以下是我在DSP2812PCI運動控制卡中用的Simulink仿真讀寫硬件的S-function動態鏈接庫源程序：

/*
* File : F2812_EVA.c
* Abstract:
*       An example C-file S-function for write cmpr to DSP2812,
* Date : 2007.12.02
*
* Real-Time Workshop note:
*   This file can be used as is (noninlined) with the Real-Time Workshop
*   C rapid prototyping targets, or it can be inlined using the Target 
*   Language Compiler technology and used with any target. See 
*     matlabroot/toolbox/simulink/blocks/tlc_c/timestwo.tlc   
*     matlabroot/toolbox/simulink/blocks/tlc_ada/timestwo.tlc 
*   the C and Ada TLC code to inline the S-function.
*
* See simulink/src/sfuntmpl_doc.c
*
* Copyright 1997-2007 TH, Inc.
* $Revision: 1.0 $
*/


#define S_FUNCTION_NAME test
#define S_FUNCTION_LEVEL 2

#define PCI_T1PR(S)         ssGetSFcnParam(S, 0)
#define PCI_T1CON(S)        ssGetSFcnParam(S, 1)
#define PCI_DBTCONA(S)      ssGetSFcnParam(S, 2)

/* Parameters */

#include "simstruc.h"
#include "windows.h"
#include "THRMCM.h"

static BOOL bOpen = FALSE;
static WORD T1PR =0;
static WORD T1CON =0;
static WORD DBTCONA =0;

/*================*
* Build checking *
*================*/


/* Function: mdlInitializeSizes ===============================================
* Abstract:
*   Setup sizes of the various vectors.
*/
static void mdlInitializeSizes(SimStruct *S)
{
int_T   i;
    ssSetNumSFcnParams(S, 3); /* Number of expected parameters */
    if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) {
        return; /* Parameter mismatch will be reported by Simulink */
    }

    if (!ssSetNumInputPorts(S, 3)) return;    /* Input Ports */

for (i = 0; i < 3; i++) {
            /* snip */
    ssSetInputPortWidth(S, i, 1);
    ssSetInputPortDirectFeedThrough(S,i,1);
/*   ssSetInputPortRequiredContiguous(S,i,1); // 加了這條語句就不能執
                                       行取端口數據及其后面的代碼 */
        }

T1PR = (WORD) mxGetPr(PCI_T1PR(S))[0];
T1CON = (WORD) mxGetPr(PCI_T1CON(S))[0];
DBTCONA = (WORD) mxGetPr(PCI_DBTCONA(S))[0];

if (!ssSetNumOutputPorts(S,0)) return;

    ssSetNumIWork(S, 1);
ssSetNumSampleTimes(S, 1);
    /* Take care when specifying exception free code - see sfuntmpl_doc.c */
    ssSetOptions(S,
                 SS_OPTION_WORKS_WITH_CODE_REUSE |
                 SS_OPTION_EXCEPTION_FREE_CODE|
                 SS_OPTION_USE_TLC_WITH_ACCELERATOR);
if (!bOpen)
{
   bOpen = Init2812Card();
   if(!bOpen) 
   {
    return;
   }
   order_code_write(1);
   t1pr_write(T1PR);
   t1con_write(T1CON);
   dbtcona_write(DBTCONA);
}
}


/* Function: mdlInitializeSampleTimes =========================================
* Abstract:
*    Specify that we inherit our sample time from the driving block.
*/
static void mdlInitializeSampleTimes(SimStruct *S)
{
    ssSetSampleTime(S, 0, INHERITED_SAMPLE_TIME);
    ssSetOffsetTime(S, 0, 0.0);
}


/* Function: mdlOutputs =======================================================
* Abstract:
*    y = 2*u
*/
static void mdlOutputs(SimStruct *S, int_T tid)
{
// int_T             i;
WORD cmpr1=0;
WORD cmpr2=0;
WORD cmpr3=0; 
InputRealPtrsType uPtrs0 = ssGetInputPortRealSignalPtrs(S,0);
InputRealPtrsType uPtrs1 = ssGetInputPortRealSignalPtrs(S,1);
InputRealPtrsType uPtrs2 = ssGetInputPortRealSignalPtrs(S,2);

cmpr1 = (WORD)(*uPtrs0[0]);
cmpr2 = (WORD)(*uPtrs1[0]);
cmpr3 = (WORD)(*uPtrs2[0]);

// for (i=0; i<Width; i++) {
        /*
         * This example does not implement complex signal handling.
         * To find out see an example about how to handle complex signal in 
         * S-function, see sdotproduct.c for details.
         */

// mexPrintf("uPtrs2=%f\n",*uPtrs0[2]); //調試測試用
order_code_write(2);
cmpr1_write(cmpr1);
cmpr2_write(cmpr2);
cmpr3_write(cmpr3); 
// }
}


/* Function: mdlTerminate =====================================================
* Abstract:
*    No termination needed, but we are required to have this routine.
*/
static void mdlTerminate(SimStruct *S)
{
if (bOpen)
{
   order_code_write(0);
   Exit2812Card();
}

}


#ifdef MATLAB_MEX_FILE    /* Is this file being compiled as a MEX-file? */
#include "simulink.c"      /* MEX-file interface mechanism */
#else
#include "cg_sfun.h"       /* Code generation registration function */
#endif