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Verification of sample code required


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Hi Peter,

I am currently writing software for some modules I have created, which are the ADF, COM, NAV avionics.

I have just finished the ADF coding which works perfect and I am now finalizing the COM radio code, but I have run into some problems unfortunately. The transfer button works flawlessly but I cant seem to write to the standby section of the radio frequency for some reason.The COM module does indeed read what is displayed in FSX.

FS verson: FSX

FSUIPC version: 4.32

FS Service Packs: SP1 & SP2

Here is a section that I used for writing to FS though FSUIPC

uiCOMData = 0;
            uiCOMData |= (InputPacketBuffer[7]<<12);
            uiCOMData |= (InputPacketBuffer[8]<<8);
            uiCOMData |= (InputPacketBuffer[9]<<4);
            uiCOMData |= InputPacketBuffer[10];

            //send COM1 Freq
            FSUIPC_Write(0x034E, 2, &uiCOMData, &dwResult);
            FSUIPC_Process(&dwResult); // Process the request(s)

            uiCOMStandbyData = 0;
            uiCOMStandbyData |= (InputPacketBuffer[3]<<12);
            uiCOMStandbyData |= (InputPacketBuffer[4]<<8);
            uiCOMStandbyData |= (InputPacketBuffer[5]<<4);
            uiCOMStandbyData |= InputPacketBuffer[6];

            //send COM1 stby Freq
            FSUIPC_Write(0x311A, 2, &uiCOMStandbyData, &dwResult);
            FSUIPC_Process(&dwResult); // Process the request(s)

            uiCOMTFRData = 0x0008;    //swap radios COM1

            FSUIPC_Write(0x3123, 1, &uiCOMTFRData, &dwResult);
            FSUIPC_Process(&dwResult); // Process the request(s)

Any help Peter on this matter would be greatly appreciated.

Kind regards


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I cant seem to write to the standby section of the radio frequency for some reason.

I suspect the data you are trying to send isn't valid. FSX ignores invalid values. Maybe your frequencies include the leading "1" and your references to characters [3]-[6] should really be [2]-[5], with the ignored "1"s in [1] and [6]? That's my guess.

Please always use the IPC write logging facility to check what is happening. I cannot debug your code here, you need to try using the facilities provided to debug your own programs. If you don't understand the log, show it to me.

Also enable Monitoring on the two COM1 frequency offsets, checking the "normal Log" option. this will then also log the SimConnect calls and responses.

BTW if this is real code, not just some extracts you've put together, it is very inefficient to make three Process calls to do this. You should be sending all the commands (reads and writes) you want in a cycle with one process call.



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  • 1 month later...

Hi Peter,

Yes you were right about FSX reading invalid values, the problem was that, I had simply forgot that the NAV, COM, etc, radios only use a limited bandwidth range. The numbers I was trying to operate were not in that range. Also, thanks for the input about the process clean up code. The sample below was simply a rough guideline to get the firmware operating with FSUIPC. The code was cleaned up later on.

Kind regards


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