mirror of https://github.com/ARMmbed/mbed-os.git
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2016 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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#include "hal_tick.h"
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#if TIM_MST_16BIT
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#define TIMER_TICKER_BIT_WIDTH 16
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#else
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#define TIMER_TICKER_BIT_WIDTH 32
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#endif
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TIM_HandleTypeDef TimMasterHandle;
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const ticker_info_t* us_ticker_get_info()
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{
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static const ticker_info_t info = {
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1000000,
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TIMER_TICKER_BIT_WIDTH
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};
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return &info;
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}
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void us_ticker_init(void)
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{
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/* NOTE: assuming that HAL tick has already been initialized! */
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__HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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uint32_t us_ticker_read()
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{
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return TIM_MST->CNT;
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}
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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// NOTE: This function must be called with interrupts disabled to keep our
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// timer interrupt setup atomic
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// Set new output compare value
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__HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
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// Ensure the compare event starts clear
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__HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
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// Enable IT
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__HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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void us_ticker_fire_interrupt(void)
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{
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__HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
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LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
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// Enable IT
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__HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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/* NOTE: must be called with interrupts disabled! */
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void us_ticker_disable_interrupt(void)
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{
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__HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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/* NOTE: must be called with interrupts disabled! */
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void us_ticker_clear_interrupt(void)
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{
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__HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
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}
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