Addi-Data ADDINUM CPCI-1500 Technical Description page 70

Technical description
User interrupt routine can be called :
- directly by the driver interrupt routine (Synchronous mode). The code of the
user interrupt routine directly operates in ring 0.
- by the driver interrupt thread (Asynchronous mode). An event is generated
and the interrupt thread calls up the user interrupt routine. The code of the user
interrupt routine operates in ring 3.
The driver interrupt thread have the highest priority (31) from system.
Synchronous mode
Driver interrupt
User interrupt
ADVANTAGE
RESTRICTION
Chapter 9
routine
routine
The code of the user interrupt routine is directly called by driver interrupt
routine (ring 0). The time between interrupt and the user interrupt routine is
reduced.
The user cannot debug the user interrupt routine.
The user routine cannot call Windows API functions.
The user routine cannot call functions which give access to global variables.
The user can still use a shared memory.
The user routine can only call xPCI-1500 driver functions with the
following extension "i_APCI1500_KRNL_XXXX"
This mode is not available for Visual Basic
Driver interrupt
Event
routine
SYNCHRONOUS-MODE
APCI-/CPCI-1500
Asynchronous mode
Driver interrupt
thread
User interrupt
routine
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