tpu_fqm_ex1.c

mpc564 时钟中断 时钟中断

/**************************************************************************/
/* FILE NAME: tpu_tsm_ex1.c                   COPYRIGHT (c) MOTOROLA 2002 */
/* VERSION: 1.0                                   All Rights Reserved     */
/*                                                                        */
/* DESCRIPTION: This sample program shows a simple example of a program   */
/* that initializes the FQM function                                      */
/* The example uses the TPU A channel 0                                   */
/* The program is targeted for the MPC555 but should work on any MPC500   */
/* device with a TPU. For other devices the setup routines will also need */
/* to be changed.                                                         */
/*========================================================================*/
/* HISTORY           ORIGINAL AUTHOR: Jeff Loeliger                       */
/* REV      AUTHOR      DATE       DESCRIPTION OF CHANGE                  */
/* ---   -----------  ---------    ---------------------                  */
/* 1.0   J. Loeliger  03/Aug/02    Initial version of function.           */
/* 1.1   R, Dees      08/Sep/02    Convert to FQM example.                */
/**************************************************************************/

#include "mpc555.h"     /* Define all of the MPC555 registers, this needs to */
                        /* changed if other MPC500 devices are used.         */
#include "mpc500.c"     /* Configuration routines for MPC555 EVB, will need */
                        /* to be changed if other hardware is used.         */
#include "mpc500_util.h"    /* Utility routines for using MPC500 devices    */
#include "tpu_fqm.h"    /* TPU FQM functions */

/* Initialization parameters  */

     struct TPU3_tag *tpua = &TPU_A;   /* pointer for TPU routines */

void main ()
{
     int x;  /* Just an integer to hold a value  */
     UINT8 chan=0; /* set to  channel 0 */
     UINT16 freq;


/* Hardware Setup -- machine settings (watchdog, timers, speed, etc.) */
   setup_mpc500(40);       /*Setup device and programm PLL to 40MHz*/	
   setup_tpu(tpua); /* Do general TPU set up. */

   tpu_fqm_init(tpua, chan, TPU_PRIORITY_HIGH, TPU_FQM_FALL_EDGE_CONT, 
                 TPU_FQM_FALL, TPU_FQM_TCR1,0x8000);

   tpu_ready(tpua, chan);
   freq = tpu_fqm_get_pulse(tpua, chan);
   
   while(1){
      /* Hold at end of program */
      x=4;
      
     };
}    /* End of main */


void setup_tpu(struct TPU3_tag *tpu)
{
     tpu->TPUMCR.R = 0x2020; /* TCR1 prescaler divide by 2, supervisor and user acces. */
     tpu->TPUMCR3.R = 0x0040; /* enable enhanced prescaler - divide by 2 */
     tpu->TICR.B.CIRL = 5; /* set interupt level to 5.... */
     tpu->TICR.B.ILBS = 0;
}

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