I2C protocol debbugging

thunaivendan said:

Hi guys,

I finished a code for I2C..when i stimulated in proteus..i2c debugger shows error message is "DATA written in SSPBUF whilst MSSP(i2c in matermode) data has been ignored"

But written data shown in i2c debbugger..here i attached images..
and written data is 0x05 in debbugger viewed as 0x50..
and if send a string how it's possible...

Click to expand...

Vengateswaran said:

I think storing of bits in the address is the problem.. check whether MSB or LSB is receiving first.

Click to expand...

void main()
{
 TRISE=0;
 PORTE=0;
 TRISD=0;   
 PORTD=0;
 TRISC=0xff;
 PORTC=0;
 ADCON1=0x06;
 lcd_init();
 i2c_init();
 i2c_start();
 i2c_address(0xa0,0);
// i2c_ack();
 i2c_restart();
 i2c_address(0xa0,0);
 //i2c_ack();
 i2c_address(0x00,0);
 i2c_ack();
 i2c_write(0x05);
 //i2c_ack();
 i2c_stop();
 i2c_ack();
// i2c_wait();
 i2c_start();
 i2c_address(0xa0,1);
 i2c_restart();
 i2c_address(0xa0,1);
 //i2c_read(0);
 
 *value=i2c_read(1);
 disp_data((value));
 //delay_ms(10);    
}

thunaivendan said:

hi guys
my data is 0x05
when i seen in debugger 0x50...i doubt with,whether data is written or not...
below this routine for main()

Code:

void main()
{
 TRISE=0;
 PORTE=0;
 TRISD=0;   
 PORTD=0;
 TRISC=0xff;
 PORTC=0;
 ADCON1=0x06;
 lcd_init();
 i2c_init();
 i2c_start();
 i2c_address(0xa0,0);
// i2c_ack();
 i2c_restart();
 i2c_address(0xa0,0);
 //i2c_ack();
 i2c_address(0x00,0);
 i2c_ack();
 i2c_write(0x05);
 //i2c_ack();
 i2c_stop();
 i2c_ack();
// i2c_wait();
 i2c_start();
 i2c_address(0xa0,1);
 i2c_restart();
 i2c_address(0xa0,1);
 //i2c_read(0);
 
 *value=i2c_read(1);
 disp_data((value));
 //delay_ms(10);    
}

:???::???::???:

Click to expand...

sarathhari said:

You must share the code for i2c_init,i2c_address and read the error may be in the configurations and also include a delay of 50 - 100 ms in between i2c_read and disp_data.

Click to expand...

void i2c_init()//I2C intialize Function
{
TRISC3=1;
TRISC4=1;
SSPSTAT=0x80;
SSPCON=0x28;
//SSPCON2=0x00;
SSPADD=(((_XTAL_FREQ/4)/i2c_speed)-1);
}
void i2c_start()//I2C Strart Function
{     i2c_wait();
      SEN = 1;         /* Start condition enabled */
        while(SEN);    /* automatically cleared by hardware */
                       /* wait for start condition to finish */
}
void i2c_stop()//I2C Stop Function
{ 
   i2c_wait(); 
    PEN = 1;         /* Stop condition enabled */
        while(PEN);  /* Wait for stop condition to finish */
                     /* PEN automatically cleared by hardware */

}
void i2c_restart()
{  i2c_wait(); 
   RSEN=1;
   while(RSEN);
}
void i2c_ack()
{
  ACKDT=0;ACKEN=1;
  while(ACKEN);
  
}
void i2c_nack()
{
  ACKDT=1;ACKEN=1;while(ACKEN);
 
}
void i2c_write(unsigned char data)
{  SSPIF=0;
   SSPBUF=data;
   while(!SSPIF);     
   i2c_ack();
}
void i2c_address(unsigned char address, unsigned char mode)
{
    unsigned char l_address;
    l_address=address|mode;
    //l_address+=mode;
    i2c_wait();
    SSPBUF = l_address;
}
unsigned char i2c_read(unsigned char ack)
{
    // Read data from slave
    // ack should be 1 if there is going to be more data read
    // ack should be 0 if this is the last byte of data read
    unsigned char i2c_read_data;

    i2c_wait();
    RCEN=1;
    while(RCEN);
    while(!BF); 
    i2c_wait();
    if ( ack ) ACKDT=0;	        // Ack
    else       ACKDT=1;	        // NAck
    ACKEN=1;                    // send acknowledge sequence
   // i2c_read_data = SSPBUF;
    //i2c_wait();
    return(SSPBUF);
}

void i2c_wait()
{
 while ( ( SSPCON2 & 0x1F ) || ( SSPSTAT & 0x04 ) );
}

thunaivendan said:

kindly debbugg it soon,,,,,

Code:

void i2c_init()//I2C intialize Function
{
TRISC3=1;
TRISC4=1;
SSPSTAT=0x80;
SSPCON=0x28;
//SSPCON2=0x00;
SSPADD=(((_XTAL_FREQ/4)/i2c_speed)-1);
}
void i2c_start()//I2C Strart Function
{     i2c_wait();
      SEN = 1;         /* Start condition enabled */
        while(SEN);    /* automatically cleared by hardware */
                       /* wait for start condition to finish */
}
void i2c_stop()//I2C Stop Function
{ 
   i2c_wait(); 
    PEN = 1;         /* Stop condition enabled */
        while(PEN);  /* Wait for stop condition to finish */
                     /* PEN automatically cleared by hardware */

}
void i2c_restart()
{  i2c_wait(); 
   RSEN=1;
   while(RSEN);
}
void i2c_ack()
{
  ACKDT=0;ACKEN=1;
  while(ACKEN);
  
}
void i2c_nack()
{
  ACKDT=1;ACKEN=1;while(ACKEN);
 
}
void i2c_write(unsigned char data)
{  SSPIF=0;
   SSPBUF=data;
   while(!SSPIF);     
   i2c_ack();
}
void i2c_address(unsigned char address, unsigned char mode)
{
    unsigned char l_address;
    l_address=address|mode;
    //l_address+=mode;
    i2c_wait();
    SSPBUF = l_address;
}
unsigned char i2c_read(unsigned char ack)
{
    // Read data from slave
    // ack should be 1 if there is going to be more data read
    // ack should be 0 if this is the last byte of data read
    unsigned char i2c_read_data;

    i2c_wait();
    RCEN=1;
    while(RCEN);
    while(!BF); 
    i2c_wait();
    if ( ack ) ACKDT=0;	        // Ack
    else       ACKDT=1;	        // NAck
    ACKEN=1;                    // send acknowledge sequence
   // i2c_read_data = SSPBUF;
    //i2c_wait();
    return(SSPBUF);
}

void i2c_wait()
{
 while ( ( SSPCON2 & 0x1F ) || ( SSPSTAT & 0x04 ) );
}

Click to expand...