MATLAB: Are some of the port labels missing for the generated S-function in Real-Time Workshop 6.0 (R14)

buscreatorgenerateinportinputlabel;s-functionsignalsimulink

I have a Bus Creator block outputting to a subsystem. When I generate an S-function for the subsystem, the input port for the bus signal on the subsystem block is missing its label in the temporary model. However, if I remove the Bus Creator block and regenerate the S-function, the label appears.

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This bug has been fixed in Release 14 Service Pack 2 (R14SP2). For previous releases, there are no workarounds.

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MATLAB: Does Real-Time Workshop 6.0 (R14) include an extra copy of bus signals in a model’s generated code

Simulink requires that atomic subsystems own the memory they output. In part, this defines the system as an atomic unit. Hence, all outputs must originate from blocks inside the atomic subsystem. When an input port feeds its signal directly to an output port in the atomic subsystem, the input port becomes nonvirtual and makes a copy of its input signal. When passing bus signals through atomic subsystems, this rule still applies, and the result is often perceived as unnecessary copies of bus signals in the generated code.

For example, suppose a model has a bus signal with 100 elements. This bus signal is input to an atomic subsystem, where only one of the 100 elements is fed directly from the subsystem's inport to its outport. Consequently, a copy of the entire bus signal (i.e., all 100 bus elements) is included in the generated code, which is quite inefficient compared to copying only the sole direct-feedthrough element. To work around this issue, follow these steps:

1. For each bus signal that connects an atomic subsystem's input port directly to its output port, insert a Signal Conversion block between the two ports.

2. Set the Signal Conversion block's "Output" parameter appropriately:

 * If the block operates on a vector or scalar signal, specify the parameter as 'Contiguous copy'.
 * If the block operates on a bus signal, specify the parameter as 'Bus copy'.

MATLAB: How to set the Parameter Pooling optimization in Real-Time Workshop 6.0 (R14)

As of Real-Time Workshop 6.0 (R14) the Parameter Pooling optimization is automatically turned on when you check the "Inline Parameters" option.

If you set the "Inline Parameters" option to on, parameters which have the same data and are not tunable will be pooled. If you do not use the "Inline Parameter" optimization Real-Time Workshop assumes that every parameter in your model is independently tunable. In this case parameter pooling would not work at all.

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MATLAB: Does Real-Time Workshop 6.0 (R14) include an extra copy of bus signals in a model’s generated code

MATLAB: How to set the Parameter Pooling optimization in Real-Time Workshop 6.0 (R14)

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