mirror of https://github.com/ARMmbed/mbed-os.git
117 lines
4.2 KiB
C
117 lines
4.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2018 ARM Limited
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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 "us_ticker_api.h"
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#include "PeripheralNames.h"
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#define US_TICKER_TIMER1 CMSDK_DUALTIMER1
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#define US_TICKER_TIMER2 CMSDK_DUALTIMER2
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#define US_TICKER_TIMER_IRQn DUALTIMER_IRQn
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/** mbed OS HAL API defined us_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 ticker.
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*
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* TIMER1 is for counting, and returns inverted binary when read from it
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* TIMER1 will be kept in free-running mode (default, and not generate interrupts)
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*
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* TIMER2 is for generating interrupts
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* So TIMER2 is set to periodic mode, which start decrement counting form LOADVALUE generates interrupts at 0
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* and TIMER2 also set into one-shot mode, which counter halts when is reaches 0
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*/
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static int us_ticker_inited = 0;
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void us_ticker_init(void)
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{
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if (us_ticker_inited) {
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us_ticker_disable_interrupt();
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return;
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}
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US_TICKER_TIMER1->TimerControl = 0x0ul; // disable TIMER1 and reset all control
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US_TICKER_TIMER2->TimerControl = 0x0ul; // disable TIMER2 and reset all control
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US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFFul;
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US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFFul;
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US_TICKER_TIMER1->TimerControl |= CMSDK_DUALTIMER1_CTRL_SIZE_Msk; // set TIMER1 to 32 bit counter
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US_TICKER_TIMER2->TimerControl |= CMSDK_DUALTIMER2_CTRL_SIZE_Msk; // set TIMER2 to 32 bit counter
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US_TICKER_TIMER1->TimerControl |= 0x1 << CMSDK_DUALTIMER1_CTRL_PRESCALE_Pos; // set TIMER1 with 4 stages prescale
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US_TICKER_TIMER2->TimerControl |= 0x1 << CMSDK_DUALTIMER2_CTRL_PRESCALE_Pos; // set TIMER2 with 4 stages prescale
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US_TICKER_TIMER2->TimerControl |= CMSDK_DUALTIMER2_CTRL_MODE_Msk; // set TIMER2 periodic mode
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US_TICKER_TIMER2->TimerControl |= CMSDK_DUALTIMER2_CTRL_ONESHOOT_Msk; // set TIMER2 one-shot mode
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US_TICKER_TIMER1->TimerControl |= CMSDK_DUALTIMER1_CTRL_EN_Msk; // enable TIMER1 counter
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NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
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us_ticker_inited = 1;
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}
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void us_ticker_free(void)
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{
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US_TICKER_TIMER1->TimerControl &= ~CMSDK_DUALTIMER1_CTRL_EN_Msk; // disable TIMER1
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US_TICKER_TIMER2->TimerControl &= ~CMSDK_DUALTIMER2_CTRL_EN_Msk; // disable TIMER2
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us_ticker_disable_interrupt();
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us_ticker_inited = 0;
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}
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uint32_t us_ticker_read()
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{
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return ~US_TICKER_TIMER1->TimerValue;
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}
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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uint32_t delta = timestamp - us_ticker_read();
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US_TICKER_TIMER2->TimerControl &= ~CMSDK_DUALTIMER2_CTRL_EN_Msk; // disable TIMER2
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US_TICKER_TIMER2->TimerLoad = delta; // Set TIMER2 load value
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US_TICKER_TIMER2->TimerControl |= CMSDK_DUALTIMER2_CTRL_INTEN_Msk; // enable TIMER2 interrupt
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US_TICKER_TIMER2->TimerControl |= CMSDK_DUALTIMER2_CTRL_EN_Msk; // enable TIMER2 counter
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NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
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}
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void us_ticker_fire_interrupt(void)
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{
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NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
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NVIC_SetPendingIRQ(US_TICKER_TIMER_IRQn);
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}
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void us_ticker_disable_interrupt(void)
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{
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US_TICKER_TIMER2->TimerControl &= ~CMSDK_DUALTIMER2_CTRL_INTEN_Msk;
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US_TICKER_TIMER2->TimerControl &= ~CMSDK_DUALTIMER2_CTRL_EN_Msk; // disable TIMER2
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NVIC_DisableIRQ(US_TICKER_TIMER_IRQn);
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}
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void us_ticker_clear_interrupt(void)
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{
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US_TICKER_TIMER2->TimerIntClr = CMSDK_DUALTIMER2_INTCLR_Msk;
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}
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const ticker_info_t *us_ticker_get_info(void)
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{
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static const ticker_info_t info = {
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1562500, // 4 stages prescaled from 25MHz (dived by 16)
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32 // 32 bit counter
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};
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return &info;
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}
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