mirror of https://github.com/ARMmbed/mbed-os.git
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2018 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "hal/us_ticker_api.h"
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#include "us_ticker_data.h"
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// This variable is set to 1 at the of mbed_sdk_init function.
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// The ticker_read_us function must not be called until the mbed_sdk_init is terminated.
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extern int mbed_sdk_inited;
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// Defined in us_ticker.c
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void init_16bit_timer(void);
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void init_32bit_timer(void);
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#if TIM_MST_BIT_WIDTH == 16
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// Variables also reset in us_ticker_init()
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uint32_t prev_time = 0;
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uint32_t elapsed_time = 0;
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#endif
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// Overwrite default HAL functions defined as "weak"
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HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
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{
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#if TIM_MST_BIT_WIDTH == 16
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init_16bit_timer();
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#else
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init_32bit_timer();
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#endif
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return HAL_OK;
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}
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uint32_t HAL_GetTick()
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{
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#if TIM_MST_BIT_WIDTH == 16
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uint32_t new_time;
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if (mbed_sdk_inited) {
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// Apply the latest time recorded just before the sdk is inited
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new_time = ticker_read_us(get_us_ticker_data()) + prev_time;
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prev_time = 0; // Use this time only once
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return (new_time / 1000);
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}
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else {
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new_time = us_ticker_read();
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elapsed_time += (new_time - prev_time) & 0xFFFF; // Only use the lower 16 bits
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prev_time = new_time;
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return (elapsed_time / 1000);
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}
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#else // 32-bit timer
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if (mbed_sdk_inited) {
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return (ticker_read_us(get_us_ticker_data()) / 1000);
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}
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else {
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return (us_ticker_read() / 1000);
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}
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#endif
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}
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void HAL_SuspendTick(void)
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{
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// Do nothing
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}
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void HAL_ResumeTick(void)
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{
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// Do nothing
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}
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