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I2C difference 4.014 -->4.032-->

 
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jaska



Joined: 30 Aug 2008
Posts: 1

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I2C difference 4.014 -->4.032-->
PostPosted: Sat Aug 30, 2008 3:22 am     Reply with quote
I have code, working very well in 4.014.

After updating dont work.
What is changed?

I use PIC18F458.

I have already programmed memory, program cant read anything from
memory.... Maybe dont write too...

Jaska


Code:
#ifndef EEPROM_SDA
#define EEPROM_SDA PIN_B1
#define EEPROM_SCL PIN_B0
#endif

#use i2c(master, sda=EEPROM_SDA, scl=EEPROM_SCL)
#define EEPROM_ADDRESS LONG int
#define EEPROM_SIZE   65535

void init_ext_eeprom()
{
   output_float(EEPROM_SCL);
   output_float(EEPROM_SDA);
}

void write_ext_eeprom(long int 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);
}
}

BYTE read_ext_eeprom(long int 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);
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Aug 30, 2008 12:02 pm     Reply with quote
Post a test program that calls these functions. See the example code
below. The program below has the following output:
Quote:

Start
FF FF
55 AA

Code:
#include <18F452.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

#define EEPROM_SDA PIN_B1
#define EEPROM_SCL PIN_B0
#include <24256.c>

//=====================================
void main()
{
printf("Start\n\r");

init_ext_eeprom();

// Erase the first two bytes/
write_ext_eeprom(0, 0xFF);
write_ext_eeprom(1, 0xFF);

// Read them. They should be 0xFF.
printf("%X  ", read_ext_eeprom(0));
printf("%X", read_ext_eeprom(1));
printf("\n\r");

// Write 0x55 and 0xAA to the first two bytes.
write_ext_eeprom(0, 0x55);
write_ext_eeprom(1, 0xAA);

// Read and display the first two bytes.
printf("%X  ", read_ext_eeprom(0));
printf("%X", read_ext_eeprom(1));
printf("\n\r");

while(1);
}   
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