Sending/Reeiving binary serial binary data

Question

I am using RPi 3b+ and want to send raw binary data (NOT encoded in any way) via a serial channel.

I can successfully  send and receive ascii string data without a problem (using DataWriter).  But for the life of me, I cannot figure out how to send just plain raw, unencoded hex values.  Looked at BinaryWriter but it wantss to encode everything.  Gad.

Example  0x02 0x00 0x05 0x38 0x82 0x03.  Just a raw binary array.

Using Windows iot, c#, xaml, Visual Studio.

Any help would be greatly appreciated.

Regards to all  - Bob Scott

Answer 1

Hello CVIBob,

You can use DataWriter.WriteBytes() and ReadBytes(). Modify official serial uart sample, use dataWriteObject.WriteBytes instead of dataWriteObject.WriteString.

// Write

                dataWriteObject.WriteBytes(new Byte[] {0x02, 0x00, 0x05, 0x38, 0x82, 0x03});
                // Launch an async task to complete the write operation
                storeAsyncTask = dataWriteObject.StoreAsync().AsTask();

                UInt32 bytesWritten = await storeAsyncTask;


// Read

                loadAsyncTask = dataReaderObject.LoadAsync(ReadBufferLength).AsTask(childCancellationTokenSource.Token);

                // Launch the task and wait
                UInt32 bytesRead = await loadAsyncTask;
                if (bytesRead > 0)
                {
                    var readData = new Byte[bytesRead];
                    dataReaderObject.ReadBytes(readData);
                }

Best regards,

Rita

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Answer 2

Once again Rita, thank you very much!!  Now why didn't I see it??

Ah well - works like a champ!

Regards as always

Bob