mirror of https://github.com/ARMmbed/mbed-os.git
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2019 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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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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#include <stddef.h>
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#include "lp_ticker_api.h"
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#include "PeripheralNames.h"
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#define LP_TICKER_INTERRUPT CMSDK_TIMER0
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#define LP_TICKER_COUNTER CMSDK_TIMER1
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#define LP_TICKER_TIMER_IRQn TIMER0_IRQn
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/* mbed OS HAL API defined lp_ticker as an increment ticker
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* MPS2 platform provided in SSE-200 are decrement tickers
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* with interrupt fired counter reaches 0.
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*
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* So 2 Timers are used to construct mbed OS HAL low power ticker.
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*
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* TIMER0 is for generating interrupts
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* and TIMER0 will turned off when it is generating interrupts
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*
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* TIMER1 is for counting, and returns inverted binary when read from it
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* Because TIMER1 is running at the speed of 25Mhz, it need to be shift by 10,
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* in order to meet mbed HAL lp_ticker definitions
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*
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*/
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static int lp_ticker_inited = 0;
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void lp_ticker_internal_handler(void)
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{
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LP_TICKER_INTERRUPT->CTRL &= ~CMSDK_TIMER_CTRL_IRQEN_Msk;
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LP_TICKER_INTERRUPT->CTRL &= ~CMSDK_TIMER_CTRL_EN_Msk;
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lp_ticker_irq_handler();
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}
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void lp_ticker_init(void)
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{
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if (lp_ticker_inited) {
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lp_ticker_disable_interrupt();
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return;
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}
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LP_TICKER_COUNTER->CTRL = 0x0ul;
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LP_TICKER_INTERRUPT->CTRL = 0x0ul;
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LP_TICKER_COUNTER->RELOAD = 0xFFFFFFFFul;
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LP_TICKER_INTERRUPT->RELOAD = 0xFFFFFFFFul;
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LP_TICKER_COUNTER->CTRL |= CMSDK_TIMER_CTRL_EN_Msk;
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NVIC_SetVector(LP_TICKER_TIMER_IRQn, (uint32_t)lp_ticker_internal_handler);
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lp_ticker_inited = 1;
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}
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void lp_ticker_free(void)
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{
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LP_TICKER_COUNTER->CTRL &= ~CMSDK_TIMER_CTRL_EN_Msk;
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lp_ticker_disable_interrupt();
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lp_ticker_inited = 0;
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}
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uint32_t lp_ticker_read()
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{
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return (~LP_TICKER_COUNTER->VALUE) >> 10;
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}
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void lp_ticker_set_interrupt(timestamp_t timestamp)
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{
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uint32_t delta = (timestamp << 10) - (~LP_TICKER_COUNTER->VALUE);
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LP_TICKER_INTERRUPT->CTRL &= ~CMSDK_TIMER_CTRL_EN_Msk;
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LP_TICKER_INTERRUPT->RELOAD = delta;
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LP_TICKER_INTERRUPT->CTRL |= CMSDK_TIMER_CTRL_IRQEN_Msk;
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LP_TICKER_INTERRUPT->CTRL |= CMSDK_TIMER_CTRL_EN_Msk;
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NVIC_EnableIRQ(LP_TICKER_TIMER_IRQn);
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}
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void lp_ticker_fire_interrupt(void)
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{
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NVIC_EnableIRQ(LP_TICKER_TIMER_IRQn);
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NVIC_SetPendingIRQ(LP_TICKER_TIMER_IRQn);
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}
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void lp_ticker_disable_interrupt(void)
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{
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LP_TICKER_INTERRUPT->CTRL &= ~CMSDK_TIMER_CTRL_IRQEN_Msk;
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LP_TICKER_INTERRUPT->CTRL &= ~CMSDK_TIMER_CTRL_EN_Msk;
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NVIC_DisableIRQ(LP_TICKER_TIMER_IRQn);
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}
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void lp_ticker_clear_interrupt(void)
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{
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LP_TICKER_INTERRUPT->INTCLEAR = CMSDK_TIMER_INTCLEAR_Msk;
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}
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const ticker_info_t *lp_ticker_get_info(void)
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{
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static const ticker_info_t info = {
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24414, // 10 stages scaled from 25MHz (dived by 1024)
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22 // 22 bit counter
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};
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return &info;
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}
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