mbed
Fork of mbed-dev by
targets/TARGET_NUVOTON/nu_timer.h
- Committer:
- Anna Bridge
- Date:
- 2018-01-17
- Revision:
- 181:96ed750bd169
File content as of revision 181:96ed750bd169:
/* mbed Microcontroller Library * Copyright (c) 2015-2016 Nuvoton * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef NU_TIMER_H #define NU_TIMER_H #include <stdint.h> #include <stdbool.h> #include "cmsis.h" #include "mbed_sleep.h" #include "mbed_critical.h" #include "ticker_api.h" #include "us_ticker_api.h" #ifdef __cplusplus extern "C" { #endif /* A simple count-down timer used for Nuvoton ported drivers * * NOTE: nu_countdown_init must be paired with nu_countdown_free. * * Example: * nu_countdown_ctx_s ctx; * * // Set up 2 ms timeout * nu_countdown_init(&ctx, 2000); * * // Timed-wait for a task * while (true) { * // Poll the task * * if (nu_countdown_expired(&ctx)) { * // Timeout * } * } * * // Must pair nu_countdown_init with nu_countdown_free in the end * nu_countdown_free(&ctx); */ struct nu_countdown_ctx_s { const ticker_data_t * _ticker_data; // Hold ticker_data_t us_timestamp_t _interval_end_us; // End of interval in us bool _expired; // Expired or not }; __STATIC_INLINE void nu_countdown_init(struct nu_countdown_ctx_s *ctx, us_timestamp_t interval_us) { core_util_critical_section_enter(); sleep_manager_lock_deep_sleep(); ctx->_ticker_data = get_us_ticker_data(); ctx->_interval_end_us = ticker_read_us(ctx->_ticker_data) + interval_us; ctx->_expired = false; core_util_critical_section_exit(); } __STATIC_INLINE bool nu_countdown_expired(struct nu_countdown_ctx_s *ctx) { core_util_critical_section_enter(); if (! ctx->_expired) { ctx->_expired = ticker_read_us(ctx->_ticker_data) >= ctx->_interval_end_us; } core_util_critical_section_exit(); return ctx->_expired; } __STATIC_INLINE void nu_countdown_free(struct nu_countdown_ctx_s *ctx) { core_util_critical_section_enter(); sleep_manager_unlock_deep_sleep(); core_util_critical_section_exit(); } #ifdef __cplusplus } #endif #endif