213a6b4244
* merged: nrf tree from unicore-mx * fixed: small changes to make merged code play with rest of locm3 again * added: linker script generator defines for nRF51/52 stubs * added: doxygen support This removes code and changes names and styles where relevant to be more inline with normal libopencm3. NRF52x library is built for hardfloat, M4F by default. The M4 no float variants are less common, and if needed, the library can be built manually for those variants. Unless some very common boards show up using those parts, we don't need an extra library build. Reviewed-by: Karl Palsson <karlp@tweak.net.au> Tested-by: Karl Palsson <karlp@tweak.net.au>
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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