ERT code generation customization

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.

Answer 1

[Kaustubha Govind]

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

[TAB]

Thanks,

[Naini Dawar]

how can we create local variables. I need the variable to be declared locally in the same function rather than being the extern.

[Guilherme T Silva]

You can try the Localizable storage class:

Generate Local Variables with Localizable Custom Storage Class