=1;
GIE=0;
WREN=1;
EECON2=0x55;
EECON2=0xAA;
WR=1;
asm("nop");
asm("nop");
if(CARRY)
GIE=1;
WREN=0;

}
**************************************************
/*********************************************************************
* EEPROM_READ_Function *
*********************************************************************/
unsigned char my_eeprom_read (char addr)
{
while(WR)
continue;
EEADR=addr;
EECON1&=0x7F;
RD=1;
//EEDATA;
return(EEDATA);
}
***************************************************************

For external use the I2C.

 

[emkay]

Re: Serial Eeprom

thanks a lot...

but the thing is...i try to run using assembly..

anybody...

one more thing..software routine i2c is more stable than hardware i2c?..

thanks in advance

 

[gidimiz]

Re: Serial Eeprom

Hi,

1. I made the code into assambly for the PIC16F88. attached is the complete output from the debuger in asm. you will have to retrive the code from there.

software routine i2c is more stable than hardware i2c

Hardware is alswys more stable then software, aslo the hardware gives you more time to use the MCU then spend it on unwanted things.

Good luck.

 

[emkay]

Re: Serial Eeprom

thanks..

but if i'm not mistake..this on efor internal eeprom..

i'm looking to the interface with external eeprom using internal hardware approach..like pi16f88 with 24LC512

thanks in advance

 

[gidimiz]

Serial Eeprom

Hi,

Well if you are using 24LC512 Then you must be using I2C. So, what you need is the I2C protocol.
To find out more how to do that go to:
www.microchipc.com
Good luck.