struct memeber can not be Simulink.Parameter?

2021 7 29
3 个回答
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更新时间：2024 9 13
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1 个投票

hi,
I am using HDL Coder to generate RTL code from simulink.
While I want some signal internal a simulink to be tunable, which names 'bp' for example. So I wrote following code:
bp = Simulink.Parameter;
bp.Value = [0;0;0];
bp.CoderInfo.StorageClass = 'ExportedGlobal';
Then the bp signal will appeared as a input port in RTL.
However, if I wrote like this:
reg.bp = Simulink.Parameter;
reg.bp.Value = [0;0;0];
reg.bp.CoderInfo.StorageClass = 'ExportedGlobal';
While generate RTL, it comes out error:
Invalid setting in '<some_block>' for parameter 'Value'.
error using slhdlcoder.SimulinkConnection/initModel
Expression 'reg.bp' for block '<some_block>' returns a Simulink.Parameter object that has property values that need to be evaluated. This object should be instantiated in a workspace and referenced by name in Simulink
So it seems struct member can not be simulink parameter?

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Parker
Parker 2024-9-11
I hope the Mathworks team will revisit this question and give an explanation for why this is not allowed. I have run into the same thing, where our team would like to store our parameters in a structure and use them in constant and gain blocks in our model, but Mathworks appears to have disallowed this starting with MATLAB r14sp3, per this older question

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 采纳的回答

Shivam Malviya
Shivam Malviya 2024-9-13

1 个投票

Hi,
It appears that during the RTL code generation for the attached model, you are encountering the mentioned error due to the use of a struct variable with a field that is a Simulink.Parameter. In your use case, struct variables are necessary to bundle all the global tunable parameters together.
The current initialization of the `reg` variable is causing Simulink model compilation failure, which leads to an error during RTL code generation. To resolve this issue, please follow these steps:
  • Instead of setting the field as a Simulink.Parameter, set the top-level struct as a Simulink.Parameter.
  • Ensure that the appropriate bus object is set for the struct object of type Simulink.Parameter.
Below is the updated demo_param.m script, which correctly initializes the reg variable:
% Initialize the required value
thr_val = [5;6;7];
reg_val = struct('thr', thr_val);
% Create appropriate bus object
Simulink.Bus.createObject(reg_val);
regType = slBus1;
clear slBus1
% Create the Simulink.Parameter object
reg = Simulink.Parameter(reg_val);
reg.DataType = 'Bus: regType';
reg.CoderInfo.StorageClass = 'ExportedGlobal';
% Set required variables
DT_cnt = fixdt(0,8,0);
ts = 0.1;
However, input ports won't get generated in the RTL code for this scenario involving struct as a Simulink.Parameter.
For more details, please refer to the following documentation pages:
Best Regards,
Shivam Malviya

更多回答（2 个）

Kiran Kintali
Kiran Kintali 2021-8-1

0 个投票

Can you share a sample model?

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dayu lai
dayu lai 2021-8-5
Hi, I use the same demo in other question
https://ww2.mathworks.cn/matlabcentral/answers/888157-how-to-assign-the-name-of-a-multiple-port-while-using-hdl-coder-generate-rtl-from-simulink?s_tid=prof_contriblnk
The demo above can generate RTL successfully. However, if I change the parameter of constant before comparator into structure memeber. The compile of MDL is fail.
See the attached png for detail.
In reality, there will be a lot of tunable value in my design. I just want them to be members of structure, like reg.tunable_value0, reg.tunable_value1 and etc. Otherwise my workspace would be full filled with the global tunable value.
How I can do it?
Parker
Parker 2024-9-11
I would love for an explanation from Mathworks about why this method of storing parameters is not allowed by Simulink

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