90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/** @addtogroup ostick_defines
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*
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* @brief <b>Access functions for the NRF51 Clock Controller </b>
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* @ingroup NRF51_defines
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2016
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* Roel Postelmans <postelmansroel@gmail.com>
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*
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*/
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/*
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* This file is part of the unicore-mx project.
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <unicore-mx/nrf/ostick.h>
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#include <unicore-mx/nrf/rtc.h>
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#include <unicore-mx/nrf/gpio.h>
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#include <unicore-mx/nrf/clock.h>
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#include <unicore-mx/nrf/periph.h>
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#define OSTICK_PRESCALE_MS_SHIFT 5
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#ifdef OSTICK_USE_RTC0
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#define OSTICK_TIMER RTC0
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#define ostick_isr rtc0_isr
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#define OSTICK_NVIC NVIC_RTC0_IRQ
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#elif defined(OSTICK_USE_RTC1)
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#define OSTICK_TIMER RTC1
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#define ostick_isr rtc1_isr
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#define OSTICK_NVIC NVIC_RTC1_IRQ
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#elif defined(OSTICK_USE_RTC2)
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#define OSTICK_TIMER RTC2
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#define ostick_isr rtc2_isr
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#define OSTICK_NVIC NVIC_RTC2_IRQ
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#else
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#define OSTICK_TIMER RTC0
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#define ostick_isr rtc0_isr
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#define OSTICK_NVIC NVIC_RTC0_IRQ
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#endif
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void (*_ostick_handler)(void);
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/** @brief Initialize the ostick
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*
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* @param[in] interval_ms: The interval of the ostick in ms
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*/
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void ostick_init(uint16_t interval_ms, void (*ostick_handler)(void))
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{
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nvic_set_priority(OSTICK_NVIC, 0);
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_ostick_handler = ostick_handler;
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clock_start_lfclk(1);
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rtc_set_prescaler(OSTICK_TIMER, interval_ms<<OSTICK_PRESCALE_MS_SHIFT);
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}
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/** @brief Start the ostick */
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void ostick_start()
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{
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periph_enable_irq(OSTICK_TIMER);
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rtc_enable_interrupt(OSTICK_TIMER, RTC_INTEN_TICK);
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rtc_enable_events(OSTICK_TIMER, RTC_INTEN_TICK);
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rtc_start(OSTICK_TIMER);
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}
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/** @brief Ostick interupt routine */
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void ostick_isr()
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{
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RTC_EVENT_TICK(OSTICK_TIMER) = 0;
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(*_ostick_handler)();
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}
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/** @brief Stop the ostick */
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void ostick_stop()
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{
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periph_disable_irq(OSTICK_TIMER);
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rtc_disable_interrupt(OSTICK_TIMER, RTC_INTEN_TICK);
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rtc_stop(OSTICK_TIMER);
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}
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