system_nrf52.h 2.3 KB

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  1. /* Copyright (c) 2015, Nordic Semiconductor ASA
  2. * All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions are met:
  6. *
  7. * * Redistributions of source code must retain the above copyright notice, this
  8. * list of conditions and the following disclaimer.
  9. *
  10. * * Redistributions in binary form must reproduce the above copyright notice,
  11. * this list of conditions and the following disclaimer in the documentation
  12. * and/or other materials provided with the distribution.
  13. *
  14. * * Neither the name of Nordic Semiconductor ASA nor the names of its
  15. * contributors may be used to endorse or promote products derived from
  16. * this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19. * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21. * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24. * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25. * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28. *
  29. */
  30. #ifndef SYSTEM_NRF52_H
  31. #define SYSTEM_NRF52_H
  32. #ifdef __cplusplus
  33. extern "C" {
  34. #endif
  35. #include <stdint.h>
  36. extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock) */
  37. /**
  38. * Initialize the system
  39. *
  40. * @param none
  41. * @return none
  42. *
  43. * @brief Setup the microcontroller system.
  44. * Initialize the System and update the SystemCoreClock variable.
  45. */
  46. extern void SystemInit (void);
  47. /**
  48. * Update SystemCoreClock variable
  49. *
  50. * @param none
  51. * @return none
  52. *
  53. * @brief Updates the SystemCoreClock with current core Clock
  54. * retrieved from cpu registers.
  55. */
  56. extern void SystemCoreClockUpdate (void);
  57. #ifdef __cplusplus
  58. }
  59. #endif
  60. #endif /* SYSTEM_NRF52_H */