timer.h

IIR数字滤波器设计。其中涉及到Matlab软件中IIR的参数设计及CCS中的软件仿真及硬件仿真程序

/******************************************************************/
/* timer.h - v0.00                                                */
/* Copyright (c) 2000 Texas Instruments Incorporated              */
/******************************************************************/
/******************************************************************/
/* Define Timer Period, and Control Registers with all related    */
/* data structures, macros, and functions                         */
/******************************************************************/
#include "regs54xx.h"


/******************************************************************/
/* TIMER_START - starts timer operation                           */
/******************************************************************/
#define TIMER_START(port)\
        TCR(port) &= ~MASK_BIT(TSS)

/******************************************************************/
/* TIMER_HALT - halts timer operation                             */
/******************************************************************/
#define TIMER_HALT(port)\
        TCR(port) |= MASK_BIT(TSS)

/******************************************************************/
/* TCR_MASK - creates mask to set relevant fields in Timer Cntrl  */
/*           register                                             */
/*   trb    - val to set timer reload bit                         */
/*   tss    - val to set timer stop/start bit                     */
/*   tddr   - val to set timer divide-down ratio                  */
/******************************************************************/
#define TCR_MASK(trb, tss, tddr)\
         ((trb ? MASK_BIT(TRB) | MASK_TARGET_WORD: ~MASK_BIT(TRB))&\
          (tss ? MASK_BIT(TSS) | MASK_TARGET_WORD: ~MASK_BIT(TSS))&\
          (tddr ? (MASK_FIELD(TDDR,tddr, TDDR_SZ) | MASK_TARGET_WORD) :\
                 ~MASK_FIELD(TDDR,tddr, TDDR_SZ))) 


/******************************************************************/
/* TIMER_INIT (ctrl, prd) - init and start timer                  */
/*  ctrl - mask used to set timer control register                */
/*  prd  - value to set timer period register                     */
/******************************************************************/
#define TIMER_INIT(port, ctrl, prd)\
       { SET_BIT(TCR_ADDR(port),TSS);\
         TCR(port) = ctrl;\
         PRD(port) = prd;\
         TIMER_RELOAD(port); }

/******************************************************************/
/* timer_reset - reset timer to conditions defined by device reset*/
/*  i.e.  period = 0xffff    , tddr = 0x000                       */
/******************************************************************/
#define TIMER_RESET(port)\
	{ TIMER_HALT(port);\
          LOAD_FIELD(TCR_ADDR(port), 0x000, TDDR, TDDR_SZ);\
          PRD(port) = 0xffff;\
          TIMER_START(port); }

/******************************************************************/
/* TIMER_RELOAD() - reloads timer with previsouly set             */
/*                  period value, etc..                           */
/******************************************************************/
#define TIMER_RELOAD(port)\
	{ TIMER_HALT(port);\
	  TCR(port) |= MASK_BIT(TRB);\
          TIMER_START(port); }

/******************************************************************/
/* TIMER_READ - reads current value of timer                      */
/******************************************************************/
#define TIMER_READ(port)\
	TIM(port)

/******************************************************************/
/* MASK_CLKMD(PLLMUL, PLLDIV, PLLCOUNT, PLLONOFF, PLLNDIV)        */
/*           creates mas kto set PLL clock mode register          */
/*                                                                */
/* PLLMUL - defines frequency multiplier                          */
/* PLLDIV - PLL divider is used with PLLMUL & PLLNDIV to          */
/*          define multiplier frequency                           */
/*                                                                */
/* PLLCOUNT - # of cycles for PLL to count before processor       */
/*            is clocked                                          */
/*                                                                */
/* PLLONOFF - enables/disables the analog part of the PLL         */
/* PLLNDIV  - in conjunction with PLLMIL & PLLDIV determines      */
/*            value of multiplier.                                */
/******************************************************************/
#define MASK_CLKMD(pllmul, plldiv, pllcount, pllonoff, pllndiv)\
      ((pllmul ? (MASK_FIELD(PLLMUL, pllmul, PLLMUL_SZ) | MASK_TARGET_WORD):\
        ~MASK_FIELD(PLLMUL, 0xf, PLLMUL_SZ))     &\
       (plldiv ? (MASK_BIT(PLLDIV) | MASK_TARGET_WORD) :\
        ~MASK_BIT(PLLDIV))            &\
       (pllcount ? (MASK_FIELD(PLLCOUNT,pllcount, PLLCOUNT_SZ) | MASK_TARGET_WORD):\
        ~MASK_FIELD(PLLCOUNT,0x7f, PLLCOUNT_SZ)) &\
       (pllonoff ? (MASK_BIT(PLLONOFF) | MASK_TARGET_WORD): \
        ~MASK_BIT(PLLONOFF))        &\
       (pllndiv ? MASK_BIT(PLLNDIV) | MASK_TARGET_WORD :\
        ~MASK_BIT(PLLNDIV)))


/******************************************************************/
/* CLOCK_RESET(ctrl) - resets clock mode register                 */
/*    ctrl - mask to set control register                         */
/******************************************************************/
#define CLOCK_RESET(ctrl)\
	CLKMD = ctrl