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I2C almost running

 
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rudy



Joined: 27 Apr 2008
Posts: 168

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I2C almost running
PostPosted: Sat Feb 20, 2010 6:25 pm     Reply with quote
Hi everybody, I need a little help to finalize my I2C routine. The problem happens when I try to read the slave, the master receive all bytes, but the slave keeps waiting ACK after the last transmitted byte. How do I solve this?

MASTER ASKS:
Code:

void i2c_rx(address)
   {
   deb=1;
    i2c_start();
                i2c_write(address+1);                     
                data0=i2c_read();
                data1=i2c_read();
                data2=i2c_read();
                data3=i2c_read();
                data4=i2c_read(0);
                i2c_stop();
                }

SLAVE ANSWERS:
Code:

#INT_SSP
void SSP_isr()
     { 
     if(sspstat_rw==1)  //BACK TO MASTER TRANSMITER
        {
         i2c_write(0);
         i2c_stop();
         i2c_write(1);
         i2c_stop();
         i2c_write(2);
         i2c_stop();
         i2c_write(3);
         i2c_stop();
         i2c_write(4);
         }
    else
        {       
        if(sspstat_da==1)  //RECEIVED DATA
             {
              aux_rx++;
              buffer_rx[aux_rx]=i2c_read();                   
              if(aux_rx==0x04)flag_0=1;
              }
        else
             {
              address=i2c_read(); //ADDRESS RECEIVE
              aux_rx=0xff;
              }
         }
   }   
 

Works really fine, the problem is that, when RW=1, the master receives all data, but no ACK is returned. The BUS stay locked.

Please help me.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Feb 21, 2010 2:13 pm     Reply with quote
This post has sample i2c code that reads multiple bytes:
http://www.ccsinfo.com/forum/viewtopic.php?t=39565&start=4
rudy



Joined: 27 Apr 2008
Posts: 168

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PostPosted: Sun Feb 21, 2010 6:08 pm     Reply with quote
Thanks Sr.

I already solved the problem.
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