/** * Copyright (c) 2016 - 2018, 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 #ifdef __cplusplus extern "C" { #endif /** * @defgroup nrf_systick_hal SYSTICK HAL * @{ * @ingroup nrf_systick * @brief Hardware access layer for managing 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 */ /** @} */ #ifdef __cplusplus } #endif #endif /* NRF_SYSTICK_H__ */