Silicon Laboratories Stepper Machine Bedienungsanleitung PDF herunterladen (Seite 32)

AN428

32 Rev. 0.6

}

else {} // If this transfer is a READ,

// then take no action. Slave

// address was transmitted. A

// separate 'case' is defined

// for data byte recieved.

}

else // If slave NACK,

{

if(SMB_ACKPOLL)

{

STA = 1; // Restart transfer

}

else

{

FAIL = 1; // Indicate failed transfer

} // and handle at end of ISR

}

break;

// Master Receiver: byte received

case SMB_MRDB:

if ( i < SMB_DATA_LEN ) // Is there any data remaining?

{

*pSMB_DATA_IN = SMB0DAT; // Store received byte

pSMB_DATA_IN++; // Increment data in pointer

i++; // Increment number of bytes received

ACK = 1; // Set ACK bit (may be cleared later

// in the code)

}

if (i == SMB_DATA_LEN) // This is the last byte

{

ACK = 0; // Send NACK to indicate last byte

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Keine Kommentare

Silicon Laboratories Stepper Machine Bedienungsanleitung Seite 32