Hi,
I understand that you are trying to generate C code with Simulink coder for a S-function with int64 input and output, but you are getting an error regarding data type while doing so. The steps below can help you solve the error:
- As you mentioned, Simulink doesn't support int64 or uint64 as built-in data types for S-functions and you have to register them for using them as outports, inports or states. You can use the following commands to register int64 or uint64:
DTypeId dtId_Int64 = ssRegisterDataTypeInteger(S,1,64,0);
DTypeId dtId_Uint64 = ssRegisterDataTypeInteger(S,0,64,0);
And then use themto specify inport and outport:
ssSetInputPortDataType( S,0,dtId_Int64); // 1st input port uses int64
ssSetOutputPortDataType(S,1,dtId_int64); // 1st output port uses int64
Refer to the following link on more information on data type IDs: https://www.mathworks.com/help/fixedpoint/ug/data-type-ids.html
2. In addition to that, you have to also include the header files mentioned below for using 64 bit integers:
#include "simstruc.h"
#include "fixedpoint.h"
The following link will help you create the structure of a S-function which uses fixed point data types:
3. While mexing you have to pass an extra argument :
mex('your_sfun_file.c','-lfixedpoint')
In case of any issues while doing this set up, you may refer to the following answer:
