User`s manual

70 Application Hints

PCIS-DASK

Digital Output Programming Hints

Asynchronous Continuous Digital Output

This section describes the function flow typical of asynchronous

digital output operation. While performing continuous DO opera-

tion, the DO configuration function has to be called at the begin-

ning of the application. In addition, the SyncMode argument in

continuous DO functions for asynchronous mode has to be set to

ASYNCH_OP.

Example code fragment:

DO_XXXX_Config

(XXXX = card type)

DO_ContWritePort

With SyncMode = SYNCH_OP

Operation

completed?

YES

DO_AsyncCheck

card = Register_Card(PCI_7200, card_number);

…

DO_7200_Config(card, TRIG_INT_PACER, OREQ_DISABLE,

OTRIG_LOW);

DO_ContWritePort(card, 0, DoBuf, count, 1,

(F64)sample_rate, ASYNCH_OP);

do {

DO_AsyncCheck(card, &bStopped, &count);

} while (!bStopped);

DO_AsyncClear(card, &count);

…

Release_Card(card);