Nicolas Borla / Mbed OS BBR_1Ebene

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mbed-os/targets/TARGET_NUVOTON/nu_timer.h@0:fbdae7e6d805, 2018-05-14 (annotated)

Committer:
borlanic
Date:
Mon May 14 11:29:06 2018 +0000
Revision:
0:fbdae7e6d805
BBR

Who changed what in which revision?

UserRevisionLine numberNew contents of line
borlanic 0:fbdae7e6d805 1 /* mbed Microcontroller Library
borlanic 0:fbdae7e6d805 2 * Copyright (c) 2015-2016 Nuvoton
borlanic 0:fbdae7e6d805 3 *
borlanic 0:fbdae7e6d805 4 * Licensed under the Apache License, Version 2.0 (the "License");
borlanic 0:fbdae7e6d805 5 * you may not use this file except in compliance with the License.
borlanic 0:fbdae7e6d805 6 * You may obtain a copy of the License at
borlanic 0:fbdae7e6d805 7 *
borlanic 0:fbdae7e6d805 8 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:fbdae7e6d805 9 *
borlanic 0:fbdae7e6d805 10 * Unless required by applicable law or agreed to in writing, software
borlanic 0:fbdae7e6d805 11 * distributed under the License is distributed on an "AS IS" BASIS,
borlanic 0:fbdae7e6d805 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:fbdae7e6d805 13 * See the License for the specific language governing permissions and
borlanic 0:fbdae7e6d805 14 * limitations under the License.
borlanic 0:fbdae7e6d805 15 */
borlanic 0:fbdae7e6d805 16
borlanic 0:fbdae7e6d805 17 #ifndef NU_TIMER_H
borlanic 0:fbdae7e6d805 18 #define NU_TIMER_H
borlanic 0:fbdae7e6d805 19
borlanic 0:fbdae7e6d805 20 #include <stdint.h>
borlanic 0:fbdae7e6d805 21 #include <stdbool.h>
borlanic 0:fbdae7e6d805 22 #include "cmsis.h"
borlanic 0:fbdae7e6d805 23 #include "mbed_power_mgmt.h"
borlanic 0:fbdae7e6d805 24 #include "mbed_critical.h"
borlanic 0:fbdae7e6d805 25 #include "ticker_api.h"
borlanic 0:fbdae7e6d805 26 #include "us_ticker_api.h"
borlanic 0:fbdae7e6d805 27
borlanic 0:fbdae7e6d805 28 #ifdef __cplusplus
borlanic 0:fbdae7e6d805 29 extern "C" {
borlanic 0:fbdae7e6d805 30 #endif
borlanic 0:fbdae7e6d805 31
borlanic 0:fbdae7e6d805 32 /* A simple count-down timer used for Nuvoton ported drivers
borlanic 0:fbdae7e6d805 33 *
borlanic 0:fbdae7e6d805 34 * NOTE: nu_countdown_init must be paired with nu_countdown_free.
borlanic 0:fbdae7e6d805 35 *
borlanic 0:fbdae7e6d805 36 * Example:
borlanic 0:fbdae7e6d805 37 * nu_countdown_ctx_s ctx;
borlanic 0:fbdae7e6d805 38 *
borlanic 0:fbdae7e6d805 39 * // Set up 2 ms timeout
borlanic 0:fbdae7e6d805 40 * nu_countdown_init(&ctx, 2000);
borlanic 0:fbdae7e6d805 41 *
borlanic 0:fbdae7e6d805 42 * // Timed-wait for a task
borlanic 0:fbdae7e6d805 43 * while (true) {
borlanic 0:fbdae7e6d805 44 * // Poll the task
borlanic 0:fbdae7e6d805 45 *
borlanic 0:fbdae7e6d805 46 * if (nu_countdown_expired(&ctx)) {
borlanic 0:fbdae7e6d805 47 * // Timeout
borlanic 0:fbdae7e6d805 48 * }
borlanic 0:fbdae7e6d805 49 * }
borlanic 0:fbdae7e6d805 50 *
borlanic 0:fbdae7e6d805 51 * // Must pair nu_countdown_init with nu_countdown_free in the end
borlanic 0:fbdae7e6d805 52 * nu_countdown_free(&ctx);
borlanic 0:fbdae7e6d805 53 */
borlanic 0:fbdae7e6d805 54
borlanic 0:fbdae7e6d805 55 struct nu_countdown_ctx_s {
borlanic 0:fbdae7e6d805 56 const ticker_data_t * _ticker_data; // Hold ticker_data_t
borlanic 0:fbdae7e6d805 57 us_timestamp_t _interval_end_us; // End of interval in us
borlanic 0:fbdae7e6d805 58 bool _expired; // Expired or not
borlanic 0:fbdae7e6d805 59 };
borlanic 0:fbdae7e6d805 60
borlanic 0:fbdae7e6d805 61 __STATIC_INLINE void nu_countdown_init(struct nu_countdown_ctx_s *ctx, us_timestamp_t interval_us)
borlanic 0:fbdae7e6d805 62 {
borlanic 0:fbdae7e6d805 63 core_util_critical_section_enter();
borlanic 0:fbdae7e6d805 64 sleep_manager_lock_deep_sleep();
borlanic 0:fbdae7e6d805 65 ctx->_ticker_data = get_us_ticker_data();
borlanic 0:fbdae7e6d805 66 ctx->_interval_end_us = ticker_read_us(ctx->_ticker_data) + interval_us;
borlanic 0:fbdae7e6d805 67 ctx->_expired = false;
borlanic 0:fbdae7e6d805 68 core_util_critical_section_exit();
borlanic 0:fbdae7e6d805 69 }
borlanic 0:fbdae7e6d805 70
borlanic 0:fbdae7e6d805 71 __STATIC_INLINE bool nu_countdown_expired(struct nu_countdown_ctx_s *ctx)
borlanic 0:fbdae7e6d805 72 {
borlanic 0:fbdae7e6d805 73 core_util_critical_section_enter();
borlanic 0:fbdae7e6d805 74 if (! ctx->_expired) {
borlanic 0:fbdae7e6d805 75 ctx->_expired = ticker_read_us(ctx->_ticker_data) >= ctx->_interval_end_us;
borlanic 0:fbdae7e6d805 76 }
borlanic 0:fbdae7e6d805 77 core_util_critical_section_exit();
borlanic 0:fbdae7e6d805 78
borlanic 0:fbdae7e6d805 79 return ctx->_expired;
borlanic 0:fbdae7e6d805 80 }
borlanic 0:fbdae7e6d805 81
borlanic 0:fbdae7e6d805 82 __STATIC_INLINE void nu_countdown_free(struct nu_countdown_ctx_s *ctx)
borlanic 0:fbdae7e6d805 83 {
borlanic 0:fbdae7e6d805 84 core_util_critical_section_enter();
borlanic 0:fbdae7e6d805 85 sleep_manager_unlock_deep_sleep();
borlanic 0:fbdae7e6d805 86 core_util_critical_section_exit();
borlanic 0:fbdae7e6d805 87 }
borlanic 0:fbdae7e6d805 88
borlanic 0:fbdae7e6d805 89 #ifdef __cplusplus
borlanic 0:fbdae7e6d805 90 }
borlanic 0:fbdae7e6d805 91 #endif
borlanic 0:fbdae7e6d805 92
borlanic 0:fbdae7e6d805 93 #endif