Gan likun / mbed1-dev

001

targets/TARGET_STM/us_ticker_32b.c@0:13413ea9a877, 2022-06-12 (annotated)

Committer:
ganlikun
Date:
Sun Jun 12 14:02:44 2022 +0000
Revision:
0:13413ea9a877
00

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ganlikun 0:13413ea9a877 1 /* mbed Microcontroller Library
ganlikun 0:13413ea9a877 2 * Copyright (c) 2006-2016 ARM Limited
ganlikun 0:13413ea9a877 3 *
ganlikun 0:13413ea9a877 4 * Licensed under the Apache License, Version 2.0 (the "License");
ganlikun 0:13413ea9a877 5 * you may not use this file except in compliance with the License.
ganlikun 0:13413ea9a877 6 * You may obtain a copy of the License at
ganlikun 0:13413ea9a877 7 *
ganlikun 0:13413ea9a877 8 * http://www.apache.org/licenses/LICENSE-2.0
ganlikun 0:13413ea9a877 9 *
ganlikun 0:13413ea9a877 10 * Unless required by applicable law or agreed to in writing, software
ganlikun 0:13413ea9a877 11 * distributed under the License is distributed on an "AS IS" BASIS,
ganlikun 0:13413ea9a877 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ganlikun 0:13413ea9a877 13 * See the License for the specific language governing permissions and
ganlikun 0:13413ea9a877 14 * limitations under the License.
ganlikun 0:13413ea9a877 15 */
ganlikun 0:13413ea9a877 16 #include <stddef.h>
ganlikun 0:13413ea9a877 17 #include "us_ticker_api.h"
ganlikun 0:13413ea9a877 18 #include "PeripheralNames.h"
ganlikun 0:13413ea9a877 19 #include "hal_tick.h"
ganlikun 0:13413ea9a877 20
ganlikun 0:13413ea9a877 21 // A 32-bit timer is used
ganlikun 0:13413ea9a877 22 #if !TIM_MST_16BIT
ganlikun 0:13413ea9a877 23
ganlikun 0:13413ea9a877 24 TIM_HandleTypeDef TimMasterHandle;
ganlikun 0:13413ea9a877 25
ganlikun 0:13413ea9a877 26 void us_ticker_init(void)
ganlikun 0:13413ea9a877 27 {
ganlikun 0:13413ea9a877 28 /* NOTE: assuming that HAL tick has already been initialized! */
ganlikun 0:13413ea9a877 29 }
ganlikun 0:13413ea9a877 30
ganlikun 0:13413ea9a877 31 uint32_t us_ticker_read()
ganlikun 0:13413ea9a877 32 {
ganlikun 0:13413ea9a877 33 return TIM_MST->CNT;
ganlikun 0:13413ea9a877 34 }
ganlikun 0:13413ea9a877 35
ganlikun 0:13413ea9a877 36 void us_ticker_set_interrupt(timestamp_t timestamp)
ganlikun 0:13413ea9a877 37 {
ganlikun 0:13413ea9a877 38 // NOTE: This function must be called with interrupts disabled to keep our
ganlikun 0:13413ea9a877 39 // timer interrupt setup atomic
ganlikun 0:13413ea9a877 40
ganlikun 0:13413ea9a877 41 // disable IT while we are handling the correct timestamp
ganlikun 0:13413ea9a877 42 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
ganlikun 0:13413ea9a877 43 // Set new output compare value
ganlikun 0:13413ea9a877 44 __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
ganlikun 0:13413ea9a877 45 // Enable IT
ganlikun 0:13413ea9a877 46 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
ganlikun 0:13413ea9a877 47 }
ganlikun 0:13413ea9a877 48
ganlikun 0:13413ea9a877 49 void us_ticker_fire_interrupt(void)
ganlikun 0:13413ea9a877 50 {
ganlikun 0:13413ea9a877 51 LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
ganlikun 0:13413ea9a877 52 }
ganlikun 0:13413ea9a877 53
ganlikun 0:13413ea9a877 54 /* NOTE: must be called with interrupts disabled! */
ganlikun 0:13413ea9a877 55 void us_ticker_disable_interrupt(void)
ganlikun 0:13413ea9a877 56 {
ganlikun 0:13413ea9a877 57 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
ganlikun 0:13413ea9a877 58 }
ganlikun 0:13413ea9a877 59
ganlikun 0:13413ea9a877 60 /* NOTE: must be called with interrupts disabled! */
ganlikun 0:13413ea9a877 61 void us_ticker_clear_interrupt(void)
ganlikun 0:13413ea9a877 62 {
ganlikun 0:13413ea9a877 63 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
ganlikun 0:13413ea9a877 64 }
ganlikun 0:13413ea9a877 65
ganlikun 0:13413ea9a877 66 #endif // !TIM_MST_16BIT
ganlikun 0:13413ea9a877 67