m_engctl.c

dsp6713开发板的许多例程.对入门特别有用

/*********************************************************************
 * FILENAME: $RCSfile: m_engctl.c,v $
 * VERSION : $Revision: 1.2 $
 * DATE    : $Date: 2000/11/03 19:15:43 $
 * Copyright (c) 1997-2000 Texas Instruments Incorporated
 *
 * Engine Simulation Example:
 *____________________________________________________________________
 * - Uses ONE output channel and ONE input channel
 *        
 *
 * - This is the module to be run on the TARGET.
 * - This program is meant to be used with the RTDX display
 *   engineprog.exe
 ********************************************************************/
#include <stdio.h>                      /* fprintf(), puts()        */
#include <stdlib.h>                     /* abort(), rand()          */
#include <time.h>                       /* time()                   */
#include <rtdx.h>                       /* RTDX                     */
#include "target.h"                     /* TARGET_INITIALIZE()      */

/* ===================================================================
 * Typedefs & Global Data structures
 * ================================================================ */
#define TEST_ITERATIONS 100

#define MIN_RPM         0       /* Min/Max Engine RPM's             */
#define MAX_RPM         9000
#define MIN_TC          0       /* Min/Max Turbo Charger RPM        */
#define MAX_TC          25000
#define MIN_MP          -150    /* Min/Max Manifold Pressure        */
#define MAX_MP          +150
#define MIN_WG          10      /* Min/Max Waste Gate %             */
#define MAX_WG          90
#define MIN_TH          10      /* Min/Max Throttle %               */
#define MAX_TH          90


const int timer         = 1;    /* (sec) timer tick value           */

int Get_New_Desired_RPM( void );
int Get_New_Desired_RPM2( int i );
int Get_New_RPM( int MP );
int Get_New_WG( int RPM_Diff, int MP );
int Get_New_TC( int RPM, int WG );
int Get_New_MP( int RPM, int TC );

/*
 * Declare and initialize an output channel called "ochan" and an
 * input channel called "ichan".
 */
RTDX_CreateOutputChannel(ochan);
#ifdef ACCEPTS_DISPLAY_INPUT
RTDX_CreateInputChannel(ichan);
#endif

/* ================================================================ */

void main( void )
{
        int i;                  /* test iterations                  */
        #ifdef ACCEPTS_DISPLAY_INPUT
        int dummy;
        #endif

        struct {
                int DRPM;       /* Desired RPM                      */
                int RPM;        /* Engine's RPMs                    */
                int MP;         /* (.1 psi) Manifold Pressure       */
                int TC;         /* (rpm) Turbo Charger              */
                int WG;         /* % Waste Gate                     */
                } chan_data;

        /* Initialize "chan_data" structure                         */
        chan_data.RPM = 2000;
        chan_data.MP = 0;

        /* Target initialization for RTDX                           */
        TARGET_INITIALIZE();

        /* Enable channels                                          */
        RTDX_enableOutput (&ochan);
        #ifdef ACCEPTS_DISPLAY_INPUT
        RTDX_enableInput (&ichan);
        #endif

	for( i = 0; i<TEST_ITERATIONS; i++ ) {

                #ifdef ACCEPTS_DISPLAY_INPUT
                chan_data.DRPM  = Get_New_Desired_RPM2(i);
                #else
                chan_data.DRPM  = Get_New_Desired_RPM();
                #endif

                chan_data.WG    = Get_New_WG( chan_data.DRPM -
                                              chan_data.RPM,
                                              chan_data.MP );
                chan_data.TC    = Get_New_TC( chan_data.RPM,
                                              chan_data.WG );
                chan_data.MP    = Get_New_MP( chan_data.RPM,
                                              chan_data.TC);
                chan_data.RPM   = Get_New_RPM( chan_data.MP );


                /* Send the data to the host                        */
                if (!RTDX_write( &ochan,
                                 &chan_data,
                                 sizeof(chan_data)) ) {
                        fprintf(stderr,
                                "\nError: RTDX_write() failed!\n");
                        abort();
                }

                /* Wait for data transfer                           */
                while ( RTDX_writing != NULL ) {
                        #if RTDX_POLLING_IMPLEMENTATION
                                /* Call Poll to do data transfer    */
                                RTDX_Poll();
                        #endif
                }

	}

        #ifdef ACCEPTS_DISPLAY_INPUT
        /* One last read to synch with display */
        RTDX_read( &ichan, &dummy, sizeof(dummy) );
        #endif

        /* Disable channels                                         */
        RTDX_disableOutput( &ochan );
        #ifdef ACCEPTS_DISPLAY_INPUT
        RTDX_disableInput( &ichan );
        #endif

        puts("\nProgram Completed!");
}
/* ================================================================ */

int Get_New_Desired_RPM( void )
{
        static int seeded;      /* 1 if random nbr generator seeded */
        static time_t t;

        static long int i       = 80;   /* time keeper              */
        static int Desired_RPM  = 2000;
        int New_RPM             = Desired_RPM;

        /* Generate seed for random nbr generator */
        if ( !seeded ) {
                srand( (unsigned) time(&t) );
                seeded = 1;
        }

        if ( i++ > 100 ) {
                do {
                        /* reset i                                 */
                        i = 0;
                        Desired_RPM = (rand()%8) * 1000 + 1000;
                } while ( New_RPM == Desired_RPM );
        }

        return(Desired_RPM);
}

/* ================================================================ */

int Get_New_Desired_RPM2( int i )
{
        static int Desired_RPM = 2000;  /* the current Desired RPM  */
        int rpm_change = 0;             /* input from user          */

        /*
         * After every 10 Write operations, issue 1 Read operation,
         * to keep in synch with the display.
         */

        /* If 10th iteration...                                     */
        if ( (i != 0) && (i % 10 == 0) ) {
                
                #ifdef ACCEPTS_DISPLAY_INPUT
                /* Get data from display                            */
                if ( (RTDX_read( &ichan,
                                 &rpm_change,
                                 sizeof(rpm_change) ) ) !=
                    sizeof(rpm_change) ) {
                        fprintf(stderr,
                                "\nError: RTDX_read() failed\n");
                        abort();

                }
                #endif

                /* Compute new Desired RPM                          */
                Desired_RPM += rpm_change;

                /* If less than allowed...                          */
                if ( Desired_RPM < MIN_RPM )
                        /* Clip value to minimum                    */
                        Desired_RPM = MIN_RPM;
                /* If more than allowed...                          */
                if ( Desired_RPM > MAX_RPM )
                        /* Clip value to maximum                    */
                        Desired_RPM = MAX_RPM;
        }

        return(Desired_RPM);
}

/* ================================================================ */

int Get_New_RPM( int MP )
{ 
        static int RPM = 2000;
        float m_MP     = 1000.0/150.0;
        int New_RPM;

        New_RPM = m_MP*(float)(MP);

        RPM += New_RPM;

        if ( RPM > MAX_RPM )
                RPM = MAX_RPM;
        if ( RPM < MIN_RPM )
                RPM = MIN_RPM;

        return( RPM );
}

/* ================================================================ */

int Get_New_WG( int Diff_RPM, int MP )
{
        int WG;
        float m_Diff_RPM = 10.0/300.0;

        WG = m_Diff_RPM*(float)Diff_RPM + 50;
        if ( MP > 150 )         /* keep manifold from exploding	    */
                WG = 100;	

        if ( WG > MAX_WG )
                WG = MAX_WG;
        if ( WG < MIN_WG )
                WG = MIN_WG;

        return (WG);
}

/* ================================================================ */

int Get_New_TC( int RPM, int WG )
{
        int TC;
        float m_RPM = 25000.0/9000.0;

        TC = (m_RPM*(float)(RPM)) * ((float)WG/100.0);

        if ( TC > MAX_TC )
                TC = MAX_TC;
        if ( TC < MIN_TC )
                TC = MIN_TC;

        return( TC );
}

/* ================================================================ */

int Get_New_MP( int RPM, int TC )
{
        int MP;         /* (psi) Manifold Pressure                  */
        float m_RPM     = -150.0/4500.0;
        float m_TC      =  66.0/2777.0;

        MP  = m_RPM*(float)RPM;
        MP += m_TC*(float)TC;

        if ( MP > MAX_MP )
                MP = MAX_MP;
        if ( MP < MIN_MP )
                MP = MIN_MP;

        return( MP );
}