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MPI Application Template
template.c
 

motion1.c -- Perform point to point trapezoidal profile motion.
/* motion1.c */

/* Copyright(c) 1991-2006 by Motion Engineering, Inc.  All rights reserved.
 *
 * This software  contains proprietary and  confidential information  of
 * Motion Engineering Inc., and its suppliers.  Except as may be set forth
 * in the license agreement under which  this software is supplied, use,
 * disclosure, or  reproduction is prohibited without the prior express
 * written consent of Motion Engineering, Inc.
 */

/*

:Perform point to point trapezoidal profile motion.

This is a simple program to demonstrate how to start a trapezoidal profile
 motion on a single axis.  There is a minimal error checking in this sample.

Warning!  This is a sample program to assist in the longegration of an
 MEI motion controller with your application.  It may not contain all
 of the logic and safety features that your application requires.
 
The msgCHECK(...) macros used in the following sample code are intended
 to convey our strong belief that ALL error return codes should be checked.
 Actual application code should use specific error handling techniques (other
 than msgCHECKs) best suited to your internal error recovery methods.

*/

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "stdmpi.h"
#include "stdmei.h"
#include "apputil.h"

#define MOTION_NUMBER   (0)
#define AXIS_NUMBER     (0)

#define GOAL_POSITION   (50000)
#define VELOCITY        (5000)
#define ACCELERATION    (10000)
#define DECELERATION    (20000)


/* Perform basic command line parsing. (-control -server -port -trace) */
void basicParsing(int                    argc,
                  char                  *argv[],
                  MPIControlType        *controlType,
                  MPIControlAddress     *controlAddress)
{
    long argIndex;

    /* Parse command line for Control type and address */
    argIndex = argControl(argc, argv, controlType, controlAddress);

    /* Check for unknown/invalid command line arguments */
    if (argIndex < argc) {
        fprintf(stderr,"usage: %s %s\n", argv[0], ArgUSAGE);
        exit(MPIMessageARG_INVALID);
    }
}


/* Create and initialize MPI objects */
void programInit(MPIControl         *control,
                 MPIControlType      controlType,
                 MPIControlAddress  *controlAddress,
                 MPIMotion          *motion,
                 long                motionNumber,
                 MPIAxis            *axis,
                 long                axisNumber)
{
    long            returnValue;


    /* Create motion controller object */
    *control =
        mpiControlCreate(controlType,
                         controlAddress);
    msgCHECK(mpiControlValidate(*control));

    /* Initialize motion controller */
    returnValue =
        mpiControlInit(*control);
    msgCHECK(returnValue);

    /* Create axis object */
    *axis =
        mpiAxisCreate(*control,
                      axisNumber);
    msgCHECK(mpiAxisValidate(*axis));

    /* Create motion supervisor object with axis */
    *motion =
        mpiMotionCreate(*control,
                        motionNumber,       /* motion supervisor number */
                        *axis);             /* axis object handle */
    msgCHECK(mpiMotionValidate(*motion));
}


/* Perform certain cleanup actions and delete MPI objects */
void programCleanup(MPIControl      *control,
                    MPIMotion       *motion,
                    MPIAxis         *axis)
{
    long    returnValue;


    /* Delete motion supervisor object */
    returnValue =
        mpiMotionDelete(*motion);
    msgCHECK(returnValue);

    /* Delete axis object */
    returnValue =
        mpiAxisDelete(*axis);
    msgCHECK(returnValue);

    /* Delete motion controller object */
    returnValue =
        mpiControlDelete(*control);
    msgCHECK(returnValue);
}


/* Command simple trapezoidal motion */
long simpleTrapMove(MPIMotion   motion,
                    double      goalPosition,
                    double      velocity,
                    double      acceleration,
                    double      deceleration)
{
    MPIMotionParams     params;     /* Motion parameters      */
    MPITrajectory       trajectory; /* Trajectory information */

    long returnValue;               /* MPI library return value */


    /* Setup trajectory structure */
    trajectory.velocity     = velocity;
    trajectory.acceleration = acceleration;
    trajectory.deceleration = deceleration;

    /* Setup parameters structure */
    params.trapezoidal.trajectory   = &trajectory;
    params.trapezoidal.position     = &goalPosition;

    /* Start motion */
    returnValue =
        mpiMotionStart(motion,
                       MPIMotionTypeTRAPEZOIDAL,
                       &params);
    msgCHECK(returnValue);

    return returnValue;
}


int main(int    argc,
         char   *argv[])
{
    MPIControl          control;    /* motion controller object handle */
    MPIControlType      controlType;
    MPIControlAddress   controlAddress;
    MPIMotion           motion;     /* motion object handle */
    MPIAxis             axis;       /* axis object handle */


    /* Perform basic command line parsing. (-control -server -port -trace) */
    basicParsing(argc,
                 argv,
                 &controlType,
                 &controlAddress);

    /* Create and initialize MPI objects */
    programInit(&control,
                controlType,
                &controlAddress,
                &motion,
                MOTION_NUMBER,
                &axis,
                AXIS_NUMBER);

    /* Command simple motion */
    simpleTrapMove(motion,
                   GOAL_POSITION,
                   VELOCITY,
                   ACCELERATION,
                   DECELERATION);

    /* Perform certain cleanup actions and delete MPI objects */
    programCleanup(&control,
                   &motion,
                   &axis);

    return MPIMessageOK;
}


 
      
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