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pic30f4013, i2c problem

 
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karth



Joined: 10 Sep 2003
Posts: 29

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pic30f4013, i2c problem
PostPosted: Tue Oct 28, 2008 1:19 pm     Reply with quote
The problem is that i2c is not functioning properly, can anyone could see what I am doing wrong ? I verified the circuit and it is fine....

Here is my code:
Code:
#use i2c(Master,sda=PIN_F2,scl=PIN_F3, FORCE_HW, SLOW) // hw I2C

#define MAXREC 2370
#define MEM_MAIN   8
#define EEPROM_SDA                     PIN_F2
#define EEPROM_SCL                      PIN_F3

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

}


void write_ext_eeprom(int memaddr, BYTE dat,int8 HWADDR1)
{
   
   i2c_start();
   i2c_write((0xa0|HWADDR1)&0xfe);    // control byte
   i2c_write(memaddr>>8);
   i2c_write(memaddr);
   i2c_write(dat);
   i2c_stop();
   delay_ms(5);
   init_ext_eeprom();
}


BYTE read_ext_eeprom(int address,int8 HWADDR1)
{
   BYTE data;

   i2c_start();
   i2c_write((0xa0|HWADDR1)&0xfe);
   i2c_write(address>>8);
   i2c_write(address);
   i2c_start();
   i2c_write(0xa1|HWADDR1);
   data=i2c_read(0);
   i2c_stop();
   delay_ms(10);
   init_ext_eeprom();
   return(data);
}



void main()
{
int8 datatemp;
   setup_wdt(WDT_OFF);
   setup_timer1(TMR_DISABLED|TMR_DIV_BY_1);
   set_tris_f(0x1f);
   init_ext_eeprom();
   while(TRUE)
   {
   write_ext_eeprom(2,'K',MEM_MAIN);
   delay_ms(1000);
   datatemp=read_ext_eeprom(2,MEM_MAIN);
   delay_ms(1000); 
   } 
}

Embarassed Embarassed
karth



Joined: 10 Sep 2003
Posts: 29

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PostPosted: Tue Oct 28, 2008 1:37 pm     Reply with quote
When I change to ( FORCE_SW) shown as below, it works.
Is that a bug or else???
Code:
#use i2c(Master,sda=PIN_F2,scl=PIN_F3, FORCE_SW) // hw I2C
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