Owner's manual

Chapter 4: PowerDAQ Software

AIB_FIXEDDMA – use fixed channel list mode (1/2/4/8 channels

only), input mode, default.

AOB_DMAEN – use fixed channel list mode (1/2/4/8 channels only),

output mode, default, must be part of the configuration word for the

_PdDOAsyncInit call.

Following steps are required for the event-based mode:

• Acquire all resources

• Open Driver

• Open Adapter

• Acquire Digital Input and/or Digital Output Subsystem

• Acquire Buffer

• Enable desired ports as an outputs

• Configure the events (eFrameDone/eBufferDone and all error

events must be reported)

• For the output – fill the buffer with initial data

• Enable I/O

• Process the data in event-based loop

• Wait for the event to happens if interrupts are used

• Check the event and, if data is available (or more space in the

output buffer)

• Read/Write data to/from the buffer

• Re-enable events

• Release all resources used

• Release Buffer

• Close subsystem

• Close Adapter

• Close driver

Following examples are supplied with PowerDAQ SDK 3.x which

supports various input/output buffered modes :

pddi_buf.c - digital input stream (-ST boards only)

pddo_buf.c - digital output stream (-ST boards only)