Andy Bartlett

Last seen: 4 days ago | Active since 2015

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How to remain the bits of input signal port unchanged after using fixed-point tool?
LockScale prevents changes by Fixed-Point Tool Often some signals and parameters in a model are mandated early in the design pr...

11 days ago | 0

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Answered
Is it possible to disable compiling before simulating in Simulink?
Simulink Fast Restart is exactly what you want (assuming you are not making structural changes to your model between simulations...

1 month ago | 2

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Nonlinear plant in simulink
The key is to model Y(k+1) to Y(k) using a unit delay. The output of the unit delay is the input value from one time step earl...

1 month ago | 0

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Mask parameter value is ignored with HDL Counter word length
Model Reference is not compatible with what you are trying to do. As an alternative, consider creating a Simulink library and pu...

2 months ago | 1

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help required for fixed point conversion
Mapping an A2D to a fixed-point data type One way to map an A2D converter to a fixed-point data type is to use two real-world-v...

2 months ago | 0

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help required for fixed point conversion
The number 395 is how many times that block in the model overflowed during the previous simulation. Suppose the element was a da...

2 months ago | 0

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help required for fixed point conversion
Hi Gary, That portion of your model will involve 4 data types. Digital measurement of output signal from analog plant Set poi...

2 months ago | 0

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Overflows when I use Fixed-Point Tool
Two Kinds of Overflows Fixed-Point Tool presents two types of overflows, Actual and Potential. Actual Overflows Actual overfl...

2 months ago | 0

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Answered
Problem with Simulink.NumericType after AUTOSAR-XML (ARXML) import
To simulate the model with the fixed-point data types and see bit-true behavior will require a Fixed-Point Designer license. Ho...

2 months ago | 0

Answered
Can we replace parameter value with parameter name while generating C code from model?
Please see the documentation Macro Definitions (#define) - MATLAB & Simulink (mathworks.com)

2 months ago | 0

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Am I missing something, or is the Tip wrong?
Hi, The advise is generally correct. Turning off Integer Saturation and allowing the math to wrap modulo 2^N will lead to lea...

2 months ago | 1

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Answered
Why is my Simulink data type randomly changing?
Yes, this is most likely due to attribute propagation. You likely have an underspecified "chicken and egg loop" in your model. T...

2 months ago | 1

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What is the efficient code?
Simple Ansewer: Use shift approach unless multiplicative constant is really big In my experience, the multiply by constant foll...

2 months ago | 0

Answered
Method of Real number multiplication operation
Quick Answer: Shifts are Multiply or Divide by a Power of Two Shift left of M bits is equivalent to multiplication by 2^M wh...

3 months ago | 0

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Answered
Trouble using fixed point type conversion in Simulink
Check rounding and overflow handling mode By default, the Data Type Conversion block rounds to Floor and Wraps overflows. In c...

3 months ago | 0

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Answered
What is the "net slope"
Net slope is used in fixed-point operations to achieve agreement of scaling. The slopes of all the variables involved in an oper...

3 months ago | 0

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Answered
Simulink model converts floating-point numbers to fixed-point numbers
Suggestion consider using modByConstant Since the "denominator" of your modulos are constants, you my wish to use the modByCons...

3 months ago | 0

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Simulink model converts floating-point numbers to fixed-point numbers
By default zeros() gives double Your output is double because of how it is initialized with the zeros() function n = 3; m = 4...

3 months ago | 0

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Answered
Data type conversion changes the value of the signal
Why cast to single has large quantization error. The cast from fixed-point to single will use single precision for constants an...

4 months ago | 0

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Answered
Data type conversion changes the value of the signal
Brief answer The original value 0.1 is between two representable values (0.099609375 and 0.1005859375) of the type being quanti...

4 months ago | 0

Answered
Time delay threshold for constant output
I suggest you start by writing down on paper the equations or pseudo code that you think will solve the requirements of your pro...

4 months ago | 0

Answered
Error in Divide Block - System Generator
The System Generator is a Simulink add-on product developed by AMD (Xilinx). The data types mentioned in the error message, Fix...

4 months ago | 0

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Answered
Remainder of a division operation in System Generator
Consider restructuring your design to work in units of revolutions instead of in degrees. In that case you only need to perform ...

4 months ago | 0

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Answered
Simulink Moving Average block not averaging according to the window length specified
Hi Shani, Please create a simplified model that exercises the Moving Average Block in isolation. Create a test input sequence...

4 months ago | 0

Answered
Floating-Point to Fixed-Point Conversion of IIR Filters
Hi, Examples often depend on supporting files. To successfully run these examples, all the files needed by the example need to ...

5 months ago | 0

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FAQ: Why does a value look more precise when displayed in MATLAB or Simulink than in the generated code?
Textual Representation is Often an Approximation The textual representation of values displayed in MATLAB and Simulink is ofte...

5 months ago | 0

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Answered
Which block's fixed format will be optimized firstly in Fixed-Point tool？
Hi Lin, The optimization proceedure used by Fixed-Point Tool Optimization Conversion workflow is not designed to be determinist...

6 months ago | 0

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Answered
Simulink ADD block keeps returning 255
My guess is that Sum block's output data type is uint8, and the block is configured to wrap on integer overflows. So the output...

6 months ago | 0

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n-D Lookup Table dimension error
There are two issues. For simplicity, I'll assume the block is configured to do linear interpolation and extrapolation. First,...

6 months ago | 1

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Answered
How to read and write to an upper half or a specific bit from a decimal number in Simulink?
Bitwise AND, OR, XOR, NOT (aka complement), shift, ... are the ways commonly used to set, clear, or otherwise manipulate bits ...

6 months ago | 1

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Andy Bartlett

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