tmk_core/tool/mbed/mbed-sdk/libraries/mbed/common/wait_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "wait_api.h"
  17 #include "us_ticker_api.h"
  18
  19 void wait(float s) {
  20     wait_us(s * 1000000.0f);
  21 }
  22
  23 void wait_ms(int ms) {
  24     wait_us(ms * 1000);
  25 }
  26
  27 void wait_us(int us) {
  28     uint32_t start = us_ticker_read();
  29     while ((us_ticker_read() - start) < (uint32_t)us);
  30 }