MATLAB: Subsystem with x output bytes

simulinksubsystem

Hi,

I created an enabled subsystem. In this subsystem the inport and the outport are connected directly. I want to control the subsystem so that only x input bytes are passed through. How can I create such a control signal?

Thanks Senmeis

Best Answer

You can place your subsystem inside an Enabled Subsystem which is enabled only for the duration of time that 'x' samples pass through.

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Actually, I think I figured out what I needed to do. So I declared x as global and found the data store memory block. After I found the block I found http://www.mathworks.com/help/simulink/ug/using-global-data-with-the-matlab-function-block.html#bsdud7d-1 Thank you very much for your time and interest in helping me.

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'.
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MATLAB: Is the variable not staying updated in Simulink

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

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