mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_STM/us_ticker.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
Child:
187:0387e8f68319
mbed-dev library. Release version 162

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /* mbed Microcontroller Library
Anna Bridge 186:707f6e361f3e 2 * Copyright (c) 2006-2016 ARM Limited
Anna Bridge 186:707f6e361f3e 3 *
Anna Bridge 186:707f6e361f3e 4 * Licensed under the Apache License, Version 2.0 (the "License");
Anna Bridge 186:707f6e361f3e 5 * you may not use this file except in compliance with the License.
Anna Bridge 186:707f6e361f3e 6 * You may obtain a copy of the License at
Anna Bridge 186:707f6e361f3e 7 *
Anna Bridge 186:707f6e361f3e 8 * http://www.apache.org/licenses/LICENSE-2.0
Anna Bridge 186:707f6e361f3e 9 *
Anna Bridge 186:707f6e361f3e 10 * Unless required by applicable law or agreed to in writing, software
Anna Bridge 186:707f6e361f3e 11 * distributed under the License is distributed on an "AS IS" BASIS,
Anna Bridge 186:707f6e361f3e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Anna Bridge 186:707f6e361f3e 13 * See the License for the specific language governing permissions and
Anna Bridge 186:707f6e361f3e 14 * limitations under the License.
Anna Bridge 186:707f6e361f3e 15 */
Anna Bridge 186:707f6e361f3e 16 #include <stddef.h>
Anna Bridge 186:707f6e361f3e 17 #include "us_ticker_api.h"
Anna Bridge 186:707f6e361f3e 18 #include "PeripheralNames.h"
Anna Bridge 186:707f6e361f3e 19 #include "hal_tick.h"
Anna Bridge 186:707f6e361f3e 20
Anna Bridge 186:707f6e361f3e 21 #if TIM_MST_16BIT
Anna Bridge 186:707f6e361f3e 22 #define TIMER_TICKER_BIT_WIDTH 16
Anna Bridge 186:707f6e361f3e 23 #else
Anna Bridge 186:707f6e361f3e 24 #define TIMER_TICKER_BIT_WIDTH 32
Anna Bridge 186:707f6e361f3e 25 #endif
Anna Bridge 186:707f6e361f3e 26
Anna Bridge 186:707f6e361f3e 27 TIM_HandleTypeDef TimMasterHandle;
Anna Bridge 186:707f6e361f3e 28
Anna Bridge 186:707f6e361f3e 29 const ticker_info_t* us_ticker_get_info()
Anna Bridge 186:707f6e361f3e 30 {
Anna Bridge 186:707f6e361f3e 31 static const ticker_info_t info = {
Anna Bridge 186:707f6e361f3e 32 1000000,
Anna Bridge 186:707f6e361f3e 33 TIMER_TICKER_BIT_WIDTH
Anna Bridge 186:707f6e361f3e 34 };
Anna Bridge 186:707f6e361f3e 35 return &info;
Anna Bridge 186:707f6e361f3e 36 }
Anna Bridge 186:707f6e361f3e 37
Anna Bridge 186:707f6e361f3e 38 void us_ticker_init(void)
Anna Bridge 186:707f6e361f3e 39 {
Anna Bridge 186:707f6e361f3e 40 /* NOTE: assuming that HAL tick has already been initialized! */
Anna Bridge 186:707f6e361f3e 41 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
Anna Bridge 186:707f6e361f3e 42 }
Anna Bridge 186:707f6e361f3e 43
Anna Bridge 186:707f6e361f3e 44 uint32_t us_ticker_read()
Anna Bridge 186:707f6e361f3e 45 {
Anna Bridge 186:707f6e361f3e 46 return TIM_MST->CNT;
Anna Bridge 186:707f6e361f3e 47 }
Anna Bridge 186:707f6e361f3e 48
Anna Bridge 186:707f6e361f3e 49 void us_ticker_set_interrupt(timestamp_t timestamp)
Anna Bridge 186:707f6e361f3e 50 {
Anna Bridge 186:707f6e361f3e 51 // NOTE: This function must be called with interrupts disabled to keep our
Anna Bridge 186:707f6e361f3e 52 // timer interrupt setup atomic
Anna Bridge 186:707f6e361f3e 53 // Set new output compare value
Anna Bridge 186:707f6e361f3e 54 __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
Anna Bridge 186:707f6e361f3e 55 // Ensure the compare event starts clear
Anna Bridge 186:707f6e361f3e 56 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
Anna Bridge 186:707f6e361f3e 57 // Enable IT
Anna Bridge 186:707f6e361f3e 58 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
Anna Bridge 186:707f6e361f3e 59 }
Anna Bridge 186:707f6e361f3e 60
Anna Bridge 186:707f6e361f3e 61 void us_ticker_fire_interrupt(void)
Anna Bridge 186:707f6e361f3e 62 {
Anna Bridge 186:707f6e361f3e 63 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
Anna Bridge 186:707f6e361f3e 64 LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
Anna Bridge 186:707f6e361f3e 65 // Enable IT
Anna Bridge 186:707f6e361f3e 66 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
Anna Bridge 186:707f6e361f3e 67 }
Anna Bridge 186:707f6e361f3e 68
Anna Bridge 186:707f6e361f3e 69 /* NOTE: must be called with interrupts disabled! */
Anna Bridge 186:707f6e361f3e 70 void us_ticker_disable_interrupt(void)
Anna Bridge 186:707f6e361f3e 71 {
Anna Bridge 186:707f6e361f3e 72 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
Anna Bridge 186:707f6e361f3e 73 }
Anna Bridge 186:707f6e361f3e 74
Anna Bridge 186:707f6e361f3e 75 /* NOTE: must be called with interrupts disabled! */
Anna Bridge 186:707f6e361f3e 76 void us_ticker_clear_interrupt(void)
Anna Bridge 186:707f6e361f3e 77 {
Anna Bridge 186:707f6e361f3e 78 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
Anna Bridge 186:707f6e361f3e 79 }
Anna Bridge 186:707f6e361f3e 80