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Writting to atmel 24c32 eeprom

 
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Enveras



Joined: 04 Jun 2005
Posts: 1

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Writting to atmel 24c32 eeprom
PostPosted: Sat Jun 18, 2005 4:56 pm     Reply with quote
Hallo .

I tried to write to external eeprom atmel 24c32 ,
but no success .
I tried this simple code just for test :

#include <16f84a.h>
#fuses HS,NOWDT
#use delay(clock=4000000)
#include <2432.c>
#define I2C_SDA PIN_A0
#define I2C_SCL PIN_A1

main(){
int d;

init_ext_eeprom();

write_ext_eeprom(0x01,0xab);

delay_ms(100);
d = read_ext_eeprom(0x01);
delay_ms(100);

write_eeprom (0, d);
}


I used 2432.c driver in ccs library.
is there some simple code just to confirm my hardvare connection.
Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jun 18, 2005 5:13 pm     Reply with quote
1. The #define statements for the new pin assignments have to go
above the #include statement for the driver. That's the only way
the driver can know about them. Example:
Code:

#define I2C_SDA PIN_A0
#define I2C_SCL PIN_A1
#include <2432.c>     
 


2. You must not let the program fall off the end of main(), or the
PIC will go to sleep. Put a while(1); statement at the end of
your program. Example:
Code:

write_eeprom (0, d);

while(1);   // Add this line
}


3. The normal oscillator fuse setting for a 4 MHz crystal is "XT".
Example:
Code:
#fuses XT,NOWDT
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