577 lines
21 KiB
C
577 lines
21 KiB
C
/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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/**
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* @defgroup nrf_timer_hal Timer HAL
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* @{
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* @ingroup nrf_timer
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*
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* @brief Hardware access layer for accessing the timer peripheral.
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*/
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#ifndef NRF_TIMER_H__
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#define NRF_TIMER_H__
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "nrf.h"
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#include "nrf_assert.h"
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/**
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* @brief Macro for validating the correctness of the BIT_WIDTH setting.
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*/
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#ifdef NRF51
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/**
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* In the nRF51 Series, timer instance 0 supports all available bit widths.
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* The other two instances support only 8 and 16 bits.
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*/
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#define NRF_TIMER_IS_BIT_WIDTH_VALID(p_timer, bit_width) \
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((p_timer == NRF_TIMER0) || (bit_width <= NRF_TIMER_BIT_WIDTH_16))
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#else
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/**
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* In the nRF52 Series, all timer instances support all available bit widths.
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*/
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#define NRF_TIMER_IS_BIT_WIDTH_VALID(p_timer, bit_width) true
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#endif
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/**
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* @brief Macro for getting the number of capture/compare channels available
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* in a given timer instance.
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*/
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#ifdef NRF51
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#define NRF_TIMER_CC_CHANNEL_COUNT(id) 4
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#else
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#define NRF_TIMER_CC_CHANNEL_COUNT(id) ((id) <= 2 ? 4 : 6)
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#endif
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/**
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* @brief Timer tasks.
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*/
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typedef enum
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{
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/*lint -save -e30 -esym(628,__INTADDR__)*/
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NRF_TIMER_TASK_START = offsetof(NRF_TIMER_Type, TASKS_START), ///< Task for starting the timer.
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NRF_TIMER_TASK_STOP = offsetof(NRF_TIMER_Type, TASKS_STOP), ///< Task for stopping the timer.
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NRF_TIMER_TASK_COUNT = offsetof(NRF_TIMER_Type, TASKS_COUNT), ///< Task for incrementing the timer (in counter mode).
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NRF_TIMER_TASK_CLEAR = offsetof(NRF_TIMER_Type, TASKS_CLEAR), ///< Task for resetting the timer value.
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NRF_TIMER_TASK_SHUTDOWN = offsetof(NRF_TIMER_Type, TASKS_SHUTDOWN), ///< Task for powering off the timer.
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NRF_TIMER_TASK_CAPTURE0 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[0]), ///< Task for capturing the timer value on channel 0.
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NRF_TIMER_TASK_CAPTURE1 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[1]), ///< Task for capturing the timer value on channel 1.
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NRF_TIMER_TASK_CAPTURE2 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[2]), ///< Task for capturing the timer value on channel 2.
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NRF_TIMER_TASK_CAPTURE3 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[3]), ///< Task for capturing the timer value on channel 3.
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#ifdef NRF52
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NRF_TIMER_TASK_CAPTURE4 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[4]), ///< Task for capturing the timer value on channel 4.
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NRF_TIMER_TASK_CAPTURE5 = offsetof(NRF_TIMER_Type, TASKS_CAPTURE[5]), ///< Task for capturing the timer value on channel 5.
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#endif
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/*lint -restore*/
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} nrf_timer_task_t;
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/**
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* @brief Timer events.
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*/
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typedef enum
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{
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/*lint -save -e30*/
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NRF_TIMER_EVENT_COMPARE0 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[0]), ///< Event from compare channel 0.
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NRF_TIMER_EVENT_COMPARE1 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[1]), ///< Event from compare channel 1.
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NRF_TIMER_EVENT_COMPARE2 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[2]), ///< Event from compare channel 2.
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NRF_TIMER_EVENT_COMPARE3 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[3]), ///< Event from compare channel 3.
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#ifdef NRF52
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NRF_TIMER_EVENT_COMPARE4 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[4]), ///< Event from compare channel 4.
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NRF_TIMER_EVENT_COMPARE5 = offsetof(NRF_TIMER_Type, EVENTS_COMPARE[5]), ///< Event from compare channel 5.
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#endif
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/*lint -restore*/
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} nrf_timer_event_t;
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/**
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* @brief Types of timer shortcuts.
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*/
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typedef enum
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{
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NRF_TIMER_SHORT_COMPARE0_STOP_MASK = TIMER_SHORTS_COMPARE0_STOP_Msk, ///< Shortcut for stopping the timer based on compare 0.
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NRF_TIMER_SHORT_COMPARE1_STOP_MASK = TIMER_SHORTS_COMPARE1_STOP_Msk, ///< Shortcut for stopping the timer based on compare 1.
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NRF_TIMER_SHORT_COMPARE2_STOP_MASK = TIMER_SHORTS_COMPARE2_STOP_Msk, ///< Shortcut for stopping the timer based on compare 2.
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NRF_TIMER_SHORT_COMPARE3_STOP_MASK = TIMER_SHORTS_COMPARE3_STOP_Msk, ///< Shortcut for stopping the timer based on compare 3.
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#ifdef NRF52
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NRF_TIMER_SHORT_COMPARE4_STOP_MASK = TIMER_SHORTS_COMPARE4_STOP_Msk, ///< Shortcut for stopping the timer based on compare 4.
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NRF_TIMER_SHORT_COMPARE5_STOP_MASK = TIMER_SHORTS_COMPARE5_STOP_Msk, ///< Shortcut for stopping the timer based on compare 5.
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#endif
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NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK = TIMER_SHORTS_COMPARE0_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 0.
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NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK = TIMER_SHORTS_COMPARE1_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 1.
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NRF_TIMER_SHORT_COMPARE2_CLEAR_MASK = TIMER_SHORTS_COMPARE2_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 2.
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NRF_TIMER_SHORT_COMPARE3_CLEAR_MASK = TIMER_SHORTS_COMPARE3_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 3.
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#ifdef NRF52
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NRF_TIMER_SHORT_COMPARE4_CLEAR_MASK = TIMER_SHORTS_COMPARE4_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 4.
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NRF_TIMER_SHORT_COMPARE5_CLEAR_MASK = TIMER_SHORTS_COMPARE5_CLEAR_Msk, ///< Shortcut for clearing the timer based on compare 5.
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#endif
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} nrf_timer_short_mask_t;
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/**
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* @brief Timer modes.
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*/
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typedef enum
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{
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NRF_TIMER_MODE_TIMER = TIMER_MODE_MODE_Timer, ///< Timer mode: timer.
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NRF_TIMER_MODE_COUNTER = TIMER_MODE_MODE_Counter, ///< Timer mode: counter.
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#ifdef NRF52
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NRF_TIMER_MODE_LOW_POWER_COUNTER = TIMER_MODE_MODE_LowPowerCounter, ///< Timer mode: low-power counter.
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#endif
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} nrf_timer_mode_t;
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/**
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* @brief Timer bit width.
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*/
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typedef enum
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{
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NRF_TIMER_BIT_WIDTH_8 = TIMER_BITMODE_BITMODE_08Bit, ///< Timer bit width 8 bit.
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NRF_TIMER_BIT_WIDTH_16 = TIMER_BITMODE_BITMODE_16Bit, ///< Timer bit width 16 bit.
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NRF_TIMER_BIT_WIDTH_24 = TIMER_BITMODE_BITMODE_24Bit, ///< Timer bit width 24 bit.
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NRF_TIMER_BIT_WIDTH_32 = TIMER_BITMODE_BITMODE_32Bit ///< Timer bit width 32 bit.
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} nrf_timer_bit_width_t;
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/**
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* @brief Timer prescalers.
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*/
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typedef enum
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{
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NRF_TIMER_FREQ_16MHz = 0, ///< Timer frequency 16 MHz.
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NRF_TIMER_FREQ_8MHz, ///< Timer frequency 8 MHz.
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NRF_TIMER_FREQ_4MHz, ///< Timer frequency 4 MHz.
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NRF_TIMER_FREQ_2MHz, ///< Timer frequency 2 MHz.
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NRF_TIMER_FREQ_1MHz, ///< Timer frequency 1 MHz.
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NRF_TIMER_FREQ_500kHz, ///< Timer frequency 500 kHz.
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NRF_TIMER_FREQ_250kHz, ///< Timer frequency 250 kHz.
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NRF_TIMER_FREQ_125kHz, ///< Timer frequency 125 kHz.
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NRF_TIMER_FREQ_62500Hz, ///< Timer frequency 62500 Hz.
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NRF_TIMER_FREQ_31250Hz ///< Timer frequency 31250 Hz.
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} nrf_timer_frequency_t;
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/**
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* @brief Timer capture/compare channels.
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*/
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typedef enum
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{
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NRF_TIMER_CC_CHANNEL0 = 0, ///< Timer capture/compare channel 0.
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NRF_TIMER_CC_CHANNEL1, ///< Timer capture/compare channel 1.
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NRF_TIMER_CC_CHANNEL2, ///< Timer capture/compare channel 2.
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NRF_TIMER_CC_CHANNEL3, ///< Timer capture/compare channel 3.
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#ifdef NRF52
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NRF_TIMER_CC_CHANNEL4, ///< Timer capture/compare channel 4.
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NRF_TIMER_CC_CHANNEL5, ///< Timer capture/compare channel 5.
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#endif
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} nrf_timer_cc_channel_t;
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/**
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* @brief Timer interrupts.
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*/
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typedef enum
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{
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NRF_TIMER_INT_COMPARE0_MASK = TIMER_INTENSET_COMPARE0_Msk, ///< Timer interrupt from compare event on channel 0.
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NRF_TIMER_INT_COMPARE1_MASK = TIMER_INTENSET_COMPARE1_Msk, ///< Timer interrupt from compare event on channel 1.
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NRF_TIMER_INT_COMPARE2_MASK = TIMER_INTENSET_COMPARE2_Msk, ///< Timer interrupt from compare event on channel 2.
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NRF_TIMER_INT_COMPARE3_MASK = TIMER_INTENSET_COMPARE3_Msk, ///< Timer interrupt from compare event on channel 3.
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#ifdef NRF52
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NRF_TIMER_INT_COMPARE4_MASK = TIMER_INTENSET_COMPARE4_Msk, ///< Timer interrupt from compare event on channel 4.
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NRF_TIMER_INT_COMPARE5_MASK = TIMER_INTENSET_COMPARE5_Msk, ///< Timer interrupt from compare event on channel 5.
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#endif
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} nrf_timer_int_mask_t;
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/**
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* @brief Function for activating a specific timer task.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] task Task to activate.
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*/
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__STATIC_INLINE void nrf_timer_task_trigger(NRF_TIMER_Type * p_timer,
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nrf_timer_task_t task);
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/**
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* @brief Function for getting the address of a specific timer task register.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] task Requested task.
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*
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* @return Address of the specified task register.
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*/
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__STATIC_INLINE uint32_t * nrf_timer_task_address_get(NRF_TIMER_Type * p_timer,
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nrf_timer_task_t task);
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/**
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* @brief Function for clearing a specific timer event.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] event Event to clear.
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*/
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__STATIC_INLINE void nrf_timer_event_clear(NRF_TIMER_Type * p_timer,
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nrf_timer_event_t event);
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/**
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* @brief Function for checking the state of a specific timer event.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] event Event to check.
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*
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* @retval true If the event is set.
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* @retval false If the event is not set.
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*/
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__STATIC_INLINE bool nrf_timer_event_check(NRF_TIMER_Type * p_timer,
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nrf_timer_event_t event);
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/**
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* @brief Function for getting the address of a specific timer event register.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] event Requested event.
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*
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* @return Address of the specified event register.
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*/
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__STATIC_INLINE uint32_t * nrf_timer_event_address_get(NRF_TIMER_Type * p_timer,
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nrf_timer_event_t event);
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/**
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* @brief Function for enabling specified shortcuts.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] timer_shorts_mask Shortcuts to enable.
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*/
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__STATIC_INLINE void nrf_timer_shorts_enable(NRF_TIMER_Type * p_timer,
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uint32_t timer_shorts_mask);
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/**
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* @brief Function for disabling specified shortcuts.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] timer_shorts_mask Shortcuts to disable.
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*/
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__STATIC_INLINE void nrf_timer_shorts_disable(NRF_TIMER_Type * p_timer,
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uint32_t timer_shorts_mask);
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/**
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* @brief Function for enabling specified interrupts.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] timer_int_mask Interrupts to enable.
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*/
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__STATIC_INLINE void nrf_timer_int_enable(NRF_TIMER_Type * p_timer,
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uint32_t timer_int_mask);
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/**
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* @brief Function for disabling specified interrupts.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] timer_int_mask Interrupts to disable.
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*/
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__STATIC_INLINE void nrf_timer_int_disable(NRF_TIMER_Type * p_timer,
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uint32_t timer_int_mask);
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/**
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* @brief Function for retrieving the state of a given interrupt.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] timer_int Interrupt to check.
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*
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* @retval true If the interrupt is enabled.
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* @retval false If the interrupt is not enabled.
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*/
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__STATIC_INLINE bool nrf_timer_int_enable_check(NRF_TIMER_Type * p_timer,
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uint32_t timer_int);
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/**
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* @brief Function for setting the timer mode.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] mode Timer mode.
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*/
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__STATIC_INLINE void nrf_timer_mode_set(NRF_TIMER_Type * p_timer,
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nrf_timer_mode_t mode);
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/**
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* @brief Function for retrieving the timer mode.
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*
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* @param[in] p_timer Timer instance.
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*
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* @return Timer mode.
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*/
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__STATIC_INLINE nrf_timer_mode_t nrf_timer_mode_get(NRF_TIMER_Type * p_timer);
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/**
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* @brief Function for setting the timer bit width.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] bit_width Timer bit width.
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*/
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__STATIC_INLINE void nrf_timer_bit_width_set(NRF_TIMER_Type * p_timer,
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nrf_timer_bit_width_t bit_width);
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/**
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* @brief Function for retrieving the timer bit width.
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*
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* @param[in] p_timer Timer instance.
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*
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* @return Timer bit width.
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*/
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__STATIC_INLINE nrf_timer_bit_width_t nrf_timer_bit_width_get(NRF_TIMER_Type * p_timer);
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/**
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* @brief Function for setting the timer frequency.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] frequency Timer frequency.
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*/
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__STATIC_INLINE void nrf_timer_frequency_set(NRF_TIMER_Type * p_timer,
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nrf_timer_frequency_t frequency);
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/**
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* @brief Function for retrieving the timer frequency.
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*
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* @param[in] p_timer Timer instance.
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*
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* @return Timer frequency.
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*/
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__STATIC_INLINE nrf_timer_frequency_t nrf_timer_frequency_get(NRF_TIMER_Type * p_timer);
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/**
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* @brief Function for writing the capture/compare register for a specified channel.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] cc_channel Requested capture/compare channel.
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* @param[in] cc_value Value to write to the capture/compare register.
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*/
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__STATIC_INLINE void nrf_timer_cc_write(NRF_TIMER_Type * p_timer,
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nrf_timer_cc_channel_t cc_channel,
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uint32_t cc_value);
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/**
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* @brief Function for retrieving the capture/compare value for a specified channel.
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*
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* @param[in] p_timer Timer instance.
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* @param[in] cc_channel Requested capture/compare channel.
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*
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* @return Value from the requested capture/compare register.
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*/
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__STATIC_INLINE uint32_t nrf_timer_cc_read(NRF_TIMER_Type * p_timer,
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nrf_timer_cc_channel_t cc_channel);
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/**
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* @brief Function for getting a specific timer capture task.
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*
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* @param[in] channel Capture channel.
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*
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* @return Capture task.
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*/
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__STATIC_INLINE nrf_timer_task_t nrf_timer_capture_task_get(uint32_t channel);
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/**
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* @brief Function for getting a specific timer compare event.
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*
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* @param[in] channel Compare channel.
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*
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* @return Compare event.
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*/
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__STATIC_INLINE nrf_timer_event_t nrf_timer_compare_event_get(uint32_t channel);
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/**
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* @brief Function for getting a specific timer compare interrupt.
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*
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* @param[in] channel Compare channel.
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*
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* @return Compare interrupt.
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*/
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__STATIC_INLINE nrf_timer_int_mask_t nrf_timer_compare_int_get(uint32_t channel);
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/**
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* @brief Function for calculating the number of timer ticks for a given time
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* (in microseconds) and timer frequency.
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*
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* @param[in] time_us Time in microseconds.
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* @param[in] frequency Timer frequency.
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*
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* @return Number of timer ticks.
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*/
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__STATIC_INLINE uint32_t nrf_timer_us_to_ticks(uint32_t time_us,
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nrf_timer_frequency_t frequency);
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/**
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* @brief Function for calculating the number of timer ticks for a given time
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* (in milliseconds) and timer frequency.
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*
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* @param[in] time_ms Time in milliseconds.
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* @param[in] frequency Timer frequency.
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*
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* @return Number of timer ticks.
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*/
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__STATIC_INLINE uint32_t nrf_timer_ms_to_ticks(uint32_t time_ms,
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nrf_timer_frequency_t frequency);
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#ifndef SUPPRESS_INLINE_IMPLEMENTATION
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__STATIC_INLINE void nrf_timer_task_trigger(NRF_TIMER_Type * p_timer,
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nrf_timer_task_t task)
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{
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*((volatile uint32_t *)((uint8_t *)p_timer + (uint32_t)task)) = 0x1UL;
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}
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__STATIC_INLINE uint32_t * nrf_timer_task_address_get(NRF_TIMER_Type * p_timer,
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nrf_timer_task_t task)
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{
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return (uint32_t *)((uint8_t *)p_timer + (uint32_t)task);
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}
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__STATIC_INLINE void nrf_timer_event_clear(NRF_TIMER_Type * p_timer,
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nrf_timer_event_t event)
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{
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*((volatile uint32_t *)((uint8_t *)p_timer + (uint32_t)event)) = 0x0UL;
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}
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|
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__STATIC_INLINE bool nrf_timer_event_check(NRF_TIMER_Type * p_timer,
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|
nrf_timer_event_t event)
|
|
{
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|
return (bool)*(volatile uint32_t *)((uint8_t *)p_timer + (uint32_t)event);
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|
}
|
|
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__STATIC_INLINE uint32_t * nrf_timer_event_address_get(NRF_TIMER_Type * p_timer,
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|
nrf_timer_event_t event)
|
|
{
|
|
return (uint32_t *)((uint8_t *)p_timer + (uint32_t)event);
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|
}
|
|
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__STATIC_INLINE void nrf_timer_shorts_enable(NRF_TIMER_Type * p_timer,
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|
uint32_t timer_shorts_mask)
|
|
{
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|
p_timer->SHORTS |= timer_shorts_mask;
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|
}
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|
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|
__STATIC_INLINE void nrf_timer_shorts_disable(NRF_TIMER_Type * p_timer,
|
|
uint32_t timer_shorts_mask)
|
|
{
|
|
p_timer->SHORTS &= ~(timer_shorts_mask);
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|
}
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|
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|
__STATIC_INLINE void nrf_timer_int_enable(NRF_TIMER_Type * p_timer,
|
|
uint32_t timer_int_mask)
|
|
{
|
|
p_timer->INTENSET = timer_int_mask;
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|
}
|
|
|
|
__STATIC_INLINE void nrf_timer_int_disable(NRF_TIMER_Type * p_timer,
|
|
uint32_t timer_int_mask)
|
|
{
|
|
p_timer->INTENCLR = timer_int_mask;
|
|
}
|
|
|
|
__STATIC_INLINE bool nrf_timer_int_enable_check(NRF_TIMER_Type * p_timer,
|
|
uint32_t timer_int)
|
|
{
|
|
return (bool)(p_timer->INTENSET & timer_int);
|
|
}
|
|
|
|
__STATIC_INLINE void nrf_timer_mode_set(NRF_TIMER_Type * p_timer,
|
|
nrf_timer_mode_t mode)
|
|
{
|
|
p_timer->MODE = (p_timer->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_timer)
|
|
{
|
|
return (nrf_timer_mode_t)(p_timer->MODE);
|
|
}
|
|
|
|
__STATIC_INLINE void nrf_timer_bit_width_set(NRF_TIMER_Type * p_timer,
|
|
nrf_timer_bit_width_t bit_width)
|
|
{
|
|
p_timer->BITMODE = (p_timer->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_timer)
|
|
{
|
|
return (nrf_timer_bit_width_t)(p_timer->BITMODE);
|
|
}
|
|
|
|
__STATIC_INLINE void nrf_timer_frequency_set(NRF_TIMER_Type * p_timer,
|
|
nrf_timer_frequency_t frequency)
|
|
{
|
|
p_timer->PRESCALER = (p_timer->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_timer)
|
|
{
|
|
return (nrf_timer_frequency_t)(p_timer->PRESCALER);
|
|
}
|
|
|
|
__STATIC_INLINE void nrf_timer_cc_write(NRF_TIMER_Type * p_timer,
|
|
nrf_timer_cc_channel_t cc_channel,
|
|
uint32_t cc_value)
|
|
{
|
|
p_timer->CC[cc_channel] = cc_value;
|
|
}
|
|
|
|
__STATIC_INLINE uint32_t nrf_timer_cc_read(NRF_TIMER_Type * p_timer,
|
|
nrf_timer_cc_channel_t cc_channel)
|
|
{
|
|
return (uint32_t)p_timer->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
|
|
|
|
#endif // NRF_TIMER_H__
|
|
|
|
/** @} */
|