time-CortexM3-4.c 1.4 KB

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  1. /* time-STM32F2.c
  2. *
  3. * Copyright (C) 2006-2023 wolfSSL Inc.
  4. *
  5. * This file is part of wolfSSL.
  6. *
  7. * wolfSSL is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License as published by
  9. * the Free Software Foundation; either version 2 of the License, or
  10. * (at your option) any later version.
  11. *
  12. * wolfSSL is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15. * GNU General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU General Public License
  18. * along with this program; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
  20. */
  21. #ifdef HAVE_CONFIG_H
  22. #include <config.h>
  23. #endif
  24. #include <wolfssl/wolfcrypt/settings.h>
  25. #include <stdint.h>
  26. #define DWT ((DWT_Type *) (0xE0001000UL) )
  27. typedef struct
  28. {
  29. uint32_t CTRL; /*!< Offset: 0x000 (R/W) Control Register */
  30. uint32_t CYCCNT; /*!< Offset: 0x004 (R/W) Cycle Count Register */
  31. } DWT_Type;
  32. extern uint32_t SystemCoreClock ;
  33. double current_time(int reset)
  34. {
  35. if(reset) DWT->CYCCNT = 0 ;
  36. return ((double)DWT->CYCCNT/SystemCoreClock) ;
  37. }