b luo / mbed-dev

mbed library sources. With a patch for the can_api

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L4/us_ticker.c@151:91825d030f9b, 2016-11-14 (annotated)

Committer:
DangerousElectrician
Date:
Mon Nov 14 04:39:23 2016 +0000
Revision:
151:91825d030f9b
Parent:
149:156823d33999 
stuff changed?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015, STMicroelectronics
<> 144:ef7eb2e8f9f7 3 * All rights reserved.
<> 144:ef7eb2e8f9f7 4 *
<> 144:ef7eb2e8f9f7 5 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 6 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 9 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 11 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 12 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 14 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 15 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 16 *
<> 144:ef7eb2e8f9f7 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 27 */
<> 144:ef7eb2e8f9f7 28 #include <stddef.h>
<> 144:ef7eb2e8f9f7 29 #include "us_ticker_api.h"
<> 144:ef7eb2e8f9f7 30 #include "PeripheralNames.h"
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 #if defined(TIM5_BASE)
<> 144:ef7eb2e8f9f7 33 #define TIM_MST TIM5
<> 144:ef7eb2e8f9f7 34 #else
<> 144:ef7eb2e8f9f7 35 #define TIM_MST TIM2
<> 144:ef7eb2e8f9f7 36 #endif
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 static TIM_HandleTypeDef TimMasterHandle;
<> 144:ef7eb2e8f9f7 39 static int us_ticker_inited = 0;
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 void us_ticker_init(void)
<> 144:ef7eb2e8f9f7 42 {
<> 144:ef7eb2e8f9f7 43 if (us_ticker_inited) return;
<> 144:ef7eb2e8f9f7 44 us_ticker_inited = 1;
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 TimMasterHandle.Instance = TIM_MST;
<> 144:ef7eb2e8f9f7 47
<> 144:ef7eb2e8f9f7 48 HAL_InitTick(0); // The passed value is not used
<> 144:ef7eb2e8f9f7 49 }
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 uint32_t us_ticker_read()
<> 144:ef7eb2e8f9f7 52 {
<> 144:ef7eb2e8f9f7 53 if (!us_ticker_inited) us_ticker_init();
<> 144:ef7eb2e8f9f7 54 return TIM_MST->CNT;
<> 144:ef7eb2e8f9f7 55 }
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 void us_ticker_set_interrupt(timestamp_t timestamp)
<> 144:ef7eb2e8f9f7 58 {
<> 144:ef7eb2e8f9f7 59 // Set new output compare value
<> 144:ef7eb2e8f9f7 60 __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
<> 144:ef7eb2e8f9f7 61 // Enable IT
<> 144:ef7eb2e8f9f7 62 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
<> 144:ef7eb2e8f9f7 63 }
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 void us_ticker_disable_interrupt(void)
<> 144:ef7eb2e8f9f7 66 {
<> 144:ef7eb2e8f9f7 67 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
<> 144:ef7eb2e8f9f7 68 }
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 void us_ticker_clear_interrupt(void)
<> 144:ef7eb2e8f9f7 71 {
<> 144:ef7eb2e8f9f7 72 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
<> 144:ef7eb2e8f9f7 73 }