mirror of https://github.com/ARMmbed/mbed-os.git
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2018 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Low-power elapsed time measure and interval timer in micro-secundum,
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* servicing \ref lp_ticker_api.h, using CMSDK Timer1 \ref CMSDK_TIMER1_DEV.
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*/
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#include <limits.h>
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#include "cmsdk_ticker.h"
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#include "lp_ticker_api.h"
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#include "platform_devices.h"
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/**
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* \brief Calculate clocks to us
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*
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* \param[in] tick Number of clock ticks
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*
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* \return Number of usec, relative to the timer frequency,
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* that a given ammount of ticks equates to.
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*/
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static uint32_t convert_tick_to_us(uint32_t tick)
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{
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return (tick / (SystemCoreClock / SEC_TO_USEC_MULTIPLIER));
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}
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/**
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* \brief Calculate us to clock ticks
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*
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* \param[in] us Time to convert to clock ticks
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*
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* \return Number of clock ticks relative to the timer frequency,
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* that a given period of usec equates to.
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*/
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static uint32_t convert_us_to_tick(uint32_t us)
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{
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return (us * (SystemCoreClock / SEC_TO_USEC_MULTIPLIER));
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}
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static const struct tick_cfg_t cfg =
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{
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.timer_driver = &CMSDK_TIMER1_DEV,
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.irq_n = TIMER1_IRQn,
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.interval_callback = &lp_ticker_irq_handler,
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.convert_tick_to_time = &convert_tick_to_us,
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.convert_time_to_tick = &convert_us_to_tick
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};
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static struct tick_data_t data =
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{
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.is_initialized = false,
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.cumulated_time = 0,
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.max_interval_time = 0,
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.reload_time = 0,
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.interval_callback_enabled = false,
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.previous_cumulated_time = 0,
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.previous_elapsed = 0
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};
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static struct tick_drv_data_t timer_data =
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{
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.cfg = &cfg,
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.data = &data
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};
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void lp_ticker_init(void)
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{
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cmsdk_ticker_init(&timer_data);
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}
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uint32_t lp_ticker_read()
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{
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return cmsdk_ticker_read(&timer_data);
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}
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void lp_ticker_set_interrupt(timestamp_t timestamp)
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{
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cmsdk_ticker_set_interrupt(&timer_data, timestamp);
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}
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void lp_ticker_disable_interrupt(void)
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{
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cmsdk_ticker_disable_interrupt(&timer_data);
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}
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void lp_ticker_clear_interrupt(void)
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{
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cmsdk_ticker_clear_interrupt(&timer_data);
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}
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void lp_ticker_fire_interrupt(void)
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{
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cmsdk_ticker_fire_interrupt(&timer_data);
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}
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void TIMER1_IRQHandler(void)
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{
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cmsdk_ticker_irq_handler(&timer_data);
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}
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