wolfssl/IDE/MDK5-ARM/Projects/SimpleClient/time-CortexM3-4.c

/* time-STM32F2.c
 *
 * Copyright (C) 2006-2014 wolfSSL Inc.
 *
 * This file is part of CyaSSL.
 *
 * CyaSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * CyaSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifdef HAVE_CONFIG_H
    #include <config.h>
#endif


#include <stdint.h>       
#define DWT                 ((DWT_Type       *)     (0xE0001000UL)     ) 
typedef struct
{
  uint32_t CTRL;                    /*!< Offset: 0x000 (R/W)  Control Register                          */
  uint32_t CYCCNT;                  /*!< Offset: 0x004 (R/W)  Cycle Count Register                      */
} DWT_Type;

extern uint32_t SystemCoreClock ;

double current_time(int reset) 
{
      if(reset) DWT->CYCCNT = 0 ;
      return ((double)DWT->CYCCNT/SystemCoreClock) ;
}