MATLAB: ERT code generation customization

Embedded Coderert

I want to customize the code generated by ERT target, but i dont know where to start. One of my customization requirement is — ERT packs the external inputs & outputs in structure in generated code as below
/* External inputs (root inport signals with auto storage) */
typedef struct {
  uint8_T U8_Num1;                     /* '<Root>/U8_Num1' */
  uint8_T U8_Num2;                     /* '<Root>/U8_Num2' */
} ExternalInputs_cmp;
/* External outputs (root outports fed by signals with auto storage) */
typedef struct {
  uint16_T U16_ProductOut;             /* '<Root>/U16_ProductOut' */
  boolean_T B_CompRes;                 /* '<Root>/B_CompRes' */
} ExternalOutputs_cmp;
I want to use external ips and ops names (eg. U8_Num1 and U8_Num2) as global variable in my code. So generated code should process them as it is
        uint8_T U8_Num1;                     /* '<Root>/U8_Num1' */
        uint8_T U8_Num2;                     /* '<Root>/U8_Num2' */
I want to know which TLCs should be modified and how? Can someone help? Thanks.

Best Answer

You shouldn't need to modify TLC files to do this. You only have to specify the right storage class for your input/output signals. See Interfacing Signals to External Code for documentation.
Here's what you should do:
  1. Right click on an input/signal signal (make sure you click on the signal - not inport/outport block)
  2. Select "Signal Properties"
  3. In the dialog window, enter a name (eg. U8_Num1) for "Signal Name"
  4. In the "Code Generation" tab, select storage class as ImportedExtern or ExportedGlobal (for ImportedExtern, you need to provide a header with the declarations)
  5. The generated datatype is the same as the one specified on the inport/outport block
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