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i2C Communication Control

 
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emaxxenon



Joined: 21 Jan 2020
Posts: 42

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i2C Communication Control
PostPosted: Mon Mar 09, 2020 3:12 am     Reply with quote

Hi,
I am communicating with i2C. (pic: 18F25K22)
I have 10 slave cards (5 receiver - 5 transmitter).
The master card sends commands for them to operate ir leds.
But I want to see if the i2C communication is provided with LED.

When I do this way, the led is constantly on.
But if there is mutual communication, I want it to burn.
Is it possible to see mutual communication with LEDs without writing an additional command?
I don't want to send and receive separate information for control.
Code:

//////////////////////////////////////////////////1.SLAVE///////
   if(SW>=0)
   {

      //16 ir leds turn on respectively

      for(int i=0; i<16; i++)
      {
         //Opening the receiver
         i2c_start();
         i2c_write(A_SLAVE1_W);
         i2c_write(i);
         i2c_stop();   

         //Opening the transmitter
         i2c_start();
         i2c_write(V_SLAVE1_W);
         i2c_write(i);
         i2c_stop();
         delay_us(10);
      } 

      //Reading information from the receiver
      i2c_start(); 
      i2c_write(A_SLAVE1_R);
      A1_1 = i2c_read();
      A1_2 = i2c_read(0);
      i2c_stop();

      //i2c communication led
      output_toggle(pin_A0);
      .
      .
      .
   }
///////////////////////////////////////////////////////////////////////////////


Thanks in advance for your answers.
Ttelmah



Joined: 11 Mar 2010
Posts: 15749

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PostPosted: Mon Mar 09, 2020 4:06 am     Reply with quote

Look at the I2C bus scanner program in the code library.

When you send a command to a device that acknowledges it, the master
receives this acknowledge bit. The scanner program identifies that a device
is there and did acknowledge. Allows it to detect what devices are present.
You could use this to detect that the device is there are receiving on the
bus.
emaxxenon



Joined: 21 Jan 2020
Posts: 42

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PostPosted: Mon Mar 16, 2020 1:50 am     Reply with quote

Hello, thanks for answer.

I checked I2C debug.
If the address is incorrect, NAK = 1 appears. If true, 0 appears.
Is there a way to read this lice?
If the address is wrong, I want to turn on the led.

edit:

Code:
i2c_start();
status = i2c_write(address);  // Status = 0 if got an ACK
i2c_stop();

if(status == 0)
   return(TRUE);
else
   return(FALSE);
}


thanks in this way solved.
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