VXI VT1433B - Manual (Page 72)

VT1433B Interrupt Behavior
Interrupt Setup
For an example of interrupt handling see the program event.c in the examples
directory.
The VT1433B VXI module can be programmed to interrupt a host computer
using the VME interrupt lines. VME provides seven such lines. Using
hpe1432_setInterruptPriority, the VT1433B module can be set up to use any one
of them.
The VT1432A can interrupt the host computer in response to different events.
Use hpe1432_setInterruptMask to specify a mask of events on which to interrupt.
This mask is created by OR'ing together the various conditions for an interrupt.
The following table shows the conditions that can cause an interrupt:
Interrupt Mask Bit Definitions
Define (in e1432.h) Description
HPE1432_IRQ_BLOCK_READY Scan of data ready in FIFO
HPE1432_IRQ_MEAS_ERROR FIFO overflow
HPE1432_IRQ_MEAS_STATE_CHANGE Measurement state machine changed state
HPE1432_IRQ_MEAS_WARNING Measurement warning
HPE1432_IRQ_OVERLOAD_CHANGE Overload status changed
HPE1432_IRQ_SRC_STATUS Source channel interrupt
HPE1432_IRQ_TACHS_AVAIL Raw tach times ready for transfer to other modules
HPE1432_IRQ_TRIGGER Trigger ready for transfer to other modules
VT1433B Interrupt Handling
To make the VT1433B module do the interrupt, both a mask and a VME
Interrupt line must be specified, by calling hpe1432_setInterruptMask and
hpe1432_setInterruptPriority respectively. Once the mask and line have been set
and an interrupt occurs, the cause of the interrupt can be obtained by reading the
HPE1432_IRQ_STATUS_REG register (using hpe1432_getInterruptReason). The
bit positions of the interrupt mask and status registers match so the defines can be
used to set and check IRQ bits.
VT1433B User's Guide
Using the VT1433B
3-34