User manual

Chapter 4: PowerDAQ Software (SDK)

Method B. Buffered event-based waveform

mode using PCI interrupts

See SDK Examples AOEvents.c, AEOutBlk.vbp

Buffered event-based waveform mode allows you to generate any

continuous waveforms. When the on-board output FIFO is less than

half full, the board sends an interrupt to the host to request additional

data. You can process analog output events in a separate event handler

or in the common event handler for all subsystems.

Initialization

Reset analog output

# _PdAOutReset(…)

• Set analog output configuration

# _PdAOutSetCfg(…)set dwConfig =

AOB_CVSTART0 to use 11 MHz internal base clock.

• Set timebase

# _PdAOutSetCvClk(…)use the same calculations to

set up the timebase as it was described in the

analog input subsystem

• Set up event object

# _PdAOutSetPrivateEvent(…)

• Enable interrupt

# _PdAdapterEnableInterrupt(…)

• Set events to be notified about

# _PdSetUserEvents(…) set dwEventsNotify =

eFrameDone | eBufferDone | eBufferError |

eStopped. These are all events needed for event-

based waveform mode. Do not forget the

subsystem = AnalogOut

• Write the first block of data

# _PdAOutPutBlock(…)