Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

platform/mbed_wait_api_rtos.cpp@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16
elessair 0:f269e3021894 17 // This implementation of the wait functions will be compiled only
elessair 0:f269e3021894 18 // if the RTOS is present.
elessair 0:f269e3021894 19 #ifdef MBED_CONF_RTOS_PRESENT
elessair 0:f269e3021894 20
elessair 0:f269e3021894 21 #include "platform/wait_api.h"
elessair 0:f269e3021894 22 #include "hal/us_ticker_api.h"
elessair 0:f269e3021894 23 #include "rtos/rtos.h"
elessair 0:f269e3021894 24 #include "platform/critical.h"
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 void wait(float s) {
elessair 0:f269e3021894 27 wait_us(s * 1000000.0f);
elessair 0:f269e3021894 28 }
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 void wait_ms(int ms) {
elessair 0:f269e3021894 31 wait_us(ms * 1000);
elessair 0:f269e3021894 32 }
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 void wait_us(int us) {
elessair 0:f269e3021894 35 uint32_t start = us_ticker_read();
elessair 0:f269e3021894 36 // Use the RTOS to wait for millisecond delays if possible
elessair 0:f269e3021894 37 int ms = us / 1000;
elessair 0:f269e3021894 38 if ((ms > 0) && core_util_are_interrupts_enabled()) {
elessair 0:f269e3021894 39 Thread::wait((uint32_t)ms);
elessair 0:f269e3021894 40 us -= ms * 1000;
elessair 0:f269e3021894 41 }
elessair 0:f269e3021894 42 // Use busy waiting for sub-millisecond delays, or for the whole
elessair 0:f269e3021894 43 // interval if interrupts are not enabled
elessair 0:f269e3021894 44 if (us > 0) {
elessair 0:f269e3021894 45 while((us_ticker_read() - start) < (uint32_t)us);
elessair 0:f269e3021894 46 }
elessair 0:f269e3021894 47 }
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 #endif // #if MBED_CONF_RTOS_PRESENT
elessair 0:f269e3021894 50