mirror of https://github.com/ARMmbed/mbed-os.git
113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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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 "platform/mbed_atomic.h"
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#include "hal/us_ticker_api.h"
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#if DEVICE_USTICKER
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static ticker_event_queue_t events = { 0 };
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static ticker_irq_handler_type irq_handler = ticker_irq_handler;
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#if MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
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// If we are initializing at boot, we want the timer to be
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// always-on, so we block any attempt to free it. We do need
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// to pass through init(), as that needs to reset pending
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// interrupts.
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static void block_us_ticker_free()
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{
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}
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#else // MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
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bool _us_ticker_initialized;
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// If we are not initializing at boot, we want to track
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// whether the timer has been initialized. This permits
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// a fast path for wait_us.
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static void note_us_ticker_init()
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{
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us_ticker_init();
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core_util_atomic_store_bool(&_us_ticker_initialized, true);
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}
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static void note_us_ticker_free()
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{
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core_util_atomic_store_bool(&_us_ticker_initialized, false);
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us_ticker_free();
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}
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#endif // MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
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static const ticker_interface_t us_interface = {
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#if MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
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.init = us_ticker_init,
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#else
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.init = note_us_ticker_init,
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#endif
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.read = us_ticker_read,
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.disable_interrupt = us_ticker_disable_interrupt,
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.clear_interrupt = us_ticker_clear_interrupt,
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.set_interrupt = us_ticker_set_interrupt,
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.fire_interrupt = us_ticker_fire_interrupt,
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.get_info = us_ticker_get_info,
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#if MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
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.free = block_us_ticker_free,
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#else
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.free = note_us_ticker_free,
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#endif
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.runs_in_deep_sleep = false,
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};
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static const ticker_data_t us_data = {
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.interface = &us_interface,
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.queue = &events
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};
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const ticker_data_t *get_us_ticker_data(void)
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{
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return &us_data;
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}
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ticker_irq_handler_type set_us_ticker_irq_handler(ticker_irq_handler_type ticker_irq_handler)
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{
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ticker_irq_handler_type prev_irq_handler = irq_handler;
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irq_handler = ticker_irq_handler;
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return prev_irq_handler;
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}
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void us_ticker_irq_handler(void)
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{
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if (irq_handler) {
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irq_handler(&us_data);
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}
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}
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#else
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const ticker_data_t *get_us_ticker_data(void)
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{
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return NULL;
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}
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#endif // DEVICE_USTICKER
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