platform/mbed_wait_api_rtos.cpp@0:0e018d759a2a, 2016-11-08 (annotated)
- Committer:
- switches
- Date:
- Tue Nov 08 18:27:11 2016 +0000
- Revision:
- 0:0e018d759a2a
Initial commit
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| switches | 0:0e018d759a2a | 1 | /* mbed Microcontroller Library |
| switches | 0:0e018d759a2a | 2 | * Copyright (c) 2006-2013 ARM Limited |
| switches | 0:0e018d759a2a | 3 | * |
| switches | 0:0e018d759a2a | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| switches | 0:0e018d759a2a | 5 | * you may not use this file except in compliance with the License. |
| switches | 0:0e018d759a2a | 6 | * You may obtain a copy of the License at |
| switches | 0:0e018d759a2a | 7 | * |
| switches | 0:0e018d759a2a | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| switches | 0:0e018d759a2a | 9 | * |
| switches | 0:0e018d759a2a | 10 | * Unless required by applicable law or agreed to in writing, software |
| switches | 0:0e018d759a2a | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| switches | 0:0e018d759a2a | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| switches | 0:0e018d759a2a | 13 | * See the License for the specific language governing permissions and |
| switches | 0:0e018d759a2a | 14 | * limitations under the License. |
| switches | 0:0e018d759a2a | 15 | */ |
| switches | 0:0e018d759a2a | 16 | |
| switches | 0:0e018d759a2a | 17 | // This implementation of the wait functions will be compiled only |
| switches | 0:0e018d759a2a | 18 | // if the RTOS is present. |
| switches | 0:0e018d759a2a | 19 | #ifdef MBED_CONF_RTOS_PRESENT |
| switches | 0:0e018d759a2a | 20 | |
| switches | 0:0e018d759a2a | 21 | #include "platform/wait_api.h" |
| switches | 0:0e018d759a2a | 22 | #include "hal/us_ticker_api.h" |
| switches | 0:0e018d759a2a | 23 | #include "rtos/rtos.h" |
| switches | 0:0e018d759a2a | 24 | #include "platform/critical.h" |
| switches | 0:0e018d759a2a | 25 | |
| switches | 0:0e018d759a2a | 26 | void wait(float s) { |
| switches | 0:0e018d759a2a | 27 | wait_us(s * 1000000.0f); |
| switches | 0:0e018d759a2a | 28 | } |
| switches | 0:0e018d759a2a | 29 | |
| switches | 0:0e018d759a2a | 30 | void wait_ms(int ms) { |
| switches | 0:0e018d759a2a | 31 | wait_us(ms * 1000); |
| switches | 0:0e018d759a2a | 32 | } |
| switches | 0:0e018d759a2a | 33 | |
| switches | 0:0e018d759a2a | 34 | void wait_us(int us) { |
| switches | 0:0e018d759a2a | 35 | uint32_t start = us_ticker_read(); |
| switches | 0:0e018d759a2a | 36 | // Use the RTOS to wait for millisecond delays if possible |
| switches | 0:0e018d759a2a | 37 | int ms = us / 1000; |
| switches | 0:0e018d759a2a | 38 | if ((ms > 0) && core_util_are_interrupts_enabled()) { |
| switches | 0:0e018d759a2a | 39 | Thread::wait((uint32_t)ms); |
| switches | 0:0e018d759a2a | 40 | us -= ms * 1000; |
| switches | 0:0e018d759a2a | 41 | } |
| switches | 0:0e018d759a2a | 42 | // Use busy waiting for sub-millisecond delays, or for the whole |
| switches | 0:0e018d759a2a | 43 | // interval if interrupts are not enabled |
| switches | 0:0e018d759a2a | 44 | if (us > 0) { |
| switches | 0:0e018d759a2a | 45 | while((us_ticker_read() - start) < (uint32_t)us); |
| switches | 0:0e018d759a2a | 46 | } |
| switches | 0:0e018d759a2a | 47 | } |
| switches | 0:0e018d759a2a | 48 | |
| switches | 0:0e018d759a2a | 49 | #endif // #if MBED_CONF_RTOS_PRESENT |
| switches | 0:0e018d759a2a | 50 |