/* * Copyright (c) 2014-2018 Cesanta Software Limited * All rights reserved * * Licensed under the Apache License, Version 2.0 (the ""License""); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an ""AS IS"" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#include <math.h>#include "mgos.h"#include "mgos_system.h"void(*mgos_nsleep100)(uint32_tn);uint32_tmgos_nsleep100_loop_count=0;/* Provided by arm_nsleep100_{m4,m7}.S for M4 and M7 respectively. */externvoidmgos_nsleep100_impl(uint32_tn);voidmgos_nsleep100_cal(void){uint32_tcpu_freq=mgos_get_cpu_freq();/* # of instruction cycles per 100 ns */mgos_nsleep100_loop_count=roundf((100.0f/1000000000.0f)/(1.0f/cpu_freq));mgos_nsleep100=mgos_nsleep100_impl;}