Silicon Laboratories Stepper Machine User Manual download pdf (Page 33)

AN428

Rev. 0.6 33

// of this transfer

STO = 1; // Send STOP to terminate transfer

SMB_BUSY = 0; // Free SMBus interface

}

break;

default:

FAIL = 1; // Indicate failed transfer

// and handle at end of ISR

break;

}

if (FAIL) // If the transfer failed,

{

SMB0CF &= ~0x80; // Reset communication

SMB0CF |= 0x80;

STA = 0;

STO = 0;

ACK = 0;

FAIL = 0;

SMB_BUSY = 0; // Free SMBus

}

SI = 0; // Clear interrupt flag

}

//-----------------------------------------------------------------------------

// Timer2 Interrupt Service Routine (ISR)

//-----------------------------------------------------------------------------

// A Timer2 interrupt indicates an SMBus SCL low timeout.

// The SMBus is disabled and re-enabled if a timeout occurs.

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Silicon Laboratories Stepper Machine User Manual Page 33