/**
* Copyright (c) 2016 - 2017, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef NRF_SYSTICK_H__
#define NRF_SYSTICK_H__
#include "nrf.h"
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
/**
* @defgroup nrf_systick_hal SYSTICK HAL
* @{
* @ingroup nrf_systick
*
* @brief Hardware access layer for accessing the SYSTICK peripheral.
*
* SYSTICK is ARM peripheral, not Nordic design.
* It means that it has no Nordic-typical interface with Tasks and Events.
*
* Its usage is limited here to implement simple delays.
* Also keep in mind that this timer would be stopped when CPU is sleeping
* (WFE/WFI instruction is successfully executed).
*/
/**
* @brief Mask of usable bits in the SysTick value
*/
#define NRF_SYSTICK_VAL_MASK SysTick_VAL_CURRENT_Msk
/**
* @brief Flags used by SysTick configuration.
*
* @sa nrf_systick_csr_set
* @sa nrf_systick_csr_get
*/
typedef enum {
NRF_SYSTICK_CSR_COUNTFLAG_MASK = SysTick_CTRL_COUNTFLAG_Msk, /**< Status flag: Returns 1 if timer counted to 0 since the last read of this register. */
NRF_SYSTICK_CSR_CLKSOURCE_MASK = SysTick_CTRL_CLKSOURCE_Msk, /**< Configuration bit: Select the SysTick clock source. */
NRF_SYSTICK_CSR_CLKSOURCE_REF = 0U << SysTick_CTRL_CLKSOURCE_Pos, /**< Configuration value: Select reference clock. */
NRF_SYSTICK_CSR_CLKSOURCE_CPU = 1U << SysTick_CTRL_CLKSOURCE_Pos, /**< Configuration value: Select CPU clock. */
NRF_SYSTICK_CSR_TICKINT_MASK = SysTick_CTRL_TICKINT_Msk, /**< Configuration bit: Enables SysTick exception request. */
NRF_SYSTICK_CSR_TICKINT_ENABLE = 1U << SysTick_CTRL_TICKINT_Pos, /**< Configuration value: Counting down to zero does not assert the SysTick exception request. */
NRF_SYSTICK_CSR_TICKINT_DISABLE = 0U << SysTick_CTRL_TICKINT_Pos, /**< Configuration value: Counting down to zero to asserts the SysTick exception request. */
NRF_SYSTICK_CSR_ENABLE_MASK = SysTick_CTRL_ENABLE_Msk, /**< Configuration bit: Enable the SysTick timer. */
NRF_SYSTICK_CSR_ENABLE = 1U << SysTick_CTRL_ENABLE_Pos, /**< Configuration value: Counter enabled. */
NRF_SYSTICK_CSR_DISABLE = 0U << SysTick_CTRL_ENABLE_Pos /**< Configuration value: Counter disabled. */
} nrf_systick_csr_flags_t;
/**
* @brief Get Configuration and Status Register
*
* @return Values composed by @ref nrf_systick_csr_flags_t.
* @note The @ref NRF_SYSTICK_CSR_COUNTFLAG_MASK value is cleared when CSR register is read.
*/
__STATIC_INLINE uint32_t nrf_systick_csr_get(void);
/**
* @brief Set Configuration and Status Register
*
* @param[in] val The value composed from @ref nrf_systick_csr_flags_t.
*/
__STATIC_INLINE void nrf_systick_csr_set(uint32_t val);
/**
* @brief Get the current reload value.
*
* @return The reload register value.
*/
__STATIC_INLINE uint32_t nrf_systick_load_get(void);
/**
* @brief Configure the reload value.
*
* @param[in] val The value to set in the reload register.
*/
__STATIC_INLINE void nrf_systick_load_set(uint32_t val);
/**
* @brief Read the SysTick current value
*
* @return The current SysTick value
* @sa NRF_SYSTICK_VAL_MASK
*/
__STATIC_INLINE uint32_t nrf_systick_val_get(void);
/**
* @brief Clear the SysTick current value
*
* @note The SysTick does not allow setting current value.
* Any write to VAL register would clear the timer.
*/
__STATIC_INLINE void nrf_systick_val_clear(void);
/**
* @brief Read the calibration register
*
* @return The calibration register value
*/
__STATIC_INLINE uint32_t nrf_systick_calib_get(void);
#ifndef SUPPRESS_INLINE_IMPLEMENTATION
__STATIC_INLINE uint32_t nrf_systick_csr_get(void)
{
return SysTick->CTRL;
}
__STATIC_INLINE void nrf_systick_csr_set(uint32_t val)
{
SysTick->CTRL = val;
}
__STATIC_INLINE uint32_t nrf_systick_load_get(void)
{
return SysTick->LOAD;
}
__STATIC_INLINE void nrf_systick_load_set(uint32_t val)
{
SysTick->LOAD = val;
}
__STATIC_INLINE uint32_t nrf_systick_val_get(void)
{
return SysTick->VAL;
}
__STATIC_INLINE void nrf_systick_val_clear(void)
{
SysTick->VAL = 0;
}
__STATIC_INLINE uint32_t nrf_systick_calib_get(void)
{
return SysTick->CALIB;
}
#endif /* SUPPRESS_INLINE_IMPLEMENTATION */
/** @} */
#endif /* NRF_SYSTICK_H__ */