Programmatically get propagated datatype of a block

I am trying to get a block propogated datatype when the output datatype is selected to inherit. I know we can use get_param to get datatype setting but I am interested in getting datatype a block outputs post update model (Ctrl+D).

I have a model with fixed point datatypes where some of the blocks are inheriting the datatype. I want to pin-point which block is using a perticular word length post propogation.

Answer 1

[Andy Bartlett]

Hi,

The attached function provides an example of how to use Simulink API's to get data type information from signals and run-time parameters.

This can be run like so.

mdl = 'fxpdemo_feedback'; 
open_system(mdl); 
[cellDts,cellDtStrs,rootOutCellDts,rootOutCellDtStrs,S] = find_all_dt_io(mdl)

You can see the list of data types detected as numerictype objects or as strings. Here is an example of seeing the string names used by Simulink.

S.cellDtStrs
ans =
  1×5 cell array
    {'double'}    {'sfix16_En14'}    {'sfix16_En5'}    {'sfix32_En12'}    {'sfix8_En4'}

To see where a particular data type was detected, you can use the data type name as a field name for the last function output argument.

S.sfix16_En14
ans = 
  struct with fields:

    ntStrML: 'numerictype(1,16,14)'
    ntStrSL: 'fixdt(1,16,14)'
         nt: [1×1 embedded.numerictype]
    RtParam: {1×2 cell}
     Inport: {'fxpdemo_feedback/Controller/Numerator Terms'}
    Outport: {'fxpdemo_feedback/Controller/Up Cast'}    

That data type was used as an input to one block and the output from another block.

The data type was also used with Run-Time parameters of two blocks.

    S.sfix16_En14.RtParam
ans =
  1×2 cell array
    {'fxpdemo_feedback/Controller/Denominator…'}    {'fxpdemo_feedback/Controller/Numerator T…'}

You can look inside

edit find_all_dt_io

to see what it's doing. It's using the techniques that Fangjun Jiang mentioned. Plus, getting the Run-Time Parameter information.

Regards,

Andy

[Niravkumar Ambaliya]

Thank you Andy

Answer 2

[Fangjun Jiang]

Something like

model([], [], [], 'compile')
get_param('BlockPath','CompiledDataType')
model([], [], [], 'term')

You can use this to get all the compiled data types and then search for a paticular data type string.

see https://www.mathworks.com/help/simulink/slref/model_cmd.html