mirror of https://github.com/ARMmbed/mbed-os.git
109 lines
4.3 KiB
C
109 lines
4.3 KiB
C
/*
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* Copyright (c) 2020 SparkFun Electronics
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "lp_ticker_api.h"
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#include "lp_ticker_defines.h"
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#include "platform/mbed_critical.h"
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#if DEVICE_LPTICKER
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static bool lp_ticker_initialized = false;
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/* LP ticker is driven by 32kHz clock and counter length is 24 bits. */
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const ticker_info_t *lp_ticker_get_info()
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{
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static const ticker_info_t info = {
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LP_TICKER_FREQ,
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LP_TICKER_BITS
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};
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return &info;
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}
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void lp_ticker_init(void)
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{
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if (lp_ticker_initialized) {
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lp_ticker_disable_interrupt();
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return;
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}
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am_hal_ctimer_int_register(LP_TICKER_AM_HAL_CTIMER_CMPR_INT, lp_ticker_irq_handler);
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am_hal_ctimer_config_single(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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LP_TICKER_AM_HAL_CTIMER_SEGMENT_TIME_KEEPER,
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(LP_TICKER_AM_HAL_CTIMER_TIME_KEEPER_FN | LP_TICKER_AM_HAL_CTIMER_SRC));
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am_hal_ctimer_config_single(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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LP_TICKER_AM_HAL_CTIMER_SEGMENT_INT_COUNTER,
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(LP_TICKER_AM_HAL_CTIMER_INT_COUNTER_FN | LP_TICKER_AM_HAL_CTIMER_SRC | AM_HAL_CTIMER_INT_ENABLE));
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am_hal_ctimer_int_enable(LP_TICKER_AM_HAL_CTIMER_CMPR_INT);
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NVIC_EnableIRQ(CTIMER_IRQn);
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am_hal_ctimer_start(LP_TICKER_AM_HAL_CTIMER_NUMBER, LP_TICKER_AM_HAL_CTIMER_SEGMENT_TIME_KEEPER);
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lp_ticker_initialized = true;
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}
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void lp_ticker_free(void)
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{
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am_hal_ctimer_stop(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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LP_TICKER_AM_HAL_CTIMER_SEGMENT_TIME_KEEPER);
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am_hal_ctimer_clear(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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LP_TICKER_AM_HAL_CTIMER_SEGMENT_TIME_KEEPER);
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lp_ticker_initialized = false;
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}
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uint32_t lp_ticker_read()
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{
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return am_hal_ctimer_read(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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LP_TICKER_AM_HAL_CTIMER_SEGMENT_TIME_KEEPER);
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}
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void lp_ticker_set_interrupt(timestamp_t timestamp)
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{
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am_hal_ctimer_int_enable(LP_TICKER_AM_HAL_CTIMER_CMPR_INT);
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am_hal_ctimer_clear(LP_TICKER_AM_HAL_CTIMER_NUMBER, LP_TICKER_AM_HAL_CTIMER_SEGMENT_INT_COUNTER);
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// am_hal_ctimer_config_single(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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// LP_TICKER_AM_HAL_CTIMER_SEGMENT_INT_COUNTER,
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// (LP_TICKER_AM_HAL_CTIMER_INT_COUNTER_FN | LP_TICKER_AM_HAL_CTIMER_SRC | AM_HAL_CTIMER_INT_ENABLE | CTIMER_CTRL0_TMRA0IE1_Msk));
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am_hal_ctimer_start(LP_TICKER_AM_HAL_CTIMER_NUMBER, LP_TICKER_AM_HAL_CTIMER_SEGMENT_INT_COUNTER);
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uint32_t delta = (uint32_t)timestamp - lp_ticker_read();
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am_hal_ctimer_compare_set(LP_TICKER_AM_HAL_CTIMER_NUMBER,
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LP_TICKER_AM_HAL_CTIMER_SEGMENT_INT_COUNTER,
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LP_TICKER_AM_HAL_CTIMER_CMPR_REG,
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(uint32_t)delta);
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}
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void lp_ticker_fire_interrupt(void)
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{
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am_hal_ctimer_int_enable(LP_TICKER_AM_HAL_CTIMER_CMPR_INT);
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am_hal_ctimer_int_set(LP_TICKER_AM_HAL_CTIMER_CMPR_INT);
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}
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void lp_ticker_disable_interrupt(void)
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{
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am_hal_ctimer_int_disable(LP_TICKER_AM_HAL_CTIMER_CMPR_INT);
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}
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void lp_ticker_clear_interrupt(void)
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{
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am_hal_ctimer_int_clear(LP_TICKER_AM_HAL_CTIMER_CMPR_INT);
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}
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#endif // DEVICE_LPTICKER
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