hal_timer.c

最新版IAR FOR ARM（EWARM）5.11中的代码例子

/************************************************************************/
/*                                                                      */
/*    Copyright (C) 2006 Oki Electric Industry Co., LTD.                */
/*                                                                      */
/*    System Name    :  uPLAT7D series                                  */
/*    Module Name    :  uPLAT7D system timer HAL program                */
/*    File   Name    :  hal_timer.c                                     */
/*    Date           :  2005/12/14 initial version                      */
/*                                                                      */
/************************************************************************/

#include "common.h"
#if defined(__arm)
#include "ml675050.h"
#else
#include "ml675050sim.h"
#endif
#include "hal_common.h"
#include "hal_interrupt.h"
#include "hal_timer.h"


#define TIMER_CGBGR  8   /* clock gear */

/******************************/
/*     Private defines        */
/******************************/
/*--------- variable ---------*/

/*--------- function ---------*/
static void _timer_handler(void);        /* The handler of system timer. */

/******************************/
/*     Public defines         */
/******************************/
FP timer_handler = _timer_handler;


/************************************************************************/
/*                                                                      */
/*  Function Name   : HALTimer_Init                                     */
/*  Input           : cycle Timer cycle.                                */
/*  Output          : int16_t HAL_OK(1)                                 */
/*                            HAL_PARAM_ERROR(-2)                       */
/*                                                                      */
/*  Note : Initialize system timer.                                     */
/*                                                                      */
/************************************************************************/
int16_t HALTimer_Init(uint16_t cycle)
{
    int16_t rtnVal = HAL_OK;
    uint32_t reloadVal;
    uint32_t temp;
    
    OkiCLib_write32(TMEN, TMEN_TCEN >> 1);    /* System timer stop. */
    OkiCLib_write32(TMOVF, TMOVF_OVF);        /* Clear overflow. */
    
    temp = (uint32_t)(cycle * (SYSCLK / TIMER_CGBGR) * 1000 / 16);
    if (65536 <= temp) {
        return HAL_PARAM_ERROR;
    }
    reloadVal = 65536 - temp;

    OkiCLib_write32(TMRLR, reloadVal);    /* Set timer reload value. */

    return rtnVal;
}

/************************************************************************/
/*                                                                      */
/*  Function Name   : HALTimer_SetStart                                 */
/*  Input           : start 1: start  0: stop                           */
/*  Output          : void                                              */
/*                                                                      */
/*  Note : Start or stop system timer.                                  */
/*                                                                      */
/************************************************************************/
void HALTimer_SetStart(uint16_t start) {
    if (start == 1) {
        OkiCLib_write32(TMEN, TMEN_TCEN);      /* System timer start. */
    }
    else {
        OkiCLib_write32(TMEN, TMEN_TCEN >> 1); /* System timer stop. */
    }
}

/************************************************************************/
/*                                                                      */
/*  Function Name   : _timer_handler                                    */
/*  Input           : void                                              */
/*  Output          : void                                              */
/*                                                                      */
/*  Note : System timer handler.                                        */
/*                                                                      */
/************************************************************************/
static void _timer_handler(void)
{
    OkiCLib_write32(TMOVF, TMOVF_OVF);
    CALL_BACK_TABLE[INT_SYSTIMER](CALLBACK_STATE_NON);
}