How to unpack data with Byte Unpacking

Hello,

I would be happy if somebody could explain to me how to set the parameter properly in the Byte Unpacking block.

I am using Simulink Real-time, where the communication is going through a TCP socket. From TCP Receive block the data is unpacked into uint8 (which is the setting for default). I need to unpack the data via Byte Unpacking with int16. Could somebody tell me please what I have to put as the output dimension for int16?

In the attachment, I send the model to clarify the model vision.

Answer 1

[Dimitri MANKOV]

Hi Inna,

The "Output port dimension" parameter defines the size of the outputs produced by the "Byte Unpacking" block, as explained in the documentation. For example, suppose you receive a vector of 15 uint8 packets as an input, and you know that these packets contain the following signals:

• 2x single (2x 32 bits / 2x 4 bytes)
• 3x int16 (3x 16 bits / 3x 2 bytes)
• 1x uint8 (1x 8 bits / 1x 1 byte)

You would configure the "Byte Unpack" block as follows:

• Output data type: {['single'], ['int16'], ['uint8']}
• Output dimension: {[2],[3],[1]}

This would generate 3 output ports for the "Byte Unpacking" block, the first being a vector of 2 single values, the second a vector of 3 int16 values and the third a uint8 signal.

In your case, you go from uint8 to int16, so the output dimension in your case would be the input dimension divided by 2.

I hope this is helpful!

Dimitri