Arti Zirk
054740c5de
subrepo: subdir: "libopencm3" merged: "88e91c9a7cce" upstream: origin: "https://github.com/libopencm3/libopencm3.git" branch: "master" commit: "88e91c9a7cce" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/** @addtogroup timer_file TIMER peripheral API
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*
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* @brief <b>Access functions for the Timer/Counter </b>
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*
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* @ingroup peripheral_apis
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2016
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* Maxim Sloyko <maxims@google.com>
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*
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2017-2018 Unicore MX project<dev(at)lists(dot)unicore-mx(dot)org>
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* Copyright (C) 2021 Eduard Drusa <ventyl86(at)netkosice(dot)sk>
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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 <libopencm3/nrf/timer.h>
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#include <libopencm3/nrf/clock.h>
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/**@{*/
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/** @brief Get timer ticks
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*
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* @param[in] timer uint32_t timer base
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* @returns current ticks value
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*/
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uint32_t timer_get_ticks(uint32_t timer)
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{
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uint32_t ticks;
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uint32_t cc;
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/* TODO: Check WTF is this doing? */
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cc = TIMER_CC(0, 0);
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TIMER_TASK_CAPTURE(timer, 0) = 1;
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ticks = TIMER_CC(timer, 0);
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TIMER_CC(timer, 0) = cc;
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return ticks;
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}
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/** @brief Set timer mode (counter/timer)
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*
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* @param[in] timer uint32_t timer base
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* @param[in] mode enum timer_mode
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*/
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void timer_set_mode(uint32_t timer, enum timer_mode mode)
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{
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TIMER_MODE(timer) = mode;
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}
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/** @brief Set timer bit mode (width)
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*
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* @param[in] timer uint32_t timer base
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* @param[in] bitmode enum timer_bitmode
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*/
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void timer_set_bitmode(uint32_t timer, enum timer_bitmode bitmode)
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{
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TIMER_BITMODE(timer) = bitmode;
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}
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/** @brief Start the timer
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*
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* @param[in] timer uint32_t timer base
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*/
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void timer_start(uint32_t timer)
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{
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PERIPH_TRIGGER_TASK(TIMER_TASK_START(timer));
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}
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/** @brief Stop the timer
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*
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* @param[in] timer uint32_t timer base
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*/
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void timer_stop(uint32_t timer)
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{
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PERIPH_TRIGGER_TASK(TIMER_TASK_STOP(timer));
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}
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/** @brief Clear the timer
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*
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* @param[in] timer uint32_t timer base
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*/
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void timer_clear(uint32_t timer)
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{
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PERIPH_TRIGGER_TASK(TIMER_TASK_CLEAR(timer));
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}
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/** @brief Set prescaler value
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*
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* @param[in] timer uint32_t timer base
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* @param[in] presc uint8_t prescaler value
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*/
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void timer_set_prescaler(uint32_t timer, uint8_t presc)
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{
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TIMER_PRESCALER(timer) = presc & TIMER_PRESCALER_MASK;
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}
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/** @brief Set compare register
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*
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* @param[in] timer uint32_t timer base
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* @param[in] compare_num uint8_t compare number (0-3)
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* @param[in] compare_val uint32_t compare value
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*/
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void timer_set_compare(uint32_t timer, uint8_t compare_num, uint32_t compare_val)
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{
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if (compare_num > 3) {
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return;
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}
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TIMER_CC(timer, compare_num) = compare_val;
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}
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/** @brief Get the timer tick frequency
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*
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* @param[in] timer uint32_t timer base
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* @returns frequency of ticking
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*/
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uint32_t timer_get_freq(uint32_t timer)
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{
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return CLOCK_PCLK/(1<<TIMER_PRESCALER(timer));
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}
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/** @brief Get compare register
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*
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* @param[in] timer uint32_t timer base
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* @param[in] compare_num uint8_t compare number (0-3)
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* @returns compare register value
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*/
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uint32_t timer_get_cc(uint32_t timer, uint8_t compare_num)
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{
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return TIMER_CC(timer, compare_num);
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}
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/**@}*/
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