mirror of https://github.com/ARMmbed/mbed-os.git
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015-2016 Nuvoton
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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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#ifndef NU_TIMER_H
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#define NU_TIMER_H
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#include <stdint.h>
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#include <stdbool.h>
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#include "cmsis.h"
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#include "mbed_power_mgmt.h"
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#include "mbed_critical.h"
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#include "ticker_api.h"
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#include "us_ticker_api.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* A simple count-down timer used for Nuvoton ported drivers
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*
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* NOTE: nu_countdown_init must be paired with nu_countdown_free.
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*
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* Example:
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* nu_countdown_ctx_s ctx;
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*
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* // Set up 2 ms timeout
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* nu_countdown_init(&ctx, 2000);
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*
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* // Timed-wait for a task
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* while (true) {
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* // Poll the task
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*
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* if (nu_countdown_expired(&ctx)) {
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* // Timeout
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* }
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* }
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*
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* // Must pair nu_countdown_init with nu_countdown_free in the end
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* nu_countdown_free(&ctx);
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*/
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struct nu_countdown_ctx_s {
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const ticker_data_t * _ticker_data; // Hold ticker_data_t
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us_timestamp_t _interval_end_us; // End of interval in us
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bool _expired; // Expired or not
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};
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__STATIC_INLINE void nu_countdown_init(struct nu_countdown_ctx_s *ctx, us_timestamp_t interval_us)
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{
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core_util_critical_section_enter();
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sleep_manager_lock_deep_sleep();
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ctx->_ticker_data = get_us_ticker_data();
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ctx->_interval_end_us = ticker_read_us(ctx->_ticker_data) + interval_us;
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ctx->_expired = false;
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core_util_critical_section_exit();
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}
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__STATIC_INLINE bool nu_countdown_expired(struct nu_countdown_ctx_s *ctx)
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{
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core_util_critical_section_enter();
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if (! ctx->_expired) {
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ctx->_expired = ticker_read_us(ctx->_ticker_data) >= ctx->_interval_end_us;
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}
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core_util_critical_section_exit();
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return ctx->_expired;
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}
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__STATIC_INLINE void nu_countdown_free(struct nu_countdown_ctx_s *ctx)
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{
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core_util_critical_section_enter();
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sleep_manager_unlock_deep_sleep();
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core_util_critical_section_exit();
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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