TWI - why no stop sometimes

[alank2]

I've got a couple of AVR's using their TWI interface to talk to each other.

ISSUE # 1 - In TWI1.png below, it has a stop/start, but in TWI2.png below, I did not get the stop?  It is the same code run again and again.

Code: [Select]

      case TWI_MTX_ADR_ACK: //0x18
      case TWI_MTX_DATA_ACK: //0x28
        //do we have more to send?
        if (TWIPos<PROTOCOL_SIZE)
          {
            //yes, transmit byte
            TWDR=RxBuffer[TWIPos++];
            TWCR=_BV(TWEN) | _BV(TWIE) | _BV(TWINT);
          }
        else
          {
            //send stop
            TWCR=_BV(TWEN) | _BV(TWINT) | _BV(TWSTO);
            TWIState=TWISTATE_SENT;
          }
        break;

ISSUE # 2 - Also in TWI1.png I put a square around a glitch that shows up in many of the bytes sent to the slave.  I don't think it affects anything, but is this when one device is turning off and allowing the other to ack/nak it?  I see this tiny little glitch on many of the tx bytes.  Actually it is on the RX bytes too.  Happens during the fall of the clock though and I only think it is sampled on the rise.