Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32L1/us_ticker.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2014, STMicroelectronics
elessair 0:f269e3021894 3 * All rights reserved.
elessair 0:f269e3021894 4 *
elessair 0:f269e3021894 5 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 6 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 9 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 11 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 12 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 14 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 15 * without specific prior written permission.
elessair 0:f269e3021894 16 *
elessair 0:f269e3021894 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 27 */
elessair 0:f269e3021894 28 #include <stddef.h>
elessair 0:f269e3021894 29 #include "us_ticker_api.h"
elessair 0:f269e3021894 30 #include "PeripheralNames.h"
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 #define TIM_MST TIM5
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 static TIM_HandleTypeDef TimMasterHandle;
elessair 0:f269e3021894 35 static int us_ticker_inited = 0;
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 void us_ticker_init(void)
elessair 0:f269e3021894 38 {
elessair 0:f269e3021894 39 if (us_ticker_inited) return;
elessair 0:f269e3021894 40 us_ticker_inited = 1;
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 TimMasterHandle.Instance = TIM_MST;
elessair 0:f269e3021894 43
elessair 0:f269e3021894 44 HAL_InitTick(0); // The passed value is not used
elessair 0:f269e3021894 45 }
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 uint32_t us_ticker_read()
elessair 0:f269e3021894 48 {
elessair 0:f269e3021894 49 if (!us_ticker_inited) us_ticker_init();
elessair 0:f269e3021894 50 return TIM_MST->CNT;
elessair 0:f269e3021894 51 }
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 void us_ticker_set_interrupt(timestamp_t timestamp)
elessair 0:f269e3021894 54 {
elessair 0:f269e3021894 55 // Set new output compare value
elessair 0:f269e3021894 56 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
elessair 0:f269e3021894 57 // Enable IT
elessair 0:f269e3021894 58 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
elessair 0:f269e3021894 59 }
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 void us_ticker_disable_interrupt(void)
elessair 0:f269e3021894 62 {
elessair 0:f269e3021894 63 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
elessair 0:f269e3021894 64 }
elessair 0:f269e3021894 65
elessair 0:f269e3021894 66 void us_ticker_clear_interrupt(void)
elessair 0:f269e3021894 67 {
elessair 0:f269e3021894 68 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
elessair 0:f269e3021894 69 }