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30 July 2014 05:11 AM

turboj Newbie

Total Posts: 2

Joined 0

I use ANT_DLL.dll to interface ANT+ in my Delphi application, and use the N5 Starter kit.

While ANT_DLL.dll allows you to configure Advanced Bursts, they do not appear via CHANNEL_EVENT_FUNC.
The CHANNEL_EVENT_FUNC infrastructure also does not provide you with any idea how much data you actually got - advanced burst packets seem to be the only ones with real variable length (flagged packets still have fixed length for each flag setting). Sou you would have no idea whether a packet is 16 or 24 bytes long.

There is a surprisingly easy workaround for that:
Below code is a section from ANT_DLL\ant.cpp with a simple fix that splits advanced burst packets to normal 8 byte bursts on application level. It does that by setting a flag in ANT_ConfigureAdvancedBurst() functions - you need one of these to activate advanced burst anyway. The splitting code is already in the provided ANT_LIB source code, but just not activated by default.

This is from ant.cpp, line 596ff:

///////////////////////////////////////////////////////////////////////
// Response TimeOut Version 
///////////////////////////////////////////////////////////////////////
extern "C" EXPORT
BOOL ANT_ConfigureAdvancedBurst_RTO(BOOL bEnable_, UCHAR ucMaxPacketLength_, ULONG ulRequiredFields_, ULONG ulOptionalFields_, ULONG ulResponseTime_)
{
   if(pclMessageObject)
   {
      pclMessageObject->SetSplitAdvBursts(true);  //  advanced burst as normal in CHANNEL_EVENT_FUNC
      return(pclMessageObject->ConfigAdvancedBurst(bEnable_, ucMaxPacketLength_, ulRequiredFields_, ulOptionalFields_, ulResponseTime_));
   }
   return(FALSE);
}

///////////////////////////////////////////////////////////////////////
// Stall count version
///////////////////////////////////////////////////////////////////////
extern "C" EXPORT
BOOL ANT_ConfigureAdvancedBurst_ext(BOOL bEnable_, UCHAR ucMaxPacketLength_, ULONG ulRequiredFields_, ULONG ulOptionalFields_, USHORT usStallCount_, UCHAR ucRetryCount_)
{
   return ANT_ConfigureAdvancedBurst_ext_RTO(bEnable_, ucMaxPacketLength_, ulRequiredFields_, ulOptionalFields_, usStallCount_, ucRetryCount_, 0);
}

///////////////////////////////////////////////////////////////////////
// Stall count version with response timeout
///////////////////////////////////////////////////////////////////////
extern "C" EXPORT
BOOL ANT_ConfigureAdvancedBurst_ext_RTO(BOOL bEnable_, UCHAR ucMaxPacketLength_, ULONG ulRequiredFields_, ULONG ulOptionalFields_, USHORT usStallCount_, UCHAR ucRetryCount_, ULONG ulResponseTime_)
{
   if(pclMessageObject)
   {
      pclMessageObject->SetSplitAdvBursts(true); //  advanced burst as normal in CHANNEL_EVENT_FUNC
      return(pclMessageObject->ConfigAdvancedBurst_ext(bEnable_, ucMaxPacketLength_, ulRequiredFields_, ulOptionalFields_, usStallCount_, ucRetryCount_, ulResponseTime_));
   }
   return(FALSE);
} 

Side effects: Advanced burst packets appear to be normal burst in the application, but they are still send over the air (and over USB/serial interface) as advanced with up to 60Kb/sec.

30 July 2014 09:11 AM #1

alejandra Moderator

Total Posts: 662

Joined 2012-10-09

Thanks for contributing this patch!

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ANT_DLL.dll and Advanced Bursts (patch)