mirror of https://github.com/ARMmbed/mbed-os.git
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 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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// This implementation of the wait functions will be compiled only
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// if the RTOS is present.
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#ifdef MBED_CONF_RTOS_PRESENT
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#include "platform/mbed_wait_api.h"
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#include "hal/us_ticker_api.h"
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#include "rtos/rtos.h"
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#include "platform/mbed_critical.h"
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void wait(float s) {
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wait_us(s * 1000000.0f);
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}
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void wait_ms(int ms) {
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wait_us(ms * 1000);
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}
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void wait_us(int us) {
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uint32_t start = us_ticker_read();
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// Use the RTOS to wait for millisecond delays if possible
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int ms = us / 1000;
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if ((ms > 0) && core_util_are_interrupts_enabled()) {
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Thread::wait((uint32_t)ms);
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}
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// Use busy waiting for sub-millisecond delays, or for the whole
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// interval if interrupts are not enabled
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while ((us_ticker_read() - start) < (uint32_t)us);
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}
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#endif // #if MBED_CONF_RTOS_PRESENT
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