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How can I use I2C between 184620 & 18452

 
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sindyvirgo



Joined: 15 Jan 2009
Posts: 8

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How can I use I2C between 184620 & 18452
PostPosted: Tue Feb 17, 2009 12:26 am     Reply with quote
Who can basically test the procedure for me ?
184620 as master , 18452 as slave.
A Give materials to B through I2c, is printed out by UART of B.

Master of 4620 code :
Code:

void i2c_send_data()
{
 i2c_start();       // Start condition
 i2c_write(0xa0);   // Device address
 i2c_write('A');   // Low byte of command
 i2c_stop();        // Stop condition
}

void main()
{

for(;;)
  {
    i2c_send_data();
  }   
}

slave of 452 code :
Code:
#int_SSP
void  SSP_isr(void)
{
   BYTE incoming, state;
   state = i2c_isr_state();
   if(state < 0x80)   {
      incoming = i2c_read();
      if(state == 1)                     
         address = incoming;
         puts(incoming);
      if(state == 2)                     
         buffer[address] = incoming;
   }
       if(state == 0x80){
      i2c_write(buffer[address]);
   }
}
void main()
{
while (TRUE)
   {
      printf(" data from master ");
  }
}

How can I do ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Feb 18, 2009 2:21 am     Reply with quote
Quote:
if(state == 2)
buffer[address] = incoming;

You can expand the if() statement above, so that it also sets a global flag
to TRUE. The code in main() can check this flag. If it is TRUE,
then you can send data from the buffer[] array to the PC with printf.
Also set the flag to FALSE. The flag should be initialized to FALSE
at the start of main() in the slave code.
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