rtc, keeping time

1 files changed, 630 insertions, 0 deletions

diff --git a/drivers_nrf/hal/nrf_timer.h b/drivers_nrf/hal/nrf_timer.h
new file mode 100644
index 0000000..d089d01
--- /dev/null
+++ b/drivers_nrf/hal/nrf_timer.h
@@ -0,0 +1,630 @@
+/**
+ * Copyright (c) 2014 - 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.
+ * 
+ */
+/**
+ * @defgroup nrf_timer_hal Timer HAL
+ * @{
+ * @ingroup nrf_timer
+ *
+ * @brief Hardware access layer for accessing the timer peripheral.
+ */
+
+#ifndef NRF_TIMER_H__
+#define NRF_TIMER_H__
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "nrf_peripherals.h"
+#include "nrf.h"
+#include "nrf_assert.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @brief Macro for validating the correctness of the BIT_WIDTH setting.
+ */
+
+#define TIMER_MAX_SIZE(id) CONCAT_3(TIMER, id, _MAX_SIZE)
+
+#define TIMER_BIT_WIDTH_MAX(id, bit_width) \
+    (TIMER_MAX_SIZE(id) == 8   ? (bit_width == NRF_TIMER_BIT_WIDTH_8)  :  \
+    (TIMER_MAX_SIZE(id) == 16  ? (bit_width == NRF_TIMER_BIT_WIDTH_8)  || \
+                                 (bit_width == NRF_TIMER_BIT_WIDTH_16)  : \
+    (TIMER_MAX_SIZE(id) == 24  ? (bit_width == NRF_TIMER_BIT_WIDTH_8)  || \
+                                 (bit_width == NRF_TIMER_BIT_WIDTH_16) || \
+                                 (bit_width == NRF_TIMER_BIT_WIDTH_24) :  \
+    (TIMER_MAX_SIZE(id) == 32  ? (bit_width == NRF_TIMER_BIT_WIDTH_8)  || \
+                                 (bit_width == NRF_TIMER_BIT_WIDTH_16) || \
+                                 (bit_width == NRF_TIMER_BIT_WIDTH_24) || \
+                                 (bit_width == NRF_TIMER_BIT_WIDTH_32) :  \
+    false))))
+
+#if TIMER_COUNT > 3
+#define NRF_TIMER_IS_BIT_WIDTH_VALID(p_reg, bit_width) (                \
+       ((p_reg == NRF_TIMER0) && (TIMER_BIT_WIDTH_MAX(0, bit_width)))   \
+    || ((p_reg == NRF_TIMER1) && (TIMER_BIT_WIDTH_MAX(1, bit_width)))   \
+    || ((p_reg == NRF_TIMER2) && (TIMER_BIT_WIDTH_MAX(2, bit_width)))   \
+    || ((p_reg == NRF_TIMER3) && (TIMER_BIT_WIDTH_MAX(3, bit_width)))   \
+    || ((p_reg == NRF_TIMER4) && (TIMER_BIT_WIDTH_MAX(4, bit_width))) )
+
+#else
+#define NRF_TIMER_IS_BIT_WIDTH_VALID(p_reg, bit_width) (             \
+       ((p_reg == NRF_TIMER0) && TIMER_BIT_WIDTH_MAX(0, bit_width))  \
+    || ((p_reg == NRF_TIMER1) && TIMER_BIT_WIDTH_MAX(1, bit_width))  \
+    || ((p_reg == NRF_TIMER2) && TIMER_BIT_WIDTH_MAX(2, bit_width)) )
+
+#endif
+
+/**
+ * @brief Macro for getting the number of capture/compare channels available
+ *        in a given timer instance.
+ */
+#define NRF_TIMER_CC_CHANNEL_COUNT(id)  CONCAT_3(TIMER, id, _CC_NUM)
+
+/**
+ * @brief Timer tasks.
+ */
+typedef enum
+{
+    /*lint -save -e30 -esym(628,__INTADDR__)*/
+    NRF_TIMER_TASK_START    = offsetof(NRF_TIMER_Type, TASKS_START),      ///< Task for starting the timer.
+    NRF_TIMER_TASK_STOP     = offsetof(NRF_TIMER_Type, TASKS_STOP),       ///< Task for stopping the timer.
+    NRF_TIMER_TASK_COUNT    = offsetof(NRF_TIMER_Type, TASKS_COUNT),      ///< Task for incrementing the timer (in counter mode).
+    NRF_TIMER_TASK_CLEAR    = offsetof(NRF_TIMER_Type, TASKS_CLEAR),      ///< Task for resetting the timer value.
+    NRF_TIMER_TASK_SHUTDOWN = offsetof(NRF_TIMER_Type, TASKS_SHUTDOWN),   ///< Task for powering off the timer.
+    NRF_TIMER_TASK_CAPTURE0 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[0]), ///< Task for capturing the timer value on channel 0.
+    NRF_TIMER_TASK_CAPTURE1 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[1]), ///< Task for capturing the timer value on channel 1.
+    NRF_TIMER_TASK_CAPTURE2 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[2]), ///< Task for capturing the timer value on channel 2.
+    NRF_TIMER_TASK_CAPTURE3 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[3]), ///< Task for capturing the timer value on channel 3.
+#if (TIMER_COUNT > 3) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_TASK_CAPTURE4 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[4]), ///< Task for capturing the timer value on channel 4.
+    NRF_TIMER_TASK_CAPTURE5 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[5]), ///< Task for capturing the timer value on channel 5.
+#endif
+    /*lint -restore*/
+} nrf_timer_task_t;
+
+/**
+ * @brief Timer events.
+ */
+typedef enum
+{
+    /*lint -save -e30*/
+    NRF_TIMER_EVENT_COMPARE0 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[0]), ///< Event from compare channel 0.
+    NRF_TIMER_EVENT_COMPARE1 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[1]), ///< Event from compare channel 1.
+    NRF_TIMER_EVENT_COMPARE2 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[2]), ///< Event from compare channel 2.
+    NRF_TIMER_EVENT_COMPARE3 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[3]), ///< Event from compare channel 3.
+#if (TIMER_COUNT > 3) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_EVENT_COMPARE4 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[4]), ///< Event from compare channel 4.
+    NRF_TIMER_EVENT_COMPARE5 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[5]), ///< Event from compare channel 5.
+#endif
+    /*lint -restore*/
+} nrf_timer_event_t;
+
+/**
+ * @brief Types of timer shortcuts.
+ */
+typedef enum
+{
+    NRF_TIMER_SHORT_COMPARE0_STOP_MASK = TIMER_SHORTS_COMPARE0_STOP_Msk,   ///< Shortcut for stopping the timer based on compare 0.
+    NRF_TIMER_SHORT_COMPARE1_STOP_MASK = TIMER_SHORTS_COMPARE1_STOP_Msk,   ///< Shortcut for stopping the timer based on compare 1.
+    NRF_TIMER_SHORT_COMPARE2_STOP_MASK = TIMER_SHORTS_COMPARE2_STOP_Msk,   ///< Shortcut for stopping the timer based on compare 2.
+    NRF_TIMER_SHORT_COMPARE3_STOP_MASK = TIMER_SHORTS_COMPARE3_STOP_Msk,   ///< Shortcut for stopping the timer based on compare 3.
+#if (TIMER_COUNT > 3) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_SHORT_COMPARE4_STOP_MASK = TIMER_SHORTS_COMPARE4_STOP_Msk,   ///< Shortcut for stopping the timer based on compare 4.
+    NRF_TIMER_SHORT_COMPARE5_STOP_MASK = TIMER_SHORTS_COMPARE5_STOP_Msk,   ///< Shortcut for stopping the timer based on compare 5.
+#endif
+    NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK = TIMER_SHORTS_COMPARE0_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 0.
+    NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK = TIMER_SHORTS_COMPARE1_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 1.
+    NRF_TIMER_SHORT_COMPARE2_CLEAR_MASK = TIMER_SHORTS_COMPARE2_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 2.
+    NRF_TIMER_SHORT_COMPARE3_CLEAR_MASK = TIMER_SHORTS_COMPARE3_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 3.
+#if (TIMER_COUNT > 3) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_SHORT_COMPARE4_CLEAR_MASK = TIMER_SHORTS_COMPARE4_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 4.
+    NRF_TIMER_SHORT_COMPARE5_CLEAR_MASK = TIMER_SHORTS_COMPARE5_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 5.
+#endif
+} nrf_timer_short_mask_t;
+
+/**
+ * @brief Timer modes.
+ */
+typedef enum
+{
+    NRF_TIMER_MODE_TIMER             = TIMER_MODE_MODE_Timer,           ///< Timer mode: timer.
+    NRF_TIMER_MODE_COUNTER           = TIMER_MODE_MODE_Counter,         ///< Timer mode: counter.
+#if defined(TIMER_MODE_MODE_LowPowerCounter) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_MODE_LOW_POWER_COUNTER = TIMER_MODE_MODE_LowPowerCounter, ///< Timer mode: low-power counter.
+#endif
+} nrf_timer_mode_t;
+
+/**
+ * @brief Timer bit width.
+ */
+typedef enum
+{
+    NRF_TIMER_BIT_WIDTH_8  = TIMER_BITMODE_BITMODE_08Bit, ///< Timer bit width 8 bit.
+    NRF_TIMER_BIT_WIDTH_16 = TIMER_BITMODE_BITMODE_16Bit, ///< Timer bit width 16 bit.
+    NRF_TIMER_BIT_WIDTH_24 = TIMER_BITMODE_BITMODE_24Bit, ///< Timer bit width 24 bit.
+    NRF_TIMER_BIT_WIDTH_32 = TIMER_BITMODE_BITMODE_32Bit  ///< Timer bit width 32 bit.
+} nrf_timer_bit_width_t;
+
+/**
+ * @brief Timer prescalers.
+ */
+typedef enum
+{
+    NRF_TIMER_FREQ_16MHz = 0, ///< Timer frequency 16 MHz.
+    NRF_TIMER_FREQ_8MHz,      ///< Timer frequency 8 MHz.
+    NRF_TIMER_FREQ_4MHz,      ///< Timer frequency 4 MHz.
+    NRF_TIMER_FREQ_2MHz,      ///< Timer frequency 2 MHz.
+    NRF_TIMER_FREQ_1MHz,      ///< Timer frequency 1 MHz.
+    NRF_TIMER_FREQ_500kHz,    ///< Timer frequency 500 kHz.
+    NRF_TIMER_FREQ_250kHz,    ///< Timer frequency 250 kHz.
+    NRF_TIMER_FREQ_125kHz,    ///< Timer frequency 125 kHz.
+    NRF_TIMER_FREQ_62500Hz,   ///< Timer frequency 62500 Hz.
+    NRF_TIMER_FREQ_31250Hz    ///< Timer frequency 31250 Hz.
+} nrf_timer_frequency_t;
+
+/**
+ * @brief Timer capture/compare channels.
+ */
+typedef enum
+{
+    NRF_TIMER_CC_CHANNEL0 = 0, ///< Timer capture/compare channel 0.
+    NRF_TIMER_CC_CHANNEL1,     ///< Timer capture/compare channel 1.
+    NRF_TIMER_CC_CHANNEL2,     ///< Timer capture/compare channel 2.
+    NRF_TIMER_CC_CHANNEL3,     ///< Timer capture/compare channel 3.
+#if (TIMER_COUNT > 3) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_CC_CHANNEL4,     ///< Timer capture/compare channel 4.
+    NRF_TIMER_CC_CHANNEL5,     ///< Timer capture/compare channel 5.
+#endif
+} nrf_timer_cc_channel_t;
+
+/**
+ * @brief Timer interrupts.
+ */
+typedef enum
+{
+    NRF_TIMER_INT_COMPARE0_MASK = TIMER_INTENSET_COMPARE0_Msk, ///< Timer interrupt from compare event on channel 0.
+    NRF_TIMER_INT_COMPARE1_MASK = TIMER_INTENSET_COMPARE1_Msk, ///< Timer interrupt from compare event on channel 1.
+    NRF_TIMER_INT_COMPARE2_MASK = TIMER_INTENSET_COMPARE2_Msk, ///< Timer interrupt from compare event on channel 2.
+    NRF_TIMER_INT_COMPARE3_MASK = TIMER_INTENSET_COMPARE3_Msk, ///< Timer interrupt from compare event on channel 3.
+#if (TIMER_COUNT > 3) || defined(__SDK_DOXYGEN__)
+    NRF_TIMER_INT_COMPARE4_MASK = TIMER_INTENSET_COMPARE4_Msk, ///< Timer interrupt from compare event on channel 4.
+    NRF_TIMER_INT_COMPARE5_MASK = TIMER_INTENSET_COMPARE5_Msk, ///< Timer interrupt from compare event on channel 5.
+#endif
+} nrf_timer_int_mask_t;
+
+
+/**
+ * @brief Function for activating a specific timer task.
+ *
+ * @param[in] p_reg   Pointer to the peripheral registers structure.
+ * @param[in] task    Task to activate.
+ */
+__STATIC_INLINE void nrf_timer_task_trigger(NRF_TIMER_Type * p_reg,
+                                            nrf_timer_task_t task);
+
+/**
+ * @brief Function for getting the address of a specific timer task register.
+ *
+ * @param[in] p_reg   Pointer to the peripheral registers structure.
+ * @param[in] task    Requested task.
+ *
+ * @return Address of the specified task register.
+ */
+__STATIC_INLINE uint32_t * nrf_timer_task_address_get(NRF_TIMER_Type * p_reg,
+                                                      nrf_timer_task_t task);
+
+/**
+ * @brief Function for clearing a specific timer event.
+ *
+ * @param[in] p_reg   Pointer to the peripheral registers structure.
+ * @param[in] event   Event to clear.
+ */
+__STATIC_INLINE void nrf_timer_event_clear(NRF_TIMER_Type * p_reg,
+                                           nrf_timer_event_t event);
+
+/**
+ * @brief Function for checking the state of a specific timer event.
+ *
+ * @param[in] p_reg   Pointer to the peripheral registers structure.
+ * @param[in] event   Event to check.
+ *
+ * @retval true  If the event is set.
+ * @retval false If the event is not set.
+ */
+__STATIC_INLINE bool nrf_timer_event_check(NRF_TIMER_Type * p_reg,
+                                           nrf_timer_event_t event);
+
+/**
+ * @brief Function for getting the address of a specific timer event register.
+ *
+ * @param[in] p_reg   Pointer to the peripheral registers structure.
+ * @param[in] event   Requested event.
+ *
+ * @return Address of the specified event register.
+ */
+__STATIC_INLINE uint32_t * nrf_timer_event_address_get(NRF_TIMER_Type * p_reg,
+                                                       nrf_timer_event_t event);
+
+/**
+ * @brief Function for enabling specified shortcuts.
+ *
+ * @param[in] p_reg             Pointer to the peripheral registers structure.
+ * @param[in] timer_shorts_mask Shortcuts to enable.
+ */
+__STATIC_INLINE void nrf_timer_shorts_enable(NRF_TIMER_Type * p_reg,
+                                             uint32_t timer_shorts_mask);
+
+/**
+ * @brief Function for disabling specified shortcuts.
+ *
+ * @param[in] p_reg             Pointer to the peripheral registers structure.
+ * @param[in] timer_shorts_mask Shortcuts to disable.
+ */
+__STATIC_INLINE void nrf_timer_shorts_disable(NRF_TIMER_Type * p_reg,
+                                              uint32_t timer_shorts_mask);
+
+/**
+ * @brief Function for enabling specified interrupts.
+ *
+ * @param[in] p_reg          Pointer to the peripheral registers structure.
+ * @param[in] timer_int_mask Interrupts to enable.
+ */
+__STATIC_INLINE void nrf_timer_int_enable(NRF_TIMER_Type * p_reg,
+                                          uint32_t timer_int_mask);
+
+/**
+ * @brief Function for disabling specified interrupts.
+ *
+ * @param[in] p_reg          Pointer to the peripheral registers structure.
+ * @param[in] timer_int_mask Interrupts to disable.
+ */
+__STATIC_INLINE void nrf_timer_int_disable(NRF_TIMER_Type * p_reg,
+                                           uint32_t timer_int_mask);
+
+/**
+ * @brief Function for retrieving the state of a given interrupt.
+ *
+ * @param[in] p_reg     Pointer to the peripheral registers structure.
+ * @param[in] timer_int Interrupt to check.
+ *
+ * @retval true  If the interrupt is enabled.
+ * @retval false If the interrupt is not enabled.
+ */
+__STATIC_INLINE bool nrf_timer_int_enable_check(NRF_TIMER_Type * p_reg,
+                                                uint32_t timer_int);
+
+/**
+ * @brief Function for setting the timer mode.
+ *
+ * @param[in] p_reg   Pointer to the peripheral registers structure.
+ * @param[in] mode    Timer mode.
+ */
+__STATIC_INLINE void nrf_timer_mode_set(NRF_TIMER_Type * p_reg,
+                                        nrf_timer_mode_t mode);
+
+/**
+ * @brief Function for retrieving the timer mode.
+ *
+ * @param[in] p_reg Pointer to the peripheral registers structure.
+ *
+ * @return Timer mode.
+ */
+__STATIC_INLINE nrf_timer_mode_t nrf_timer_mode_get(NRF_TIMER_Type * p_reg);
+
+/**
+ * @brief Function for setting the timer bit width.
+ *
+ * @param[in] p_reg     Pointer to the peripheral registers structure.
+ * @param[in] bit_width Timer bit width.
+ */
+__STATIC_INLINE void nrf_timer_bit_width_set(NRF_TIMER_Type * p_reg,
+                                             nrf_timer_bit_width_t bit_width);
+
+/**
+ * @brief Function for retrieving the timer bit width.
+ *
+ * @param[in] p_reg Pointer to the peripheral registers structure.
+ *
+ * @return Timer bit width.
+ */
+__STATIC_INLINE nrf_timer_bit_width_t nrf_timer_bit_width_get(NRF_TIMER_Type * p_reg);
+
+/**
+ * @brief Function for setting the timer frequency.
+ *
+ * @param[in] p_reg     Pointer to the peripheral registers structure.
+ * @param[in] frequency Timer frequency.
+ */
+__STATIC_INLINE void nrf_timer_frequency_set(NRF_TIMER_Type * p_reg,
+                                             nrf_timer_frequency_t frequency);
+
+/**
+ * @brief Function for retrieving the timer frequency.
+ *
+ * @param[in] p_reg Pointer to the peripheral registers structure.
+ *
+ * @return Timer frequency.
+ */
+__STATIC_INLINE nrf_timer_frequency_t nrf_timer_frequency_get(NRF_TIMER_Type * p_reg);
+
+/**
+ * @brief Function for writing the capture/compare register for a specified channel.
+ *
+ * @param[in] p_reg      Pointer to the peripheral registers structure.
+ * @param[in] cc_channel Requested capture/compare channel.
+ * @param[in] cc_value   Value to write to the capture/compare register.
+ */
+__STATIC_INLINE void nrf_timer_cc_write(NRF_TIMER_Type * p_reg,
+                                        nrf_timer_cc_channel_t cc_channel,
+                                        uint32_t               cc_value);
+
+/**
+ * @brief Function for retrieving the capture/compare value for a specified channel.
+ *
+ * @param[in] p_reg      Pointer to the peripheral registers structure.
+ * @param[in] cc_channel Requested capture/compare channel.
+ *
+ * @return Value from the requested capture/compare register.
+ */
+__STATIC_INLINE uint32_t nrf_timer_cc_read(NRF_TIMER_Type * p_reg,
+                                           nrf_timer_cc_channel_t cc_channel);
+
+/**
+ * @brief Function for getting a specific timer capture task.
+ *
+ * @param[in] channel Capture channel.
+ *
+ * @return Capture task.
+ */
+__STATIC_INLINE nrf_timer_task_t nrf_timer_capture_task_get(uint32_t channel);
+
+/**
+ * @brief Function for getting a specific timer compare event.
+ *
+ * @param[in] channel Compare channel.
+ *
+ * @return Compare event.
+ */
+__STATIC_INLINE nrf_timer_event_t nrf_timer_compare_event_get(uint32_t channel);
+
+/**
+ * @brief Function for getting a specific timer compare interrupt.
+ *
+ * @param[in] channel Compare channel.
+ *
+ * @return Compare interrupt.
+ */
+__STATIC_INLINE nrf_timer_int_mask_t nrf_timer_compare_int_get(uint32_t channel);
+
+/**
+ * @brief Function for calculating the number of timer ticks for a given time
+ *        (in microseconds) and timer frequency.
+ *
+ * @param[in] time_us   Time in microseconds.
+ * @param[in] frequency Timer frequency.
+ *
+ * @return Number of timer ticks.
+ */
+__STATIC_INLINE uint32_t nrf_timer_us_to_ticks(uint32_t time_us,
+                                               nrf_timer_frequency_t frequency);
+
+/**
+ * @brief Function for calculating the number of timer ticks for a given time
+ *        (in milliseconds) and timer frequency.
+ *
+ * @param[in] time_ms   Time in milliseconds.
+ * @param[in] frequency Timer frequency.
+ *
+ * @return Number of timer ticks.
+ */
+__STATIC_INLINE uint32_t nrf_timer_ms_to_ticks(uint32_t time_ms,
+                                               nrf_timer_frequency_t frequency);
+
+
+#ifndef SUPPRESS_INLINE_IMPLEMENTATION
+
+__STATIC_INLINE void nrf_timer_task_trigger(NRF_TIMER_Type * p_reg,
+                                            nrf_timer_task_t task)
+{
+    *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)task)) = 0x1UL;
+}
+
+__STATIC_INLINE uint32_t * nrf_timer_task_address_get(NRF_TIMER_Type * p_reg,
+                                                      nrf_timer_task_t task)
+{
+    return (uint32_t *)((uint8_t *)p_reg + (uint32_t)task);
+}
+
+__STATIC_INLINE void nrf_timer_event_clear(NRF_TIMER_Type * p_reg,
+                                           nrf_timer_event_t event)
+{
+    *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event)) = 0x0UL;
+#if __CORTEX_M == 0x04
+    volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event));
+    (void)dummy;
+#endif
+}
+
+__STATIC_INLINE bool nrf_timer_event_check(NRF_TIMER_Type * p_reg,
+                                           nrf_timer_event_t event)
+{
+    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
+}
+
+__STATIC_INLINE uint32_t * nrf_timer_event_address_get(NRF_TIMER_Type * p_reg,
+                                                       nrf_timer_event_t event)
+{
+    return (uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
+}
+
+__STATIC_INLINE void nrf_timer_shorts_enable(NRF_TIMER_Type * p_reg,
+                                             uint32_t timer_shorts_mask)
+{
+    p_reg->SHORTS |= timer_shorts_mask;
+}
+
+__STATIC_INLINE void nrf_timer_shorts_disable(NRF_TIMER_Type * p_reg,
+                                              uint32_t timer_shorts_mask)
+{
+    p_reg->SHORTS &= ~(timer_shorts_mask);
+}
+
+__STATIC_INLINE void nrf_timer_int_enable(NRF_TIMER_Type * p_reg,
+                                          uint32_t timer_int_mask)
+{
+    p_reg->INTENSET = timer_int_mask;
+}
+
+__STATIC_INLINE void nrf_timer_int_disable(NRF_TIMER_Type * p_reg,
+                                           uint32_t timer_int_mask)
+{
+    p_reg->INTENCLR = timer_int_mask;
+}
+
+__STATIC_INLINE bool nrf_timer_int_enable_check(NRF_TIMER_Type * p_reg,
+                                                uint32_t timer_int)
+{
+    return (bool)(p_reg->INTENSET & timer_int);
+}
+
+__STATIC_INLINE void nrf_timer_mode_set(NRF_TIMER_Type * p_reg,
+                                        nrf_timer_mode_t mode)
+{
+    p_reg->MODE = (p_reg->MODE & ~TIMER_MODE_MODE_Msk) |
+                    ((mode << TIMER_MODE_MODE_Pos) & TIMER_MODE_MODE_Msk);
+}
+
+__STATIC_INLINE nrf_timer_mode_t nrf_timer_mode_get(NRF_TIMER_Type * p_reg)
+{
+    return (nrf_timer_mode_t)(p_reg->MODE);
+}
+
+__STATIC_INLINE void nrf_timer_bit_width_set(NRF_TIMER_Type * p_reg,
+                                             nrf_timer_bit_width_t bit_width)
+{
+    p_reg->BITMODE = (p_reg->BITMODE & ~TIMER_BITMODE_BITMODE_Msk) |
+                       ((bit_width << TIMER_BITMODE_BITMODE_Pos) &
+                            TIMER_BITMODE_BITMODE_Msk);
+}
+
+__STATIC_INLINE nrf_timer_bit_width_t nrf_timer_bit_width_get(NRF_TIMER_Type * p_reg)
+{
+    return (nrf_timer_bit_width_t)(p_reg->BITMODE);
+}
+
+__STATIC_INLINE void nrf_timer_frequency_set(NRF_TIMER_Type * p_reg,
+                                             nrf_timer_frequency_t frequency)
+{
+    p_reg->PRESCALER = (p_reg->PRESCALER & ~TIMER_PRESCALER_PRESCALER_Msk) |
+                         ((frequency << TIMER_PRESCALER_PRESCALER_Pos) &
+                              TIMER_PRESCALER_PRESCALER_Msk);
+}
+
+__STATIC_INLINE nrf_timer_frequency_t nrf_timer_frequency_get(NRF_TIMER_Type * p_reg)
+{
+    return (nrf_timer_frequency_t)(p_reg->PRESCALER);
+}
+
+__STATIC_INLINE void nrf_timer_cc_write(NRF_TIMER_Type * p_reg,
+                                        nrf_timer_cc_channel_t cc_channel,
+                                        uint32_t               cc_value)
+{
+    p_reg->CC[cc_channel] = cc_value;
+}
+
+__STATIC_INLINE uint32_t nrf_timer_cc_read(NRF_TIMER_Type * p_reg,
+                                           nrf_timer_cc_channel_t cc_channel)
+{
+    return (uint32_t)p_reg->CC[cc_channel];
+}
+
+__STATIC_INLINE nrf_timer_task_t nrf_timer_capture_task_get(uint32_t channel)
+{
+    return (nrf_timer_task_t)
+        ((uint32_t)NRF_TIMER_TASK_CAPTURE0 + (channel * sizeof(uint32_t)));
+}
+
+__STATIC_INLINE nrf_timer_event_t nrf_timer_compare_event_get(uint32_t channel)
+{
+    return (nrf_timer_event_t)
+        ((uint32_t)NRF_TIMER_EVENT_COMPARE0 + (channel * sizeof(uint32_t)));
+}
+
+__STATIC_INLINE nrf_timer_int_mask_t nrf_timer_compare_int_get(uint32_t channel)
+{
+    return (nrf_timer_int_mask_t)
+        ((uint32_t)NRF_TIMER_INT_COMPARE0_MASK << channel);
+}
+
+__STATIC_INLINE uint32_t nrf_timer_us_to_ticks(uint32_t time_us,
+                                               nrf_timer_frequency_t frequency)
+{
+    // The "frequency" parameter here is actually the prescaler value, and the
+    // timer runs at the following frequency: f = 16 MHz / 2^prescaler.
+    uint32_t prescaler = (uint32_t)frequency;
+    ASSERT(time_us <= (UINT32_MAX / 16UL));
+    return ((time_us * 16UL) >> prescaler);
+}
+
+__STATIC_INLINE uint32_t nrf_timer_ms_to_ticks(uint32_t time_ms,
+                                               nrf_timer_frequency_t frequency)
+{
+    // The "frequency" parameter here is actually the prescaler value, and the
+    // timer runs at the following frequency: f = 16000 kHz / 2^prescaler.
+    uint32_t prescaler = (uint32_t)frequency;
+    ASSERT(time_ms <= (UINT32_MAX / 16000UL));
+    return ((time_ms * 16000UL) >> prescaler);
+}
+
+#endif // SUPPRESS_INLINE_IMPLEMENTATION
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_TIMER_H__
+
+/** @} */