wait_api.c

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "wait_api.h"
00017 #include "us_ticker_api.h"
00018 
00019 void wait(float s) {
00020     wait_us(s * 1000000.0f);
00021 }
00022 
00023 void wait_ms(int ms) {
00024     wait_us(ms * 1000);
00025 }
00026 
00027 void wait_us(int us) {
00028     uint32_t start = us_ticker_read();
00029     while ((us_ticker_read() - start) < (uint32_t)us);
00030 }