DDC Reference Sample Code : mtiirq   Download 

This sample demonstrates using MTi mode in Multi-function boards to generate an interrupt on matching the command word in received messages.

1. Overview

• This sample uses Triggers with MTi mode for command word match and links the ACEX_TRG_EVENT_INTERRUPT event to the trigger.
• General Purpose Trigger 1 and 2 are used to demonstrate comparison of two command words. This may be extended to up to 16 command words.
• Upon receipt of a message with a matching command word, the board raises an interrupt that is handled by an interrupt service routine.
• The ISR obtains the source of interrupt by reading the trigger status and IRQ status using acexTRGGetStatus and prints an appropriate message.
• The sample may be extended to perform data word matching instead of command word.
• To test this sample, two DDC 1553 boards are needed. One, to run this sample as an MTi which must be a multi-function card and another to generate the BC traffic (this may be a single function board as well).

2. APIs Demonstrated

• aceInitialize
• aceGetHwVersionInfo
• aceMTIConfigure
• acexTRGReset
• aceSetIrqConditions
• aceMTIStart
• aceMTIStop
• aceFree
• acexTRGEventSelect
• acexTRGConfigure
• acexTRGEventEnable
• acexTRGEnable

3. Build and Test Details

The sample was built and tested using Visual Studio 2022 on on Windows 11. BU-69092S0-110 v4.9.5 was used with BU-67202U as MTi and BU-67103U as BC.