DDC Reference Sample Code : bcdemo_wordincrement   Download 

This sample demonstrates a technique to setup aceXtreme boards to auto increment a data word value of a specific message using ACE_OPCODE_INC opcode.

1. Overview

• The sample schedules one BC->RT message to be transmitted very 500uS with the value of Data Word 0 & 1 (i.e. a pair of 16-bit words treated as one 32-bit value) being incremented by 1 in successive transmissions of this message.
• It creates a Memory Object on the first Data Block of this message and adds an ACE_OPCODE_INC opcode on this memory object.
• After transmission of this message in every cycle, the ACE_OPCODE_INC opcode gets executed which will internally increment the value of word 0 of the data block without the need for software intervention. Once word 0 overflows, the incrementing continues on word 1 since this technique works on 32-bit values. This upcounting goes on for up to 2power32.
• Since the increment is done by the 1553 hardware, it is highly reliable even for messages having short periodicity where software techniques of incrementing data words becomes unliable.
• The same technique can be used to decrement the value of data words as well by using the ACE_OPCODE_DEC opcode. It may also be extended to increment/decrement values of multiple words across messages.
• This sample requires an aceXtreme 1553 hardware from DDC.

2. APIs Demonstrated

• aceInitialize
• aceBCInstallHBuf
• aceBCDataBlkCreate
• aceBCMsgCreateBCtoRT
• aceBCOpCodeCreate
• acexBCMemObjCreate
• aceBCFrameCreate
• aceBCStart
• aceBCStop
• aceFree

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-67103U200L-JL0.